Mercurial > hg
annotate mercurial/vfs.py @ 31957:84f9eb9758c0
atexit: test failing handlers
author | Bryan O'Sullivan <bryano@fb.com> |
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date | Tue, 11 Apr 2017 14:54:12 -0700 |
parents | f80d9ddc40f3 |
children | d74b0cff94a9 20bac46f7744 |
rev | line source |
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vfs: extract 'vfs' class and related code to a new 'vfs' module (API)
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1 # vfs.py - Mercurial 'vfs' classes |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 from __future__ import absolute_import |
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8 |
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9 import contextlib |
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10 import errno |
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11 import os |
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12 import shutil |
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13 import stat |
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14 import tempfile |
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15 import threading |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 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 |
31542 | 226 def tryunlink(self, path=None): |
227 """Attempt to remove a file, ignoring missing file errors.""" | |
228 util.tryunlink(self.join(path)) | |
229 | |
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230 def unlinkpath(self, path=None, ignoremissing=False): |
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231 return util.unlinkpath(self.join(path), ignoremissing=ignoremissing) |
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232 |
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233 def utime(self, path=None, t=None): |
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234 return os.utime(self.join(path), t) |
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235 |
24725 | 236 def walk(self, path=None, onerror=None): |
237 """Yield (dirpath, dirs, files) tuple for each directories under path | |
238 | |
239 ``dirpath`` is relative one from the root of this vfs. This | |
240 uses ``os.sep`` as path separator, even you specify POSIX | |
241 style ``path``. | |
242 | |
243 "The root of this vfs" is represented as empty ``dirpath``. | |
244 """ | |
245 root = os.path.normpath(self.join(None)) | |
246 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
247 # because len(dirpath) < prefixlen. | |
248 prefixlen = len(pathutil.normasprefix(root)) | |
249 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
250 yield (dirpath[prefixlen:], dirs, files) | |
251 | |
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252 @contextlib.contextmanager |
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253 def backgroundclosing(self, ui, expectedcount=-1): |
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254 """Allow files to be closed asynchronously. |
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255 |
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256 When this context manager is active, ``backgroundclose`` can be passed |
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257 to ``__call__``/``open`` to result in the file possibly being closed |
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258 asynchronously, on a background thread. |
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259 """ |
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260 # This is an arbitrary restriction and could be changed if we ever |
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261 # have a use case. |
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262 vfs = getattr(self, 'vfs', self) |
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263 if getattr(vfs, '_backgroundfilecloser', None): |
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264 raise error.Abort( |
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265 _('can only have 1 active background file closer')) |
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266 |
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267 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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268 try: |
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269 vfs._backgroundfilecloser = bfc |
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270 yield bfc |
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271 finally: |
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272 vfs._backgroundfilecloser = None |
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273 |
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274 class vfs(abstractvfs): |
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275 '''Operate files relative to a base directory |
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276 |
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277 This class is used to hide the details of COW semantics and |
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278 remote file access from higher level code. |
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279 ''' |
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280 def __init__(self, base, audit=True, expandpath=False, realpath=False): |
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281 if expandpath: |
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282 base = util.expandpath(base) |
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283 if realpath: |
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284 base = os.path.realpath(base) |
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285 self.base = base |
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286 self.mustaudit = audit |
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287 self.createmode = None |
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288 self._trustnlink = None |
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289 |
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290 @property |
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291 def mustaudit(self): |
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292 return self._audit |
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293 |
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294 @mustaudit.setter |
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295 def mustaudit(self, onoff): |
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296 self._audit = onoff |
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297 if onoff: |
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298 self.audit = pathutil.pathauditor(self.base) |
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299 else: |
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300 self.audit = util.always |
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301 |
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302 @util.propertycache |
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303 def _cansymlink(self): |
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304 return util.checklink(self.base) |
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305 |
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306 @util.propertycache |
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307 def _chmod(self): |
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308 return util.checkexec(self.base) |
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309 |
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310 def _fixfilemode(self, name): |
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311 if self.createmode is None or not self._chmod: |
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312 return |
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313 os.chmod(name, self.createmode & 0o666) |
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314 |
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315 def __call__(self, path, mode="r", text=False, atomictemp=False, |
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316 notindexed=False, backgroundclose=False, checkambig=False): |
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317 '''Open ``path`` file, which is relative to vfs root. |
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318 |
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319 Newly created directories are marked as "not to be indexed by |
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320 the content indexing service", if ``notindexed`` is specified |
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321 for "write" mode access. |
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322 |
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323 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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324 It can only be used if the ``self.backgroundclosing()`` context manager |
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325 is active. This should only be specified if the following criteria hold: |
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326 |
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327 1. There is a potential for writing thousands of files. Unless you |
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328 are writing thousands of files, the performance benefits of |
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329 asynchronously closing files is not realized. |
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330 2. Files are opened exactly once for the ``backgroundclosing`` |
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331 active duration and are therefore free of race conditions between |
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332 closing a file on a background thread and reopening it. (If the |
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333 file were opened multiple times, there could be unflushed data |
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334 because the original file handle hasn't been flushed/closed yet.) |
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335 |
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336 ``checkambig`` argument is passed to atomictemplfile (valid |
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337 only for writing), and is useful only if target file is |
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338 guarded by any lock (e.g. repo.lock or repo.wlock). |
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339 ''' |
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340 if self._audit: |
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341 r = util.checkosfilename(path) |
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342 if r: |
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343 raise error.Abort("%s: %r" % (r, path)) |
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344 self.audit(path) |
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345 f = self.join(path) |
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346 |
