author | Gregory Szorc <gregory.szorc@gmail.com> |
Mon, 17 Sep 2018 11:54:00 -0700 | |
changeset 39813 | c30faea8d02d |
parent 39812 | 8e7e822e85ec |
child 39814 | d059cb669632 |
permissions | -rw-r--r-- |
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**Experimental and under active development** |
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This section documents the wire protocol commands exposed to transports |
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using the frame-based protocol. The set of commands exposed through |
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these transports is distinct from the set of commands exposed to legacy |
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transports. |
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The frame-based protocol uses CBOR to encode command execution requests. |
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All command arguments must be mapped to a specific or set of CBOR data |
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types. |
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The response to many commands is also CBOR. There is no common response |
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format: each command defines its own response format. |
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TODOs |
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===== |
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* Add "node namespace" support to each command. In order to support |
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SHA-1 hash transition, we want servers to be able to expose different |
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"node namespaces" for the same data. Every command operating on nodes |
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should specify which "node namespace" it is operating on and responses |
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should encode the "node namespace" accordingly. |
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Commands |
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======== |
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The sections below detail all commands available to wire protocol version |
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2. |
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branchmap |
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--------- |
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Obtain heads in named branches. |
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Receives no arguments. |
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The response is a map with bytestring keys defining the branch name. |
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Values are arrays of bytestring defining raw changeset nodes. |
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capabilities |
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------------ |
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Obtain the server's capabilities. |
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Receives no arguments. |
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This command is typically called only as part of the handshake during |
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initial connection establishment. |
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The response is a map with bytestring keys defining server information. |
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The defined keys are: |
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commands |
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A map defining available wire protocol commands on this server. |
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Keys in the map are the names of commands that can be invoked. Values |
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are maps defining information about that command. The bytestring keys |
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are: |
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args |
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(map) Describes arguments accepted by the command. |
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Keys are bytestrings denoting the argument name. |
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Values are maps describing the argument. The map has the following |
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bytestring keys: |
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default |
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(varied) The default value for this argument if not specified. Only |
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present if ``required`` is not true. |
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required |
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(boolean) Whether the argument must be specified. Failure to send |
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required arguments will result in an error executing the command. |
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type |
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(bytestring) The type of the argument. e.g. ``bytes`` or ``bool``. |
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validvalues |
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(set) Values that are recognized for this argument. Some arguments |
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only allow a fixed set of values to be specified. These arguments |
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may advertise that set in this key. If this set is advertised and |
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a value not in this set is specified, the command should result |
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in error. |
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permissions |
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An array of permissions required to execute this command. |
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compression |
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An array of maps defining available compression format support. |
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The array is sorted from most preferred to least preferred. |
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Each entry has the following bytestring keys: |
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name |
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Name of the compression engine. e.g. ``zstd`` or ``zlib``. |
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framingmediatypes |
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An array of bytestrings defining the supported framing protocol |
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media types. Servers will not accept media types not in this list. |
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pathfilterprefixes |
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(set of bytestring) Matcher prefixes that are recognized when performing |
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path filtering. Specifying a path filter whose type/prefix does not |
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match one in this set will likely be rejected by the server. |
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rawrepoformats |
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An array of storage formats the repository is using. This set of |
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requirements can be used to determine whether a client can read a |
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*raw* copy of file data available. |
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changesetdata |
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------------- |
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Obtain various data related to changesets. |
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118 |
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The command accepts the following arguments: |
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120 |
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121 |
noderange |
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122 |
(array of arrays of bytestrings) An array of 2 elements, each being an |
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123 |
array of node bytestrings. The first array denotes the changelog revisions |
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124 |
that are already known to the client. The second array denotes the changelog |
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125 |
revision DAG heads to fetch. The argument essentially defines a DAG range |
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bounded by root and head nodes to fetch. |
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127 |
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The roots array may be empty. The heads array must be defined. |
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129 |
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nodes |
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(array of bytestrings) Changelog revisions to request explicitly. |
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fields |
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(set of bytestring) Which data associated with changelog revisions to |
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fetch. The following values are recognized: |
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136 |
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bookmarks |
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Bookmarks associated with a revision. |
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140 |
parents |
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Parent revisions. |
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phase |
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The phase state of a revision. |
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146 |
