Mercurial > hg
annotate mercurial/help/internals/wireprotocol.txt @ 37060:0a6c5cc09a88
wireproto: define human output side channel frame
Currently, the SSH protocol delivers output tailored for people over
the stderr file descriptor. The HTTP protocol doesn't have this
file descriptor (because it only has an input and output pipe). So
it encodes textual output intended for humans within the protocol
responses. So response types have a facility for capturing output
to be printed to users. Some don't. And sometimes the implementation
of how that output is conveyed is super hacky.
On top of that, bundle2 has an "output" part that is used to store
output that should be printed when this part is encountered.
bundle2 also has the concept of "interrupt" chunks, which can be
used to signal that the regular bundle2 stream is to be
preempted by an out-of-band part that should be processed immediately.
This "interrupt" part can be an "output" part and can be used to
print data on the receiver.
The status quo is inconsistent and insane. We can do better.
This commit introduces a dedicated frame type on the frame-based
protocol for denoting textual data that should be printed on the
receiver. This frame type effectively constitutes a side-channel
by which textual data can be printed on the receiver without
interfering with other in-progress transmissions, such as the
transmission of command responses.
But wait - there's more! Previous implementations that transferred
textual data basically instructed the client to "print these bytes."
This suffered from a few problems.
First, the text data that was transmitted and eventually printed
originated from a server with a specic i18n configuration. This
meant that clients would see text using whatever the i18n settings
were on the server. Someone in France could connect to a server in
Japan and see unlegible Japanese glyphs - or maybe even mojibake.
Second, the normalization of all text data originated on servers
resulted in the loss of the ability to apply formatting to that
data. Local Mercurial clients can apply specific formatting
settings to individual atoms of text. For example, a revision can
be colored differently from a commit message. With data over the
wire, the potential for this rich formatting was lost. The best you
could do (without parsing the text to be printed), was apply a
universal label to it and e.g. color it specially.
The new mechanism for instructing the peer to print data does
not have these limitations.
Frames instructing the peer to print text are composed of a
formatting string plus arguments. In other words, receivers can
plug the formatting string into the i18n database to see if a local
translation is available. In addition, each atom being instructed
to print has a series of "labels" associated with it. These labels
can be mapped to the Mercurial UI's labels so locally configured
coloring, styling, etc settings can be applied.
What this all means is that textual messages originating on servers
can be localized on the client and richly formatted, all while
respecting the client's settings. This is slightly more complicated
than "print these bytes." But it is vastly more user friendly.
FWIW, I'm not aware of other protocols that attempt to encode
i18n and textual styling in this manner. You could lobby the
claim that this feature is over-engineered. However, if I were to
sit in the shoes of a non-English speaker learning how to use
version control, I think I would *love* this feature because
it would enable me to see richly formatted text in my chosen
locale.
Anyway, we only implement support for encoding frames of this
type and basic tests for that encoding. We'll still need to
hook up the server and its ui instance to emit these frames.
I recognize this feature may be a bit more controversial than
other aspects of the wire protocol because it is a bit
"radical." So I'd figured I'd start small to test the waters and
see if others feel this feature is worthwhile.
Differential Revision: https://phab.mercurial-scm.org/D2872
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Wed, 14 Mar 2018 22:19:00 -0700 |
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1 The Mercurial wire protocol is a request-response based protocol |
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2 with multiple wire representations. |
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3 |
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4 Each request is modeled as a command name, a dictionary of arguments, and |
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5 optional raw input. Command arguments and their types are intrinsic |
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6 properties of commands. So is the response type of the command. This means |
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7 clients can't always send arbitrary arguments to servers and servers can't |
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8 return multiple response types. |
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9 |
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10 The protocol is synchronous and does not support multiplexing (concurrent |
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11 commands). |
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12 |
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13 Handshake |
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14 ========= |
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15 |
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16 It is required or common for clients to perform a *handshake* when connecting |
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17 to a server. The handshake serves the following purposes: |
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18 |
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19 * Negotiating protocol/transport level options |
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20 * Allows the client to learn about server capabilities to influence |
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21 future requests |
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22 * Ensures the underlying transport channel is in a *clean* state |
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23 |
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24 An important goal of the handshake is to allow clients to use more modern |
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25 wire protocol features. By default, clients must assume they are talking |
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26 to an old version of Mercurial server (possibly even the very first |
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27 implementation). So, clients should not attempt to call or utilize modern |
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28 wire protocol features until they have confirmation that the server |
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29 supports them. The handshake implementation is designed to allow both |
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30 ends to utilize the latest set of features and capabilities with as |
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31 few round trips as possible. |
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32 |
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33 The handshake mechanism varies by transport and protocol and is documented |
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34 in the sections below. |
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35 |
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36 HTTP Protocol |
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37 ============= |
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38 |
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39 Handshake |
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40 --------- |
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41 |
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42 The client sends a ``capabilities`` command request (``?cmd=capabilities``) |
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43 as soon as HTTP requests may be issued. |
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44 |
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45 The server responds with a capabilities string, which the client parses to |
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46 learn about the server's abilities. |
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47 |
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48 HTTP Version 1 Transport |
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49 ------------------------ |
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50 |
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51 Commands are issued as HTTP/1.0 or HTTP/1.1 requests. Commands are |
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52 sent to the base URL of the repository with the command name sent in |
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53 the ``cmd`` query string parameter. e.g. |
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54 ``https://example.com/repo?cmd=capabilities``. The HTTP method is ``GET`` |
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55 or ``POST`` depending on the command and whether there is a request |
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56 body. |
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57 |
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58 Command arguments can be sent multiple ways. |
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59 |
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60 The simplest is part of the URL query string using ``x-www-form-urlencoded`` |
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61 encoding (see Python's ``urllib.urlencode()``. However, many servers impose |
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62 length limitations on the URL. So this mechanism is typically only used if |
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63 the server doesn't support other mechanisms. |
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64 |
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65 If the server supports the ``httpheader`` capability, command arguments can |
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66 be sent in HTTP request headers named ``X-HgArg-<N>`` where ``<N>`` is an |
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67 integer starting at 1. A ``x-www-form-urlencoded`` representation of the |
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68 arguments is obtained. This full string is then split into chunks and sent |
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69 in numbered ``X-HgArg-<N>`` headers. The maximum length of each HTTP header |
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70 is defined by the server in the ``httpheader`` capability value, which defaults |
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71 to ``1024``. The server reassembles the encoded arguments string by |
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72 concatenating the ``X-HgArg-<N>`` headers then URL decodes them into a |
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73 dictionary. |
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74 |
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75 The list of ``X-HgArg-<N>`` headers should be added to the ``Vary`` request |
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76 header to instruct caches to take these headers into consideration when caching |
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77 requests. |
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78 |
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79 If the server supports the ``httppostargs`` capability, the client |
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80 may send command arguments in the HTTP request body as part of an |
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81 HTTP POST request. The command arguments will be URL encoded just like |
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82 they would for sending them via HTTP headers. However, no splitting is |
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83 performed: the raw arguments are included in the HTTP request body. |
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84 |
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85 The client sends a ``X-HgArgs-Post`` header with the string length of the |
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86 encoded arguments data. Additional data may be included in the HTTP |
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87 request body immediately following the argument data. The offset of the |
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88 non-argument data is defined by the ``X-HgArgs-Post`` header. The |
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89 ``X-HgArgs-Post`` header is not required if there is no argument data. |
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90 |
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91 Additional command data can be sent as part of the HTTP request body. The |
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92 default ``Content-Type`` when sending data is ``application/mercurial-0.1``. |
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93 A ``Content-Length`` header is currently always sent. |
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94 |
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95 Example HTTP requests:: |
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96 |
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97 GET /repo?cmd=capabilities |
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98 X-HgArg-1: foo=bar&baz=hello%20world |
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99 |
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100 The request media type should be chosen based on server support. If the |
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101 ``httpmediatype`` server capability is present, the client should send |
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102 the newest mutually supported media type. If this capability is absent, |
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103 the client must assume the server only supports the |
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104 ``application/mercurial-0.1`` media type. |
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105 |
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106 The ``Content-Type`` HTTP response header identifies the response as coming |
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107 from Mercurial and can also be used to signal an error has occurred. |
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108 |
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109 The ``application/mercurial-*`` media types indicate a generic Mercurial |
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110 data type. |
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111 |
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112 The ``application/mercurial-0.1`` media type is raw Mercurial data. It is the |
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113 predecessor of the format below. |
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114 |
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115 The ``application/mercurial-0.2`` media type is compression framed Mercurial |
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116 data. The first byte of the payload indicates the length of the compression |
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117 format identifier that follows. Next are N bytes indicating the compression |
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118 format. e.g. ``zlib``. The remaining bytes are compressed according to that |
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119 compression format. The decompressed data behaves the same as with |
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120 ``application/mercurial-0.1``. |
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121 |
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122 The ``application/hg-error`` media type indicates a generic error occurred. |
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123 The content of the HTTP response body typically holds text describing the |
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124 error. |
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125 |
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126 The ``application/hg-changegroup`` media type indicates a changegroup response |
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127 type. |
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128 |
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129 Clients also accept the ``text/plain`` media type. All other media |
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130 types should cause the client to error. |
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131 |
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132 Behavior of media types is further described in the ``Content Negotiation`` |
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133 section below. |
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134 |
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135 Clients should issue a ``User-Agent`` request header that identifies the client. |
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136 The server should not use the ``User-Agent`` for feature detection. |
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137 |
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138 A command returning a ``string`` response issues a |
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139 ``application/mercurial-0.*`` media type and the HTTP response body contains |
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140 the raw string value (after compression decoding, if used). A |
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141 ``Content-Length`` header is typically issued, but not required. |
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142 |
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143 A command returning a ``stream`` response issues a |
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144 ``application/mercurial-0.*`` media type and the HTTP response is typically |
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145 using *chunked transfer* (``Transfer-Encoding: chunked``). |
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146 |
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147 HTTP Version 2 Transport |
