Mercurial > hg
annotate hgext/remotefilelog/remotefilelogserver.py @ 40510:fc2766860796
remotefilelog: consolidate and rename on-disk store requirement
The value of this constant appeared in too many places. While we're
here, rename it to be more consistent with our naming conventions for
experimental functionality.
Differential Revision: https://phab.mercurial-scm.org/D5128
author | Augie Fackler <augie@google.com> |
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date | Tue, 16 Oct 2018 17:02:48 -0400 |
parents | ed19958dbf5d |
children | 466dd4d70bff |
rev | line source |
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1 # remotefilelogserver.py - server logic for a remotefilelog server |
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2 # |
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3 # Copyright 2013 Facebook, Inc. |
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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 from __future__ import absolute_import |
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8 |
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9 import errno |
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10 import os |
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11 import stat |
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12 import time |
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13 import zlib |
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14 |
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15 from mercurial.i18n import _ |
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16 from mercurial.node import bin, hex, nullid |
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17 from mercurial import ( |
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18 changegroup, |
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19 changelog, |
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20 context, |
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21 error, |
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22 extensions, |
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23 match, |
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24 store, |
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25 streamclone, |
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26 util, |
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27 wireprotoserver, |
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28 wireprototypes, |
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29 wireprotov1server, |
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30 ) |
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31 from . import ( |
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32 constants, |
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33 shallowutil, |
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34 ) |
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35 |
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36 _sshv1server = wireprotoserver.sshv1protocolhandler |
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37 |
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38 def setupserver(ui, repo): |
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39 """Sets up a normal Mercurial repo so it can serve files to shallow repos. |
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40 """ |
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41 onetimesetup(ui) |
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42 |
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43 # don't send files to shallow clients during pulls |
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44 def generatefiles(orig, self, changedfiles, linknodes, commonrevs, source, |
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45 *args, **kwargs): |
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46 caps = self._bundlecaps or [] |
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47 if constants.BUNDLE2_CAPABLITY in caps: |
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48 # only send files that don't match the specified patterns |
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49 includepattern = None |
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50 excludepattern = None |
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51 for cap in (self._bundlecaps or []): |
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52 if cap.startswith("includepattern="): |
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53 includepattern = cap[len("includepattern="):].split('\0') |
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54 elif cap.startswith("excludepattern="): |
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55 excludepattern = cap[len("excludepattern="):].split('\0') |
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56 |
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57 m = match.always(repo.root, '') |
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58 if includepattern or excludepattern: |
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59 m = match.match(repo.root, '', None, |
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60 includepattern, excludepattern) |
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61 |
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62 changedfiles = list([f for f in changedfiles if not m(f)]) |
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63 return orig(self, changedfiles, linknodes, commonrevs, source, |
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64 *args, **kwargs) |
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65 |
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66 extensions.wrapfunction( |
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67 changegroup.cgpacker, 'generatefiles', generatefiles) |
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68 |
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69 onetime = False |
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70 def onetimesetup(ui): |
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71 """Configures the wireprotocol for both clients and servers. |
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72 """ |
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73 global onetime |
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74 if onetime: |
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75 return |
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76 onetime = True |
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77 |
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78 # support file content requests |
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79 wireprotov1server.wireprotocommand( |
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80 'getflogheads', 'path', permission='pull')(getflogheads) |
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81 wireprotov1server.wireprotocommand( |
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82 'getfiles', '', permission='pull')(getfiles) |
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83 wireprotov1server.wireprotocommand( |
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84 'getfile', 'file node', permission='pull')(getfile) |
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85 |
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86 class streamstate(object): |
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87 match = None |
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88 shallowremote = False |
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89 noflatmf = False |
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90 state = streamstate() |
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91 |
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92 def stream_out_shallow(repo, proto, other): |
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93 includepattern = None |
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94 excludepattern = None |
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95 raw = other.get('includepattern') |
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96 if raw: |
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97 includepattern = raw.split('\0') |
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98 raw = other.get('excludepattern') |
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99 if raw: |
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100 excludepattern = raw.split('\0') |
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101 |
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102 oldshallow = state.shallowremote |
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103 oldmatch = state.match |
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104 oldnoflatmf = state.noflatmf |
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105 try: |
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106 state.shallowremote = True |
