Mercurial > hg
annotate mercurial/vfs.py @ 31254:2140e12d3258
fileset: drop false function signatures from revs() and status() docs
They should be inserted by @predicate helper.
author | Yuya Nishihara <yuya@tcha.org> |
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date | Thu, 09 Mar 2017 00:07:13 +0900 |
parents | 0f31830fbfc4 |
children | 8908f985570c |
rev | line source |
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31217
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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 error, |
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20 osutil, |
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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 class abstractvfs(object): |
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27 """Abstract base class; cannot be instantiated""" |
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28 |
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29 def __init__(self, *args, **kwargs): |
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30 '''Prevent instantiation; don't call this from subclasses.''' |
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31 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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32 |
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33 def tryread(self, path): |
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34 '''gracefully return an empty string for missing files''' |
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35 try: |
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36 return self.read(path) |
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37 except IOError as inst: |
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38 if inst.errno != errno.ENOENT: |
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39 raise |
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40 return "" |
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41 |
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42 def tryreadlines(self, path, mode='rb'): |
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43 '''gracefully return an empty array for missing files''' |
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44 try: |
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45 return self.readlines(path, mode=mode) |
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46 except IOError as inst: |
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47 if inst.errno != errno.ENOENT: |
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48 raise |
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49 return [] |
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50 |
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51 @util.propertycache |
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52 def open(self): |
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53 '''Open ``path`` file, which is relative to vfs root. |
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54 |
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55 Newly created directories are marked as "not to be indexed by |
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56 the content indexing service", if ``notindexed`` is specified |
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57 for "write" mode access. |
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58 ''' |
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59 return self.__call__ |
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60 |
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61 def read(self, path): |
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62 with self(path, 'rb') as fp: |
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63 return fp.read() |
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64 |
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65 def readlines(self, path, mode='rb'): |
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66 with self(path, mode=mode) as fp: |
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67 return fp.readlines() |
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68 |
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69 def write(self, path, data, backgroundclose=False): |
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70 with self(path, 'wb', backgroundclose=backgroundclose) as fp: |
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71 return fp.write(data) |
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72 |
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73 def writelines(self, path, data, mode='wb', notindexed=False): |
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74 with self(path, mode=mode, notindexed=notindexed) as fp: |
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75 return fp.writelines(data) |
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76 |
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77 def append(self, path, data): |
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78 with self(path, 'ab') as fp: |
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79 return fp.write(data) |
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80 |
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81 def basename(self, path): |
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82 """return base element of a path (as os.path.basename would do) |
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83 |
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84 This exists to allow handling of strange encoding if needed.""" |
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85 return os.path.basename(path) |
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86 |
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87 def chmod(self, path, mode): |
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88 return os.chmod(self.join(path), mode) |
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89 |
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90 def dirname(self, path): |
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91 """return dirname element of a path (as os.path.dirname would do) |
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92 |
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93 This exists to allow handling of strange encoding if needed.""" |
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94 return os.path.dirname(path) |
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95 |
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96 def exists(self, path=None): |
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97 return os.path.exists(self.join(path)) |
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98 |
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99 def fstat(self, fp): |
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100 return util.fstat(fp) |
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101 |
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102 def isdir(self, path=None): |
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103 return os.path.isdir(self.join(path)) |
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104 |
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105 def isfile(self, path=None): |
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106 return os.path.isfile(self.join(path)) |
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107 |
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108 def islink(self, path=None): |
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109 return os.path.islink(self.join(path)) |
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110 |
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111 def isfileorlink(self, path=None): |
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112 '''return whether path is a regular file or a symlink |
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113 |
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114 Unlike isfile, this doesn't follow symlinks.''' |
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115 try: |
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116 st = self.lstat(path) |
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117 except OSError: |
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118 return False |
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119 mode = st.st_mode |
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120 return stat.S_ISREG(mode) or stat.S_ISLNK(mode) |
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121 |