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148 ------------------------ |
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149 |
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150 **Experimental - feature under active development** |
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151 |
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152 Version 2 of the HTTP protocol is exposed under the ``/api/*`` URL space. |
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153 It's final API name is not yet formalized. |
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154 |
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155 Commands are triggered by sending HTTP POST requests against URLs of the |
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156 form ``<permission>/<command>``, where ``<permission>`` is ``ro`` or |
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157 ``rw``, meaning read-only and read-write, respectively and ``<command>`` |
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158 is a named wire protocol command. |
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159 |
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160 Non-POST request methods MUST be rejected by the server with an HTTP |
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161 405 response. |
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162 |
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163 Commands that modify repository state in meaningful ways MUST NOT be |
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164 exposed under the ``ro`` URL prefix. All available commands MUST be |
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165 available under the ``rw`` URL prefix. |
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166 |
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167 Server adminstrators MAY implement blanket HTTP authentication keyed |
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168 off the URL prefix. For example, a server may require authentication |
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169 for all ``rw/*`` URLs and let unauthenticated requests to ``ro/*`` |
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170 URL proceed. A server MAY issue an HTTP 401, 403, or 407 response |
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171 in accordance with RFC 7235. Clients SHOULD recognize the HTTP Basic |
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172 (RFC 7617) and Digest (RFC 7616) authentication schemes. Clients SHOULD |
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173 make an attempt to recognize unknown schemes using the |
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174 ``WWW-Authenticate`` response header on a 401 response, as defined by |
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175 RFC 7235. |
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176 |
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177 Read-only commands are accessible under ``rw/*`` URLs so clients can |
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178 signal the intent of the operation very early in the connection |
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179 lifecycle. For example, a ``push`` operation - which consists of |
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180 various read-only commands mixed with at least one read-write command - |
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181 can perform all commands against ``rw/*`` URLs so that any server-side |
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182 authentication requirements are discovered upon attempting the first |
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183 command - not potentially several commands into the exchange. This |
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184 allows clients to fail faster or prompt for credentials as soon as the |
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185 exchange takes place. This provides a better end-user experience. |
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186 |
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187 Requests to unknown commands or URLS result in an HTTP 404. |
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188 TODO formally define response type, how error is communicated, etc. |
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189 |
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190 HTTP request and response bodies use the *Unified Frame-Based Protocol* |
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191 (defined below) for media exchange. The entirety of the HTTP message |
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192 body is 0 or more frames as defined by this protocol. |
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193 |
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194 Clients and servers MUST advertise the ``TBD`` media type via the |
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195 ``Content-Type`` request and response headers. In addition, clients MUST |
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196 advertise this media type value in their ``Accept`` request header in all |
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197 requests. |
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198 TODO finalize the media type. For now, it is defined in wireprotoserver.py. |
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199 |
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200 Servers receiving requests without an ``Accept`` header SHOULD respond with |
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201 an HTTP 406. |
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202 |
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203 Servers receiving requests with an invalid ``Content-Type`` header SHOULD |
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204 respond with an HTTP 415. |
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205 |
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206 The command to run is specified in the POST payload as defined by the |
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207 *Unified Frame-Based Protocol*. This is redundant with data already |
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208 encoded in the URL. This is by design, so server operators can have |
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209 better understanding about server activity from looking merely at |
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210 HTTP access logs. |
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211 |
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212 In most circumstances, the command specified in the URL MUST match |
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213 the command specified in the frame-based payload or the server will |
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214 respond with an error. The exception to this is the special |
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215 ``multirequest`` URL. (See below.) In addition, HTTP requests |
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216 are limited to one command invocation. The exception is the special |
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217 ``multirequest`` URL. |
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218 |
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219 The ``multirequest`` command endpoints (``ro/multirequest`` and |
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220 ``rw/multirequest``) are special in that they allow the execution of |
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221 *any* command and allow the execution of multiple commands. If the |
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222 HTTP request issues multiple commands across multiple frames, all |
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223 issued commands will be processed by the server. Per the defined |
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224 behavior of the *Unified Frame-Based Protocol*, commands may be |
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225 issued interleaved and responses may come back in a different order |
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226 than they were issued. Clients MUST be able to deal with this. |
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227 |
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228 SSH Protocol |
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229 ============ |
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230 |
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231 Handshake |
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232 --------- |
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233 |
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234 For all clients, the handshake consists of the client sending 1 or more |
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235 commands to the server using version 1 of the transport. Servers respond |
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236 to commands they know how to respond to and send an empty response (``0\n``) |
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237 for unknown commands (per standard behavior of version 1 of the transport). |
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238 Clients then typically look for a response to the newest sent command to |
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239 determine which transport version to use and what the available features for |
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240 the connection and server are. |
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241 |
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242 Preceding any response from client-issued commands, the server may print |
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243 non-protocol output. It is common for SSH servers to print banners, message |
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244 of the day announcements, etc when clients connect. It is assumed that any |
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245 such *banner* output will precede any Mercurial server output. So clients |
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246 must be prepared to handle server output on initial connect that isn't |
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247 in response to any client-issued command and doesn't conform to Mercurial's |
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248 wire protocol. This *banner* output should only be on stdout. However, |
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249 some servers may send output on stderr. |
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250 |
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251 Pre 0.9.1 clients issue a ``between`` command with the ``pairs`` argument |
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252 having the value |
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253 ``0000000000000000000000000000000000000000-0000000000000000000000000000000000000000``. |
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254 |
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255 The ``between`` command has been supported since the original Mercurial |
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256 SSH server. Requesting the empty range will return a ``\n`` string response, |
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257 which will be encoded as ``1\n\n`` (value length of ``1`` followed by a newline |
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258 followed by the value, which happens to be a newline). |
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259 |
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260 For pre 0.9.1 clients and all servers, the exchange looks like:: |
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261 |
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262 c: between\n |
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263 c: pairs 81\n |
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264 c: 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 |
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265 s: 1\n |
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266 s: \n |
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267 |
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268 0.9.1+ clients send a ``hello`` command (with no arguments) before the |
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269 ``between`` command. The response to this command allows clients to |
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270 discover server capabilities and settings. |
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271 |
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272 An example exchange between 0.9.1+ clients and a ``hello`` aware server looks |
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273 like:: |
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274 |
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275 c: hello\n |
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276 c: between\n |
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277 c: pairs 81\n |
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278 c: 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 |
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279 s: 324\n |
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280 s: capabilities: lookup changegroupsubset branchmap pushkey known getbundle ...\n |
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281 s: 1\n |
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282 s: \n |
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283 |
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284 And a similar scenario but with servers sending a banner on connect:: |
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285 |
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286 c: hello\n |
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287 c: between\n |
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288 c: pairs 81\n |
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289 c: 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 |
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290 s: welcome to the server\n |
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291 s: if you find any issues, email someone@somewhere.com\n |
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292 s: 324\n |
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293 s: capabilities: lookup changegroupsubset branchmap pushkey known getbundle ...\n |
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294 s: 1\n |
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295 s: \n |
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296 |
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297 Note that output from the ``hello`` command is terminated by a ``\n``. This is |
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298 part of the response payload and not part of the wire protocol adding a newline |
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299 after responses. In other words, the length of the response contains the |
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300 trailing ``\n``. |
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301 |
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302 Clients supporting version 2 of the SSH transport send a line beginning |
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303 with ``upgrade`` before the ``hello`` and ``between`` commands. The line |
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304 (which isn't a well-formed command line because it doesn't consist of a |
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305 single command name) serves to both communicate the client's intent to |
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306 switch to transport version 2 (transports are version 1 by default) as |
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307 well as to advertise the client's transport-level capabilities so the |
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308 server may satisfy that request immediately. |
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309 |
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310 The upgrade line has the form: |
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311 |
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312 upgrade <token> <transport capabilities> |
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313 |
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314 That is the literal string ``upgrade`` followed by a space, followed by |
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315 a randomly generated string, followed by a space, followed by a string |
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316 denoting the client's transport capabilities. |
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317 |
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318 The token can be anything. However, a random UUID is recommended. (Use |
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319 of version 4 UUIDs is recommended because version 1 UUIDs can leak the |
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320 client's MAC address.) |
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321 |
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322 The transport capabilities string is a URL/percent encoded string |
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323 containing key-value pairs defining the client's transport-level |
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324 capabilities. The following capabilities are defined: |
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325 |
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326 proto |
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327 A comma-delimited list of transport protocol versions the client |
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328 supports. e.g. ``ssh-v2``. |
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329 |
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330 If the server does not recognize the ``upgrade`` line, it should issue |
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331 an empty response and continue processing the ``hello`` and ``between`` |
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332 commands. Here is an example handshake between a version 2 aware client |
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333 and a non version 2 aware server: |
