Mercurial > hg
annotate mercurial/vfs.py @ 37135:ecac0006b90e
localrepo: move featuresetupfuncs out of localrepository class (API)
I want to establish an interface for local repositories.
featuresetupfuncs is a class attribute and is global/shared across all
localrepository instances. Let's move it to a module-level attribute
to clarify it isn't part of the local repository interface.
.. api::
localrepo.localrepository.featuresetupfuncs has been renamed to
localrepo.featuresetupfuncs.
Differential Revision: https://phab.mercurial-scm.org/D2925
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 20 Mar 2018 17:30:30 -0700 |
parents | 2a7e777c9eed |
children | 8fb9985382be |
rev | line source |
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vfs: extract 'vfs' class and related code to a new 'vfs' module (API)
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1 # vfs.py - Mercurial 'vfs' classes |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 from __future__ import absolute_import |
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8 |
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9 import contextlib |
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10 import errno |
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11 import os |
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12 import shutil |
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13 import stat |
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14 import tempfile |
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15 import threading |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 pathutil, |
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22 pycompat, |
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23 util, |
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24 ) |
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25 |
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26 def _avoidambig(path, oldstat): |
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27 """Avoid file stat ambiguity forcibly |
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28 |
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29 This function causes copying ``path`` file, if it is owned by |
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30 another (see issue5418 and issue5584 for detail). |
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31 """ |
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32 def checkandavoid(): |
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33 newstat = util.filestat.frompath(path) |
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34 # return whether file stat ambiguity is (already) avoided |
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35 return (not newstat.isambig(oldstat) or |
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36 newstat.avoidambig(path, oldstat)) |
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37 if not checkandavoid(): |
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38 # simply copy to change owner of path to get privilege to |
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39 # advance mtime (see issue5418) |
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40 util.rename(util.mktempcopy(path), path) |
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41 checkandavoid() |
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42 |
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43 class abstractvfs(object): |
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44 """Abstract base class; cannot be instantiated""" |
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45 |
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46 def __init__(self, *args, **kwargs): |
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47 '''Prevent instantiation; don't call this from subclasses.''' |
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48 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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49 |
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50 def tryread(self, path): |
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51 '''gracefully return an empty string for missing files''' |
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52 try: |
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53 return self.read(path) |
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54 except IOError as inst: |
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55 if inst.errno != errno.ENOENT: |
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56 raise |
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57 return "" |
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58 |
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59 def tryreadlines(self, path, mode='rb'): |
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60 '''gracefully return an empty array for missing files''' |
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61 try: |
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62 return self.readlines(path, mode=mode) |
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63 except IOError as inst: |
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64 if inst.errno != errno.ENOENT: |
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65 raise |
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66 return [] |
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67 |
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68 @util.propertycache |
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69 def open(self): |
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70 '''Open ``path`` file, which is relative to vfs root. |
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71 |
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72 Newly created directories are marked as "not to be indexed by |
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73 the content indexing service", if ``notindexed`` is specified |
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74 for "write" mode access. |
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75 ''' |
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76 return self.__call__ |
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77 |
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78 def read(self, path): |
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79 with self(path, 'rb') as fp: |
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80 return fp.read() |
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81 |
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82 def readlines(self, path, mode='rb'): |
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83 with self(path, mode=mode) as fp: |
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84 return fp.readlines() |
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85 |
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86 def write(self, path, data, backgroundclose=False, **kwargs): |
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87 with self(path, 'wb', backgroundclose=backgroundclose, **kwargs) as fp: |
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88 return fp.write(data) |
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89 |
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90 def writelines(self, path, data, mode='wb', notindexed=False): |
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91 with self(path, mode=mode, notindexed=notindexed) as fp: |
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92 return fp.writelines(data) |
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93 |
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94 def append(self, path, data): |
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95 with self(path, 'ab') as fp: |
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96 return fp.write(data) |
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97 |
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98 def basename(self, path): |
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99 """return base element of a path (as os.path.basename would do) |
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100 |
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101 This exists to allow handling of strange encoding if needed.""" |
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102 return os.path.basename(path) |
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103 |
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104 def chmod(self, path, mode): |
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105 return os.chmod(self.join(path), mode) |
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106 |
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107 def dirname(self, path): |
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108 """return dirname element of a path (as os.path.dirname would do) |
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109 |
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110 This exists to allow handling of strange encoding if needed.""" |
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111 return os.path.dirname(path) |
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112 |