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122 def reljoin(self, *paths): |
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123 """join various elements of a path together (as os.path.join would do) |
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124 |
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125 The vfs base is not injected so that path stay relative. This exists |
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126 to allow handling of strange encoding if needed.""" |
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127 return os.path.join(*paths) |
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128 |
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129 def split(self, path): |
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130 """split top-most element of a path (as os.path.split would do) |
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131 |
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132 This exists to allow handling of strange encoding if needed.""" |
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133 return os.path.split(path) |
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134 |
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135 def lexists(self, path=None): |
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136 return os.path.lexists(self.join(path)) |
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137 |
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138 def lstat(self, path=None): |
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139 return os.lstat(self.join(path)) |
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140 |
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141 def listdir(self, path=None): |
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142 return os.listdir(self.join(path)) |
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143 |
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144 def makedir(self, path=None, notindexed=True): |
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145 return util.makedir(self.join(path), notindexed) |
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146 |
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147 def makedirs(self, path=None, mode=None): |
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148 return util.makedirs(self.join(path), mode) |
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149 |
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150 def makelock(self, info, path): |
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151 return util.makelock(info, self.join(path)) |
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152 |
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153 def mkdir(self, path=None): |
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154 return os.mkdir(self.join(path)) |
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155 |
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156 def mkstemp(self, suffix='', prefix='tmp', dir=None, text=False): |
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157 fd, name = tempfile.mkstemp(suffix=suffix, prefix=prefix, |
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158 dir=self.join(dir), text=text) |
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159 dname, fname = util.split(name) |
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160 if dir: |
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161 return fd, os.path.join(dir, fname) |
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162 else: |
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163 return fd, fname |
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164 |
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165 def readdir(self, path=None, stat=None, skip=None): |
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166 return osutil.listdir(self.join(path), stat, skip) |
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167 |
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168 def readlock(self, path): |
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169 return util.readlock(self.join(path)) |
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170 |
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171 def rename(self, src, dst, checkambig=False): |
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172 """Rename from src to dst |
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173 |
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174 checkambig argument is used with util.filestat, and is useful |
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175 only if destination file is guarded by any lock |
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176 (e.g. repo.lock or repo.wlock). |
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177 """ |
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178 dstpath = self.join(dst) |
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179 oldstat = checkambig and util.filestat(dstpath) |
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180 if oldstat and oldstat.stat: |
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181 ret = util.rename(self.join(src), dstpath) |
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182 newstat = util.filestat(dstpath) |
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183 if newstat.isambig(oldstat): |
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184 # stat of renamed file is ambiguous to original one |
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185 newstat.avoidambig(dstpath, oldstat) |
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186 return ret |
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187 return util.rename(self.join(src), dstpath) |
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188 |
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189 def readlink(self, path): |
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190 return os.readlink(self.join(path)) |
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191 |
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192 def removedirs(self, path=None): |
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193 """Remove a leaf directory and all empty intermediate ones |
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194 """ |
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195 return util.removedirs(self.join(path)) |
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196 |
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197 def rmtree(self, path=None, ignore_errors=False, forcibly=False): |
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198 """Remove a directory tree recursively |
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199 |
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200 If ``forcibly``, this tries to remove READ-ONLY files, too. |
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201 """ |
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202 if forcibly: |
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203 def onerror(function, path, excinfo): |
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204 if function is not os.remove: |
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205 raise |
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206 # read-only files cannot be unlinked under Windows |
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207 s = os.stat(path) |
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208 if (s.st_mode & stat.S_IWRITE) != 0: |
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209 raise |
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210 os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE) |
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211 os.remove(path) |
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212 else: |
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213 onerror = None |
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214 return shutil.rmtree(self.join(path), |
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215 ignore_errors=ignore_errors, onerror=onerror) |
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216 |
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217 def setflags(self, path, l, x): |
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218 return util.setflags(self.join(path), l, x) |
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219 |
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220 def stat(self, path=None): |
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221 return os.stat(self.join(path)) |
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222 |