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334 |
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335 c: upgrade 2e82ab3f-9ce3-4b4e-8f8c-6fd1c0e9e23a proto=ssh-v2 |
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336 c: hello\n |
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337 c: between\n |
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338 c: pairs 81\n |
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339 c: 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 |
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340 s: 0\n |
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341 s: 324\n |
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342 s: capabilities: lookup changegroupsubset branchmap pushkey known getbundle ...\n |
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343 s: 1\n |
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344 s: \n |
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345 |
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346 (The initial ``0\n`` line from the server indicates an empty response to |
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347 the unknown ``upgrade ..`` command/line.) |
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348 |
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349 If the server recognizes the ``upgrade`` line and is willing to satisfy that |
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350 upgrade request, it replies to with a payload of the following form: |
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351 |
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352 upgraded <token> <transport name>\n |
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353 |
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354 This line is the literal string ``upgraded``, a space, the token that was |
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355 specified by the client in its ``upgrade ...`` request line, a space, and the |
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356 name of the transport protocol that was chosen by the server. The transport |
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357 name MUST match one of the names the client specified in the ``proto`` field |
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358 of its ``upgrade ...`` request line. |
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359 |
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360 If a server issues an ``upgraded`` response, it MUST also read and ignore |
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361 the lines associated with the ``hello`` and ``between`` command requests |
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362 that were issued by the server. It is assumed that the negotiated transport |
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363 will respond with equivalent requested information following the transport |
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364 handshake. |
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365 |
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366 All data following the ``\n`` terminating the ``upgraded`` line is the |
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367 domain of the negotiated transport. It is common for the data immediately |
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368 following to contain additional metadata about the state of the transport and |
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369 the server. However, this isn't strictly speaking part of the transport |
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370 handshake and isn't covered by this section. |
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371 |
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372 Here is an example handshake between a version 2 aware client and a version |
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373 2 aware server: |
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374 |
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375 c: upgrade 2e82ab3f-9ce3-4b4e-8f8c-6fd1c0e9e23a proto=ssh-v2 |
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376 c: hello\n |
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377 c: between\n |
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378 c: pairs 81\n |
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379 c: 0000000000000000000000000000000000000000-0000000000000000000000000000000000000000 |
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380 s: upgraded 2e82ab3f-9ce3-4b4e-8f8c-6fd1c0e9e23a ssh-v2\n |
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381 s: <additional transport specific data> |
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382 |
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383 The client-issued token that is echoed in the response provides a more |
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384 resilient mechanism for differentiating *banner* output from Mercurial |
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385 output. In version 1, properly formatted banner output could get confused |
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386 for Mercurial server output. By submitting a randomly generated token |
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387 that is then present in the response, the client can look for that token |
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388 in response lines and have reasonable certainty that the line did not |
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389 originate from a *banner* message. |
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390 |
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391 SSH Version 1 Transport |
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392 ----------------------- |
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393 |
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394 The SSH transport (version 1) is a custom text-based protocol suitable for |
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395 use over any bi-directional stream transport. It is most commonly used with |
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396 SSH. |
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397 |
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398 A SSH transport server can be started with ``hg serve --stdio``. The stdin, |
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399 stderr, and stdout file descriptors of the started process are used to exchange |
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400 data. When Mercurial connects to a remote server over SSH, it actually starts |
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401 a ``hg serve --stdio`` process on the remote server. |
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402 |
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403 Commands are issued by sending the command name followed by a trailing newline |
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404 ``\n`` to the server. e.g. ``capabilities\n``. |
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405 |
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406 Command arguments are sent in the following format:: |
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407 |
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408 <argument> <length>\n<value> |
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409 |
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410 That is, the argument string name followed by a space followed by the |
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411 integer length of the value (expressed as a string) followed by a newline |
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412 (``\n``) followed by the raw argument value. |
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413 |
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414 Dictionary arguments are encoded differently:: |
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415 |
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416 <argument> <# elements>\n |
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417 <key1> <length1>\n<value1> |
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418 <key2> <length2>\n<value2> |
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419 ... |
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420 |
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421 Non-argument data is sent immediately after the final argument value. It is |
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422 encoded in chunks:: |
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423 |
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424 <length>\n<data> |
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425 |
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426 Each command declares a list of supported arguments and their types. If a |
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427 client sends an unknown argument to the server, the server should abort |
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428 immediately. The special argument ``*`` in a command's definition indicates |
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429 that all argument names are allowed. |
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430 |
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431 The definition of supported arguments and types is initially made when a |
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432 new command is implemented. The client and server must initially independently |
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433 agree on the arguments and their types. This initial set of arguments can be |
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434 supplemented through the presence of *capabilities* advertised by the server. |
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435 |
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436 Each command has a defined expected response type. |
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437 |
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438 A ``string`` response type is a length framed value. The response consists of |
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439 the string encoded integer length of a value followed by a newline (``\n``) |
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440 followed by the value. Empty values are allowed (and are represented as |
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441 ``0\n``). |
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442 |
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443 A ``stream`` response type consists of raw bytes of data. There is no framing. |
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444 |
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445 A generic error response type is also supported. It consists of a an error |
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446 message written to ``stderr`` followed by ``\n-\n``. In addition, ``\n`` is |
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447 written to ``stdout``. |
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448 |
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449 If the server receives an unknown command, it will send an empty ``string`` |
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450 response. |
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451 |
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452 The server terminates if it receives an empty command (a ``\n`` character). |
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453 |
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454 SSH Version 2 Transport |
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455 ----------------------- |
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456 |
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457 **Experimental and under development** |
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458 |
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459 Version 2 of the SSH transport behaves identically to version 1 of the SSH |
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460 transport with the exception of handshake semantics. See above for how |
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461 version 2 of the SSH transport is negotiated. |
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462 |
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463 Immediately following the ``upgraded`` line signaling a switch to version |
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464 2 of the SSH protocol, the server automatically sends additional details |
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465 about the capabilities of the remote server. This has the form: |
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466 |
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467 <integer length of value>\n |
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468 capabilities: ...\n |
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469 |
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470 e.g. |
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471 |
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472 s: upgraded 2e82ab3f-9ce3-4b4e-8f8c-6fd1c0e9e23a ssh-v2\n |
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473 s: 240\n |
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474 s: capabilities: known getbundle batch ...\n |
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475 |
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476 Following capabilities advertisement, the peers communicate using version |
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477 1 of the SSH transport. |
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478 |
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479 Unified Frame-Based Protocol |
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480 ============================ |
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481 |
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482 **Experimental and under development** |
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483 |
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484 The *Unified Frame-Based Protocol* is a communications protocol between |
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485 Mercurial peers. The protocol aims to be mostly transport agnostic |
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486 (works similarly on HTTP, SSH, etc). |
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487 |
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488 To operate the protocol, a bi-directional, half-duplex pipe supporting |
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489 ordered sends and receives is required. That is, each peer has one pipe |
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490 for sending data and another for receiving. |
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491 |
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492 The protocol is request-response based: the client issues requests to |
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493 the server, which issues replies to those requests. Server-initiated |
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494 messaging is not currently supported, but this specification carves |
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495 out room to implement it. |
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496 |
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497 All data is read and written in atomic units called *frames*. These |
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498 are conceptually similar to TCP packets. Higher-level functionality |
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499 is built on the exchange and processing of frames. |
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500 |
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501 All frames are associated with a numbered request. Frames can thus |
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502 be logically grouped by their request ID. |
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503 |
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504 Frames begin with a 6 octet header followed by a variable length |
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505 payload:: |
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506 |
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507 +-----------------------------------------------+ |
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508 | Length (24) | |
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509 +---------------------------------+-------------+ |
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510 | Request ID (16) | |
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511 +----------+-----------+----------+ |
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512 | Type (4) | Flags (4) | |
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513 +==========+===========+========================================| |
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514 | Frame Payload (0...) ... |
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515 +---------------------------------------------------------------+ |
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516 |
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517 The length of the frame payload is expressed as an unsigned 24 bit |
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518 little endian integer. Values larger than 65535 MUST NOT be used unless |
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519 given permission by the server as part of the negotiated capabilities |
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520 during the handshake. The frame header is not part of the advertised |
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521 frame length. |
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522 |
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523 The 16-bit ``Request ID`` field denotes the integer request identifier, |
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524 stored as an unsigned little endian integer. Odd numbered requests are |
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525 client-initiated. Even numbered requests are server-initiated. This |
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526 refers to where the *request* was initiated - not where the *frame* was |
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527 initiated, so servers will send frames with odd ``Request ID`` in |
