Mercurial > hg
annotate hgext/remotefilelog/remotefilelogserver.py @ 40509:ed19958dbf5d
remotefilelog: consolidate and rename bundle2 capability
Bonus: we catch a spot where the shallowrepo requirement was being
misused as the bundle2 capability.
Differential Revision: https://phab.mercurial-scm.org/D5127
author | Augie Fackler <augie@google.com> |
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date | Tue, 16 Oct 2018 17:30:47 -0400 |
parents | 354acd0dc637 |
children | fc2766860796 |
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 shallowrepo, |
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34 shallowutil, |
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35 ) |
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36 |
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37 _sshv1server = wireprotoserver.sshv1protocolhandler |
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38 |
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39 def setupserver(ui, repo): |
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40 """Sets up a normal Mercurial repo so it can serve files to shallow repos. |
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41 """ |
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42 onetimesetup(ui) |
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43 |
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44 # don't send files to shallow clients during pulls |
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45 def generatefiles(orig, self, changedfiles, linknodes, commonrevs, source, |
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46 *args, **kwargs): |
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47 caps = self._bundlecaps or [] |
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48 if constants.BUNDLE2_CAPABLITY in caps: |
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49 # only send files that don't match the specified patterns |
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50 includepattern = None |
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51 excludepattern = None |
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52 for cap in (self._bundlecaps or []): |
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53 if cap.startswith("includepattern="): |
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54 includepattern = cap[len("includepattern="):].split('\0') |
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55 elif cap.startswith("excludepattern="): |
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56 excludepattern = cap[len("excludepattern="):].split('\0') |
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57 |
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58 m = match.always(repo.root, '') |
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59 if includepattern or excludepattern: |
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60 m = match.match(repo.root, '', None, |
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61 includepattern, excludepattern) |
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62 |
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63 changedfiles = list([f for f in changedfiles if not m(f)]) |
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64 return orig(self, changedfiles, linknodes, commonrevs, source, |
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65 *args, **kwargs) |
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66 |
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67 extensions.wrapfunction( |
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68 changegroup.cgpacker, 'generatefiles', generatefiles) |
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69 |
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70 onetime = False |
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71 def onetimesetup(ui): |
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72 """Configures the wireprotocol for both clients and servers. |
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73 """ |
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74 global onetime |
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75 if onetime: |
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76 return |
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77 onetime = True |
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78 |
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79 # support file content requests |
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80 wireprotov1server.wireprotocommand( |
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81 'getflogheads', 'path', permission='pull')(getflogheads) |
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82 wireprotov1server.wireprotocommand( |
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83 'getfiles', '', permission='pull')(getfiles) |
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84 wireprotov1server.wireprotocommand( |
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85 'getfile', 'file node', permission='pull')(getfile) |
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86 |
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87 class streamstate(object): |
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88 match = None |
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89 shallowremote = False |
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90 noflatmf = False |
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91 state = streamstate() |
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92 |
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93 def stream_out_shallow(repo, proto, other): |
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94 includepattern = None |
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95 excludepattern = None |
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96 raw = other.get('includepattern') |
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97 if raw: |
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98 includepattern = raw.split('\0') |
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99 raw = other.get('excludepattern') |
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100 if raw: |
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101 excludepattern = raw.split('\0') |
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102 |
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103 oldshallow = state.shallowremote |
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104 oldmatch = state.match |
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105 oldnoflatmf = state.noflatmf |
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106 try: |
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107 state.shallowremote = True |
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108 state.match = match.always(repo.root, '') |
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109 state.noflatmf = other.get('noflatmanifest') == 'True' |
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110 if includepattern or excludepattern: |
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111 state.match = match.match(repo.root, '', None, |
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112 includepattern, excludepattern) |
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113 streamres = wireprotov1server.stream(repo, proto) |
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114 |
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115 # Force the first value to execute, so the file list is computed |
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116 # within the try/finally scope |
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117 first = next(streamres.gen) |
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118 second = next(streamres.gen) |
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119 def gen(): |
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120 yield first |
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121 yield second |
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122 for value in streamres.gen: |
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123 yield value |
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124 return wireprototypes.streamres(gen()) |
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125 finally: |
