Mercurial > hg
annotate mercurial/vfs.py @ 48673:576040155dba
arbitraryfilectx: use our existing helpers for reading and writing files
Differential Revision: https://phab.mercurial-scm.org/D12090
author | Martin von Zweigbergk <martinvonz@google.com> |
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date | Wed, 26 Jan 2022 15:32:18 -0800 |
parents | 98c3fa6a3ac2 |
children | 6000f5b25c9b |
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 Olivia Mackall <olivia@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 threading |
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15 |
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16 from .i18n import _ |
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17 from .pycompat import ( |
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18 delattr, |
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19 getattr, |
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20 setattr, |
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21 ) |
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22 from . import ( |
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23 encoding, |
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24 error, |
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25 pathutil, |
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26 pycompat, |
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27 util, |
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28 ) |
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29 |
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30 |
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31 def _avoidambig(path, oldstat): |
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32 """Avoid file stat ambiguity forcibly |
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33 |
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34 This function causes copying ``path`` file, if it is owned by |
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35 another (see issue5418 and issue5584 for detail). |
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36 """ |
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37 |
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38 def checkandavoid(): |
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39 newstat = util.filestat.frompath(path) |
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40 # return whether file stat ambiguity is (already) avoided |
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41 return not newstat.isambig(oldstat) or newstat.avoidambig(path, oldstat) |
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42 |
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43 if not checkandavoid(): |
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44 # simply copy to change owner of path to get privilege to |
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45 # advance mtime (see issue5418) |
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46 util.rename(util.mktempcopy(path), path) |
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47 checkandavoid() |
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48 |
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49 |
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50 class abstractvfs(object): |
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51 """Abstract base class; cannot be instantiated""" |
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52 |
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53 # default directory separator for vfs |
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54 # |
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55 # Other vfs code always use `/` and this works fine because python file API |
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56 # abstract the use of `/` and make it work transparently. For consistency |
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57 # vfs will always use `/` when joining. This avoid some confusion in |
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58 # encoded vfs (see issue6546) |
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59 _dir_sep = b'/' |
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60 |
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61 def __init__(self, *args, **kwargs): |
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62 '''Prevent instantiation; don't call this from subclasses.''' |
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63 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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64 |
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65 def __call__(self, path, mode=b'rb', **kwargs): |
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66 raise NotImplementedError |
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67 |
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68 def _auditpath(self, path, mode): |
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69 raise NotImplementedError |
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70 |
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71 def join(self, path, *insidef): |
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72 raise NotImplementedError |
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73 |
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74 def tryread(self, path): |
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75 '''gracefully return an empty string for missing files''' |
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76 try: |
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77 return self.read(path) |
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78 except IOError as inst: |
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79 if inst.errno != errno.ENOENT: |
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80 raise |
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81 return b"" |
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82 |
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83 def tryreadlines(self, path, mode=b'rb'): |
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84 '''gracefully return an empty array for missing files''' |
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85 try: |
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86 return self.readlines(path, mode=mode) |
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87 except IOError as inst: |
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88 if inst.errno != errno.ENOENT: |
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89 raise |
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90 return [] |
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91 |
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92 @util.propertycache |
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93 def open(self): |
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94 """Open ``path`` file, which is relative to vfs root. |
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95 |
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96 Newly created directories are marked as "not to be indexed by |
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97 the content indexing service", if ``notindexed`` is specified |
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98 for "write" mode access. |
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99 """ |
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100 return self.__call__ |
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101 |
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102 def read(self, path): |
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103 with self(path, b'rb') as fp: |
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104 return fp.read() |
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105 |
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106 def readlines(self, path, mode=b'rb'): |
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107 with self(path, mode=mode) as fp: |
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108 return fp.readlines() |
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109 |