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223 def unlink(self, path=None): |
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224 return util.unlink(self.join(path)) |
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225 |
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226 def unlinkpath(self, path=None, ignoremissing=False): |
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227 return util.unlinkpath(self.join(path), ignoremissing) |
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228 |
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229 def utime(self, path=None, t=None): |
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230 return os.utime(self.join(path), t) |
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231 |
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233 """Yield (dirpath, dirs, files) tuple for each directories under path | |
234 | |
235 ``dirpath`` is relative one from the root of this vfs. This | |
236 uses ``os.sep`` as path separator, even you specify POSIX | |
237 style ``path``. | |
238 | |
239 "The root of this vfs" is represented as empty ``dirpath``. | |
240 """ | |
241 root = os.path.normpath(self.join(None)) | |
242 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
243 # because len(dirpath) < prefixlen. | |
244 prefixlen = len(pathutil.normasprefix(root)) | |
245 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
246 yield (dirpath[prefixlen:], dirs, files) | |
247 | |
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248 @contextlib.contextmanager |
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249 def backgroundclosing(self, ui, expectedcount=-1): |
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250 """Allow files to be closed asynchronously. |
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251 |
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252 When this context manager is active, ``backgroundclose`` can be passed |
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253 to ``__call__``/``open`` to result in the file possibly being closed |
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254 asynchronously, on a background thread. |
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255 """ |
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256 # This is an arbitrary restriction and could be changed if we ever |
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257 # have a use case. |
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258 vfs = getattr(self, 'vfs', self) |
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259 if getattr(vfs, '_backgroundfilecloser', None): |
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260 raise error.Abort( |
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261 _('can only have 1 active background file closer')) |
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262 |
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263 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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264 try: |
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265 vfs._backgroundfilecloser = bfc |
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266 yield bfc |
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267 finally: |
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268 vfs._backgroundfilecloser = None |
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269 |
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270 class vfs(abstractvfs): |
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271 '''Operate files relative to a base directory |
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272 |
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273 This class is used to hide the details of COW semantics and |
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274 remote file access from higher level code. |
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275 ''' |
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276 def __init__(self, base, audit=True, expandpath=False, realpath=False): |
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277 if expandpath: |
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278 base = util.expandpath(base) |
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279 if realpath: |
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280 base = os.path.realpath(base) |
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281 self.base = base |
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282 self.mustaudit = audit |
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283 self.createmode = None |
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284 self._trustnlink = None |
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285 |
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286 @property |
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287 def mustaudit(self): |
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288 return self._audit |
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289 |
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290 @mustaudit.setter |
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291 def mustaudit(self, onoff): |
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292 self._audit = onoff |
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293 if onoff: |
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294 self.audit = pathutil.pathauditor(self.base) |
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295 else: |
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296 self.audit = util.always |
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297 |
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298 @util.propertycache |
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299 def _cansymlink(self): |
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300 return util.checklink(self.base) |
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301 |
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302 @util.propertycache |
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303 def _chmod(self): |
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304 return util.checkexec(self.base) |
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305 |
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306 def _fixfilemode(self, name): |
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307 if self.createmode is None or not self._chmod: |
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308 return |
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309 os.chmod(name, self.createmode & 0o666) |
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310 |
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311 def __call__(self, path, mode="r", text=False, atomictemp=False, |
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312 notindexed=False, backgroundclose=False, checkambig=False): |
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313 '''Open ``path`` file, which is relative to vfs root. |
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314 |
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315 Newly created directories are marked as "not to be indexed by |
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316 the content indexing service", if ``notindexed`` is specified |
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317 for "write" mode access. |
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318 |
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319 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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320 It can only be used if the ``self.backgroundclosing()`` context manager |
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321 is active. This should only be specified if the following criteria hold: |
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322 |
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323 1. There is a potential for writing thousands of files. Unless you |
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324 are writing thousands of files, the performance benefits of |
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325 asynchronously closing files is not realized. |
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326 2. Files are opened exactly once for the ``backgroundclosing`` |
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327 active duration and are therefore free of race conditions between |
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328 closing a file on a background thread and reopening it. (If the |