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528 response to client-initiated requests. Implementations are advised to |
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529 start ordering request identifiers at ``1`` and ``0``, increment by |
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530 ``2``, and wrap around if all available numbers have been exhausted. |
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531 |
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532 The 4-bit ``Type`` field denotes the type of message being sent. |
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533 |
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534 The 4-bit ``Flags`` field defines special, per-type attributes for |
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535 the frame. |
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536 |
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537 The sections below define the frame types and their behavior. |
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538 |
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539 Command Request (``0x01``) |
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540 -------------------------- |
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541 |
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542 This frame contains a request to run a command. |
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543 |
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544 The name of the command to run constitutes the entirety of the frame |
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545 payload. |
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546 |
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547 This frame type MUST ONLY be sent from clients to servers: it is illegal |
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548 for a server to send this frame to a client. |
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549 |
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550 The following flag values are defined for this type: |
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551 |
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552 0x01 |
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553 End of command data. When set, the client will not send any command |
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554 arguments or additional command data. When set, the command has been |
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555 fully issued and the server has the full context to process the command. |
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556 The next frame issued by the client is not part of this command. |
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557 0x02 |
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558 Command argument frames expected. When set, the client will send |
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559 *Command Argument* frames containing command argument data. |
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560 0x04 |
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561 Command data frames expected. When set, the client will send |
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562 *Command Data* frames containing a raw stream of data for this |
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563 command. |
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564 |
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565 The ``0x01`` flag is mutually exclusive with both the ``0x02`` and ``0x04`` |
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566 flags. |
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567 |
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568 Command Argument (``0x02``) |
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569 --------------------------- |
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570 |
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571 This frame contains a named argument for a command. |
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572 |
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573 The frame type MUST ONLY be sent from clients to servers: it is illegal |
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574 for a server to send this frame to a client. |
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575 |
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576 The payload consists of: |
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577 |
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578 * A 16-bit little endian integer denoting the length of the |
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579 argument name. |
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580 * A 16-bit little endian integer denoting the length of the |
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581 argument value. |
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582 * N bytes of ASCII data containing the argument name. |
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583 * N bytes of binary data containing the argument value. |
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584 |
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585 The payload MUST hold the entirety of the 32-bit header and the |
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586 argument name. The argument value MAY span multiple frames. If this |
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587 occurs, the appropriate frame flag should be set to indicate this. |
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588 |
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589 The following flag values are defined for this type: |
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590 |
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|
591 0x01 |
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592 Argument data continuation. When set, the data for this argument did |
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593 not fit in a single frame and the next frame will contain additional |
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594 argument data. |
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|
595 |
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596 0x02 |
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597 End of arguments data. When set, the client will not send any more |
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598 command arguments for the command this frame is associated with. |
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599 The next frame issued by the client will be command data or |
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600 belong to a separate request. |
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601 |
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602 Command Data (``0x03``) |
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603 ----------------------- |
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604 |
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wireproto: define and implement protocol for issuing requests
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605 This frame contains raw data for a command. |
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606 |
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607 Most commands can be executed by specifying arguments. However, |
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608 arguments have an upper bound to their length. For commands that |
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609 accept data that is beyond this length or whose length isn't known |
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610 when the command is initially sent, they will need to stream |
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611 arbitrary data to the server. This frame type facilitates the sending |
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612 of this data. |
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613 |
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614 The payload of this frame type consists of a stream of raw data to be |
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615 consumed by the command handler on the server. The format of the data |
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616 is command specific. |
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617 |
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618 The following flag values are defined for this type: |
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619 |
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620 0x01 |
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621 Command data continuation. When set, the data for this command |
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622 continues into a subsequent frame. |
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623 |
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624 0x02 |
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625 End of data. When set, command data has been fully sent to the |
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626 server. The command has been fully issued and no new data for this |
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627 command will be sent. The next frame will belong to a new command. |
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628 |
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629 Bytes Response Data (``0x04``) |
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630 ------------------------------ |
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631 |
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632 This frame contains raw bytes response data to an issued command. |
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633 |
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634 The following flag values are defined for this type: |
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635 |
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636 0x01 |
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637 Data continuation. When set, an additional frame containing raw |
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638 response data will follow. |
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639 0x02 |
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640 End of data. When sent, the response data has been fully sent and |
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641 no additional frames for this response will be sent. |
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642 |
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643 The ``0x01`` flag is mutually exclusive with the ``0x02`` flag. |
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644 |
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645 Error Response (``0x05``) |
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646 ------------------------- |
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|
647 |
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648 An error occurred when processing a request. This could indicate |
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649 a protocol-level failure or an application level failure depending |
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650 on the flags for this message type. |
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|
651 |
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652 The payload for this type is an error message that should be |
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653 displayed to the user. |
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|
654 |
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655 The following flag values are defined for this type: |
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|
656 |
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657 0x01 |
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658 The error occurred at the transport/protocol level. If set, the |
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659 connection should be closed. |
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|
660 0x02 |
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|
661 The error occurred at the application level. e.g. invalid command. |
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662 |
37060
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663 Human Output Side-Channel (``0x06``) |
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664 ------------------------------------ |
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|
665 |
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666 This frame contains a message that is intended to be displayed to |
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667 people. Whereas most frames communicate machine readable data, this |
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668 frame communicates textual data that is intended to be shown to |
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|
669 humans. |
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|
670 |
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671 The frame consists of a series of *formatting requests*. Each formatting |
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672 request consists of a formatting string, arguments for that formatting |
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673 string, and labels to apply to that formatting string. |
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|
674 |
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675 A formatting string is a printf()-like string that allows variable |
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676 substitution within the string. Labels allow the rendered text to be |
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677 *decorated*. Assuming use of the canonical Mercurial code base, a |
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678 formatting string can be the input to the ``i18n._`` function. This |
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679 allows messages emitted from the server to be localized. So even if |
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680 the server has different i18n settings, people could see messages in |
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681 their *native* settings. Similarly, the use of labels allows |
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682 decorations like coloring and underlining to be applied using the |
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683 client's configured rendering settings. |
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|
684 |
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685 Formatting strings are similar to ``printf()`` strings or how |
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686 Python's ``%`` operator works. The only supported formatting sequences |
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687 are ``%s`` and ``%%``. ``%s`` will be replaced by whatever the string |
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688 at that position resolves to. ``%%`` will be replaced by ``%``. All |
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689 other 2-byte sequences beginning with ``%`` represent a literal |
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690 ``%`` followed by that character. However, future versions of the |
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691 wire protocol reserve the right to allow clients to opt in to receiving |
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692 formatting strings with additional formatters, hence why ``%%`` is |
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693 required to represent the literal ``%``. |
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694 |
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695 The raw frame consists of a series of data structures representing |
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696 textual atoms to print. Each atom begins with a struct defining the |
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697 size of the data that follows: |
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698 |
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699 * A 16-bit little endian unsigned integer denoting the length of the |
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700 formatting string. |
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701 * An 8-bit unsigned integer denoting the number of label strings |
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702 that follow. |
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703 * An 8-bit unsigned integer denoting the number of formatting string |
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704 arguments strings that follow. |
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705 * An array of 8-bit unsigned integers denoting the lengths of |
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706 *labels* data. |
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707 * An array of 16-bit unsigned integers denoting the lengths of |
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708 formatting strings. |
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709 * The formatting string, encoded as UTF-8. |
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710 * 0 or more ASCII strings defining labels to apply to this atom. |
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711 * 0 or more UTF-8 strings that will be used as arguments to the |
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712 formatting string. |
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|
713 |
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714 All data to be printed MUST be encoded into a single frame: this frame |
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715 does not support spanning data across multiple frames. |
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716 |
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717 All textual data encoded in these frames is assumed to be line delimited. |
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718 The last atom in the frame SHOULD end with a newline (``\n``). If it |
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719 doesn't, clients MAY add a newline to facilitate immediate printing. |
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720 |
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721 Issuing Commands |
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722 ---------------- |
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723 |