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347 if not text and "b" not in mode: |
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348 mode += "b" # for that other OS |
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349 |
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350 nlink = -1 |
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351 if mode not in ('r', 'rb'): |
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352 dirname, basename = util.split(f) |
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353 # If basename is empty, then the path is malformed because it points |
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354 # to a directory. Let the posixfile() call below raise IOError. |
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355 if basename: |
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356 if atomictemp: |
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357 util.makedirs(dirname, self.createmode, notindexed) |
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358 return util.atomictempfile(f, mode, self.createmode, |
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359 checkambig=checkambig) |
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360 try: |
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361 if 'w' in mode: |
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362 util.unlink(f) |
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363 nlink = 0 |
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364 else: |
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365 # nlinks() may behave differently for files on Windows |
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366 # shares if the file is open. |
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367 with util.posixfile(f): |
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368 nlink = util.nlinks(f) |
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369 if nlink < 1: |
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370 nlink = 2 # force mktempcopy (issue1922) |
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371 except (OSError, IOError) as e: |
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372 if e.errno != errno.ENOENT: |
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373 raise |
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374 nlink = 0 |
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375 util.makedirs(dirname, self.createmode, notindexed) |
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376 if nlink > 0: |
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377 if self._trustnlink is None: |
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378 self._trustnlink = nlink > 1 or util.checknlink(f) |
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379 if nlink > 1 or not self._trustnlink: |
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380 util.rename(util.mktempcopy(f), f) |
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381 fp = util.posixfile(f, mode) |
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382 if nlink == 0: |
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383 self._fixfilemode(f) |
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384 |
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385 if checkambig: |
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386 if mode in ('r', 'rb'): |
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387 raise error.Abort(_('implementation error: mode %s is not' |
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388 ' valid for checkambig=True') % mode) |
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389 fp = checkambigatclosing(fp) |
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390 |
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391 if backgroundclose: |
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392 if not self._backgroundfilecloser: |
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393 raise error.Abort(_('backgroundclose can only be used when a ' |
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394 'backgroundclosing context manager is active') |
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395 ) |
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396 |
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397 fp = delayclosedfile(fp, self._backgroundfilecloser) |
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398 |
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399 return fp |
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400 |
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401 def symlink(self, src, dst): |
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402 self.audit(dst) |
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403 linkname = self.join(dst) |
31549 | 404 util.tryunlink(linkname) |
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405 |
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406 util.makedirs(os.path.dirname(linkname), self.createmode) |
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407 |
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408 if self._cansymlink: |
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409 try: |
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410 os.symlink(src, linkname) |
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411 except OSError as err: |
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412 raise OSError(err.errno, _('could not symlink to %r: %s') % |
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413 (src, err.strerror), linkname) |
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414 else: |
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415 self.write(dst, src) |
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416 |
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417 def join(self, path, *insidef): |
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418 if path: |
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419 return os.path.join(self.base, path, *insidef) |
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420 else: |
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421 return self.base |
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422 |
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423 opener = vfs |
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424 |
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425 class auditvfs(object): |
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426 def __init__(self, vfs): |
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427 self.vfs = vfs |
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428 |
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429 @property |
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430 def mustaudit(self): |
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431 return self.vfs.mustaudit |
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432 |
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433 @mustaudit.setter |
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434 def mustaudit(self, onoff): |
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435 self.vfs.mustaudit = onoff |
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436 |
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437 @property |
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438 def options(self): |
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439 return self.vfs.options |
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440 |
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441 @options.setter |
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442 def options(self, value): |
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443 self.vfs.options = value |
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444 |
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445 class filtervfs(abstractvfs, auditvfs): |
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446 '''Wrapper vfs for filtering filenames with a function.''' |
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447 |
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448 def __init__(self, vfs, filter): |
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449 auditvfs.__init__(self, vfs) |
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450 self._filter = filter |
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451 |
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452 def __call__(self, path, *args, **kwargs): |
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453 return self.vfs(self._filter(path), *args, **kwargs) |
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454 |
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455 def join(self, path, *insidef): |
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456 if path: |
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457 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
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458 else: |
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459 return self.vfs.join(path) |
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460 |
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461 filteropener = filtervfs |
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462 |
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463 class readonlyvfs(abstractvfs, auditvfs): |
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464 '''Wrapper vfs preventing any writing.''' |
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465 |
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466 def __init__(self, vfs): |
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467 auditvfs.__init__(self, vfs) |
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468 |
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469 def __call__(self, path, mode='r', *args, **kw): |
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470 if mode not in ('r', 'rb'): |
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471 raise error.Abort(_('this vfs is read only')) |
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472 return self.vfs(path, mode, *args, **kw) |
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473 |
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474 def join(self, path, *insidef): |
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475 return self.vfs.join(path, *insidef) |
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476 |
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477 class closewrapbase(object): |
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478 """Base class of wrapper, which hooks closing |
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479 |
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480 Do not instantiate outside of the vfs layer. |
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481 """ |
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482 def __init__(self, fh): |
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483 object.__setattr__(self, r'_origfh', fh) |
