Mercurial > hg
annotate hgext/remotefilelog/basestore.py @ 43076:2372284d9457
formatting: blacken the codebase
This is using my patch to black
(https://github.com/psf/black/pull/826) so we don't un-wrap collection
literals.
Done with:
hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S
# skip-blame mass-reformatting only
# no-check-commit reformats foo_bar functions
Differential Revision: https://phab.mercurial-scm.org/D6971
author | Augie Fackler <augie@google.com> |
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date | Sun, 06 Oct 2019 09:45:02 -0400 |
parents | 13dad5cb4b99 |
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1 from __future__ import absolute_import |
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2 |
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3 import errno |
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4 import hashlib |
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5 import os |
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6 import shutil |
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7 import stat |
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8 import time |
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9 |
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10 from mercurial.i18n import _ |
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11 from mercurial.node import bin, hex |
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12 from mercurial import ( |
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13 error, |
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14 pycompat, |
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15 util, |
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16 ) |
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17 from . import ( |
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18 constants, |
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19 shallowutil, |
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20 ) |
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21 |
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22 |
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23 class basestore(object): |
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24 def __init__(self, repo, path, reponame, shared=False): |
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25 """Creates a remotefilelog store object for the given repo name. |
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26 |
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27 `path` - The file path where this store keeps its data |
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28 `reponame` - The name of the repo. This is used to partition data from |
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29 many repos. |
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30 `shared` - True if this store is a shared cache of data from the central |
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31 server, for many repos on this machine. False means this store is for |
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32 the local data for one repo. |
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33 """ |
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34 self.repo = repo |
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35 self.ui = repo.ui |
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36 self._path = path |
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37 self._reponame = reponame |
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38 self._shared = shared |
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39 self._uid = os.getuid() if not pycompat.iswindows else None |
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40 |
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41 self._validatecachelog = self.ui.config( |
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42 "remotefilelog", "validatecachelog" |
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43 ) |
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44 self._validatecache = self.ui.config( |
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45 "remotefilelog", "validatecache", 'on' |
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46 ) |
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47 if self._validatecache not in ('on', 'strict', 'off'): |
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48 self._validatecache = 'on' |
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49 if self._validatecache == 'off': |
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50 self._validatecache = False |
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51 |
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52 if shared: |
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53 shallowutil.mkstickygroupdir(self.ui, path) |
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54 |
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55 def getmissing(self, keys): |
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56 missing = [] |
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57 for name, node in keys: |
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58 filepath = self._getfilepath(name, node) |
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59 exists = os.path.exists(filepath) |
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60 if ( |
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61 exists |
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62 and self._validatecache == 'strict' |
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63 and not self._validatekey(filepath, 'contains') |
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64 ): |
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65 exists = False |
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66 if not exists: |
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67 missing.append((name, node)) |
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68 |
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69 return missing |
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70 |
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71 # BELOW THIS ARE IMPLEMENTATIONS OF REPACK SOURCE |
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72 |
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73 def markledger(self, ledger, options=None): |
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74 if options and options.get(constants.OPTION_PACKSONLY): |
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75 return |
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76 if self._shared: |
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77 for filename, nodes in self._getfiles(): |
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78 for node in nodes: |
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79 ledger.markdataentry(self, filename, node) |
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80 ledger.markhistoryentry(self, filename, node) |
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81 |
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82 def cleanup(self, ledger): |
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83 ui = self.ui |
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84 entries = ledger.sources.get(self, []) |
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85 count = 0 |
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86 progress = ui.makeprogress( |
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87 _("cleaning up"), unit="files", total=len(entries) |
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88 ) |
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89 for entry in entries: |
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90 if entry.gced or (entry.datarepacked and entry.historyrepacked): |
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91 progress.update(count) |
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92 path = self._getfilepath(entry.filename, entry.node) |
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93 util.tryunlink(path) |
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94 count += 1 |
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95 progress.complete() |
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96 |
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97 # Clean up the repo cache directory. |
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98 self._cleanupdirectory(self._getrepocachepath()) |
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99 |
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100 # BELOW THIS ARE NON-STANDARD APIS |
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101 |
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102 def _cleanupdirectory(self, rootdir): |
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103 """Removes the empty directories and unnecessary files within the root |
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104 directory recursively. Note that this method does not remove the root |
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105 directory itself. """ |
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106 |
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107 oldfiles = set() |
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108 otherfiles = set() |
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109 # osutil.listdir returns stat information which saves some rmdir/listdir |