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724 A client can request that a remote run a command by sending it |
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725 frames defining that command. This logical stream is composed of |
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726 1 ``Command Request`` frame, 0 or more ``Command Argument`` frames, |
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727 and 0 or more ``Command Data`` frames. |
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|
728 |
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729 All frames composing a single command request MUST be associated with |
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730 the same ``Request ID``. |
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731 |
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732 Clients MAY send additional command requests without waiting on the |
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733 response to a previous command request. If they do so, they MUST ensure |
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734 that the ``Request ID`` field of outbound frames does not conflict |
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735 with that of an active ``Request ID`` whose response has not yet been |
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736 fully received. |
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|
737 |
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738 Servers MAY respond to commands in a different order than they were |
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739 sent over the wire. Clients MUST be prepared to deal with this. Servers |
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740 also MAY start executing commands in a different order than they were |
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741 received, or MAY execute multiple commands concurrently. |
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742 |
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743 If there is a dependency between commands or a race condition between |
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744 commands executing (e.g. a read-only command that depends on the results |
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745 of a command that mutates the repository), then clients MUST NOT send |
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746 frames issuing a command until a response to all dependent commands has |
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747 been received. |
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748 TODO think about whether we should express dependencies between commands |
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749 to avoid roundtrip latency. |
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750 |
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751 Argument frames are the recommended mechanism for transferring fixed |
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752 sets of parameters to a command. Data frames are appropriate for |
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753 transferring variable data. A similar comparison would be to HTTP: |
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754 argument frames are headers and the message body is data frames. |
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755 |
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756 It is recommended for servers to delay the dispatch of a command |
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757 until all argument frames for that command have been received. Servers |
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758 MAY impose limits on the maximum argument size. |
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759 TODO define failure mechanism. |
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|
760 |
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761 Servers MAY dispatch to commands immediately once argument data |
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762 is available or delay until command data is received in full. |
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763 |
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764 Capabilities |
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765 ============ |
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766 |
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767 Servers advertise supported wire protocol features. This allows clients to |
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768 probe for server features before blindly calling a command or passing a |
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769 specific argument. |
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770 |
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771 The server's features are exposed via a *capabilities* string. This is a |
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772 space-delimited string of tokens/features. Some features are single words |
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773 like ``lookup`` or ``batch``. Others are complicated key-value pairs |
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774 advertising sub-features. e.g. ``httpheader=2048``. When complex, non-word |
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775 values are used, each feature name can define its own encoding of sub-values. |
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776 Comma-delimited and ``x-www-form-urlencoded`` values are common. |
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777 |
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778 The following document capabilities defined by the canonical Mercurial server |
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779 implementation. |
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780 |
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781 batch |
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782 ----- |
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783 |
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784 Whether the server supports the ``batch`` command. |
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785 |
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786 This capability/command was introduced in Mercurial 1.9 (released July 2011). |
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787 |
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788 branchmap |
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789 --------- |
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790 |
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791 Whether the server supports the ``branchmap`` command. |
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792 |
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793 This capability/command was introduced in Mercurial 1.3 (released July 2009). |
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794 |
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795 bundle2-exp |
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796 ----------- |
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797 |
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798 Precursor to ``bundle2`` capability that was used before bundle2 was a |
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799 stable feature. |
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800 |
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801 This capability was introduced in Mercurial 3.0 behind an experimental |
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802 flag. This capability should not be observed in the wild. |
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803 |
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804 bundle2 |
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805 ------- |
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806 |
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807 Indicates whether the server supports the ``bundle2`` data exchange format. |
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808 |
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809 The value of the capability is a URL quoted, newline (``\n``) delimited |
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810 list of keys or key-value pairs. |
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811 |
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812 A key is simply a URL encoded string. |
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813 |
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814 A key-value pair is a URL encoded key separated from a URL encoded value by |
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815 an ``=``. If the value is a list, elements are delimited by a ``,`` after |
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816 URL encoding. |
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817 |
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818 For example, say we have the values:: |
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819 |
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820 {'HG20': [], 'changegroup': ['01', '02'], 'digests': ['sha1', 'sha512']} |
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821 |
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822 We would first construct a string:: |
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823 |
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824 HG20\nchangegroup=01,02\ndigests=sha1,sha512 |
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825 |
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826 We would then URL quote this string:: |
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|
827 |
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|
828 HG20%0Achangegroup%3D01%2C02%0Adigests%3Dsha1%2Csha512 |
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|
829 |
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|
830 This capability was introduced in Mercurial 3.4 (released May 2015). |
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|
831 |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
832 changegroupsubset |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
833 ----------------- |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
834 |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
835 Whether the server supports the ``changegroupsubset`` command. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
836 |
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|
837 This capability was introduced in Mercurial 0.9.2 (released December |
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parents:
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|
838 2006). |
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parents:
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|
839 |
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parents:
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840 This capability was introduced at the same time as the ``lookup`` |
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|
841 capability/command. |
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parents:
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|
842 |
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|
843 compression |
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|
844 ----------- |
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|
845 |
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parents:
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846 Declares support for negotiating compression formats. |
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|
847 |
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848 Presence of this capability indicates the server supports dynamic selection |
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849 of compression formats based on the client request. |
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parents:
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850 |
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851 Servers advertising this capability are required to support the |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
852 ``application/mercurial-0.2`` media type in response to commands returning |
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parents:
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|
853 streams. Servers may support this media type on any command. |
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parents:
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|
854 |
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parents:
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diff
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|
855 The value of the capability is a comma-delimited list of strings declaring |
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parents:
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diff
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|
856 supported compression formats. The order of the compression formats is in |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
857 server-preferred order, most preferred first. |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
858 |
30761
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util: declare wire protocol support of compression engines
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parents:
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|
859 The identifiers used by the official Mercurial distribution are: |
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parents:
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|
860 |
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|
861 bzip2 |
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|
862 bzip2 |
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parents:
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|
863 none |
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|
864 uncompressed / raw data |
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|
865 zlib |
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|
866 zlib (no gzip header) |
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|
867 zstd |
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|
868 zstd |
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|
869 |
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|
870 This capability was introduced in Mercurial 4.1 (released February 2017). |
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parents:
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diff
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|
871 |
29863
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Gregory Szorc <gregory.szorc@gmail.com>
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|
872 getbundle |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
873 --------- |
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parents:
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diff
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|
874 |
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|
875 Whether the server supports the ``getbundle`` command. |
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help: document wire protocol capabilities
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parents:
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|
876 |
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parents:
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diff
changeset
|
877 This capability was introduced in Mercurial 1.9 (released July 2011). |
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|
878 |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
879 httpheader |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
880 ---------- |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
881 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
882 Whether the server supports receiving command arguments via HTTP request |
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|
883 headers. |
2435ba6c82e6
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parents:
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diff
changeset
|
884 |
2435ba6c82e6
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parents:
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|
885 The value of the capability is an integer describing the max header |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
886 length that clients should send. Clients should ignore any content after a |
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parents:
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diff
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|
887 comma in the value, as this is reserved for future use. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
888 |
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parents:
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changeset
|
889 This capability was introduced in Mercurial 1.9 (released July 2011). |
2435ba6c82e6
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|
890 |
30760
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|
891 httpmediatype |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
892 ------------- |
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|
893 |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
894 Indicates which HTTP media types (``Content-Type`` header) the server is |
753b9d43ca81
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|
895 capable of receiving and sending. |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
896 |
753b9d43ca81
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|
897 The value of the capability is a comma-delimited list of strings identifying |
753b9d43ca81
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parents:
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|
898 support for media type and transmission direction. The following strings may |
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|
899 be present: |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
900 |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
changeset
|
901 0.1rx |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
902 Indicates server support for receiving ``application/mercurial-0.1`` media |
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parents:
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|
903 types. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
904 |
753b9d43ca81
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diff
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|
905 0.1tx |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29865