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107 state.match = match.always(repo.root, '') |
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108 state.noflatmf = other.get('noflatmanifest') == 'True' |
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109 if includepattern or excludepattern: |
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110 state.match = match.match(repo.root, '', None, |
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111 includepattern, excludepattern) |
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112 streamres = wireprotov1server.stream(repo, proto) |
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113 |
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114 # Force the first value to execute, so the file list is computed |
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115 # within the try/finally scope |
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116 first = next(streamres.gen) |
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117 second = next(streamres.gen) |
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118 def gen(): |
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119 yield first |
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120 yield second |
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121 for value in streamres.gen: |
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122 yield value |
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123 return wireprototypes.streamres(gen()) |
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124 finally: |
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125 state.shallowremote = oldshallow |
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126 state.match = oldmatch |
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127 state.noflatmf = oldnoflatmf |
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128 |
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129 wireprotov1server.commands['stream_out_shallow'] = (stream_out_shallow, '*') |
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130 |
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131 # don't clone filelogs to shallow clients |
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132 def _walkstreamfiles(orig, repo): |
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133 if state.shallowremote: |
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134 # if we are shallow ourselves, stream our local commits |
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135 if constants.SHALLOWREPO_REQUIREMENT in repo.requirements: |
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136 striplen = len(repo.store.path) + 1 |
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137 readdir = repo.store.rawvfs.readdir |
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138 visit = [os.path.join(repo.store.path, 'data')] |
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139 while visit: |
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140 p = visit.pop() |
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141 for f, kind, st in readdir(p, stat=True): |
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142 fp = p + '/' + f |
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143 if kind == stat.S_IFREG: |
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144 if not fp.endswith('.i') and not fp.endswith('.d'): |
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145 n = util.pconvert(fp[striplen:]) |
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146 yield (store.decodedir(n), n, st.st_size) |
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147 if kind == stat.S_IFDIR: |
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148 visit.append(fp) |
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149 |
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150 if 'treemanifest' in repo.requirements: |
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151 for (u, e, s) in repo.store.datafiles(): |
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152 if (u.startswith('meta/') and |
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153 (u.endswith('.i') or u.endswith('.d'))): |
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154 yield (u, e, s) |
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155 |
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156 # Return .d and .i files that do not match the shallow pattern |
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157 match = state.match |
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158 if match and not match.always(): |
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159 for (u, e, s) in repo.store.datafiles(): |
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160 f = u[5:-2] # trim data/... and .i/.d |
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161 if not state.match(f): |
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162 yield (u, e, s) |
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163 |
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164 for x in repo.store.topfiles(): |
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165 if state.noflatmf and x[0][:11] == '00manifest.': |
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166 continue |
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167 yield x |
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168 |
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169 elif constants.SHALLOWREPO_REQUIREMENT in repo.requirements: |
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170 # don't allow cloning from a shallow repo to a full repo |
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171 # since it would require fetching every version of every |
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172 # file in order to create the revlogs. |
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173 raise error.Abort(_("Cannot clone from a shallow repo " |
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174 "to a full repo.")) |
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175 else: |
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176 for x in orig(repo): |
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177 yield x |
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178 |
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179 extensions.wrapfunction(streamclone, '_walkstreamfiles', _walkstreamfiles) |
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180 |
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181 # We no longer use getbundle_shallow commands, but we must still |
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182 # support it for migration purposes |
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183 def getbundleshallow(repo, proto, others): |
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184 bundlecaps = others.get('bundlecaps', '') |
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185 bundlecaps = set(bundlecaps.split(',')) |
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186 bundlecaps.add(constants.BUNDLE2_CAPABLITY) |
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187 others['bundlecaps'] = ','.join(bundlecaps) |
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188 |
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189 return wireprotov1server.commands["getbundle"][0](repo, proto, others) |
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190 |
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191 wireprotov1server.commands["getbundle_shallow"] = (getbundleshallow, '*') |
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192 |
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193 # expose remotefilelog capabilities |
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194 def _capabilities(orig, repo, proto): |
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195 caps = orig(repo, proto) |
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196 if ((constants.SHALLOWREPO_REQUIREMENT in repo.requirements or |
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197 ui.configbool('remotefilelog', 'server'))): |
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198 if isinstance(proto, _sshv1server): |
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199 # legacy getfiles method which only works over ssh |
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200 caps.append(constants.NETWORK_CAP_LEGACY_SSH_GETFILES) |
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201 caps.append('getflogheads') |
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202 caps.append('getfile') |
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203 return caps |
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204 extensions.wrapfunction(wireprotov1server, '_capabilities', _capabilities) |
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205 |
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206 def _adjustlinkrev(orig, self, *args, **kwargs): |