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110 # syscalls. |
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111 for name, mode in util.osutil.listdir(rootdir): |
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112 if stat.S_ISDIR(mode): |
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113 dirpath = os.path.join(rootdir, name) |
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114 self._cleanupdirectory(dirpath) |
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115 |
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116 # Now that the directory specified by dirpath is potentially |
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117 # empty, try and remove it. |
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118 try: |
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119 os.rmdir(dirpath) |
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120 except OSError: |
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121 pass |
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122 |
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123 elif stat.S_ISREG(mode): |
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124 if name.endswith('_old'): |
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125 oldfiles.add(name[:-4]) |
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126 else: |
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127 otherfiles.add(name) |
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128 |
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129 # Remove the files which end with suffix '_old' and have no |
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130 # corresponding file without the suffix '_old'. See addremotefilelognode |
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131 # method for the generation/purpose of files with '_old' suffix. |
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132 for filename in oldfiles - otherfiles: |
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133 filepath = os.path.join(rootdir, filename + '_old') |
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134 util.tryunlink(filepath) |
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135 |
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136 def _getfiles(self): |
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137 """Return a list of (filename, [node,...]) for all the revisions that |
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138 exist in the store. |
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139 |
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140 This is useful for obtaining a list of all the contents of the store |
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141 when performing a repack to another store, since the store API requires |
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142 name+node keys and not namehash+node keys. |
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143 """ |
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144 existing = {} |
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145 for filenamehash, node in self._listkeys(): |
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146 existing.setdefault(filenamehash, []).append(node) |
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147 |
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148 filenamemap = self._resolvefilenames(existing.keys()) |
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149 |
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150 for filename, sha in filenamemap.iteritems(): |
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151 yield (filename, existing[sha]) |
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152 |
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153 def _resolvefilenames(self, hashes): |
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154 """Given a list of filename hashes that are present in the |
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155 remotefilelog store, return a mapping from filename->hash. |
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156 |
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157 This is useful when converting remotefilelog blobs into other storage |
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158 formats. |
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159 """ |
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160 if not hashes: |
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161 return {} |
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162 |
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163 filenames = {} |
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164 missingfilename = set(hashes) |
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165 |
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166 # Start with a full manifest, since it'll cover the majority of files |
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167 for filename in self.repo['tip'].manifest(): |
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168 sha = hashlib.sha1(filename).digest() |
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169 if sha in missingfilename: |
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170 filenames[filename] = sha |
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171 missingfilename.discard(sha) |
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172 |
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173 # Scan the changelog until we've found every file name |
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174 cl = self.repo.unfiltered().changelog |
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175 for rev in pycompat.xrange(len(cl) - 1, -1, -1): |
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176 if not missingfilename: |
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177 break |
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178 files = cl.readfiles(cl.node(rev)) |
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179 for filename in files: |
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180 sha = hashlib.sha1(filename).digest() |
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181 if sha in missingfilename: |
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182 filenames[filename] = sha |
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183 missingfilename.discard(sha) |
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184 |
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185 return filenames |
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186 |
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187 def _getrepocachepath(self): |
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188 return ( |
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189 os.path.join(self._path, self._reponame) |
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190 if self._shared |
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191 else self._path |
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192 ) |
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193 |
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194 def _listkeys(self): |
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195 """List all the remotefilelog keys that exist in the store. |
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196 |
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197 Returns a iterator of (filename hash, filecontent hash) tuples. |
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198 """ |
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199 |
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200 for root, dirs, files in os.walk(self._getrepocachepath()): |
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201 for filename in files: |
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202 if len(filename) != 40: |
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203 continue |
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204 node = filename |
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205 if self._shared: |
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206 # .../1a/85ffda..be21 |
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207 filenamehash = root[-41:-39] + root[-38:] |
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208 else: |
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209 filenamehash = root[-40:] |
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210 yield (bin(filenamehash), bin(node)) |
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211 |
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212 def _getfilepath(self, name, node): |
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213 node = hex(node) |
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214 if self._shared: |
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215 key = shallowutil.getcachekey(self._reponame, name, node) |
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216 else: |
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217 key = shallowutil.getlocalkey(name, node) |
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218 |
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219 return os.path.join(self._path, key) |
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220 |
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221 def _getdata(self, name, node): |
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222 filepath = self._getfilepath(name, node) |