revision |
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147 |
The raw, revision data for the changelog entry. The hash of this data |
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will match the revision's node value. |
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149 |
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150 |
The server resolves the set of revisions relevant to the request by taking |
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151 |
the union of the ``noderange`` and ``nodes`` arguments. At least one of these |
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arguments must be defined. |
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153 |
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154 |
The response bytestream starts with a CBOR map describing the data that follows. |
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155 |
This map has the following bytestring keys: |
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156 |
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changeset
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157 |
totalitems |
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158 |
(unsigned integer) Total number of changelog revisions whose data is being |
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159 |
transferred. This maps to the set of revisions in the requested node |
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range, not the total number of records that follow (see below for why). |
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161 |
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162 |
Following the map header is a series of 0 or more CBOR values. If values |
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163 |
are present, the first value will always be a map describing a single changeset |
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164 |
revision. If revision data is requested, the raw revision data (encoded as |
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165 |
a CBOR bytestring) will follow the map describing it. Otherwise, another CBOR |
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166 |
map describing the next changeset revision will occur. |
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167 |
|
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168 |
Each map has the following bytestring keys: |
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169 |
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170 |
node |
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171 |
(bytestring) The node value for this revision. This is the SHA-1 hash of |
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172 |
the raw revision data. |
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173 |
|
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174 |
bookmarks (optional) |
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175 |
(array of bytestrings) Bookmarks attached to this revision. Only present |
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176 |
if ``bookmarks`` data is being requested and the revision has bookmarks |
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177 |
attached. |
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178 |
|
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179 |
parents (optional) |
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180 |
(array of bytestrings) The nodes representing the parent revisions of this |
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181 |
revision. Only present if ``parents`` data is being requested. |
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182 |
|
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changeset
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183 |
phase (optional) |
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changeset
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184 |
(bytestring) The phase that a revision is in. Recognized values are |
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185 |
``secret``, ``draft``, and ``public``. Only present if ``phase`` data |
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186 |
is being requested. |
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187 |
|
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changeset
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188 |
revisionsize (optional) |
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changeset
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189 |
(unsigned integer) Indicates the size of raw revision data that follows this |
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changeset
|
190 |
map. The following data contains a serialized form of the changeset data, |
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changeset
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191 |
including the author, date, commit message, set of changed files, manifest |
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changeset
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192 |
node, and other metadata. |
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changeset
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193 |
|
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changeset
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194 |
Only present if ``revision`` data was requested and the data follows this |
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changeset
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195 |
map. |
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changeset
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196 |
|
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changeset
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197 |
If nodes are requested via ``noderange``, they will be emitted in DAG order, |
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198 |
parents always before children. |
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changeset
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199 |
|
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changeset
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200 |
If nodes are requested via ``nodes``, they will be emitted in requested order. |
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changeset
|
201 |
|
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202 |
Nodes from ``nodes`` are emitted before nodes from ``noderange``. |
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changeset
|
203 |
|
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204 |
The set of changeset revisions emitted may not match the exact set of |
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205 |
changesets requested. Furthermore, the set of keys present on each |
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|
206 |
map may vary. This is to facilitate emitting changeset updates as well |
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|
207 |
as new revisions. |
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changeset
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208 |
|
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changeset
|
209 |
For example, if the request wants ``phase`` and ``revision`` data, |
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210 |
the response may contain entries for each changeset in the common nodes |
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211 |
set with the ``phase`` key and without the ``revision`` key in order |
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212 |
to reflect a phase-only update. |
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changeset
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213 |
|
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214 |
TODO support different revision selection mechanisms (e.g. non-public, specific |
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changeset
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215 |
revisions) |
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changeset
|
216 |
TODO support different hash "namespaces" for revisions (e.g. sha-1 versus other) |
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changeset
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217 |
TODO support emitting obsolescence data |
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218 |
TODO support filtering based on relevant paths (narrow clone) |
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|
219 |
TODO support depth limiting |
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220 |
TODO support hgtagsfnodes cache / tags data |
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TODO support branch heads cache |
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filedata |
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224 |
-------- |
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Obtain various data related to an individual tracked file. |
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The command accepts the following arguments: |
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fields |
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(set of bytestring) Which data associated with a file to fetch. |
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The following values are recognized: |
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233 |
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234 |
parents |
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Parent nodes for the revision. |
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236 |
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237 |
revision |
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The raw revision data for a file. |
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239 |
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240 |
haveparents |
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(bool) Whether the client has the parent revisions of all requested |
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nodes. If set, the server may emit revision data as deltas against |