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113 def exists(self, path=None): |
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114 return os.path.exists(self.join(path)) |
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115 |
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116 def fstat(self, fp): |
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117 return util.fstat(fp) |
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118 |
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119 def isdir(self, path=None): |
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120 return os.path.isdir(self.join(path)) |
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121 |
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122 def isfile(self, path=None): |
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123 return os.path.isfile(self.join(path)) |
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124 |
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125 def islink(self, path=None): |
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126 return os.path.islink(self.join(path)) |
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127 |
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128 def isfileorlink(self, path=None): |
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129 '''return whether path is a regular file or a symlink |
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130 |
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131 Unlike isfile, this doesn't follow symlinks.''' |
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132 try: |
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133 st = self.lstat(path) |
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134 except OSError: |
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135 return False |
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136 mode = st.st_mode |
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137 return stat.S_ISREG(mode) or stat.S_ISLNK(mode) |
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138 |
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139 def reljoin(self, *paths): |
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140 """join various elements of a path together (as os.path.join would do) |
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141 |
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142 The vfs base is not injected so that path stay relative. This exists |
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143 to allow handling of strange encoding if needed.""" |
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144 return os.path.join(*paths) |
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145 |
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146 def split(self, path): |
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147 """split top-most element of a path (as os.path.split would do) |
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148 |
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149 This exists to allow handling of strange encoding if needed.""" |
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150 return os.path.split(path) |
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151 |
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152 def lexists(self, path=None): |
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153 return os.path.lexists(self.join(path)) |
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154 |
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155 def lstat(self, path=None): |
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156 return os.lstat(self.join(path)) |
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157 |
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158 def listdir(self, path=None): |
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159 return os.listdir(self.join(path)) |
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160 |
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161 def makedir(self, path=None, notindexed=True): |
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162 return util.makedir(self.join(path), notindexed) |
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163 |
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164 def makedirs(self, path=None, mode=None): |
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165 return util.makedirs(self.join(path), mode) |
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166 |
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167 def makelock(self, info, path): |
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168 return util.makelock(info, self.join(path)) |
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169 |
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170 def mkdir(self, path=None): |
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171 return os.mkdir(self.join(path)) |
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172 |
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173 def mkstemp(self, suffix='', prefix='tmp', dir=None): |
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174 fd, name = tempfile.mkstemp(suffix=suffix, prefix=prefix, |
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175 dir=self.join(dir)) |
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176 dname, fname = util.split(name) |
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177 if dir: |
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178 return fd, os.path.join(dir, fname) |
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179 else: |
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180 return fd, fname |
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181 |
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182 def readdir(self, path=None, stat=None, skip=None): |
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183 return util.listdir(self.join(path), stat, skip) |
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184 |
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185 def readlock(self, path): |
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186 return util.readlock(self.join(path)) |
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187 |
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188 def rename(self, src, dst, checkambig=False): |
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189 """Rename from src to dst |
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190 |
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191 checkambig argument is used with util.filestat, and is useful |
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192 only if destination file is guarded by any lock |
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193 (e.g. repo.lock or repo.wlock). |
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194 |
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195 To avoid file stat ambiguity forcibly, checkambig=True involves |
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196 copying ``src`` file, if it is owned by another. Therefore, use |
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197 checkambig=True only in limited cases (see also issue5418 and |
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198 issue5584 for detail). |
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199 """ |
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200 srcpath = self.join(src) |
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201 dstpath = self.join(dst) |
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202 oldstat = checkambig and util.filestat.frompath(dstpath) |
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203 if oldstat and oldstat.stat: |
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204 ret = util.rename(srcpath, dstpath) |
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205 _avoidambig(dstpath, oldstat) |
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206 return ret |
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207 return util.rename(srcpath, dstpath) |
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208 |
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209 def readlink(self, path): |
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210 return os.readlink(self.join(path)) |
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211 |
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212 def removedirs(self, path=None): |
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213 """Remove a leaf directory and all empty intermediate ones |
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214 """ |
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215 return util.removedirs(self.join(path)) |
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216 |
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217 def rmtree(self, path=None, ignore_errors=False, forcibly=False): |
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218 """Remove a directory tree recursively |
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219 |
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220 If ``forcibly``, this tries to remove READ-ONLY files, too. |