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223 try: |
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224 data = shallowutil.readfile(filepath) |
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225 if self._validatecache and not self._validatedata(data, filepath): |
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226 if self._validatecachelog: |
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227 with open(self._validatecachelog, 'a+') as f: |
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228 f.write("corrupt %s during read\n" % filepath) |
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229 os.rename(filepath, filepath + ".corrupt") |
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230 raise KeyError("corrupt local cache file %s" % filepath) |
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231 except IOError: |
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232 raise KeyError( |
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233 "no file found at %s for %s:%s" % (filepath, name, hex(node)) |
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234 ) |
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235 |
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236 return data |
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237 |
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238 def addremotefilelognode(self, name, node, data): |
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239 filepath = self._getfilepath(name, node) |
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240 |
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241 oldumask = os.umask(0o002) |
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242 try: |
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243 # if this node already exists, save the old version for |
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244 # recovery/debugging purposes. |
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245 if os.path.exists(filepath): |
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246 newfilename = filepath + '_old' |
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247 # newfilename can be read-only and shutil.copy will fail. |
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248 # Delete newfilename to avoid it |
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249 if os.path.exists(newfilename): |
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250 shallowutil.unlinkfile(newfilename) |
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251 shutil.copy(filepath, newfilename) |
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252 |
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253 shallowutil.mkstickygroupdir(self.ui, os.path.dirname(filepath)) |
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254 shallowutil.writefile(filepath, data, readonly=True) |
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255 |
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256 if self._validatecache: |
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257 if not self._validatekey(filepath, 'write'): |
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258 raise error.Abort( |
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259 _("local cache write was corrupted %s") % filepath |
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260 ) |
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261 finally: |
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262 os.umask(oldumask) |
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263 |
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264 def markrepo(self, path): |
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265 """Call this to add the given repo path to the store's list of |
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266 repositories that are using it. This is useful later when doing garbage |
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267 collection, since it allows us to insecpt the repos to see what nodes |
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268 they want to be kept alive in the store. |
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269 """ |
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270 repospath = os.path.join(self._path, "repos") |
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271 with open(repospath, 'ab') as reposfile: |
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272 reposfile.write(os.path.dirname(path) + "\n") |
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273 |
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274 repospathstat = os.stat(repospath) |
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275 if repospathstat.st_uid == self._uid: |
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276 os.chmod(repospath, 0o0664) |
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277 |
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278 def _validatekey(self, path, action): |
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279 with open(path, 'rb') as f: |
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280 data = f.read() |
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281 |
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282 if self._validatedata(data, path): |
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283 return True |
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284 |
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285 if self._validatecachelog: |
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286 with open(self._validatecachelog, 'ab+') as f: |
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287 f.write("corrupt %s during %s\n" % (path, action)) |
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288 |
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289 os.rename(path, path + ".corrupt") |
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290 return False |
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291 |
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292 def _validatedata(self, data, path): |
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293 try: |
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294 if len(data) > 0: |
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295 # see remotefilelogserver.createfileblob for the format |
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296 offset, size, flags = shallowutil.parsesizeflags(data) |
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297 if len(data) <= size: |
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298 # it is truncated |
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299 return False |
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300 |
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301 # extract the node from the metadata |
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302 offset += size |
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303 datanode = data[offset : offset + 20] |
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304 |
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305 # and compare against the path |
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306 if os.path.basename(path) == hex(datanode): |
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307 # Content matches the intended path |
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308 return True |
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309 return False |
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310 except (ValueError, RuntimeError): |
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311 pass |
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312 |
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313 return False |
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314 |
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315 def gc(self, keepkeys): |
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316 ui = self.ui |
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317 cachepath = self._path |
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318 |
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319 # prune cache |
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320 queue = pycompat.queue.PriorityQueue() |
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321 originalsize = 0 |
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322 size = 0 |
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323 count = 0 |
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324 removed = 0 |
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325 |
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326 # keep files newer than a day even if they aren't needed |
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327 limit = time.time() - (60 * 60 * 24) |
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328 |
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329 progress = ui.makeprogress( |
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330 _("removing unnecessary files"), unit="files" |
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331 ) |
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332 progress.update(0) |
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333 for root, dirs, files in os.walk(cachepath): |
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334 for file in files: |
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335 if file == 'repos': |
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336 continue |