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329 file were opened multiple times, there could be unflushed data |
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330 because the original file handle hasn't been flushed/closed yet.) |
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331 |
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332 ``checkambig`` argument is passed to atomictemplfile (valid |
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333 only for writing), and is useful only if target file is |
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334 guarded by any lock (e.g. repo.lock or repo.wlock). |
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335 ''' |
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336 if self._audit: |
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337 r = util.checkosfilename(path) |
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338 if r: |
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339 raise error.Abort("%s: %r" % (r, path)) |
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340 self.audit(path) |
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341 f = self.join(path) |
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342 |
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343 if not text and "b" not in mode: |
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344 mode += "b" # for that other OS |
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345 |
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346 nlink = -1 |
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347 if mode not in ('r', 'rb'): |
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348 dirname, basename = util.split(f) |
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349 # If basename is empty, then the path is malformed because it points |
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350 # to a directory. Let the posixfile() call below raise IOError. |
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351 if basename: |
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352 if atomictemp: |
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353 util.makedirs(dirname, self.createmode, notindexed) |
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354 return util.atomictempfile(f, mode, self.createmode, |
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355 checkambig=checkambig) |
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356 try: |
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357 if 'w' in mode: |
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358 util.unlink(f) |
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359 nlink = 0 |
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360 else: |
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361 # nlinks() may behave differently for files on Windows |
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362 # shares if the file is open. |
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363 with util.posixfile(f): |
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364 nlink = util.nlinks(f) |
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365 if nlink < 1: |
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366 nlink = 2 # force mktempcopy (issue1922) |
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367 except (OSError, IOError) as e: |
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368 if e.errno != errno.ENOENT: |
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369 raise |
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370 nlink = 0 |
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371 util.makedirs(dirname, self.createmode, notindexed) |
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372 if nlink > 0: |
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373 if self._trustnlink is None: |
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374 self._trustnlink = nlink > 1 or util.checknlink(f) |
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375 if nlink > 1 or not self._trustnlink: |
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376 util.rename(util.mktempcopy(f), f) |
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377 fp = util.posixfile(f, mode) |
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378 if nlink == 0: |
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379 self._fixfilemode(f) |
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380 |
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381 if checkambig: |
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382 if mode in ('r', 'rb'): |
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383 raise error.Abort(_('implementation error: mode %s is not' |
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384 ' valid for checkambig=True') % mode) |
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385 fp = checkambigatclosing(fp) |
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386 |
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387 if backgroundclose: |
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388 if not self._backgroundfilecloser: |
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389 raise error.Abort(_('backgroundclose can only be used when a ' |
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390 'backgroundclosing context manager is active') |
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391 ) |
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392 |
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393 fp = delayclosedfile(fp, self._backgroundfilecloser) |
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394 |
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395 return fp |
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396 |
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397 def symlink(self, src, dst): |
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398 self.audit(dst) |
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399 linkname = self.join(dst) |
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400 try: |
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401 os.unlink(linkname) |
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402 except OSError: |
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403 pass |
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404 |
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405 util.makedirs(os.path.dirname(linkname), self.createmode) |
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406 |
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407 if self._cansymlink: |
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408 try: |
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409 os.symlink(src, linkname) |
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410 except OSError as err: |
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411 raise OSError(err.errno, _('could not symlink to %r: %s') % |
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412 (src, err.strerror), linkname) |
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413 else: |
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414 self.write(dst, src) |
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415 |
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416 def join(self, path, *insidef): |
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417 if path: |
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418 return os.path.join(self.base, path, *insidef) |
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419 else: |
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420 return self.base |
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421 |
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422 opener = vfs |
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423 |
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424 class auditvfs(object): |
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425 def __init__(self, vfs): |
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426 self.vfs = vfs |
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427 |
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428 @property |
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429 def mustaudit(self): |
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430 return self.vfs.mustaudit |
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431 |
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432 @mustaudit.setter |
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433 def mustaudit(self, onoff): |
