Mercurial > hg
annotate mercurial/streamclone.py @ 36809:3c15b84ab66c
hgweb: teach WSGI parser about query strings
Currently, req.form uses cgi.parse() to populate form data. Depending
on the request, form data can come from POST multipart/form-data,
application/x-www-form-urlencoded, or the URL query string.
Putting all these things into one data structure makes it difficult
to reason about how exactly parameters got to the request. It can
lead to wonkiness such as pulling parameters from both the URL and
POST data.
This commit teaches our WSGI request parser about argument data
in query strings. We populate fields containing the query string
data and only the query string data so it can't be confused with
POST data.
Differential Revision: https://phab.mercurial-scm.org/D2737
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 08 Mar 2018 11:21:46 -0800 |
parents | 2d3e486d09d0 |
children | 65b86ee69383 |
rev | line source |
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1 # streamclone.py - producing and consuming streaming repository data |
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2 # |
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3 # Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 |
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8 from __future__ import absolute_import |
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9 |
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10 import contextlib |
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11 import os |
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12 import struct |
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13 import tempfile |
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14 import warnings |
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15 |
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16 from .i18n import _ |
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17 from . import ( |
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18 branchmap, |
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19 cacheutil, |
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20 error, |
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21 phases, |
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22 store, |
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23 util, |
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24 ) |
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25 |
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26 def canperformstreamclone(pullop, bundle2=False): |
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27 """Whether it is possible to perform a streaming clone as part of pull. |
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28 |
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29 ``bundle2`` will cause the function to consider stream clone through |
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30 bundle2 and only through bundle2. |
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31 |
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32 Returns a tuple of (supported, requirements). ``supported`` is True if |
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33 streaming clone is supported and False otherwise. ``requirements`` is |
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34 a set of repo requirements from the remote, or ``None`` if stream clone |
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35 isn't supported. |
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36 """ |
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37 repo = pullop.repo |
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38 remote = pullop.remote |
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39 |
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40 bundle2supported = False |
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41 if pullop.canusebundle2: |
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42 if 'v2' in pullop.remotebundle2caps.get('stream', []): |
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43 bundle2supported = True |
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44 # else |
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45 # Server doesn't support bundle2 stream clone or doesn't support |
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46 # the versions we support. Fall back and possibly allow legacy. |
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47 |
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48 # Ensures legacy code path uses available bundle2. |
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49 if bundle2supported and not bundle2: |
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50 return False, None |
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51 # Ensures bundle2 doesn't try to do a stream clone if it isn't supported. |
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52 elif bundle2 and not bundle2supported: |
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53 return False, None |
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54 |
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55 # Streaming clone only works on empty repositories. |
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56 if len(repo): |
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57 return False, None |
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58 |
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59 # Streaming clone only works if all data is being requested. |
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60 if pullop.heads: |
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61 return False, None |
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62 |
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63 streamrequested = pullop.streamclonerequested |
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64 |
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65 # If we don't have a preference, let the server decide for us. This |
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66 # likely only comes into play in LANs. |
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67 if streamrequested is None: |
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68 # The server can advertise whether to prefer streaming clone. |
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69 streamrequested = remote.capable('stream-preferred') |
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70 |
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71 if not streamrequested: |
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72 return False, None |
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73 |
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74 # In order for stream clone to work, the client has to support all the |
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75 # requirements advertised by the server. |
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76 # |
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77 # The server advertises its requirements via the "stream" and "streamreqs" |
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78 # capability. "stream" (a value-less capability) is advertised if and only |
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79 # if the only requirement is "revlogv1." Else, the "streamreqs" capability |
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80 # is advertised and contains a comma-delimited list of requirements. |
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81 requirements = set() |
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82 if remote.capable('stream'): |
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83 requirements.add('revlogv1') |
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84 else: |
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85 streamreqs = remote.capable('streamreqs') |
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86 # This is weird and shouldn't happen with modern servers. |
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87 if not streamreqs: |
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88 pullop.repo.ui.warn(_( |
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89 'warning: stream clone requested but server has them ' |
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90 'disabled\n')) |
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91 return False, None |
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92 |
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93 streamreqs = set(streamreqs.split(',')) |
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94 # Server requires something we don't support. Bail. |
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95 missingreqs = streamreqs - repo.supportedformats |
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96 if missingreqs: |
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97 pullop.repo.ui.warn(_( |
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98 'warning: stream clone requested but client is missing ' |
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99 'requirements: %s\n') % ', '.join(sorted(missingreqs))) |
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100 pullop.repo.ui.warn( |
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101 _('(see https://www.mercurial-scm.org/wiki/MissingRequirement ' |