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221 """ |
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222 if forcibly: |
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223 def onerror(function, path, excinfo): |
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224 if function is not os.remove: |
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225 raise |
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226 # read-only files cannot be unlinked under Windows |
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227 s = os.stat(path) |
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228 if (s.st_mode & stat.S_IWRITE) != 0: |
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229 raise |
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230 os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE) |
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231 os.remove(path) |
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232 else: |
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233 onerror = None |
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234 return shutil.rmtree(self.join(path), |
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235 ignore_errors=ignore_errors, onerror=onerror) |
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236 |
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237 def setflags(self, path, l, x): |
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238 return util.setflags(self.join(path), l, x) |
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239 |
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240 def stat(self, path=None): |
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241 return os.stat(self.join(path)) |
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242 |
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243 def unlink(self, path=None): |
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244 return util.unlink(self.join(path)) |
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245 |
31542 | 246 def tryunlink(self, path=None): |
247 """Attempt to remove a file, ignoring missing file errors.""" | |
248 util.tryunlink(self.join(path)) | |
249 | |
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250 def unlinkpath(self, path=None, ignoremissing=False): |
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251 return util.unlinkpath(self.join(path), ignoremissing=ignoremissing) |
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252 |
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253 def utime(self, path=None, t=None): |
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254 return os.utime(self.join(path), t) |
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255 |
24725 | 256 def walk(self, path=None, onerror=None): |
257 """Yield (dirpath, dirs, files) tuple for each directories under path | |
258 | |
259 ``dirpath`` is relative one from the root of this vfs. This | |
260 uses ``os.sep`` as path separator, even you specify POSIX | |
261 style ``path``. | |
262 | |
263 "The root of this vfs" is represented as empty ``dirpath``. | |
264 """ | |
265 root = os.path.normpath(self.join(None)) | |
266 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
267 # because len(dirpath) < prefixlen. | |
268 prefixlen = len(pathutil.normasprefix(root)) | |
269 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
270 yield (dirpath[prefixlen:], dirs, files) | |
271 | |
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272 @contextlib.contextmanager |
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273 def backgroundclosing(self, ui, expectedcount=-1): |
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274 """Allow files to be closed asynchronously. |
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275 |
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276 When this context manager is active, ``backgroundclose`` can be passed |
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277 to ``__call__``/``open`` to result in the file possibly being closed |
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278 asynchronously, on a background thread. |
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279 """ |
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280 # Sharing backgroundfilecloser between threads is complex and using |
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281 # multiple instances puts us at risk of running out of file descriptors |
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282 # only allow to use backgroundfilecloser when in main thread. |
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283 if not isinstance(threading.currentThread(), threading._MainThread): |
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284 yield |
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285 return |
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286 vfs = getattr(self, 'vfs', self) |
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287 if getattr(vfs, '_backgroundfilecloser', None): |
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288 raise error.Abort( |
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289 _('can only have 1 active background file closer')) |
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290 |
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291 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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292 try: |
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293 vfs._backgroundfilecloser = bfc |
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294 yield bfc |
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295 finally: |
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296 vfs._backgroundfilecloser = None |
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297 |
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298 class vfs(abstractvfs): |
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299 '''Operate files relative to a base directory |
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300 |
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301 This class is used to hide the details of COW semantics and |
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302 remote file access from higher level code. |
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303 |
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304 'cacheaudited' should be enabled only if (a) vfs object is short-lived, or |
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305 (b) the base directory is managed by hg and considered sort-of append-only. |
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306 See pathutil.pathauditor() for details. |
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307 ''' |
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308 def __init__(self, base, audit=True, cacheaudited=False, expandpath=False, |
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309 realpath=False): |
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310 if expandpath: |
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311 base = util.expandpath(base) |
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312 if realpath: |
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313 base = os.path.realpath(base) |
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314 self.base = base |
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315 self._audit = audit |
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316 if audit: |
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317 self.audit = pathutil.pathauditor(self.base, cached=cacheaudited) |
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318 else: |
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319 self.audit = (lambda path, mode=None: True) |
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320 self.createmode = None |
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321 self._trustnlink = None |
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322 |
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323 @util.propertycache |
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324 def _cansymlink(self): |
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325 return util.checklink(self.base) |
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326 |
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327 @util.propertycache |
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328 def _chmod(self): |
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329 return util.checkexec(self.base) |
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330 |
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331 def _fixfilemode(self, name): |
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332 if self.createmode is None or not self._chmod: |
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333 return |
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334 os.chmod(name, self.createmode & 0o666) |
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335 |
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336 def __call__(self, path, mode="r", atomictemp=False, notindexed=False, |