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any parent revision. If not set, the server MUST only emit deltas for |
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revisions previously emitted by this command. |
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False is assumed in the absence of any value. |
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nodes |
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(array of bytestrings) File nodes whose data to retrieve. |
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path |
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(bytestring) Path of the tracked file whose data to retrieve. |
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TODO allow specifying revisions via alternate means (such as from |
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255 |
changeset revisions or ranges) |
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The response bytestream starts with a CBOR map describing the data that |
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follows. It has the following bytestream keys: |
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totalitems |
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(unsigned integer) Total number of file revisions whose data is |
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being returned. |
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263 |
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Following the header map is a series of 0 or more CBOR values. The first |
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value is always a map describing a file revision. If this map has the |
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``deltasize`` or ``revisionsize`` keys, a bytestring containing the delta |
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267 |
or revision, respectively, will immediately follow the map. Otherwise |
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the next value will be a map describing the next file revision. |
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269 |
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270 |
Each map has the following bytestring keys: |
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271 |
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272 |
node |
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273 |
(bytestring) The node of the file revision whose data is represented. |
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274 |
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275 |
deltabasenode |
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276 |
(bytestring) Node of the file revision the following delta is against. |
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277 |
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278 |
Only present if the ``revision`` field is requested and delta data |
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279 |
follows this map. |
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280 |
|
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281 |
deltasize |
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282 |
(unsigned integer) The size of the delta data that follows this map. |
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283 |
|
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284 |
Only present if the ``revision`` field is requested and delta data |
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285 |
follows this map. |
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286 |
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287 |
parents |
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288 |
(array of bytestring) The nodes of the parents of this file revision. |
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289 |
|
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290 |
Only present if the ``parents`` field is requested. |
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291 |
|
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292 |
revisionsize |
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293 |
(unsigned integer) The size of the fulltext revision data that follows |
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294 |
this map. |
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295 |
|
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296 |
Only present if the ``revision`` field is requested and fulltext revision |
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297 |
data follows this map. |
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298 |
|
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299 |
When ``revision`` data is requested, the server chooses to emit either fulltext |
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300 |
revision data or a delta. What the server decides can be inferred by looking |
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301 |
for the presence of the ``deltasize`` or ``revisionsize`` keys in the map. |
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302 |
Servers MUST NOT define both keys. |
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303 |
|
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304 |
heads |
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|
305 |
----- |
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306 |
|
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307 |
Obtain DAG heads in the repository. |
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308 |
|
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309 |
The command accepts the following arguments: |
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310 |
|
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|
311 |
publiconly (optional) |
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312 |
(boolean) If set, operate on the DAG for public phase changesets only. |
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313 |
Non-public (i.e. draft) phase DAG heads will not be returned. |
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314 |
|
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315 |
The response is a CBOR array of bytestrings defining changeset nodes |
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316 |
of DAG heads. The array can be empty if the repository is empty or no |
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317 |
changesets satisfied the request. |
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318 |
|
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319 |
TODO consider exposing phase of heads in response |
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320 |
|
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321 |
known |
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322 |
----- |
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323 |
|
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324 |
Determine whether a series of changeset nodes is known to the server. |
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325 |
|
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326 |
The command accepts the following arguments: |
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327 |
|
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328 |
nodes |
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329 |
(array of bytestrings) List of changeset nodes whose presence to |
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330 |
query. |
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331 |
|
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332 |
The response is a bytestring where each byte contains a 0 or 1 for the |
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|
333 |
corresponding requested node at the same index. |
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|
334 |
|
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|
335 |
TODO use a bit array for even more compact response |
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336 |
|
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|
337 |
listkeys |
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338 |
-------- |
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|
339 |
|
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340 |
List values in a specified ``pushkey`` namespace. |
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|
341 |
|
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|
342 |
The command receives the following arguments: |
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|
343 |
|
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|
344 |
namespace |
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345 |
(bytestring) Pushkey namespace to query. |
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|
346 |
|
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|
347 |
The response is a map with bytestring keys and values. |
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|
348 |
|
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|
349 |
TODO consider using binary to represent nodes in certain pushkey namespaces. |
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|
350 |
|
37538
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|
351 |
lookup |
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|
352 |
------ |
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|
353 |
|
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|
354 |
Try to resolve a value to a changeset revision. |
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|
355 |
|
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|
356 |
Unlike ``known`` which operates on changeset nodes, lookup operates on |
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|
357 |
node fragments and other names that a user may use. |
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|
358 |
|
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|
359 |
The command receives the following arguments: |
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|
360 |
|
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|
361 |
key |