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102 'for more information)\n')) |
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103 return False, None |
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104 requirements = streamreqs |
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105 |
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106 return True, requirements |
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107 |
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108 def maybeperformlegacystreamclone(pullop): |
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109 """Possibly perform a legacy stream clone operation. |
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110 |
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111 Legacy stream clones are performed as part of pull but before all other |
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112 operations. |
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113 |
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114 A legacy stream clone will not be performed if a bundle2 stream clone is |
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115 supported. |
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116 """ |
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117 supported, requirements = canperformstreamclone(pullop) |
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118 |
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119 if not supported: |
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120 return |
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121 |
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122 repo = pullop.repo |
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123 remote = pullop.remote |
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124 |
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125 # Save remote branchmap. We will use it later to speed up branchcache |
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126 # creation. |
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127 rbranchmap = None |
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128 if remote.capable('branchmap'): |
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129 rbranchmap = remote.branchmap() |
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130 |
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131 repo.ui.status(_('streaming all changes\n')) |
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132 |
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133 fp = remote.stream_out() |
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134 l = fp.readline() |
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135 try: |
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136 resp = int(l) |
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137 except ValueError: |
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138 raise error.ResponseError( |
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139 _('unexpected response from remote server:'), l) |
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140 if resp == 1: |
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141 raise error.Abort(_('operation forbidden by server')) |
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142 elif resp == 2: |
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143 raise error.Abort(_('locking the remote repository failed')) |
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144 elif resp != 0: |
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145 raise error.Abort(_('the server sent an unknown error code')) |
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146 |
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147 l = fp.readline() |
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148 try: |
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149 filecount, bytecount = map(int, l.split(' ', 1)) |
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150 except (ValueError, TypeError): |
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151 raise error.ResponseError( |
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152 _('unexpected response from remote server:'), l) |
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153 |
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154 with repo.lock(): |
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155 consumev1(repo, fp, filecount, bytecount) |
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156 |
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157 # new requirements = old non-format requirements + |
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158 # new format-related remote requirements |
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159 # requirements from the streamed-in repository |
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160 repo.requirements = requirements | ( |
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161 repo.requirements - repo.supportedformats) |
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162 repo._applyopenerreqs() |
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163 repo._writerequirements() |
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164 |
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165 if rbranchmap: |
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166 branchmap.replacecache(repo, rbranchmap) |
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167 |
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168 repo.invalidate() |
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169 |
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170 def allowservergeneration(repo): |
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171 """Whether streaming clones are allowed from the server.""" |
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172 if not repo.ui.configbool('server', 'uncompressed', untrusted=True): |
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173 return False |
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174 |
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175 # The way stream clone works makes it impossible to hide secret changesets. |
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176 # So don't allow this by default. |
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177 secret = phases.hassecret(repo) |
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178 if secret: |
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179 return repo.ui.configbool('server', 'uncompressedallowsecret') |
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180 |
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181 return True |
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182 |
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183 # This is it's own function so extensions can override it. |
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184 def _walkstreamfiles(repo): |
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185 return repo.store.walk() |
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186 |
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187 def generatev1(repo): |
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188 """Emit content for version 1 of a streaming clone. |
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189 |
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190 This returns a 3-tuple of (file count, byte size, data iterator). |
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191 |
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192 The data iterator consists of N entries for each file being transferred. |
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193 Each file entry starts as a line with the file name and integer size |
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194 delimited by a null byte. |
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195 |
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196 The raw file data follows. Following the raw file data is the next file |
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197 entry, or EOF. |
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198 |
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199 When used on the wire protocol, an additional line indicating protocol |
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200 success will be prepended to the stream. This function is not responsible |
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201 for adding it. |
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202 |
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203 This function will obtain a repository lock to ensure a consistent view of |
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204 the store is captured. It therefore may raise LockError. |
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205 """ |
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206 entries = [] |
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207 total_bytes = 0 |
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208 # Get consistent snapshot of repo, lock during scan. |
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209 with repo.lock(): |
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210 repo.ui.debug('scanning\n') |