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110 def write(self, path, data, backgroundclose=False, **kwargs): |
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111 with self(path, b'wb', backgroundclose=backgroundclose, **kwargs) as fp: |
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112 return fp.write(data) |
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113 |
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114 def writelines(self, path, data, mode=b'wb', notindexed=False): |
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115 with self(path, mode=mode, notindexed=notindexed) as fp: |
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116 return fp.writelines(data) |
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117 |
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118 def append(self, path, data): |
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119 with self(path, b'ab') as fp: |
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120 return fp.write(data) |
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121 |
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122 def basename(self, path): |
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123 """return base element of a path (as os.path.basename would do) |
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124 |
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125 This exists to allow handling of strange encoding if needed.""" |
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126 return os.path.basename(path) |
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127 |
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128 def chmod(self, path, mode): |
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129 return os.chmod(self.join(path), mode) |
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130 |
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131 def dirname(self, path): |
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132 """return dirname element of a path (as os.path.dirname would do) |
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133 |
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134 This exists to allow handling of strange encoding if needed.""" |
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135 return os.path.dirname(path) |
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136 |
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137 def exists(self, path=None): |
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138 return os.path.exists(self.join(path)) |
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139 |
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140 def fstat(self, fp): |
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141 return util.fstat(fp) |
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142 |
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143 def isdir(self, path=None): |
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144 return os.path.isdir(self.join(path)) |
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145 |
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146 def isfile(self, path=None): |
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147 return os.path.isfile(self.join(path)) |
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148 |
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149 def islink(self, path=None): |
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150 return os.path.islink(self.join(path)) |
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151 |
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152 def isfileorlink(self, path=None): |
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153 """return whether path is a regular file or a symlink |
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154 |
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155 Unlike isfile, this doesn't follow symlinks.""" |
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156 try: |
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157 st = self.lstat(path) |
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158 except OSError: |
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159 return False |
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160 mode = st.st_mode |
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161 return stat.S_ISREG(mode) or stat.S_ISLNK(mode) |
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162 |
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163 def _join(self, *paths): |
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164 root_idx = 0 |
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165 for idx, p in enumerate(paths): |
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166 if os.path.isabs(p) or p.startswith(self._dir_sep): |
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167 root_idx = idx |
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168 if root_idx != 0: |
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169 paths = paths[root_idx:] |
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170 paths = [p for p in paths if p] |
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171 return self._dir_sep.join(paths) |
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172 |
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173 def reljoin(self, *paths): |
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174 """join various elements of a path together (as os.path.join would do) |
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175 |
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176 The vfs base is not injected so that path stay relative. This exists |
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177 to allow handling of strange encoding if needed.""" |
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178 return self._join(*paths) |
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179 |
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180 def split(self, path): |
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181 """split top-most element of a path (as os.path.split would do) |
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182 |
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183 This exists to allow handling of strange encoding if needed.""" |
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184 return os.path.split(path) |
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185 |
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186 def lexists(self, path=None): |
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187 return os.path.lexists(self.join(path)) |
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188 |
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189 def lstat(self, path=None): |
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190 return os.lstat(self.join(path)) |
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191 |
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192 def listdir(self, path=None): |
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193 return os.listdir(self.join(path)) |
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194 |
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195 def makedir(self, path=None, notindexed=True): |
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196 return util.makedir(self.join(path), notindexed) |
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197 |
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198 def makedirs(self, path=None, mode=None): |
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199 return util.makedirs(self.join(path), mode) |
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200 |
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201 def makelock(self, info, path): |
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202 return util.makelock(info, self.join(path)) |
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203 |
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204 def mkdir(self, path=None): |
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205 return os.mkdir(self.join(path)) |