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|
362 |
(bytestring) Value to try to resolve. |
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|
363 |
|
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|
364 |
On success, returns a bytestring containing the resolved node. |
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|
365 |
|
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|
366 |
manifestdata |
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|
367 |
------------ |
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|
368 |
|
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|
369 |
Obtain various data related to manifests (which are lists of files in |
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|
370 |
a revision). |
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|
371 |
|
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|
372 |
The command accepts the following arguments: |
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|
373 |
|
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|
374 |
fields |
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|
375 |
(set of bytestring) Which data associated with manifests to fetch. |
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|
376 |
The following values are recognized: |
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|
377 |
|
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|
378 |
parents |
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|
379 |
Parent nodes for the manifest. |
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|
380 |
|
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|
381 |
revision |
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|
382 |
The raw revision data for the manifest. |
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|
383 |
|
39641
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|
384 |
haveparents |
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|
385 |
(bool) Whether the client has the parent revisions of all requested |
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|
386 |
nodes. If set, the server may emit revision data as deltas against |
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|
387 |
any parent revision. If not set, the server MUST only emit deltas for |
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|
388 |
revisions previously emitted by this command. |
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|
389 |
|
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|
390 |
False is assumed in the absence of any value. |
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|
391 |
|
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|
392 |
nodes |
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|
393 |
(array of bytestring) Manifest nodes whose data to retrieve. |
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|
394 |
|
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|
395 |
tree |
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|
396 |
(bytestring) Path to manifest to retrieve. The empty bytestring represents |
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|
397 |
the root manifest. All other values represent directories/trees within |
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|
398 |
the repository. |
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|
399 |
|
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|
400 |
TODO allow specifying revisions via alternate means (such as from changeset |
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changeset
|
401 |
revisions or ranges) |
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|
402 |
TODO consider recursive expansion of manifests (with path filtering for |
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|
403 |
narrow use cases) |
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|
404 |
|
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|
405 |
The response bytestream starts with a CBOR map describing the data that |
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|
406 |
follows. It has the following bytestring keys: |
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|
407 |
|
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|
408 |
totalitems |
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|
409 |
(unsigned integer) Total number of manifest revisions whose data is |
c7a7c7e844e5
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|
410 |
being returned. |
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|
411 |
|
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changeset
|
412 |
Following the header map is a series of 0 or more CBOR values. The first |
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|
413 |
value is always a map describing a manifest revision. If this map has the |
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|
414 |
``deltasize`` or ``revisionsize`` keys, a bytestring containing the delta |
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|
415 |
or revision, respectively, will immediately follow the map. Otherwise |
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|
416 |
the next value will be a map describing the next manifest revision. |
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changeset
|
417 |
|
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|
418 |
Each map has the following bytestring keys: |
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changeset
|
419 |
|
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|
420 |
node |
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|
421 |
(bytestring) The node of the manifest revision whose data is represented. |
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|
422 |
|
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changeset
|
423 |
deltabasenode |
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changeset
|
424 |
(bytestring) The node that the delta representation of this revision is |
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|
425 |
computed against. Only present if the ``revision`` field is requested and |
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|
426 |
a delta is being emitted. |
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changeset
|
427 |
|
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|
428 |
deltasize |
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|
429 |
(unsigned integer) The size of the delta data that follows this map. |
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|
430 |
Only present if the ``revision`` field is requested and a delta is |
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|
431 |
being emitted. |
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changeset
|
432 |
|
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|
433 |
parents |
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|
434 |
(array of bytestring) The nodes of the parents of this manifest revision. |
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|
435 |
Only present if the ``parents`` field is requested. |
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changeset
|
436 |
|
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|
437 |
revisionsize |
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|
438 |
(unsigned integer) The size of the fulltext revision data that follows |
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|
439 |
this map. Only present if the ``revision`` field is requested and a fulltext |
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|
440 |
revision is being emitted. |
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|
441 |
|
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|
442 |
When ``revision`` data is requested, the server chooses to emit either fulltext |
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changeset
|
443 |
revision data or a delta. What the server decides can be inferred by looking |
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wireprotov2: define and implement "manifestdata" command
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39634
diff
changeset
|
444 |
for the presence of the ``deltasize`` or ``revisionsize`` keys in the map. |
c7a7c7e844e5
wireprotov2: define and implement "manifestdata" command
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39634
diff
changeset
|
445 |
Servers MUST NOT define both keys. |
c7a7c7e844e5
wireprotov2: define and implement "manifestdata" command
Gregory Szorc <gregory.szorc@gmail.com>
parents:
39634
diff
changeset
|
446 |
|
37537
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wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
447 |
pushkey |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
448 |
------- |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
449 |
|
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
450 |
Set a value using the ``pushkey`` protocol. |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
451 |
|
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
452 |
The command receives the following arguments: |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
453 |
|
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
454 |
namespace |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
455 |
(bytestring) Pushkey namespace to operate on. |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
456 |
key |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
457 |
(bytestring) The pushkey key to set. |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
458 |
old |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
459 |
(bytestring) Old value for this key. |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
460 |
new |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
461 |
(bytestring) New value for this key. |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
462 |
|
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
463 |
TODO consider using binary to represent nodes is certain pushkey namespaces. |
be5d4749edc0
wireproto: port pushkey command to wire protocol version 2
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37535
diff
changeset
|
464 |
TODO better define response type and meaning. |