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211 for name, ename, size in _walkstreamfiles(repo): |
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212 if size: |
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213 entries.append((name, size)) |
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214 total_bytes += size |
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215 |
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216 repo.ui.debug('%d files, %d bytes to transfer\n' % |
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217 (len(entries), total_bytes)) |
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218 |
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219 svfs = repo.svfs |
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220 debugflag = repo.ui.debugflag |
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221 |
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222 def emitrevlogdata(): |
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223 for name, size in entries: |
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224 if debugflag: |
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225 repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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226 # partially encode name over the wire for backwards compat |
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227 yield '%s\0%d\n' % (store.encodedir(name), size) |
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228 # auditing at this stage is both pointless (paths are already |
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229 # trusted by the local repo) and expensive |
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230 with svfs(name, 'rb', auditpath=False) as fp: |
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231 if size <= 65536: |
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232 yield fp.read(size) |
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233 else: |
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234 for chunk in util.filechunkiter(fp, limit=size): |
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235 yield chunk |
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236 |
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237 return len(entries), total_bytes, emitrevlogdata() |
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238 |
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239 def generatev1wireproto(repo): |
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240 """Emit content for version 1 of streaming clone suitable for the wire. |
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241 |
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242 This is the data output from ``generatev1()`` with 2 header lines. The |
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243 first line indicates overall success. The 2nd contains the file count and |
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244 byte size of payload. |
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245 |
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246 The success line contains "0" for success, "1" for stream generation not |
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247 allowed, and "2" for error locking the repository (possibly indicating |
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248 a permissions error for the server process). |
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249 """ |
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250 if not allowservergeneration(repo): |
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251 yield '1\n' |
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252 return |
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253 |
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254 try: |
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255 filecount, bytecount, it = generatev1(repo) |
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256 except error.LockError: |
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257 yield '2\n' |
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258 return |
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259 |
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260 # Indicates successful response. |
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261 yield '0\n' |
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262 yield '%d %d\n' % (filecount, bytecount) |
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263 for chunk in it: |
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264 yield chunk |
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265 |
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266 def generatebundlev1(repo, compression='UN'): |
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267 """Emit content for version 1 of a stream clone bundle. |
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268 |
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269 The first 4 bytes of the output ("HGS1") denote this as stream clone |
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270 bundle version 1. |
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271 |
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272 The next 2 bytes indicate the compression type. Only "UN" is currently |
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273 supported. |
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274 |
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275 The next 16 bytes are two 64-bit big endian unsigned integers indicating |
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276 file count and byte count, respectively. |
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277 |
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278 The next 2 bytes is a 16-bit big endian unsigned short declaring the length |
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279 of the requirements string, including a trailing \0. The following N bytes |
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280 are the requirements string, which is ASCII containing a comma-delimited |
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281 list of repo requirements that are needed to support the data. |
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282 |
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283 The remaining content is the output of ``generatev1()`` (which may be |
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284 compressed in the future). |
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285 |
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286 Returns a tuple of (requirements, data generator). |
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287 """ |
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288 if compression != 'UN': |
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289 raise ValueError('we do not support the compression argument yet') |
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290 |
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291 requirements = repo.requirements & repo.supportedformats |
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292 requires = ','.join(sorted(requirements)) |
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293 |
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294 def gen(): |
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295 yield 'HGS1' |
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296 yield compression |
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297 |
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298 filecount, bytecount, it = generatev1(repo) |
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299 repo.ui.status(_('writing %d bytes for %d files\n') % |
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300 (bytecount, filecount)) |
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301 |
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302 yield struct.pack('>QQ', filecount, bytecount) |
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303 yield struct.pack('>H', len(requires) + 1) |
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304 yield requires + '\0' |
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305 |
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306 # This is where we'll add compression in the future. |
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307 assert compression == 'UN' |
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308 |
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309 seen = 0 |
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310 repo.ui.progress(_('bundle'), 0, total=bytecount, unit=_('bytes')) |
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311 |
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312 for chunk in it: |
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313 seen += len(chunk) |
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314 repo.ui.progress(_('bundle'), seen, total=bytecount, |
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315 unit=_('bytes')) |
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316 yield chunk |
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317 |
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318 repo.ui.progress(_('bundle'), None) |