diff
changeset
|
906 Indicates server support for sending ``application/mercurial-0.1`` media |
753b9d43ca81
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parents:
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|
907 types. |
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parents:
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diff
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|
908 |
753b9d43ca81
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parents:
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|
909 0.2rx |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
910 Indicates server support for receiving ``application/mercurial-0.2`` media |
753b9d43ca81
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parents:
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diff
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|
911 types. |
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parents:
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diff
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|
912 |
753b9d43ca81
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parents:
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diff
changeset
|
913 0.2tx |
753b9d43ca81
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parents:
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diff
changeset
|
914 Indicates server support for sending ``application/mercurial-0.2`` media |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
915 types. |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
916 |
753b9d43ca81
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parents:
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diff
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|
917 minrx=X |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29865
diff
changeset
|
918 Minimum media type version the server is capable of receiving. Value is a |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
919 string like ``0.2``. |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
920 |
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parents:
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|
921 This capability can be used by servers to limit connections from legacy |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
922 clients not using the latest supported media type. However, only clients |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
923 with knowledge of this capability will know to consult this value. This |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
924 capability is present so the client may issue a more user-friendly error |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
925 when the server has locked out a legacy client. |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
926 |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
927 mintx=X |
753b9d43ca81
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parents:
29865
diff
changeset
|
928 Minimum media type version the server is capable of sending. Value is a |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
929 string like ``0.1``. |
753b9d43ca81
internals: document compression negotiation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
930 |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
931 Servers advertising support for the ``application/mercurial-0.2`` media type |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
932 should also advertise the ``compression`` capability. |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
933 |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
934 This capability was introduced in Mercurial 4.1 (released February 2017). |
753b9d43ca81
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
935 |
29863
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parents:
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diff
changeset
|
936 httppostargs |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29860
diff
changeset
|
937 ------------ |
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parents:
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diff
changeset
|
938 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
939 **Experimental** |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29860
diff
changeset
|
940 |
2435ba6c82e6
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parents:
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diff
changeset
|
941 Indicates that the server supports and prefers clients send command arguments |
2435ba6c82e6
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parents:
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diff
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|
942 via a HTTP POST request as part of the request body. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
943 |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
944 This capability was introduced in Mercurial 3.8 (released May 2016). |
2435ba6c82e6
help: document wire protocol capabilities
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
945 |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
946 known |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
947 ----- |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29860
diff
changeset
|
948 |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
949 Whether the server supports the ``known`` command. |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
950 |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29860
diff
changeset
|
951 This capability/command was introduced in Mercurial 1.9 (released July 2011). |
2435ba6c82e6
help: document wire protocol capabilities
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
952 |
2435ba6c82e6
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29860
diff
changeset
|
953 lookup |
2435ba6c82e6
help: document wire protocol capabilities
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29860
diff
changeset
|
954 ------ |
2435ba6c82e6
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955 |
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956 Whether the server supports the ``lookup`` command. |
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957 |
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958 This capability was introduced in Mercurial 0.9.2 (released December |
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959 2006). |
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960 |
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961 This capability was introduced at the same time as the ``changegroupsubset`` |
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962 capability/command. |
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|
963 |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
964 pushkey |
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|
965 ------- |
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|
966 |
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967 Whether the server supports the ``pushkey`` and ``listkeys`` commands. |
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968 |
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969 This capability was introduced in Mercurial 1.6 (released July 2010). |
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970 |
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diff
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|
971 standardbundle |
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972 -------------- |
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|
973 |
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974 **Unsupported** |
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|
975 |
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976 This capability was introduced during the Mercurial 0.9.2 development cycle in |
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977 2006. It was never present in a release, as it was replaced by the ``unbundle`` |
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978 capability. This capability should not be encountered in the wild. |
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|
979 |
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|
980 stream-preferred |
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|
981 ---------------- |
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982 |
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983 If present the server prefers that clients clone using the streaming clone |
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984 protocol (``hg clone --stream``) rather than the standard |
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985 changegroup/bundle based protocol. |
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|
986 |
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987 This capability was introduced in Mercurial 2.2 (released May 2012). |
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988 |
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|
989 streamreqs |
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|
990 ---------- |
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|
991 |
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|
992 Indicates whether the server supports *streaming clones* and the *requirements* |
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|
993 that clients must support to receive it. |
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994 |
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|
995 If present, the server supports the ``stream_out`` command, which transmits |
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996 raw revlogs from the repository instead of changegroups. This provides a faster |
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997 cloning mechanism at the expense of more bandwidth used. |
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998 |
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999 The value of this capability is a comma-delimited list of repo format |
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1000 *requirements*. These are requirements that impact the reading of data in |
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1001 the ``.hg/store`` directory. An example value is |
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|
1002 ``streamreqs=generaldelta,revlogv1`` indicating the server repo requires |
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1003 the ``revlogv1`` and ``generaldelta`` requirements. |
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|
1004 |
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1005 If the only format requirement is ``revlogv1``, the server may expose the |
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1006 ``stream`` capability instead of the ``streamreqs`` capability. |
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1007 |
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1008 This capability was introduced in Mercurial 1.7 (released November 2010). |
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1009 |
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|
1010 stream |
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|
1011 ------ |
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|
1012 |
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1013 Whether the server supports *streaming clones* from ``revlogv1`` repos. |
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1014 |
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1015 If present, the server supports the ``stream_out`` command, which transmits |
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1016 raw revlogs from the repository instead of changegroups. This provides a faster |
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|
1017 cloning mechanism at the expense of more bandwidth used. |
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|
1018 |
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|
1019 This capability was introduced in Mercurial 0.9.1 (released July 2006). |
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1020 |
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1021 When initially introduced, the value of the capability was the numeric |
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1022 revlog revision. e.g. ``stream=1``. This indicates the changegroup is using |
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1023 ``revlogv1``. This simple integer value wasn't powerful enough, so the |
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1024 ``streamreqs`` capability was invented to handle cases where the repo |
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|
1025 requirements have more than just ``revlogv1``. Newer servers omit the |
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1026 ``=1`` since it was the only value supported and the value of ``1`` can |
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1027 be implied by clients. |
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|
1028 |
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|
1029 unbundlehash |
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|
1030 ------------ |
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|
1031 |
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|
1032 Whether the ``unbundle`` commands supports receiving a hash of all the |
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1033 heads instead of a list. |
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|
1034 |
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|
1035 For more, see the documentation for the ``unbundle`` command. |
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|
1036 |
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1037 This capability was introduced in Mercurial 1.9 (released July 2011). |
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1038 |
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|
1039 unbundle |
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|
1040 -------- |
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1041 |
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|
1042 Whether the server supports pushing via the ``unbundle`` command. |
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1043 |
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1044 This capability/command has been present since Mercurial 0.9.1 (released |
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|
1045 July 2006). |
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|
1046 |
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|
1047 Mercurial 0.9.2 (released December 2006) added values to the capability |
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|
1048 indicating which bundle types the server supports receiving. This value is a |
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|
1049 comma-delimited list. e.g. ``HG10GZ,HG10BZ,HG10UN``. The order of values |
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|
1050 reflects the priority/preference of that type, where the first value is the |
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|
1051 most preferred type. |
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|
1052 |
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1053 Content Negotiation |
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|
1054 =================== |
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1055 |
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1056 The wire protocol has some mechanisms to help peers determine what content |
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1057 types and encoding the other side will accept. Historically, these mechanisms |
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1058 have been built into commands themselves because most commands only send a |
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1059 well-defined response type and only certain commands needed to support |
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|
1060 functionality like compression. |
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|
1061 |
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1062 Currently, only the HTTP version 1 transport supports content negotiation |
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|
1063 at the protocol layer. |
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|
1064 |
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|
1065 HTTP requests advertise supported response formats via the ``X-HgProto-<N>`` |
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|
1066 request header, where ``<N>`` is an integer starting at 1 allowing the logical |
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1067 value to span multiple headers. This value consists of a list of |
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1068 space-delimited parameters. Each parameter denotes a feature or capability. |
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1069 |
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1070 The following parameters are defined: |
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1071 |
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|
1072 0.1 |
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|
1073 Indicates the client supports receiving ``application/mercurial-0.1`` |
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1074 responses. |
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1075 |
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|
1076 0.2 |
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|
1077 Indicates the client supports receiving ``application/mercurial-0.2`` |
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|
1078 responses. |
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|
1079 |
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|
1080 comp |
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|
1081 Indicates compression formats the client can decode. Value is a list of |
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|
1082 comma delimited strings identifying compression formats ordered from |
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|
1083 most preferential to least preferential. e.g. ``comp=zstd,zlib,none``. |
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|
1084 |
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1085 This parameter does not have an effect if only the ``0.1`` parameter |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
1086 is defined, as support for ``application/mercurial-0.2`` or greater is |
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|
1087 required to use arbitrary compression formats. |
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|
1088 |
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|