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337 backgroundclose=False, checkambig=False, auditpath=True): |
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338 '''Open ``path`` file, which is relative to vfs root. |
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339 |
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340 Newly created directories are marked as "not to be indexed by |
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341 the content indexing service", if ``notindexed`` is specified |
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342 for "write" mode access. |
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343 |
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344 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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345 It can only be used if the ``self.backgroundclosing()`` context manager |
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346 is active. This should only be specified if the following criteria hold: |
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347 |
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348 1. There is a potential for writing thousands of files. Unless you |
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349 are writing thousands of files, the performance benefits of |
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350 asynchronously closing files is not realized. |
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351 2. Files are opened exactly once for the ``backgroundclosing`` |
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352 active duration and are therefore free of race conditions between |
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353 closing a file on a background thread and reopening it. (If the |
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354 file were opened multiple times, there could be unflushed data |
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355 because the original file handle hasn't been flushed/closed yet.) |
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356 |
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357 ``checkambig`` argument is passed to atomictemplfile (valid |
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358 only for writing), and is useful only if target file is |
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359 guarded by any lock (e.g. repo.lock or repo.wlock). |
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360 |
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361 To avoid file stat ambiguity forcibly, checkambig=True involves |
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362 copying ``path`` file opened in "append" mode (e.g. for |
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363 truncation), if it is owned by another. Therefore, use |
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364 combination of append mode and checkambig=True only in limited |
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365 cases (see also issue5418 and issue5584 for detail). |
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366 ''' |
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367 if auditpath: |
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368 if self._audit: |
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369 r = util.checkosfilename(path) |
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370 if r: |
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371 raise error.Abort("%s: %r" % (r, path)) |
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372 self.audit(path, mode=mode) |
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373 f = self.join(path) |
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374 |
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375 if "b" not in mode: |
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376 mode += "b" # for that other OS |
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377 |
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378 nlink = -1 |
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379 if mode not in ('r', 'rb'): |
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380 dirname, basename = util.split(f) |
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381 # If basename is empty, then the path is malformed because it points |
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382 # to a directory. Let the posixfile() call below raise IOError. |
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383 if basename: |
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384 if atomictemp: |
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385 util.makedirs(dirname, self.createmode, notindexed) |
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386 return util.atomictempfile(f, mode, self.createmode, |
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387 checkambig=checkambig) |
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388 try: |
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389 if 'w' in mode: |
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390 util.unlink(f) |
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391 nlink = 0 |
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392 else: |
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393 # nlinks() may behave differently for files on Windows |
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394 # shares if the file is open. |
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395 with util.posixfile(f): |
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396 nlink = util.nlinks(f) |
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397 if nlink < 1: |
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398 nlink = 2 # force mktempcopy (issue1922) |
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399 except (OSError, IOError) as e: |
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400 if e.errno != errno.ENOENT: |
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401 raise |
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402 nlink = 0 |
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403 util.makedirs(dirname, self.createmode, notindexed) |
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404 if nlink > 0: |
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405 if self._trustnlink is None: |
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406 self._trustnlink = nlink > 1 or util.checknlink(f) |
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407 if nlink > 1 or not self._trustnlink: |
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408 util.rename(util.mktempcopy(f), f) |
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409 fp = util.posixfile(f, mode) |
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410 if nlink == 0: |
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411 self._fixfilemode(f) |
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412 |
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413 if checkambig: |
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414 if mode in ('r', 'rb'): |
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415 raise error.Abort(_('implementation error: mode %s is not' |
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416 ' valid for checkambig=True') % mode) |
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417 fp = checkambigatclosing(fp) |
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418 |
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419 if (backgroundclose and |
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420 isinstance(threading.currentThread(), threading._MainThread)): |
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421 if not self._backgroundfilecloser: |
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422 raise error.Abort(_('backgroundclose can only be used when a ' |
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423 'backgroundclosing context manager is active') |
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424 ) |
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425 |
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426 fp = delayclosedfile(fp, self._backgroundfilecloser) |
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427 |
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428 return fp |
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429 |
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430 def symlink(self, src, dst): |
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431 self.audit(dst) |
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432 linkname = self.join(dst) |
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434 |
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435 util.makedirs(os.path.dirname(linkname), self.createmode) |
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436 |
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437 if self._cansymlink: |
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438 try: |
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439 os.symlink(src, linkname) |
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440 except OSError as err: |
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441 raise OSError(err.errno, _('could not symlink to %r: %s') % |