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319 |
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320 return requirements, gen() |
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321 |
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322 def consumev1(repo, fp, filecount, bytecount): |
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323 """Apply the contents from version 1 of a streaming clone file handle. |
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324 |
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325 This takes the output from "stream_out" and applies it to the specified |
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326 repository. |
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327 |
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328 Like "stream_out," the status line added by the wire protocol is not |
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329 handled by this function. |
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330 """ |
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331 with repo.lock(): |
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332 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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333 (filecount, util.bytecount(bytecount))) |
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334 handled_bytes = 0 |
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335 repo.ui.progress(_('clone'), 0, total=bytecount, unit=_('bytes')) |
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336 start = util.timer() |
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337 |
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338 # TODO: get rid of (potential) inconsistency |
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339 # |
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340 # If transaction is started and any @filecache property is |
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341 # changed at this point, it causes inconsistency between |
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342 # in-memory cached property and streamclone-ed file on the |
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343 # disk. Nested transaction prevents transaction scope "clone" |
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344 # below from writing in-memory changes out at the end of it, |
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345 # even though in-memory changes are discarded at the end of it |
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346 # regardless of transaction nesting. |
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347 # |
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348 # But transaction nesting can't be simply prohibited, because |
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349 # nesting occurs also in ordinary case (e.g. enabling |
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350 # clonebundles). |
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351 |
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352 with repo.transaction('clone'): |
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353 with repo.svfs.backgroundclosing(repo.ui, expectedcount=filecount): |
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354 for i in xrange(filecount): |
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355 # XXX doesn't support '\n' or '\r' in filenames |
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356 l = fp.readline() |
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357 try: |
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358 name, size = l.split('\0', 1) |
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359 size = int(size) |
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360 except (ValueError, TypeError): |
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361 raise error.ResponseError( |
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362 _('unexpected response from remote server:'), l) |
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363 if repo.ui.debugflag: |
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364 repo.ui.debug('adding %s (%s)\n' % |
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365 (name, util.bytecount(size))) |
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366 # for backwards compat, name was partially encoded |
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367 path = store.decodedir(name) |
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368 with repo.svfs(path, 'w', backgroundclose=True) as ofp: |
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369 for chunk in util.filechunkiter(fp, limit=size): |
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370 handled_bytes += len(chunk) |
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371 repo.ui.progress(_('clone'), handled_bytes, |
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372 total=bytecount, unit=_('bytes')) |
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373 ofp.write(chunk) |
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374 |
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375 # force @filecache properties to be reloaded from |
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376 # streamclone-ed file at next access |
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377 repo.invalidate(clearfilecache=True) |
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378 |
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379 elapsed = util.timer() - start |
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380 if elapsed <= 0: |
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381 elapsed = 0.001 |
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382 repo.ui.progress(_('clone'), None) |
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383 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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384 (util.bytecount(bytecount), elapsed, |
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385 util.bytecount(bytecount / elapsed))) |
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386 |
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387 def readbundle1header(fp): |
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388 compression = fp.read(2) |
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389 if compression != 'UN': |
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390 raise error.Abort(_('only uncompressed stream clone bundles are ' |
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391 'supported; got %s') % compression) |
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392 |
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393 filecount, bytecount = struct.unpack('>QQ', fp.read(16)) |
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394 requireslen = struct.unpack('>H', fp.read(2))[0] |
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395 requires = fp.read(requireslen) |
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396 |
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397 if not requires.endswith('\0'): |
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398 raise error.Abort(_('malformed stream clone bundle: ' |
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399 'requirements not properly encoded')) |
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400 |
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401 requirements = set(requires.rstrip('\0').split(',')) |
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402 |
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403 return filecount, bytecount, requirements |
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404 |
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405 def applybundlev1(repo, fp): |
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406 """Apply the content from a stream clone bundle version 1. |
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407 |
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408 We assume the 4 byte header has been read and validated and the file handle |
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409 is at the 2 byte compression identifier. |
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410 """ |
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411 if len(repo): |
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412 raise error.Abort(_('cannot apply stream clone bundle on non-empty ' |
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413 'repo')) |
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414 |
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415 filecount, bytecount, requirements = readbundle1header(fp) |
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416 missingreqs = requirements - repo.supportedformats |
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417 if missingreqs: |
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418 raise error.Abort(_('unable to apply stream clone: ' |
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419 'unsupported format: %s') % |
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420 ', '.join(sorted(missingreqs))) |
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421 |
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422 consumev1(repo, fp, filecount, bytecount) |