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207 # When generating file blobs, taking the real path is too slow on large |
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208 # repos, so force it to just return the linkrev directly. |
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209 repo = self._repo |
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210 if util.safehasattr(repo, 'forcelinkrev') and repo.forcelinkrev: |
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211 return self._filelog.linkrev(self._filelog.rev(self._filenode)) |
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212 return orig(self, *args, **kwargs) |
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213 |
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214 extensions.wrapfunction( |
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215 context.basefilectx, '_adjustlinkrev', _adjustlinkrev) |
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216 |
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217 def _iscmd(orig, cmd): |
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218 if cmd == 'getfiles': |
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219 return False |
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220 return orig(cmd) |
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221 |
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222 extensions.wrapfunction(wireprotoserver, 'iscmd', _iscmd) |
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223 |
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224 def _loadfileblob(repo, cachepath, path, node): |
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225 filecachepath = os.path.join(cachepath, path, hex(node)) |
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226 if not os.path.exists(filecachepath) or os.path.getsize(filecachepath) == 0: |
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227 filectx = repo.filectx(path, fileid=node) |
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228 if filectx.node() == nullid: |
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229 repo.changelog = changelog.changelog(repo.svfs) |
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230 filectx = repo.filectx(path, fileid=node) |
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231 |
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232 text = createfileblob(filectx) |
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233 # TODO configurable compression engines |
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234 text = zlib.compress(text) |
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235 |
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236 # everything should be user & group read/writable |
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237 oldumask = os.umask(0o002) |
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238 try: |
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239 dirname = os.path.dirname(filecachepath) |
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240 if not os.path.exists(dirname): |
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241 try: |
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242 os.makedirs(dirname) |
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243 except OSError as ex: |
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244 if ex.errno != errno.EEXIST: |
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245 raise |
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246 |
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247 f = None |
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248 try: |
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249 f = util.atomictempfile(filecachepath, "w") |
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250 f.write(text) |
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251 except (IOError, OSError): |
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252 # Don't abort if the user only has permission to read, |
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253 # and not write. |
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254 pass |
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255 finally: |
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256 if f: |
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257 f.close() |
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258 finally: |
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259 os.umask(oldumask) |
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260 else: |
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261 with open(filecachepath, "r") as f: |
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262 text = f.read() |
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263 return text |
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264 |
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265 def getflogheads(repo, proto, path): |
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266 """A server api for requesting a filelog's heads |
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267 """ |
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268 flog = repo.file(path) |
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269 heads = flog.heads() |
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270 return '\n'.join((hex(head) for head in heads if head != nullid)) |
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271 |
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272 def getfile(repo, proto, file, node): |
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273 """A server api for requesting a particular version of a file. Can be used |
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274 in batches to request many files at once. The return protocol is: |
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275 <errorcode>\0<data/errormsg> where <errorcode> is 0 for success or |
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276 non-zero for an error. |
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277 |
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278 data is a compressed blob with revlog flag and ancestors information. See |
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279 createfileblob for its content. |
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280 """ |
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281 if constants.SHALLOWREPO_REQUIREMENT in repo.requirements: |
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282 return '1\0' + _('cannot fetch remote files from shallow repo') |
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283 cachepath = repo.ui.config("remotefilelog", "servercachepath") |
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284 if not cachepath: |
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285 cachepath = os.path.join(repo.path, "remotefilelogcache") |
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286 node = bin(node.strip()) |
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287 if node == nullid: |
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288 return '0\0' |
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289 return '0\0' + _loadfileblob(repo, cachepath, file, node) |
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290 |
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291 def getfiles(repo, proto): |
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292 """A server api for requesting particular versions of particular files. |
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293 """ |
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294 if constants.SHALLOWREPO_REQUIREMENT in repo.requirements: |
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295 raise error.Abort(_('cannot fetch remote files from shallow repo')) |
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296 if not isinstance(proto, _sshv1server): |
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297 raise error.Abort(_('cannot fetch remote files over non-ssh protocol')) |
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298 |
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299 def streamer(): |
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300 fin = proto._fin |
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301 |
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302 cachepath = repo.ui.config("remotefilelog", "servercachepath") |
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303 if not cachepath: |
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304 cachepath = os.path.join(repo.path, "remotefilelogcache") |
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305 |
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306 while True: |
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307 request = fin.readline()[:-1] |
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308 if not request: |