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126 state.shallowremote = oldshallow |
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127 state.match = oldmatch |
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128 state.noflatmf = oldnoflatmf |
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129 |
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130 wireprotov1server.commands['stream_out_shallow'] = (stream_out_shallow, '*') |
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131 |
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132 # don't clone filelogs to shallow clients |
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133 def _walkstreamfiles(orig, repo): |
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134 if state.shallowremote: |
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135 # if we are shallow ourselves, stream our local commits |
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136 if shallowrepo.requirement in repo.requirements: |
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137 striplen = len(repo.store.path) + 1 |
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138 readdir = repo.store.rawvfs.readdir |
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139 visit = [os.path.join(repo.store.path, 'data')] |
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140 while visit: |
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141 p = visit.pop() |
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142 for f, kind, st in readdir(p, stat=True): |
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143 fp = p + '/' + f |
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144 if kind == stat.S_IFREG: |
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145 if not fp.endswith('.i') and not fp.endswith('.d'): |
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146 n = util.pconvert(fp[striplen:]) |
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147 yield (store.decodedir(n), n, st.st_size) |
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148 if kind == stat.S_IFDIR: |
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149 visit.append(fp) |
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150 |
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151 if 'treemanifest' in repo.requirements: |
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152 for (u, e, s) in repo.store.datafiles(): |
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153 if (u.startswith('meta/') and |
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154 (u.endswith('.i') or u.endswith('.d'))): |
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155 yield (u, e, s) |
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156 |
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157 # Return .d and .i files that do not match the shallow pattern |
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158 match = state.match |
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159 if match and not match.always(): |
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160 for (u, e, s) in repo.store.datafiles(): |
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161 f = u[5:-2] # trim data/... and .i/.d |
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162 if not state.match(f): |
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163 yield (u, e, s) |
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164 |
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165 for x in repo.store.topfiles(): |
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166 if state.noflatmf and x[0][:11] == '00manifest.': |
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167 continue |
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168 yield x |
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169 |
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170 elif shallowrepo.requirement in repo.requirements: |
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171 # don't allow cloning from a shallow repo to a full repo |
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172 # since it would require fetching every version of every |
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173 # file in order to create the revlogs. |
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174 raise error.Abort(_("Cannot clone from a shallow repo " |
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175 "to a full repo.")) |
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176 else: |
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177 for x in orig(repo): |
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178 yield x |
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179 |
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180 extensions.wrapfunction(streamclone, '_walkstreamfiles', _walkstreamfiles) |
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181 |
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182 # We no longer use getbundle_shallow commands, but we must still |
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183 # support it for migration purposes |
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184 def getbundleshallow(repo, proto, others): |
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185 bundlecaps = others.get('bundlecaps', '') |
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186 bundlecaps = set(bundlecaps.split(',')) |
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187 bundlecaps.add(constants.BUNDLE2_CAPABLITY) |
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188 others['bundlecaps'] = ','.join(bundlecaps) |
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189 |
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190 return wireprotov1server.commands["getbundle"][0](repo, proto, others) |
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191 |
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192 wireprotov1server.commands["getbundle_shallow"] = (getbundleshallow, '*') |
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193 |
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194 # expose remotefilelog capabilities |
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195 def _capabilities(orig, repo, proto): |
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196 caps = orig(repo, proto) |
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197 if ((shallowrepo.requirement in repo.requirements or |
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198 ui.configbool('remotefilelog', 'server'))): |
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199 if isinstance(proto, _sshv1server): |
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200 # legacy getfiles method which only works over ssh |
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201 caps.append(constants.NETWORK_CAP_LEGACY_SSH_GETFILES) |
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202 caps.append('getflogheads') |
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203 caps.append('getfile') |
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204 return caps |
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205 extensions.wrapfunction(wireprotov1server, '_capabilities', _capabilities) |
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206 |
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207 def _adjustlinkrev(orig, self, *args, **kwargs): |
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208 # When generating file blobs, taking the real path is too slow on large |
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209 # repos, so force it to just return the linkrev directly. |
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210 repo = self._repo |
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211 if util.safehasattr(repo, 'forcelinkrev') and repo.forcelinkrev: |
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212 return self._filelog.linkrev(self._filelog.rev(self._filenode)) |
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213 return orig(self, *args, **kwargs) |
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214 |
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215 extensions.wrapfunction( |
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216 context.basefilectx, '_adjustlinkrev', _adjustlinkrev) |
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217 |
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218 def _iscmd(orig, cmd): |