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434 self.vfs.mustaudit = onoff |
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435 |
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436 @property |
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437 def options(self): |
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438 return self.vfs.options |
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439 |
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440 @options.setter |
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441 def options(self, value): |
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442 self.vfs.options = value |
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443 |
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444 class filtervfs(abstractvfs, auditvfs): |
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445 '''Wrapper vfs for filtering filenames with a function.''' |
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446 |
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447 def __init__(self, vfs, filter): |
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448 auditvfs.__init__(self, vfs) |
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449 self._filter = filter |
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450 |
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451 def __call__(self, path, *args, **kwargs): |
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452 return self.vfs(self._filter(path), *args, **kwargs) |
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453 |
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454 def join(self, path, *insidef): |
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455 if path: |
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456 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
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457 else: |
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458 return self.vfs.join(path) |
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459 |
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460 filteropener = filtervfs |
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461 |
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462 class readonlyvfs(abstractvfs, auditvfs): |
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463 '''Wrapper vfs preventing any writing.''' |
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464 |
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465 def __init__(self, vfs): |
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466 auditvfs.__init__(self, vfs) |
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467 |
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468 def __call__(self, path, mode='r', *args, **kw): |
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469 if mode not in ('r', 'rb'): |
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470 raise error.Abort(_('this vfs is read only')) |
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471 return self.vfs(path, mode, *args, **kw) |
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472 |
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473 def join(self, path, *insidef): |
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474 return self.vfs.join(path, *insidef) |
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475 |
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476 class closewrapbase(object): |
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477 """Base class of wrapper, which hooks closing |
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478 |
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479 Do not instantiate outside of the vfs layer. |
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480 """ |
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481 def __init__(self, fh): |
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482 object.__setattr__(self, '_origfh', fh) |
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483 |
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484 def __getattr__(self, attr): |
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485 return getattr(self._origfh, attr) |
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486 |
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487 def __setattr__(self, attr, value): |
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488 return setattr(self._origfh, attr, value) |
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489 |
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490 def __delattr__(self, attr): |
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491 return delattr(self._origfh, attr) |
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492 |
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493 def __enter__(self): |
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494 return self._origfh.__enter__() |
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495 |
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496 def __exit__(self, exc_type, exc_value, exc_tb): |
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497 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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498 |
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499 def close(self): |
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500 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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501 |
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502 class delayclosedfile(closewrapbase): |
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503 """Proxy for a file object whose close is delayed. |
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504 |
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505 Do not instantiate outside of the vfs layer. |
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506 """ |
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507 def __init__(self, fh, closer): |
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508 super(delayclosedfile, self).__init__(fh) |
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509 object.__setattr__(self, '_closer', closer) |
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510 |
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511 def __exit__(self, exc_type, exc_value, exc_tb): |
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512 self._closer.close(self._origfh) |
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513 |
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514 def close(self): |
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515 self._closer.close(self._origfh) |
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516 |
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517 class backgroundfilecloser(object): |
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518 """Coordinates background closing of file handles on multiple threads.""" |
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519 def __init__(self, ui, expectedcount=-1): |
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520 self._running = False |
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521 self._entered = False |
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522 self._threads = [] |
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523 self._threadexception = None |
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524 |
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525 # Only Windows/NTFS has slow file closing. So only enable by default |
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526 # on that platform. But allow to be enabled elsewhere for testing. |
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527 defaultenabled = pycompat.osname == 'nt' |
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528 enabled = ui.configbool('worker', 'backgroundclose', defaultenabled) |
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529 |
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530 if not enabled: |
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531 return |
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532 |
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533 # There is overhead to starting and stopping the background threads. |
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534 # Don't do background processing unless the file count is large enough |
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535 # to justify it. |