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442 (src, encoding.strtolocal(err.strerror)), |
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443 linkname) |
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Adrian Buehlmann <adrian@cadifra.com>
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444 else: |
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vfs: use self.write to write symlink placeholders
Matt Mackall <mpm@selenic.com>
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445 self.write(dst, src) |
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move canonpath from util to scmutil
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446 |
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447 def join(self, path, *insidef): |
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448 if path: |
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449 return os.path.join(self.base, path, *insidef) |
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450 else: |
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451 return self.base |
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452 |
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453 opener = vfs |
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454 |
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vfs: rename auditvfs to proxyvfs
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455 class proxyvfs(object): |
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scmutil: abstract out mustaudit delegation
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456 def __init__(self, vfs): |
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457 self.vfs = vfs |
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458 |
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459 @property |
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460 def options(self): |
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461 return self.vfs.options |
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462 |
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463 @options.setter |
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464 def options(self, value): |
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465 self.vfs.options = value |
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466 |
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467 class filtervfs(abstractvfs, proxyvfs): |
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468 '''Wrapper vfs for filtering filenames with a function.''' |
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469 |
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scmutil: add mustaudit delegation to filtervfs (issue3673)
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470 def __init__(self, vfs, filter): |
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471 proxyvfs.__init__(self, vfs) |
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472 self._filter = filter |
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473 |
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474 def __call__(self, path, *args, **kwargs): |
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475 return self.vfs(self._filter(path), *args, **kwargs) |
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476 |
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477 def join(self, path, *insidef): |
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478 if path: |
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479 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
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480 else: |
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481 return self.vfs.join(path) |
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482 |
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483 filteropener = filtervfs |
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484 |
33412
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485 class readonlyvfs(abstractvfs, proxyvfs): |
18213
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486 '''Wrapper vfs preventing any writing.''' |
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487 |
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488 def __init__(self, vfs): |
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489 proxyvfs.__init__(self, vfs) |
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490 |
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491 def __call__(self, path, mode='r', *args, **kw): |
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492 if mode not in ('r', 'rb'): |
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i18n: translate abort messages
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493 raise error.Abort(_('this vfs is read only')) |
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494 return self.vfs(path, mode, *args, **kw) |
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495 |
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Siddharth Agarwal <sid0@fb.com>
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496 def join(self, path, *insidef): |
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497 return self.vfs.join(path, *insidef) |
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498 |
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499 class closewrapbase(object): |
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500 """Base class of wrapper, which hooks closing |
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501 |
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502 Do not instantiate outside of the vfs layer. |
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503 """ |
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504 def __init__(self, fh): |
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505 object.__setattr__(self, r'_origfh', fh) |
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506 |
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507 def __getattr__(self, attr): |
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508 return getattr(self._origfh, attr) |
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509 |
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510 def __setattr__(self, attr, value): |
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511 return setattr(self._origfh, attr, value) |
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512 |
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513 def __delattr__(self, attr): |
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514 return delattr(self._origfh, attr) |
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515 |
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516 def __enter__(self): |
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517 return self._origfh.__enter__() |
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518 |
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519 def __exit__(self, exc_type, exc_value, exc_tb): |
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520 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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521 |
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522 def close(self): |
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523 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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524 |
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525 class delayclosedfile(closewrapbase): |
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526 """Proxy for a file object whose close is delayed. |
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527 |
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528 Do not instantiate outside of the vfs layer. |
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529 """ |
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530 def __init__(self, fh, closer): |
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531 super(delayclosedfile, self).__init__(fh) |
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532 object.__setattr__(self, r'_closer', closer) |
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533 |
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534 def __exit__(self, exc_type, exc_value, exc_tb): |
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535 self._closer.close(self._origfh) |
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536 |
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537 def close(self): |
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538 self._closer.close(self._origfh) |
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539 |
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540 class backgroundfilecloser(object): |
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541 """Coordinates background closing of file handles on multiple threads.""" |
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542 def __init__(self, ui, expectedcount=-1): |
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543 self._running = False |
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544 self._entered = False |