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337 |
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338 # Don't delete pack files |
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339 if '/packs/' in root: |
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340 continue |
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341 |
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342 progress.update(count) |
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343 path = os.path.join(root, file) |
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344 key = os.path.relpath(path, cachepath) |
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345 count += 1 |
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346 try: |
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347 pathstat = os.stat(path) |
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348 except OSError as e: |
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349 # errno.ENOENT = no such file or directory |
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350 if e.errno != errno.ENOENT: |
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351 raise |
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352 msg = _("warning: file %s was removed by another process\n") |
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353 ui.warn(msg % path) |
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354 continue |
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355 |
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356 originalsize += pathstat.st_size |
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357 |
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358 if key in keepkeys or pathstat.st_atime > limit: |
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359 queue.put((pathstat.st_atime, path, pathstat)) |
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360 size += pathstat.st_size |
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361 else: |
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362 try: |
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363 shallowutil.unlinkfile(path) |
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364 except OSError as e: |
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365 # errno.ENOENT = no such file or directory |
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366 if e.errno != errno.ENOENT: |
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367 raise |
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368 msg = _( |
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369 "warning: file %s was removed by another " |
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370 "process\n" |
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371 ) |
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372 ui.warn(msg % path) |
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373 continue |
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374 removed += 1 |
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375 progress.complete() |
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376 |
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377 # remove oldest files until under limit |
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378 limit = ui.configbytes("remotefilelog", "cachelimit") |
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379 if size > limit: |
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380 excess = size - limit |
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381 progress = ui.makeprogress( |
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382 _("enforcing cache limit"), unit="bytes", total=excess |
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383 ) |
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384 removedexcess = 0 |
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385 while queue and size > limit and size > 0: |
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386 progress.update(removedexcess) |
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387 atime, oldpath, oldpathstat = queue.get() |
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388 try: |
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389 shallowutil.unlinkfile(oldpath) |
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390 except OSError as e: |
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391 # errno.ENOENT = no such file or directory |
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392 if e.errno != errno.ENOENT: |
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393 raise |
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394 msg = _("warning: file %s was removed by another process\n") |
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395 ui.warn(msg % oldpath) |
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396 size -= oldpathstat.st_size |
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397 removed += 1 |
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398 removedexcess += oldpathstat.st_size |
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399 progress.complete() |
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400 |
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401 ui.status( |
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402 _("finished: removed %d of %d files (%0.2f GB to %0.2f GB)\n") |
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403 % ( |
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404 removed, |
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405 count, |
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406 float(originalsize) / 1024.0 / 1024.0 / 1024.0, |
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407 float(size) / 1024.0 / 1024.0 / 1024.0, |
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408 ) |
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409 ) |
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410 |
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411 |
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412 class baseunionstore(object): |
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413 def __init__(self, *args, **kwargs): |
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414 # If one of the functions that iterates all of the stores is about to |
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415 # throw a KeyError, try this many times with a full refresh between |
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416 # attempts. A repack operation may have moved data from one store to |
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417 # another while we were running. |
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418 self.numattempts = kwargs.get(r'numretries', 0) + 1 |
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419 # If not-None, call this function on every retry and if the attempts are |
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420 # exhausted. |
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421 self.retrylog = kwargs.get(r'retrylog', None) |
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422 |
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423 def markforrefresh(self): |
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424 for store in self.stores: |
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425 if util.safehasattr(store, 'markforrefresh'): |
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426 store.markforrefresh() |
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427 |
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428 @staticmethod |
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429 def retriable(fn): |
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430 def noop(*args): |
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431 pass |
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432 |
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433 def wrapped(self, *args, **kwargs): |
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434 retrylog = self.retrylog or noop |
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435 funcname = fn.__name__ |
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436 i = 0 |
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437 while i < self.numattempts: |
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438 if i > 0: |
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439 retrylog('re-attempting (n=%d) %s\n' % (i, funcname)) |
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440 self.markforrefresh() |
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441 i += 1 |
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442 try: |
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443 return fn(self, *args, **kwargs) |
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444 except KeyError: |
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445 if i == self.numattempts: |
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446 # retries exhausted |
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447 retrylog( |
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448 'retries exhausted in %s, raising KeyError\n' |
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449 % pycompat.sysbytes(funcname) |
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450 ) |
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451 raise |
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452 |
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453 return wrapped |