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206 |
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207 def mkstemp(self, suffix=b'', prefix=b'tmp', dir=None): |
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208 fd, name = pycompat.mkstemp( |
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209 suffix=suffix, prefix=prefix, dir=self.join(dir) |
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210 ) |
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211 dname, fname = util.split(name) |
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212 if dir: |
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213 return fd, os.path.join(dir, fname) |
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214 else: |
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215 return fd, fname |
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216 |
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217 def readdir(self, path=None, stat=None, skip=None): |
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218 return util.listdir(self.join(path), stat, skip) |
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219 |
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220 def readlock(self, path): |
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221 return util.readlock(self.join(path)) |
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222 |
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223 def rename(self, src, dst, checkambig=False): |
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224 """Rename from src to dst |
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225 |
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226 checkambig argument is used with util.filestat, and is useful |
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227 only if destination file is guarded by any lock |
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228 (e.g. repo.lock or repo.wlock). |
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229 |
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230 To avoid file stat ambiguity forcibly, checkambig=True involves |
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231 copying ``src`` file, if it is owned by another. Therefore, use |
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232 checkambig=True only in limited cases (see also issue5418 and |
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233 issue5584 for detail). |
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234 """ |
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235 self._auditpath(dst, b'w') |
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236 srcpath = self.join(src) |
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237 dstpath = self.join(dst) |
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238 oldstat = checkambig and util.filestat.frompath(dstpath) |
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239 if oldstat and oldstat.stat: |
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240 ret = util.rename(srcpath, dstpath) |
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241 _avoidambig(dstpath, oldstat) |
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242 return ret |
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243 return util.rename(srcpath, dstpath) |
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244 |
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245 def readlink(self, path): |
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246 return util.readlink(self.join(path)) |
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247 |
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248 def removedirs(self, path=None): |
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249 """Remove a leaf directory and all empty intermediate ones""" |
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250 return util.removedirs(self.join(path)) |
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251 |
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252 def rmdir(self, path=None): |
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253 """Remove an empty directory.""" |
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254 return os.rmdir(self.join(path)) |
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255 |
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256 def rmtree(self, path=None, ignore_errors=False, forcibly=False): |
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257 """Remove a directory tree recursively |
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258 |
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259 If ``forcibly``, this tries to remove READ-ONLY files, too. |
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260 """ |
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261 if forcibly: |
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262 |
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263 def onerror(function, path, excinfo): |
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264 if function is not os.remove: |
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265 raise |
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266 # read-only files cannot be unlinked under Windows |
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267 s = os.stat(path) |
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268 if (s.st_mode & stat.S_IWRITE) != 0: |
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269 raise |
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270 os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE) |
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271 os.remove(path) |
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272 |
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273 else: |
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274 onerror = None |
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275 return shutil.rmtree( |
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276 self.join(path), ignore_errors=ignore_errors, onerror=onerror |
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277 ) |
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278 |
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279 def setflags(self, path, l, x): |
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280 return util.setflags(self.join(path), l, x) |
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281 |
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282 def stat(self, path=None): |
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283 return os.stat(self.join(path)) |
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284 |
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285 def unlink(self, path=None): |
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286 return util.unlink(self.join(path)) |
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287 |
31542 | 288 def tryunlink(self, path=None): |
289 """Attempt to remove a file, ignoring missing file errors.""" | |
290 util.tryunlink(self.join(path)) | |
291 | |
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292 def unlinkpath(self, path=None, ignoremissing=False, rmdir=True): |
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293 return util.unlinkpath( |
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294 self.join(path), ignoremissing=ignoremissing, rmdir=rmdir |
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295 ) |
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296 |
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297 def utime(self, path=None, t=None): |
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298 return os.utime(self.join(path), t) |
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299 |
24725 | 300 def walk(self, path=None, onerror=None): |
301 """Yield (dirpath, dirs, files) tuple for each directories under path | |
302 | |
303 ``dirpath`` is relative one from the root of this vfs. This | |
304 uses ``os.sep`` as path separator, even you specify POSIX | |
305 style ``path``. | |
306 | |
307 "The root of this vfs" is represented as empty ``dirpath``. | |
308 """ | |
309 root = os.path.normpath(self.join(None)) | |