1089 If this parameter is not advertised, the server interprets this as |
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|
1090 equivalent to ``zlib,none``. |
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|
1091 |
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1092 Clients may choose to only send this header if the ``httpmediatype`` |
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Gregory Szorc <gregory.szorc@gmail.com>
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1093 server capability is present, as currently all server-side features |
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|
1094 consulting this header require the client to opt in to new protocol features |
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|
1095 advertised via the ``httpmediatype`` capability. |
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|
1096 |
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|
1097 A server that doesn't receive an ``X-HgProto-<N>`` header should infer a |
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|
1098 value of ``0.1``. This is compatible with legacy clients. |
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1099 |
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1100 A server receiving a request indicating support for multiple media type |
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1101 versions may respond with any of the supported media types. Not all servers |
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|
1102 may support all media types on all commands. |
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|
1103 |
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|
1104 Commands |
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|
1105 ======== |
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|
1106 |
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1107 This section contains a list of all wire protocol commands implemented by |
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|
1108 the canonical Mercurial server. |
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|
1109 |
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|
1110 batch |
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|
1111 ----- |
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|
1112 |
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|
1113 Issue multiple commands while sending a single command request. The purpose |
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|
1114 of this command is to allow a client to issue multiple commands while avoiding |
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|
1115 multiple round trips to the server therefore enabling commands to complete |
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|
1116 quicker. |
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|
1117 |
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|
1118 The command accepts a ``cmds`` argument that contains a list of commands to |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
1119 execute. |
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|
1120 |
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|
1121 The value of ``cmds`` is a ``;`` delimited list of strings. Each string has the |
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1122 form ``<command> <arguments>``. That is, the command name followed by a space |
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|
1123 followed by an argument string. |
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|
1124 |
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|
1125 The argument string is a ``,`` delimited list of ``<key>=<value>`` values |
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|
1126 corresponding to command arguments. Both the argument name and value are |
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|
1127 escaped using a special substitution map:: |
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|
1128 |
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|
1129 : -> :c |
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|
1130 , -> :o |
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|
1131 ; -> :s |
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|
1132 = -> :e |
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|
1133 |
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|
1134 The response type for this command is ``string``. The value contains a |
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|
1135 ``;`` delimited list of responses for each requested command. Each value |
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|
1136 in this list is escaped using the same substitution map used for arguments. |
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|
1137 |
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|
1138 If an error occurs, the generic error response may be sent. |
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|
1139 |
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|
1140 between |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
1141 ------- |
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|
1142 |
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|
1143 (Legacy command used for discovery in old clients) |
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|
1144 |
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|
1145 Obtain nodes between pairs of nodes. |
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|
1146 |
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|
1147 The ``pairs`` arguments contains a space-delimited list of ``-`` delimited |
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|
1148 hex node pairs. e.g.:: |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
1149 |
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|
1150 a072279d3f7fd3a4aa7ffa1a5af8efc573e1c896-6dc58916e7c070f678682bfe404d2e2d68291a18 |
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|
1151 |
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|
1152 Return type is a ``string``. Value consists of lines corresponding to each |
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|
1153 requested range. Each line contains a space-delimited list of hex nodes. |
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parents:
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|
1154 A newline ``\n`` terminates each line, including the last one. |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
1155 |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
1156 branchmap |
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Gregory Szorc <gregory.szorc@gmail.com>
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diff
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|
1157 --------- |
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|
1158 |
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|
1159 Obtain heads in named branches. |
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|
1160 |
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1161 Accepts no arguments. Return type is a ``string``. |
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|
1162 |
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|
1163 Return value contains lines with URL encoded branch names followed by a space |
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|
1164 followed by a space-delimited list of hex nodes of heads on that branch. |
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|
1165 e.g.:: |
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|
1166 |
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|
1167 default a072279d3f7fd3a4aa7ffa1a5af8efc573e1c896 6dc58916e7c070f678682bfe404d2e2d68291a18 |
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|
1168 stable baae3bf31522f41dd5e6d7377d0edd8d1cf3fccc |
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|
1169 |
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|
1170 There is no trailing newline. |
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|
1171 |
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|
1172 branches |
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|
1173 -------- |
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|
1174 |
32133
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|
1175 (Legacy command used for discovery in old clients. Clients with ``getbundle`` |
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|
1176 use the ``known`` and ``heads`` commands instead.) |
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|
1177 |
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|
1178 Obtain ancestor changesets of specific nodes back to a branch point. |
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|
1179 |
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|
1180 Despite the name, this command has nothing to do with Mercurial named branches. |
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1181 Instead, it is related to DAG branches. |
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|
1182 |
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|
1183 The command accepts a ``nodes`` argument, which is a string of space-delimited |
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|
1184 hex nodes. |
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|
1185 |
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|
1186 For each node requested, the server will find the first ancestor node that is |
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|
1187 a DAG root or is a merge. |
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|
1188 |
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|
1189 Return type is a ``string``. Return value contains lines with result data for |
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|
1190 each requested node. Each line contains space-delimited nodes followed by a |
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|
1191 newline (``\n``). The 4 nodes reported on each line correspond to the requested |
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|
1192 node, the ancestor node found, and its 2 parent nodes (which may be the null |
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|
1193 node). |
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|
1194 |
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|
1195 capabilities |
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|
1196 ------------ |
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|
1197 |
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|
1198 Obtain the capabilities string for the repo. |
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|
1199 |
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1200 Unlike the ``hello`` command, the capabilities string is not prefixed. |
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|
1201 There is no trailing newline. |
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|
1202 |
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|
1203 This command does not accept any arguments. Return type is a ``string``. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1204 |
35883
0d8024be7166
internals: document when "hello" and "capabilities" commands were added
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1205 This command was introduced in Mercurial 0.9.1 (released July 2006). |
0d8024be7166
internals: document when "hello" and "capabilities" commands were added
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1206 |
29865
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1207 changegroup |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1208 ----------- |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1209 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1210 (Legacy command: use ``getbundle`` instead) |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1211 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1212 Obtain a changegroup version 1 with data for changesets that are |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1213 descendants of client-specified changesets. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1214 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1215 The ``roots`` arguments contains a list of space-delimited hex nodes. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1216 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1217 The server responds with a changegroup version 1 containing all |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1218 changesets between the requested root/base nodes and the repo's head nodes |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1219 at the time of the request. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1220 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1221 The return type is a ``stream``. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1222 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1223 changegroupsubset |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1224 ----------------- |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1225 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1226 (Legacy command: use ``getbundle`` instead) |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1227 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1228 Obtain a changegroup version 1 with data for changesetsets between |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
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|
1229 client specified base and head nodes. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1230 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1231 The ``bases`` argument contains a list of space-delimited hex nodes. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1232 The ``heads`` argument contains a list of space-delimited hex nodes. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1233 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1234 The server responds with a changegroup version 1 containing all |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1235 changesets between the requested base and head nodes at the time of the |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1236 request. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1237 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1238 The return type is a ``stream``. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1239 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1240 clonebundles |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1241 ------------ |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1242 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1243 Obtains a manifest of bundle URLs available to seed clones. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
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|
1244 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1245 Each returned line contains a URL followed by metadata. See the |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1246 documentation in the ``clonebundles`` extension for more. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1247 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1248 The return type is a ``string``. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1249 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1250 getbundle |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1251 --------- |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1252 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1253 Obtain a bundle containing repository data. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1254 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1255 This command accepts the following arguments: |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1256 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1257 heads |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1258 List of space-delimited hex nodes of heads to retrieve. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1259 common |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1260 List of space-delimited hex nodes that the client has in common with the |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1261 server. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1262 obsmarkers |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1263 Boolean indicating whether to include obsolescence markers as part |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1264 of the response. Only works with bundle2. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1265 bundlecaps |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1266 Comma-delimited set of strings defining client bundle capabilities. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1267 listkeys |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1268 Comma-delimited list of strings of ``pushkey`` namespaces. For each |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1269 namespace listed, a bundle2 part will be included with the content of |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1270 that namespace. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1271 cg |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1272 Boolean indicating whether changegroup data is requested. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1273 cbattempted |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1274 Boolean indicating whether the client attempted to use the *clone bundles* |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1275 feature before performing this request. |
35267
cb4dcd7fabe7
getbundle: add support for 'bookmarks' boolean argument
Boris Feld <boris.feld@octobus.net>
parents:
34930
diff
changeset
|
1276 bookmarks |
cb4dcd7fabe7
getbundle: add support for 'bookmarks' boolean argument
Boris Feld <boris.feld@octobus.net>
parents:
34930
diff
changeset
|
1277 Boolean indicating whether bookmark data is requested. |
34930
28baeab476cc
internal-doc: document the 'phases' parameters to 'getbundle'
Boris Feld <boris.feld@octobus.net>
parents:
34393
diff
changeset
|
1278 phases |
28baeab476cc
internal-doc: document the 'phases' parameters to 'getbundle'
Boris Feld <boris.feld@octobus.net>
parents:
34393
diff
changeset
|
1279 Boolean indicating whether phases data is requested. |
29865
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1280 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1281 The return type on success is a ``stream`` where the value is bundle. |
35975
40d94ea51402
internals: refactor wire protocol documentation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
35883
diff
changeset
|
1282 On the HTTP version 1 transport, the response is zlib compressed. |
29865