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423 |
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424 class streamcloneapplier(object): |
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425 """Class to manage applying streaming clone bundles. |
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426 |
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427 We need to wrap ``applybundlev1()`` in a dedicated type to enable bundle |
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428 readers to perform bundle type-specific functionality. |
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429 """ |
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430 def __init__(self, fh): |
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431 self._fh = fh |
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432 |
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433 def apply(self, repo): |
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434 return applybundlev1(repo, self._fh) |
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435 |
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436 # type of file to stream |
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437 _fileappend = 0 # append only file |
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438 _filefull = 1 # full snapshot file |
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439 |
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440 # Source of the file |
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441 _srcstore = 's' # store (svfs) |
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442 _srccache = 'c' # cache (cache) |
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443 |
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444 # This is it's own function so extensions can override it. |
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445 def _walkstreamfullstorefiles(repo): |
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446 """list snapshot file from the store""" |
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447 fnames = [] |
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448 if not repo.publishing(): |
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449 fnames.append('phaseroots') |
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450 return fnames |
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451 |
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452 def _filterfull(entry, copy, vfsmap): |
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453 """actually copy the snapshot files""" |
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454 src, name, ftype, data = entry |
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455 if ftype != _filefull: |
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456 return entry |
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457 return (src, name, ftype, copy(vfsmap[src].join(name))) |
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458 |
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459 @contextlib.contextmanager |
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460 def maketempcopies(): |
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461 """return a function to temporary copy file""" |
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462 files = [] |
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463 try: |
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464 def copy(src): |
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465 fd, dst = tempfile.mkstemp() |
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466 os.close(fd) |
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467 files.append(dst) |
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468 util.copyfiles(src, dst, hardlink=True) |
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469 return dst |
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470 yield copy |
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471 finally: |
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472 for tmp in files: |
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473 util.tryunlink(tmp) |
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474 |
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475 def _makemap(repo): |
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476 """make a (src -> vfs) map for the repo""" |
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477 vfsmap = { |
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478 _srcstore: repo.svfs, |
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479 _srccache: repo.cachevfs, |
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480 } |
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481 # we keep repo.vfs out of the on purpose, ther are too many danger there |
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482 # (eg: .hg/hgrc) |
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483 assert repo.vfs not in vfsmap.values() |
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484 |
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485 return vfsmap |
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486 |
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487 def _emit2(repo, entries, totalfilesize): |
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488 """actually emit the stream bundle""" |
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489 vfsmap = _makemap(repo) |
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490 progress = repo.ui.progress |
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491 progress(_('bundle'), 0, total=totalfilesize, unit=_('bytes')) |
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492 with maketempcopies() as copy: |
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493 try: |
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494 # copy is delayed until we are in the try |
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495 entries = [_filterfull(e, copy, vfsmap) for e in entries] |
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496 yield None # this release the lock on the repository |
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497 seen = 0 |
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498 |
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499 for src, name, ftype, data in entries: |
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500 vfs = vfsmap[src] |
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501 yield src |
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502 yield util.uvarintencode(len(name)) |
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503 if ftype == _fileappend: |
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504 fp = vfs(name) |
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505 size = data |
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506 elif ftype == _filefull: |
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507 fp = open(data, 'rb') |
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508 size = util.fstat(fp).st_size |
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509 try: |
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510 yield util.uvarintencode(size) |
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511 yield name |
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512 if size <= 65536: |
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513 chunks = (fp.read(size),) |
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514 else: |
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515 chunks = util.filechunkiter(fp, limit=size) |
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516 for chunk in chunks: |
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517 seen += len(chunk) |
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518 progress(_('bundle'), seen, total=totalfilesize, |
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519 unit=_('bytes')) |
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520 yield chunk |
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521 finally: |
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522 fp.close() |
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523 finally: |
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524 progress(_('bundle'), None) |
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525 |
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526 def generatev2(repo): |
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527 """Emit content for version 2 of a streaming clone. |
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528 |
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529 the data stream consists the following entries: |
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530 1) A char representing the file destination (eg: store or cache) |
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531 2) A varint containing the length of the filename |
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532 3) A varint containing the length of file data |
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533 4) N bytes containing the filename (the internal, store-agnostic form) |
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534 5) N bytes containing the file data |