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536 minfilecount = ui.configint('worker', 'backgroundcloseminfilecount', |
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537 2048) |
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538 # FUTURE dynamically start background threads after minfilecount closes. |
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539 # (We don't currently have any callers that don't know their file count) |
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540 if expectedcount > 0 and expectedcount < minfilecount: |
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541 return |
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542 |
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543 # Windows defaults to a limit of 512 open files. A buffer of 128 |
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544 # should give us enough headway. |
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545 maxqueue = ui.configint('worker', 'backgroundclosemaxqueue', 384) |
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546 threadcount = ui.configint('worker', 'backgroundclosethreadcount', 4) |
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547 |
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548 ui.debug('starting %d threads for background file closing\n' % |
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549 threadcount) |
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550 |
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551 self._queue = util.queue(maxsize=maxqueue) |
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552 self._running = True |
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553 |
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554 for i in range(threadcount): |
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555 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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556 self._threads.append(t) |
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557 t.start() |
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558 |
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559 def __enter__(self): |
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560 self._entered = True |
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561 return self |
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562 |
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563 def __exit__(self, exc_type, exc_value, exc_tb): |
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564 self._running = False |
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565 |
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566 # Wait for threads to finish closing so open files don't linger for |
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567 # longer than lifetime of context manager. |
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568 for t in self._threads: |
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569 t.join() |
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570 |
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571 def _worker(self): |
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572 """Main routine for worker thread.""" |
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573 while True: |
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574 try: |
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575 fh = self._queue.get(block=True, timeout=0.100) |
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576 # Need to catch or the thread will terminate and |
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577 # we could orphan file descriptors. |
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578 try: |
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579 fh.close() |
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580 except Exception as e: |
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581 # Stash so can re-raise from main thread later. |
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582 self._threadexception = e |
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583 except util.empty: |
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584 if not self._running: |
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585 break |
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586 |
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587 def close(self, fh): |
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588 """Schedule a file for closing.""" |
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589 if not self._entered: |
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590 raise error.Abort(_('can only call close() when context manager ' |
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591 'active')) |
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592 |
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593 # If a background thread encountered an exception, raise now so we fail |
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594 # fast. Otherwise we may potentially go on for minutes until the error |
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595 # is acted on. |
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596 if self._threadexception: |
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597 e = self._threadexception |
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598 self._threadexception = None |
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599 raise e |
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600 |
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601 # If we're not actively running, close synchronously. |
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602 if not self._running: |
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603 fh.close() |
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604 return |
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605 |
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606 self._queue.put(fh, block=True, timeout=None) |
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607 |
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608 class checkambigatclosing(closewrapbase): |
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609 """Proxy for a file object, to avoid ambiguity of file stat |
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610 |
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611 See also util.filestat for detail about "ambiguity of file stat". |
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612 |
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613 This proxy is useful only if the target file is guarded by any |
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614 lock (e.g. repo.lock or repo.wlock) |
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615 |
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616 Do not instantiate outside of the vfs layer. |
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617 """ |
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618 def __init__(self, fh): |
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619 super(checkambigatclosing, self).__init__(fh) |
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620 object.__setattr__(self, '_oldstat', util.filestat(fh.name)) |
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621 |
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622 def _checkambig(self): |
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623 oldstat = self._oldstat |
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624 if oldstat.stat: |
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625 newstat = util.filestat(self._origfh.name) |
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626 if newstat.isambig(oldstat): |
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627 # stat of changed file is ambiguous to original one |
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628 newstat.avoidambig(self._origfh.name, oldstat) |
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629 |
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630 def __exit__(self, exc_type, exc_value, exc_tb): |
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631 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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632 self._checkambig() |
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633 |
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634 def close(self): |
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635 self._origfh.close() |
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636 self._checkambig() |