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219 if cmd == 'getfiles': |
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220 return False |
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221 return orig(cmd) |
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222 |
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223 extensions.wrapfunction(wireprotoserver, 'iscmd', _iscmd) |
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224 |
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225 def _loadfileblob(repo, cachepath, path, node): |
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226 filecachepath = os.path.join(cachepath, path, hex(node)) |
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227 if not os.path.exists(filecachepath) or os.path.getsize(filecachepath) == 0: |
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228 filectx = repo.filectx(path, fileid=node) |
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229 if filectx.node() == nullid: |
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230 repo.changelog = changelog.changelog(repo.svfs) |
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231 filectx = repo.filectx(path, fileid=node) |
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232 |
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233 text = createfileblob(filectx) |
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234 # TODO configurable compression engines |
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235 text = zlib.compress(text) |
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236 |
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237 # everything should be user & group read/writable |
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238 oldumask = os.umask(0o002) |
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239 try: |
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240 dirname = os.path.dirname(filecachepath) |
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241 if not os.path.exists(dirname): |
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242 try: |
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243 os.makedirs(dirname) |
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244 except OSError as ex: |
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245 if ex.errno != errno.EEXIST: |
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246 raise |
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247 |
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248 f = None |
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249 try: |
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250 f = util.atomictempfile(filecachepath, "w") |
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251 f.write(text) |
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252 except (IOError, OSError): |
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253 # Don't abort if the user only has permission to read, |
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254 # and not write. |
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255 pass |
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256 finally: |
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257 if f: |
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258 f.close() |
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259 finally: |
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260 os.umask(oldumask) |
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261 else: |
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262 with open(filecachepath, "r") as f: |
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263 text = f.read() |
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264 return text |
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265 |
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266 def getflogheads(repo, proto, path): |
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267 """A server api for requesting a filelog's heads |
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268 """ |
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269 flog = repo.file(path) |
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270 heads = flog.heads() |
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271 return '\n'.join((hex(head) for head in heads if head != nullid)) |
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272 |
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273 def getfile(repo, proto, file, node): |
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274 """A server api for requesting a particular version of a file. Can be used |
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275 in batches to request many files at once. The return protocol is: |
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276 <errorcode>\0<data/errormsg> where <errorcode> is 0 for success or |
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277 non-zero for an error. |
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278 |
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279 data is a compressed blob with revlog flag and ancestors information. See |
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280 createfileblob for its content. |
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281 """ |
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282 if shallowrepo.requirement in repo.requirements: |
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283 return '1\0' + _('cannot fetch remote files from shallow repo') |
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284 cachepath = repo.ui.config("remotefilelog", "servercachepath") |
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285 if not cachepath: |
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286 cachepath = os.path.join(repo.path, "remotefilelogcache") |
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287 node = bin(node.strip()) |
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288 if node == nullid: |
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289 return '0\0' |
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290 return '0\0' + _loadfileblob(repo, cachepath, file, node) |
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291 |
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292 def getfiles(repo, proto): |
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293 """A server api for requesting particular versions of particular files. |
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294 """ |
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295 if shallowrepo.requirement in repo.requirements: |
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296 raise error.Abort(_('cannot fetch remote files from shallow repo')) |
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297 if not isinstance(proto, _sshv1server): |
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298 raise error.Abort(_('cannot fetch remote files over non-ssh protocol')) |
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299 |
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300 def streamer(): |
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301 fin = proto._fin |
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302 |
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303 cachepath = repo.ui.config("remotefilelog", "servercachepath") |
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304 if not cachepath: |
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305 cachepath = os.path.join(repo.path, "remotefilelogcache") |
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306 |
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307 while True: |
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308 request = fin.readline()[:-1] |
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309 if not request: |
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310 break |
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311 |
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312 node = bin(request[:40]) |
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313 if node == nullid: |
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314 yield '0\n' |
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315 continue |
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316 |
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317 path = request[40:] |