310 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
311 # because len(dirpath) < prefixlen. | |
312 prefixlen = len(pathutil.normasprefix(root)) | |
313 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
314 yield (dirpath[prefixlen:], dirs, files) | |
315 | |
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316 @contextlib.contextmanager |
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317 def backgroundclosing(self, ui, expectedcount=-1): |
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318 """Allow files to be closed asynchronously. |
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319 |
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320 When this context manager is active, ``backgroundclose`` can be passed |
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321 to ``__call__``/``open`` to result in the file possibly being closed |
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322 asynchronously, on a background thread. |
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323 """ |
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324 # Sharing backgroundfilecloser between threads is complex and using |
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325 # multiple instances puts us at risk of running out of file descriptors |
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326 # only allow to use backgroundfilecloser when in main thread. |
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327 if not isinstance( |
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328 threading.current_thread(), |
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329 threading._MainThread, # pytype: disable=module-attr |
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330 ): |
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331 yield |
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332 return |
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333 vfs = getattr(self, 'vfs', self) |
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334 if getattr(vfs, '_backgroundfilecloser', None): |
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335 raise error.Abort( |
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336 _(b'can only have 1 active background file closer') |
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337 ) |
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338 |
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339 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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340 try: |
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341 vfs._backgroundfilecloser = ( |
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342 bfc # pytype: disable=attribute-error |
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343 ) |
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344 yield bfc |
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345 finally: |
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346 vfs._backgroundfilecloser = ( |
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347 None # pytype: disable=attribute-error |
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348 ) |
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349 |
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350 def register_file(self, path): |
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351 """generic hook point to lets fncache steer its stew""" |
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352 |
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353 |
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354 class vfs(abstractvfs): |
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355 """Operate files relative to a base directory |
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356 |
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357 This class is used to hide the details of COW semantics and |
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358 remote file access from higher level code. |
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359 |
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360 'cacheaudited' should be enabled only if (a) vfs object is short-lived, or |
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361 (b) the base directory is managed by hg and considered sort-of append-only. |
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362 See pathutil.pathauditor() for details. |
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363 """ |
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364 |
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365 def __init__( |
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366 self, |
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367 base, |
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368 audit=True, |
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369 cacheaudited=False, |
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370 expandpath=False, |
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371 realpath=False, |
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372 ): |
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373 if expandpath: |
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374 base = util.expandpath(base) |
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375 if realpath: |
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376 base = os.path.realpath(base) |
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377 self.base = base |
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378 self._audit = audit |
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379 if audit: |
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380 self.audit = pathutil.pathauditor(self.base, cached=cacheaudited) |
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381 else: |
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382 self.audit = lambda path, mode=None: True |
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383 self.createmode = None |
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384 self._trustnlink = None |
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385 self.options = {} |
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386 |
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387 @util.propertycache |
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388 def _cansymlink(self): |
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389 return util.checklink(self.base) |
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390 |
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391 @util.propertycache |
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392 def _chmod(self): |
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393 return util.checkexec(self.base) |
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394 |
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395 def _fixfilemode(self, name): |
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396 if self.createmode is None or not self._chmod: |
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397 return |
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398 os.chmod(name, self.createmode & 0o666) |
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399 |
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400 def _auditpath(self, path, mode): |
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401 if self._audit: |
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402 if os.path.isabs(path) and path.startswith(self.base): |
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403 path = os.path.relpath(path, self.base) |
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404 r = util.checkosfilename(path) |
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405 if r: |
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406 raise error.Abort(b"%s: %r" % (r, path)) |
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407 self.audit(path, mode=mode) |
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408 |
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409 def __call__( |
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410 self, |