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309 break |
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310 |
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311 node = bin(request[:40]) |
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312 if node == nullid: |
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313 yield '0\n' |
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314 continue |
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315 |
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316 path = request[40:] |
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317 |
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318 text = _loadfileblob(repo, cachepath, path, node) |
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319 |
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320 yield '%d\n%s' % (len(text), text) |
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321 |
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322 # it would be better to only flush after processing a whole batch |
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323 # but currently we don't know if there are more requests coming |
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324 proto._fout.flush() |
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325 return wireprototypes.streamres(streamer()) |
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326 |
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327 def createfileblob(filectx): |
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328 """ |
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329 format: |
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330 v0: |
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331 str(len(rawtext)) + '\0' + rawtext + ancestortext |
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332 v1: |
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333 'v1' + '\n' + metalist + '\0' + rawtext + ancestortext |
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334 metalist := metalist + '\n' + meta | meta |
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335 meta := sizemeta | flagmeta |
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336 sizemeta := METAKEYSIZE + str(len(rawtext)) |
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337 flagmeta := METAKEYFLAG + str(flag) |
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338 |
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339 note: sizemeta must exist. METAKEYFLAG and METAKEYSIZE must have a |
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340 length of 1. |
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341 """ |
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342 flog = filectx.filelog() |
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343 frev = filectx.filerev() |
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344 revlogflags = flog._revlog.flags(frev) |
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345 if revlogflags == 0: |
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346 # normal files |
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347 text = filectx.data() |
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348 else: |
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349 # lfs, read raw revision data |
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350 text = flog.revision(frev, raw=True) |
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351 |
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352 repo = filectx._repo |
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353 |
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354 ancestors = [filectx] |
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355 |
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356 try: |
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357 repo.forcelinkrev = True |
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358 ancestors.extend([f for f in filectx.ancestors()]) |
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359 |
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360 ancestortext = "" |
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361 for ancestorctx in ancestors: |
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362 parents = ancestorctx.parents() |
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363 p1 = nullid |
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364 p2 = nullid |
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365 if len(parents) > 0: |
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366 p1 = parents[0].filenode() |
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367 if len(parents) > 1: |
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368 p2 = parents[1].filenode() |
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369 |
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370 copyname = "" |
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371 rename = ancestorctx.renamed() |
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372 if rename: |
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373 copyname = rename[0] |
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374 linknode = ancestorctx.node() |
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375 ancestortext += "%s%s%s%s%s\0" % ( |
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376 ancestorctx.filenode(), p1, p2, linknode, |
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377 copyname) |
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378 finally: |
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379 repo.forcelinkrev = False |
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380 |
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381 header = shallowutil.buildfileblobheader(len(text), revlogflags) |
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382 |
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383 return "%s\0%s%s" % (header, text, ancestortext) |
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384 |
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385 def gcserver(ui, repo): |
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386 if not repo.ui.configbool("remotefilelog", "server"): |
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387 return |
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388 |
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389 neededfiles = set() |
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390 heads = repo.revs("heads(tip~25000:) - null") |
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391 |
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392 cachepath = repo.vfs.join("remotefilelogcache") |
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393 for head in heads: |
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394 mf = repo[head].manifest() |
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395 for filename, filenode in mf.iteritems(): |
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396 filecachepath = os.path.join(cachepath, filename, hex(filenode)) |
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397 neededfiles.add(filecachepath) |
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398 |
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399 # delete unneeded older files |
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400 days = repo.ui.configint("remotefilelog", "serverexpiration") |
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401 expiration = time.time() - (days * 24 * 60 * 60) |
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402 |
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403 _removing = _("removing old server cache") |
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404 count = 0 |
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405 ui.progress(_removing, count, unit="files") |
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406 for root, dirs, files in os.walk(cachepath): |
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407 for file in files: |
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408 filepath = os.path.join(root, file) |
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409 count += 1 |
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410 ui.progress(_removing, count, unit="files") |
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411 if filepath in neededfiles: |
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412 continue |
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413 |
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414 stat = os.stat(filepath) |
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415 if stat.st_mtime < expiration: |
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416 os.remove(filepath) |
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417 |
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418 ui.progress(_removing, None) |