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535 |
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536 Returns a 3-tuple of (file count, file size, data iterator). |
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537 """ |
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538 |
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539 with repo.lock(): |
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540 |
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541 entries = [] |
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542 totalfilesize = 0 |
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543 |
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544 repo.ui.debug('scanning\n') |
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545 for name, ename, size in _walkstreamfiles(repo): |
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546 if size: |
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547 entries.append((_srcstore, name, _fileappend, size)) |
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548 totalfilesize += size |
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549 for name in _walkstreamfullstorefiles(repo): |
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550 if repo.svfs.exists(name): |
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551 totalfilesize += repo.svfs.lstat(name).st_size |
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552 entries.append((_srcstore, name, _filefull, None)) |
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553 for name in cacheutil.cachetocopy(repo): |
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554 if repo.cachevfs.exists(name): |
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555 totalfilesize += repo.cachevfs.lstat(name).st_size |
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556 entries.append((_srccache, name, _filefull, None)) |
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557 |
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558 chunks = _emit2(repo, entries, totalfilesize) |
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559 first = next(chunks) |
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560 assert first is None |
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561 |
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562 return len(entries), totalfilesize, chunks |
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563 |
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564 @contextlib.contextmanager |
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565 def nested(*ctxs): |
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566 with warnings.catch_warnings(): |
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567 # For some reason, Python decided 'nested' was deprecated without |
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568 # replacement. They officially advertised for filtering the deprecation |
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569 # warning for people who actually need the feature. |
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570 warnings.filterwarnings("ignore",category=DeprecationWarning) |
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571 with contextlib.nested(*ctxs): |
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572 yield |
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573 |
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574 def consumev2(repo, fp, filecount, filesize): |
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575 """Apply the contents from a version 2 streaming clone. |
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576 |
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577 Data is read from an object that only needs to provide a ``read(size)`` |
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578 method. |
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579 """ |
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580 with repo.lock(): |
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581 repo.ui.status(_('%d files to transfer, %s of data\n') % |
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582 (filecount, util.bytecount(filesize))) |
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583 |
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584 start = util.timer() |
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585 handledbytes = 0 |
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586 progress = repo.ui.progress |
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587 |
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588 progress(_('clone'), handledbytes, total=filesize, unit=_('bytes')) |
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589 |
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590 vfsmap = _makemap(repo) |
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591 |
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592 with repo.transaction('clone'): |
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593 ctxs = (vfs.backgroundclosing(repo.ui) |
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594 for vfs in vfsmap.values()) |
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595 with nested(*ctxs): |
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596 for i in range(filecount): |
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597 src = util.readexactly(fp, 1) |
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598 vfs = vfsmap[src] |
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599 namelen = util.uvarintdecodestream(fp) |
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600 datalen = util.uvarintdecodestream(fp) |
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601 |
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602 name = util.readexactly(fp, namelen) |
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603 |
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604 if repo.ui.debugflag: |
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605 repo.ui.debug('adding [%s] %s (%s)\n' % |
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606 (src, name, util.bytecount(datalen))) |
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607 |
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608 with vfs(name, 'w') as ofp: |
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609 for chunk in util.filechunkiter(fp, limit=datalen): |
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610 handledbytes += len(chunk) |
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611 progress(_('clone'), handledbytes, total=filesize, |
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612 unit=_('bytes')) |
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613 ofp.write(chunk) |
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614 |
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615 # force @filecache properties to be reloaded from |
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616 # streamclone-ed file at next access |
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617 repo.invalidate(clearfilecache=True) |
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618 |
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619 elapsed = util.timer() - start |
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620 if elapsed <= 0: |
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621 elapsed = 0.001 |
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622 progress(_('clone'), None) |
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623 repo.ui.status(_('transferred %s in %.1f seconds (%s/sec)\n') % |
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624 (util.bytecount(handledbytes), elapsed, |
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625 util.bytecount(handledbytes / elapsed))) |
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626 |
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627 def applybundlev2(repo, fp, filecount, filesize, requirements): |
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628 missingreqs = [r for r in requirements if r not in repo.supported] |
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629 if missingreqs: |
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630 raise error.Abort(_('unable to apply stream clone: ' |
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631 'unsupported format: %s') % |
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632 ', '.join(sorted(missingreqs))) |
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633 |
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634 consumev2(repo, fp, filecount, filesize) |
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635 |
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636 # new requirements = old non-format requirements + |
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637 # new format-related remote requirements |
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638 # requirements from the streamed-in repository |
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639 repo.requirements = set(requirements) | ( |
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640 repo.requirements - repo.supportedformats) |
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641 repo._applyopenerreqs() |
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642 repo._writerequirements() |