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411 path, |
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412 mode=b"r", |
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413 atomictemp=False, |
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414 notindexed=False, |
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415 backgroundclose=False, |
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416 checkambig=False, |
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417 auditpath=True, |
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418 makeparentdirs=True, |
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419 ): |
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420 """Open ``path`` file, which is relative to vfs root. |
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421 |
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422 By default, parent directories are created as needed. Newly created |
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423 directories are marked as "not to be indexed by the content indexing |
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424 service", if ``notindexed`` is specified for "write" mode access. |
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425 Set ``makeparentdirs=False`` to not create directories implicitly. |
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426 |
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427 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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428 It can only be used if the ``self.backgroundclosing()`` context manager |
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429 is active. This should only be specified if the following criteria hold: |
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430 |
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431 1. There is a potential for writing thousands of files. Unless you |
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432 are writing thousands of files, the performance benefits of |
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433 asynchronously closing files is not realized. |
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434 2. Files are opened exactly once for the ``backgroundclosing`` |
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435 active duration and are therefore free of race conditions between |
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436 closing a file on a background thread and reopening it. (If the |
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437 file were opened multiple times, there could be unflushed data |
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438 because the original file handle hasn't been flushed/closed yet.) |
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439 |
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440 ``checkambig`` argument is passed to atomictempfile (valid |
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441 only for writing), and is useful only if target file is |
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442 guarded by any lock (e.g. repo.lock or repo.wlock). |
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443 |
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444 To avoid file stat ambiguity forcibly, checkambig=True involves |
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445 copying ``path`` file opened in "append" mode (e.g. for |
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446 truncation), if it is owned by another. Therefore, use |
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447 combination of append mode and checkambig=True only in limited |
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448 cases (see also issue5418 and issue5584 for detail). |
45942
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449 """ |
33257
15e9cbe6ae49
vfs: simplify path audit disabling in stream clone
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parents:
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|
450 if auditpath: |
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parents:
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|
451 self._auditpath(path, mode) |
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452 f = self.join(path) |
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453 |
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454 if b"b" not in mode: |
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455 mode += b"b" # for that other OS |
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456 |
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457 nlink = -1 |
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458 if mode not in (b'r', b'rb'): |
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459 dirname, basename = util.split(f) |
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460 # If basename is empty, then the path is malformed because it points |
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461 # to a directory. Let the posixfile() call below raise IOError. |
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462 if basename: |
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|
463 if atomictemp: |
40796
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parents:
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|
464 if makeparentdirs: |
03bca908d9fb
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|
465 util.makedirs(dirname, self.createmode, notindexed) |
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466 return util.atomictempfile( |
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467 f, mode, self.createmode, checkambig=checkambig |
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468 ) |
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469 try: |
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470 if b'w' in mode: |
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471 util.unlink(f) |
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472 nlink = 0 |
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473 else: |
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474 # nlinks() may behave differently for files on Windows |
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475 # shares if the file is open. |
27706
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476 with util.posixfile(f): |
22e362da27cf
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477 nlink = util.nlinks(f) |
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478 if nlink < 1: |
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479 nlink = 2 # force mktempcopy (issue1922) |
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480 except (OSError, IOError) as e: |
17937
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481 if e.errno != errno.ENOENT: |
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482 raise |
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483 nlink = 0 |
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484 if makeparentdirs: |
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485 util.makedirs(dirname, self.createmode, notindexed) |
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486 if nlink > 0: |
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487 if self._trustnlink is None: |
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488 self._trustnlink = nlink > 1 or util.checknlink(f) |
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489 if nlink > 1 or not self._trustnlink: |
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490 util.rename(util.mktempcopy(f), f) |
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491 fp = util.posixfile(f, mode) |
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492 if nlink == 0: |
17763
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vfs: backout fchmod change from 76b73ce0ffac
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parents:
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|
493 self._fixfilemode(f) |
27895
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|
494 |
29996
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495 if checkambig: |