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1283 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1284 If an error occurs, a generic error response can be sent. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1285 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1286 Unless the client sends a false value for the ``cg`` argument, the returned |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1287 bundle contains a changegroup with the nodes between the specified ``common`` |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1288 and ``heads`` nodes. Depending on the command arguments, the type and content |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1289 of the returned bundle can vary significantly. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1290 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1291 The default behavior is for the server to send a raw changegroup version |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1292 ``01`` response. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1293 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1294 If the ``bundlecaps`` provided by the client contain a value beginning |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1295 with ``HG2``, a bundle2 will be returned. The bundle2 data may contain |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1296 additional repository data, such as ``pushkey`` namespace values. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1297 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1298 heads |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1299 ----- |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1300 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1301 Returns a list of space-delimited hex nodes of repository heads followed |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1302 by a newline. e.g. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1303 ``a9eeb3adc7ddb5006c088e9eda61791c777cbf7c 31f91a3da534dc849f0d6bfc00a395a97cf218a1\n`` |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1304 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1305 This command does not accept any arguments. The return type is a ``string``. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1306 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1307 hello |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1308 ----- |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1309 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1310 Returns lines describing interesting things about the server in an RFC-822 |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1311 like format. |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1312 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1313 Currently, the only line defines the server capabilities. It has the form:: |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1314 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1315 capabilities: <value> |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1316 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1317 See above for more about the capabilities string. |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1318 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1319 SSH clients typically issue this command as soon as a connection is |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1320 established. |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1321 |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1322 This command does not accept any arguments. The return type is a ``string``. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1323 |
35883
0d8024be7166
internals: document when "hello" and "capabilities" commands were added
Gregory Szorc <gregory.szorc@gmail.com>
parents:
35267
diff
changeset
|
1324 This command was introduced in Mercurial 0.9.1 (released July 2006). |
0d8024be7166
internals: document when "hello" and "capabilities" commands were added
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1325 |
29865
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1326 listkeys |
80c11c1a64bf
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
29864
diff
changeset
|
1327 -------- |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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diff
changeset
|
1328 |
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1329 List values in a specified ``pushkey`` namespace. |
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|
1330 |
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|
1331 The ``namespace`` argument defines the pushkey namespace to operate on. |
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1332 |
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|
1333 The return type is a ``string``. The value is an encoded dictionary of keys. |
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|
1334 |
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1335 Key-value pairs are delimited by newlines (``\n``). Within each line, keys and |
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1336 values are separated by a tab (``\t``). Keys and values are both strings. |
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1337 |
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1338 lookup |
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|
1339 ------ |
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1340 |
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1341 Try to resolve a value to a known repository revision. |
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1342 |
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1343 The ``key`` argument is converted from bytes to an |
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1344 ``encoding.localstr`` instance then passed into |
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1345 ``localrepository.__getitem__`` in an attempt to resolve it. |
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|
1346 |
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1347 The return type is a ``string``. |
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1348 |
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1349 Upon successful resolution, returns ``1 <hex node>\n``. On failure, |
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1350 returns ``0 <error string>\n``. e.g.:: |
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1351 |
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1352 1 273ce12ad8f155317b2c078ec75a4eba507f1fba\n |
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1353 |
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1354 0 unknown revision 'foo'\n |
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1355 |
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|
1356 known |
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|
1357 ----- |
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|
1358 |
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1359 Determine whether multiple nodes are known. |
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1360 |
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1361 The ``nodes`` argument is a list of space-delimited hex nodes to check |
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|
1362 for existence. |
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|
1363 |
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1364 The return type is ``string``. |
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|
1365 |
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1366 Returns a string consisting of ``0``s and ``1``s indicating whether nodes |
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1367 are known. If the Nth node specified in the ``nodes`` argument is known, |
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1368 a ``1`` will be returned at byte offset N. If the node isn't known, ``0`` |
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1369 will be present at byte offset N. |
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|
1370 |
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1371 There is no trailing newline. |
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1372 |
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|
1373 pushkey |
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1374 ------- |
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|
1375 |
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1376 Set a value using the ``pushkey`` protocol. |
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|
1377 |
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1378 Accepts arguments ``namespace``, ``key``, ``old``, and ``new``, which |
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1379 correspond to the pushkey namespace to operate on, the key within that |
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1380 namespace to change, the old value (which may be empty), and the new value. |
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1381 All arguments are string types. |
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|
1382 |
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1383 The return type is a ``string``. The value depends on the transport protocol. |
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1384 |
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1385 The SSH version 1 transport sends a string encoded integer followed by a |
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1386 newline (``\n``) which indicates operation result. The server may send |
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1387 additional output on the ``stderr`` stream that should be displayed to the |
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|
1388 user. |
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|
1389 |
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1390 The HTTP version 1 transport sends a string encoded integer followed by a |
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1391 newline followed by additional server output that should be displayed to |
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1392 the user. This may include output from hooks, etc. |
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1393 |
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1394 The integer result varies by namespace. ``0`` means an error has occurred |
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1395 and there should be additional output to display to the user. |
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1396 |
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1397 stream_out |
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|
1398 ---------- |
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|
1399 |
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1400 Obtain *streaming clone* data. |
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1401 |
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1402 The return type is either a ``string`` or a ``stream``, depending on |
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1403 whether the request was fulfilled properly. |
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1404 |
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1405 A return value of ``1\n`` indicates the server is not configured to serve |
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1406 this data. If this is seen by the client, they may not have verified the |
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1407 ``stream`` capability is set before making the request. |
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1408 |
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1409 A return value of ``2\n`` indicates the server was unable to lock the |
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1410 repository to generate data. |
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1411 |
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1412 All other responses are a ``stream`` of bytes. The first line of this data |
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1413 contains 2 space-delimited integers corresponding to the path count and |
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|
1414 payload size, respectively:: |
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|
1415 |
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|
1416 <path count> <payload size>\n |
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|
1417 |
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1418 The ``<payload size>`` is the total size of path data: it does not include |
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1419 the size of the per-path header lines. |
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1420 |
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1421 Following that header are ``<path count>`` entries. Each entry consists of a |
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1422 line with metadata followed by raw revlog data. The line consists of:: |
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1423 |
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1424 <store path>\0<size>\n |
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|
1425 |
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1426 The ``<store path>`` is the encoded store path of the data that follows. |
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1427 ``<size>`` is the amount of data for this store path/revlog that follows the |
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1428 newline. |
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|
1429 |
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1430 There is no trailer to indicate end of data. Instead, the client should stop |
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1431 reading after ``<path count>`` entries are consumed. |
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1432 |
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|
1433 unbundle |
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|
1434 -------- |
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|
1435 |
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1436 Send a bundle containing data (usually changegroup data) to the server. |
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1437 |
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1438 Accepts the argument ``heads``, which is a space-delimited list of hex nodes |
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1439 corresponding to server repository heads observed by the client. This is used |
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1440 to detect race conditions and abort push operations before a server performs |
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1441 too much work or a client transfers too much data. |
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1442 |
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1443 The request payload consists of a bundle to be applied to the repository, |
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1444 similarly to as if :hg:`unbundle` were called. |
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1445 |
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1446 In most scenarios, a special ``push response`` type is returned. This type |
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1447 contains an integer describing the change in heads as a result of the |
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1448 operation. A value of ``0`` indicates nothing changed. ``1`` means the number |
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1449 of heads remained the same. Values ``2`` and larger indicate the number of |
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1450 added heads minus 1. e.g. ``3`` means 2 heads were added. Negative values |
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1451 indicate the number of fewer heads, also off by 1. e.g. ``-2`` means there |
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Gregory Szorc <gregory.szorc@gmail.com>
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1452 is 1 fewer head. |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1453 |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1454 The encoding of the ``push response`` type varies by transport. |
80c11c1a64bf
help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1455 |
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Gregory Szorc <gregory.szorc@gmail.com>
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1456 For the SSH version 1 transport, this type is composed of 2 ``string`` |
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internals: refactor wire protocol documentation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1457 responses: an empty response (``0\n``) followed by the integer result value. |
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internals: refactor wire protocol documentation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1458 e.g. ``1\n2``. So the full response might be ``0\n1\n2``. |
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Gregory Szorc <gregory.szorc@gmail.com>
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1459 |
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internals: refactor wire protocol documentation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1460 For the HTTP version 1 transport, the response is a ``string`` type composed |
40d94ea51402
internals: refactor wire protocol documentation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1461 of an integer result value followed by a newline (``\n``) followed by string |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1462 content holding server output that should be displayed on the client (output |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1463 hooks, etc). |
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help: document wire protocol commands
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1464 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1465 In some cases, the server may respond with a ``bundle2`` bundle. In this |
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Gregory Szorc <gregory.szorc@gmail.com>
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1466 case, the response type is ``stream``. For the HTTP version 1 transport, the |
40d94ea51402
internals: refactor wire protocol documentation
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1467 response is zlib compressed. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1468 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1469 The server may also respond with a generic error type, which contains a string |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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1470 indicating the failure. |