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545 self._threads = [] |
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546 self._threadexception = None |
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547 |
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548 # Only Windows/NTFS has slow file closing. So only enable by default |
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549 # on that platform. But allow to be enabled elsewhere for testing. |
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551 enabled = ui.configbool('worker', 'backgroundclose', defaultenabled) |
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552 |
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553 if not enabled: |
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554 return |
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555 |
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556 # There is overhead to starting and stopping the background threads. |
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557 # Don't do background processing unless the file count is large enough |
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558 # to justify it. |
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559 minfilecount = ui.configint('worker', 'backgroundcloseminfilecount') |
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560 # FUTURE dynamically start background threads after minfilecount closes. |
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561 # (We don't currently have any callers that don't know their file count) |
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562 if expectedcount > 0 and expectedcount < minfilecount: |
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563 return |
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564 |
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565 maxqueue = ui.configint('worker', 'backgroundclosemaxqueue') |
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566 threadcount = ui.configint('worker', 'backgroundclosethreadcount') |
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567 |
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568 ui.debug('starting %d threads for background file closing\n' % |
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569 threadcount) |
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570 |
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571 self._queue = util.queue(maxsize=maxqueue) |
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572 self._running = True |
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573 |
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574 for i in range(threadcount): |
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575 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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576 self._threads.append(t) |
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577 t.start() |
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578 |
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579 def __enter__(self): |
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580 self._entered = True |
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581 return self |
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582 |
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583 def __exit__(self, exc_type, exc_value, exc_tb): |
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584 self._running = False |
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585 |
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586 # Wait for threads to finish closing so open files don't linger for |
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587 # longer than lifetime of context manager. |
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588 for t in self._threads: |
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589 t.join() |
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590 |
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591 def _worker(self): |
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592 """Main routine for worker thread.""" |
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593 while True: |
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594 try: |
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595 fh = self._queue.get(block=True, timeout=0.100) |
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596 # Need to catch or the thread will terminate and |
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597 # we could orphan file descriptors. |
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598 try: |
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599 fh.close() |
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600 except Exception as e: |
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601 # Stash so can re-raise from main thread later. |
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602 self._threadexception = e |
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603 except util.empty: |
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604 if not self._running: |
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605 break |
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606 |
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607 def close(self, fh): |
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608 """Schedule a file for closing.""" |
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609 if not self._entered: |
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610 raise error.Abort(_('can only call close() when context manager ' |
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611 'active')) |
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612 |
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613 # If a background thread encountered an exception, raise now so we fail |
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614 # fast. Otherwise we may potentially go on for minutes until the error |
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615 # is acted on. |
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616 if self._threadexception: |
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617 e = self._threadexception |
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618 self._threadexception = None |
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619 raise e |
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620 |
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621 # If we're not actively running, close synchronously. |
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622 if not self._running: |
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623 fh.close() |
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624 return |
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625 |
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626 self._queue.put(fh, block=True, timeout=None) |
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627 |
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628 class checkambigatclosing(closewrapbase): |
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629 """Proxy for a file object, to avoid ambiguity of file stat |
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630 |
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631 See also util.filestat for detail about "ambiguity of file stat". |
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632 |
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633 This proxy is useful only if the target file is guarded by any |
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634 lock (e.g. repo.lock or repo.wlock) |
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635 |
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636 Do not instantiate outside of the vfs layer. |
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637 """ |
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638 def __init__(self, fh): |
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639 super(checkambigatclosing, self).__init__(fh) |
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640 object.__setattr__(self, r'_oldstat', util.filestat.frompath(fh.name)) |
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641 |
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642 def _checkambig(self): |
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643 oldstat = self._oldstat |
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644 if oldstat.stat: |
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645 _avoidambig(self._origfh.name, oldstat) |
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646 |
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647 def __exit__(self, exc_type, exc_value, exc_tb): |
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648 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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649 self._checkambig() |
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650 |
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651 def close(self): |
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652 self._origfh.close() |
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653 self._checkambig() |