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496 if mode in (b'r', b'rb'): |
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497 raise error.Abort( |
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498 _( |
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499 b'implementation error: mode %s is not' |
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500 b' valid for checkambig=True' |
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501 ) |
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502 % mode |
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503 ) |
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|
504 fp = checkambigatclosing(fp) |
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505 |
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|
506 if backgroundclose and isinstance( |
47178
63286e0886a6
vfs: Fix deprecation warning in Python 3.10 (issue6520)
Karthikeyan Singaravelan <tir.karthi@gmail.com>
parents:
46819
diff
changeset
|
507 threading.current_thread(), |
43482
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|
508 threading._MainThread, # pytype: disable=module-attr |
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509 ): |
43484
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|
510 if ( |
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changeset
|
511 not self._backgroundfilecloser # pytype: disable=attribute-error |
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|
512 ): |
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513 raise error.Abort( |
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|
514 _( |
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|
515 b'backgroundclose can only be used when a ' |
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516 b'backgroundclosing context manager is active' |
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517 ) |
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518 ) |
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|
519 |
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|
520 fp = delayclosedfile( |
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|
521 fp, |
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|
522 self._backgroundfilecloser, # pytype: disable=attribute-error |
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|
523 ) |
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|
524 |
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|
525 return fp |
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|
526 |
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changeset
|
527 def symlink(self, src, dst): |
18327
4aecdb91443c
scmutil: simplify vfs.audit - drop wrapped vfs.auditor
Mads Kiilerich <mads@kiilerich.com>
parents:
18316
diff
changeset
|
528 self.audit(dst) |
16199
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Idan Kamara <idankk86@gmail.com>
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diff
changeset
|
529 linkname = self.join(dst) |
31549 | 530 util.tryunlink(linkname) |
13970
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changeset
|
531 |
29017
07be86828e79
util: fix race in makedirs()
Adam Simpkins <simpkins@fb.com>
parents:
28819
diff
changeset
|
532 util.makedirs(os.path.dirname(linkname), self.createmode) |
13970
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changeset
|
533 |
14261
e3649bcca3f6
opener: rename _can_symlink to _cansymlink
Adrian Buehlmann <adrian@cadifra.com>
parents:
14236
diff
changeset
|
534 if self._cansymlink: |
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|
535 try: |
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changeset
|
536 os.symlink(src, linkname) |
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|
537 except OSError as err: |
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|
538 raise OSError( |
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|
539 err.errno, |
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|
540 _(b'could not symlink to %r: %s') |
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|
541 % (src, encoding.strtolocal(err.strerror)), |
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542 linkname, |
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543 ) |
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|
544 else: |
17768
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vfs: use self.write to write symlink placeholders
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parents:
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changeset
|
545 self.write(dst, src) |
13971
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diff
changeset
|
546 |
24628
a0b47885a1c5
vfs: make it possible to pass multiple path elements to join
Matt Harbison <matt_harbison@yahoo.com>
parents:
24582
diff
changeset
|
547 def join(self, path, *insidef): |
17161
be016e96117a
localrepo: use file API via vfs while ensuring repository directory
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17157
diff
changeset
|
548 if path: |
47809
98c3fa6a3ac2
vfs: always use / as file separator (issue6546)
Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
47443
diff
changeset
|
549 parts = [self.base, path] |
98c3fa6a3ac2
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Pierre-Yves David <pierre-yves.david@octobus.net>
parents:
47443
diff
changeset
|
550 parts.extend(insidef) |
98c3fa6a3ac2
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parents:
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changeset
|
551 return self._join(*parts) |
17681
a41fd730f230
scmutil: backout 83785bb56062 (issue3643)
Matt Mackall <mpm@selenic.com>
parents:
17675
diff
changeset
|
552 else: |
a41fd730f230
scmutil: backout 83785bb56062 (issue3643)
Matt Mackall <mpm@selenic.com>
parents:
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changeset
|
553 return self.base |
16199
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|
554 |
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555 |
17649
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FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents:
17561
diff
changeset
|
556 opener = vfs |
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scmutil: rename classes from "opener" to "vfs"
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|
557 |
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558 |
41093
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Boris Feld <boris.feld@octobus.net>
parents:
41092
diff
changeset
|
559 class proxyvfs(abstractvfs): |
17845
408ded42c5ec
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Bryan O'Sullivan <bryano@fb.com>
parents:
17821
diff
changeset
|
560 def __init__(self, vfs): |
408ded42c5ec
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diff
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|
561 self.vfs = vfs |
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|
562 |
41094
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parents:
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diff
changeset
|
563 def _auditpath(self, path, mode): |
adee334d94cd
vfs: handle _auditpath in proxyvfs
Boris Feld <boris.feld@octobus.net>
parents:
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564 return self.vfs._auditpath(path, mode) |
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565 |
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566 @property |
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567 def options(self): |
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568 return self.vfs.options |
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569 |
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570 @options.setter |
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571 def options(self, value): |
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572 self.vfs.options = value |
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573 |
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574 |
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575 class filtervfs(proxyvfs, abstractvfs): |
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576 '''Wrapper vfs for filtering filenames with a function.''' |
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577 |