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318 |
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319 text = _loadfileblob(repo, cachepath, path, node) |
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320 |
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321 yield '%d\n%s' % (len(text), text) |
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322 |
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323 # it would be better to only flush after processing a whole batch |
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324 # but currently we don't know if there are more requests coming |
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325 proto._fout.flush() |
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326 return wireprototypes.streamres(streamer()) |
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327 |
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328 def createfileblob(filectx): |
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329 """ |
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330 format: |
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331 v0: |
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332 str(len(rawtext)) + '\0' + rawtext + ancestortext |
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333 v1: |
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334 'v1' + '\n' + metalist + '\0' + rawtext + ancestortext |
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335 metalist := metalist + '\n' + meta | meta |
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336 meta := sizemeta | flagmeta |
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337 sizemeta := METAKEYSIZE + str(len(rawtext)) |
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338 flagmeta := METAKEYFLAG + str(flag) |
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339 |
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340 note: sizemeta must exist. METAKEYFLAG and METAKEYSIZE must have a |
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341 length of 1. |
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342 """ |
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343 flog = filectx.filelog() |
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344 frev = filectx.filerev() |
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345 revlogflags = flog._revlog.flags(frev) |
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346 if revlogflags == 0: |
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347 # normal files |
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348 text = filectx.data() |
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349 else: |
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350 # lfs, read raw revision data |
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351 text = flog.revision(frev, raw=True) |
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352 |
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353 repo = filectx._repo |
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354 |
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355 ancestors = [filectx] |
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356 |
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357 try: |
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358 repo.forcelinkrev = True |
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359 ancestors.extend([f for f in filectx.ancestors()]) |
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360 |
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361 ancestortext = "" |
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362 for ancestorctx in ancestors: |
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363 parents = ancestorctx.parents() |
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364 p1 = nullid |
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365 p2 = nullid |
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366 if len(parents) > 0: |
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367 p1 = parents[0].filenode() |
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368 if len(parents) > 1: |
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369 p2 = parents[1].filenode() |
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370 |
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371 copyname = "" |
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372 rename = ancestorctx.renamed() |
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373 if rename: |
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374 copyname = rename[0] |
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375 linknode = ancestorctx.node() |
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376 ancestortext += "%s%s%s%s%s\0" % ( |
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377 ancestorctx.filenode(), p1, p2, linknode, |
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378 copyname) |
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379 finally: |
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380 repo.forcelinkrev = False |
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381 |
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382 header = shallowutil.buildfileblobheader(len(text), revlogflags) |
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383 |
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384 return "%s\0%s%s" % (header, text, ancestortext) |
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385 |
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386 def gcserver(ui, repo): |
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387 if not repo.ui.configbool("remotefilelog", "server"): |
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388 return |
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389 |
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390 neededfiles = set() |
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391 heads = repo.revs("heads(tip~25000:) - null") |
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392 |
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393 cachepath = repo.vfs.join("remotefilelogcache") |
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394 for head in heads: |
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395 mf = repo[head].manifest() |
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396 for filename, filenode in mf.iteritems(): |
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397 filecachepath = os.path.join(cachepath, filename, hex(filenode)) |
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398 neededfiles.add(filecachepath) |
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399 |
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400 # delete unneeded older files |
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401 days = repo.ui.configint("remotefilelog", "serverexpiration") |
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402 expiration = time.time() - (days * 24 * 60 * 60) |
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403 |
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404 _removing = _("removing old server cache") |
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405 count = 0 |
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406 ui.progress(_removing, count, unit="files") |
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407 for root, dirs, files in os.walk(cachepath): |
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408 for file in files: |
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409 filepath = os.path.join(root, file) |
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410 count += 1 |
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411 ui.progress(_removing, count, unit="files") |
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412 if filepath in neededfiles: |
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413 continue |
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414 |
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415 stat = os.stat(filepath) |
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416 if stat.st_mtime < expiration: |
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417 os.remove(filepath) |
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418 |
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419 ui.progress(_removing, None) |