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578 def __init__(self, vfs, filter): |
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579 proxyvfs.__init__(self, vfs) |
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580 self._filter = filter |
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581 |
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582 def __call__(self, path, *args, **kwargs): |
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583 return self.vfs(self._filter(path), *args, **kwargs) |
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584 |
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585 def join(self, path, *insidef): |
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586 if path: |
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587 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
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588 else: |
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589 return self.vfs.join(path) |
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590 |
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591 |
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592 filteropener = filtervfs |
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593 |
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594 |
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595 class readonlyvfs(proxyvfs): |
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596 '''Wrapper vfs preventing any writing.''' |
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597 |
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598 def __init__(self, vfs): |
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599 proxyvfs.__init__(self, vfs) |
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600 |
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601 def __call__(self, path, mode=b'r', *args, **kw): |
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602 if mode not in (b'r', b'rb'): |
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603 raise error.Abort(_(b'this vfs is read only')) |
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604 return self.vfs(path, mode, *args, **kw) |
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605 |
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606 def join(self, path, *insidef): |
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607 return self.vfs.join(path, *insidef) |
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608 |
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609 |
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610 class closewrapbase(object): |
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611 """Base class of wrapper, which hooks closing |
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612 |
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613 Do not instantiate outside of the vfs layer. |
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614 """ |
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615 |
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616 def __init__(self, fh): |
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617 object.__setattr__(self, '_origfh', fh) |
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618 |
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619 def __getattr__(self, attr): |
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620 return getattr(self._origfh, attr) |
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621 |
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622 def __setattr__(self, attr, value): |
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623 return setattr(self._origfh, attr, value) |
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624 |
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625 def __delattr__(self, attr): |
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626 return delattr(self._origfh, attr) |
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627 |
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628 def __enter__(self): |
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629 self._origfh.__enter__() |
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630 return self |
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631 |
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632 def __exit__(self, exc_type, exc_value, exc_tb): |
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633 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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634 |
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635 def close(self): |
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636 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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637 |
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638 |
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639 class delayclosedfile(closewrapbase): |
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640 """Proxy for a file object whose close is delayed. |
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641 |
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642 Do not instantiate outside of the vfs layer. |
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643 """ |
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644 |
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645 def __init__(self, fh, closer): |
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646 super(delayclosedfile, self).__init__(fh) |
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647 object.__setattr__(self, '_closer', closer) |
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648 |
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649 def __exit__(self, exc_type, exc_value, exc_tb): |
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650 self._closer.close(self._origfh) |
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651 |
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652 def close(self): |
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653 self._closer.close(self._origfh) |
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654 |
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655 |
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656 class backgroundfilecloser(object): |
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657 """Coordinates background closing of file handles on multiple threads.""" |
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658 |
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659 def __init__(self, ui, expectedcount=-1): |
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660 self._running = False |
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661 self._entered = False |
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662 self._threads = [] |
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663 self._threadexception = None |
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664 |
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665 # Only Windows/NTFS has slow file closing. So only enable by default |
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666 # on that platform. But allow to be enabled elsewhere for testing. |
34645 | 667 defaultenabled = pycompat.iswindows |
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668 enabled = ui.configbool(b'worker', b'backgroundclose', defaultenabled) |
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669 |
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670 if not enabled: |
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671 return |
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672 |
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673 # There is overhead to starting and stopping the background threads. |
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674 # Don't do background processing unless the file count is large enough |
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675 # to justify it. |
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676 minfilecount = ui.configint(b'worker', b'backgroundcloseminfilecount') |
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677 # FUTURE dynamically start background threads after minfilecount closes. |
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678 # (We don't currently have any callers that don't know their file count) |
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679 if expectedcount > 0 and expectedcount < minfilecount: |
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680 return |
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681 |
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682 maxqueue = ui.configint(b'worker', b'backgroundclosemaxqueue') |
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683 threadcount = ui.configint(b'worker', b'backgroundclosethreadcount') |
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684 |
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685 ui.debug( |
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686 b'starting %d threads for background file closing\n' % threadcount |
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687 ) |
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688 |
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689 self._queue = pycompat.queue.Queue(maxsize=maxqueue) |
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690 self._running = True |
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691 |
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692 for i in range(threadcount): |
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693 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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694 self._threads.append(t) |
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695 t.start() |
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696 |
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697 def __enter__(self): |
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698 self._entered = True |
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699 return self |
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700 |
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701 def __exit__(self, exc_type, exc_value, exc_tb): |
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702 self._running = False |
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703 |
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704 # Wait for threads to finish closing so open files don't linger for |
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705 # longer than lifetime of context manager. |
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706 for t in self._threads: |
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707 t.join() |
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708 |
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709 def _worker(self): |
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710 """Main routine for worker thread.""" |
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711 while True: |
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712 try: |
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713 fh = self._queue.get(block=True, timeout=0.100) |
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714 # Need to catch or the thread will terminate and |
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715 # we could orphan file descriptors. |
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716 try: |
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717 fh.close() |
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718 except Exception as e: |
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719 # Stash so can re-raise from main thread later. |
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720 self._threadexception = e |
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721 except pycompat.queue.Empty: |
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722 if not self._running: |
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723 break |
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724 |
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725 def close(self, fh): |
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726 """Schedule a file for closing.""" |
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727 if not self._entered: |
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728 raise error.Abort( |
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729 _(b'can only call close() when context manager active') |
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730 ) |
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731 |
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732 # If a background thread encountered an exception, raise now so we fail |
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733 # fast. Otherwise we may potentially go on for minutes until the error |
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734 # is acted on. |
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735 if self._threadexception: |
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736 e = self._threadexception |
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737 self._threadexception = None |
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738 raise e |
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739 |
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740 # If we're not actively running, close synchronously. |
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741 if not self._running: |
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742 fh.close() |
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743 return |
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744 |
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745 self._queue.put(fh, block=True, timeout=None) |
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746 |
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747 |
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748 class checkambigatclosing(closewrapbase): |
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749 """Proxy for a file object, to avoid ambiguity of file stat |
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750 |
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751 See also util.filestat for detail about "ambiguity of file stat". |
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752 |
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753 This proxy is useful only if the target file is guarded by any |
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754 lock (e.g. repo.lock or repo.wlock) |
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755 |
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756 Do not instantiate outside of the vfs layer. |
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757 """ |
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758 |
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759 def __init__(self, fh): |
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760 super(checkambigatclosing, self).__init__(fh) |
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761 object.__setattr__(self, '_oldstat', util.filestat.frompath(fh.name)) |
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762 |
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763 def _checkambig(self): |
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764 oldstat = self._oldstat |
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765 if oldstat.stat: |
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766 _avoidambig(self._origfh.name, oldstat) |
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767 |
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768 def __exit__(self, exc_type, exc_value, exc_tb): |
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769 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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770 self._checkambig() |
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771 |
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772 def close(self): |
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773 self._origfh.close() |
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774 self._checkambig() |