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484 |
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485 def __getattr__(self, attr): |
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486 return getattr(self._origfh, attr) |
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487 |
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488 def __setattr__(self, attr, value): |
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489 return setattr(self._origfh, attr, value) |
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490 |
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491 def __delattr__(self, attr): |
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492 return delattr(self._origfh, attr) |
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493 |
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494 def __enter__(self): |
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495 return self._origfh.__enter__() |
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496 |
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497 def __exit__(self, exc_type, exc_value, exc_tb): |
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498 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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499 |
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500 def close(self): |
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501 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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502 |
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503 class delayclosedfile(closewrapbase): |
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504 """Proxy for a file object whose close is delayed. |
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505 |
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506 Do not instantiate outside of the vfs layer. |
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507 """ |
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508 def __init__(self, fh, closer): |
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509 super(delayclosedfile, self).__init__(fh) |
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510 object.__setattr__(self, r'_closer', closer) |
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511 |
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512 def __exit__(self, exc_type, exc_value, exc_tb): |
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513 self._closer.close(self._origfh) |
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514 |
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515 def close(self): |
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516 self._closer.close(self._origfh) |
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517 |
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518 class backgroundfilecloser(object): |
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519 """Coordinates background closing of file handles on multiple threads.""" |
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520 def __init__(self, ui, expectedcount=-1): |
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521 self._running = False |
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522 self._entered = False |
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523 self._threads = [] |
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524 self._threadexception = None |
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525 |
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526 # Only Windows/NTFS has slow file closing. So only enable by default |
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527 # on that platform. But allow to be enabled elsewhere for testing. |
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528 defaultenabled = pycompat.osname == 'nt' |
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529 enabled = ui.configbool('worker', 'backgroundclose', defaultenabled) |
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530 |
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531 if not enabled: |
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532 return |
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533 |
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534 # There is overhead to starting and stopping the background threads. |
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535 # Don't do background processing unless the file count is large enough |
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536 # to justify it. |
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537 minfilecount = ui.configint('worker', 'backgroundcloseminfilecount', |
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538 2048) |
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539 # FUTURE dynamically start background threads after minfilecount closes. |
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540 # (We don't currently have any callers that don't know their file count) |
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541 if expectedcount > 0 and expectedcount < minfilecount: |
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542 return |
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543 |
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544 # Windows defaults to a limit of 512 open files. A buffer of 128 |
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545 # should give us enough headway. |
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546 maxqueue = ui.configint('worker', 'backgroundclosemaxqueue', 384) |
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547 threadcount = ui.configint('worker', 'backgroundclosethreadcount', 4) |
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548 |
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549 ui.debug('starting %d threads for background file closing\n' % |
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550 threadcount) |
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551 |
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552 self._queue = util.queue(maxsize=maxqueue) |
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553 self._running = True |
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554 |
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555 for i in range(threadcount): |
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556 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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557 self._threads.append(t) |
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558 t.start() |
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559 |
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560 def __enter__(self): |
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561 self._entered = True |
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562 return self |
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563 |
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564 def __exit__(self, exc_type, exc_value, exc_tb): |
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565 self._running = False |
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566 |
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567 # Wait for threads to finish closing so open files don't linger for |
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568 # longer than lifetime of context manager. |
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569 for t in self._threads: |
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570 t.join() |
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571 |
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572 def _worker(self): |
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573 """Main routine for worker thread.""" |
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574 while True: |
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575 try: |
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576 fh = self._queue.get(block=True, timeout=0.100) |
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577 # Need to catch or the thread will terminate and |
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578 # we could orphan file descriptors. |
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579 try: |
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580 fh.close() |
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581 except Exception as e: |
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582 # Stash so can re-raise from main thread later. |
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583 self._threadexception = e |
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584 except util.empty: |
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585 if not self._running: |
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586 break |
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587 |
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588 def close(self, fh): |
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589 """Schedule a file for closing.""" |
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590 if not self._entered: |
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591 raise error.Abort(_('can only call close() when context manager ' |
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592 'active')) |
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593 |
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594 # If a background thread encountered an exception, raise now so we fail |
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595 # fast. Otherwise we may potentially go on for minutes until the error |
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596 # is acted on. |
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597 if self._threadexception: |
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598 e = self._threadexception |
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599 self._threadexception = None |
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600 raise e |
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601 |
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602 # If we're not actively running, close synchronously. |
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603 if not self._running: |
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604 fh.close() |
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605 return |
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606 |
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607 self._queue.put(fh, block=True, timeout=None) |
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608 |
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609 class checkambigatclosing(closewrapbase): |
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610 """Proxy for a file object, to avoid ambiguity of file stat |
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611 |
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612 See also util.filestat for detail about "ambiguity of file stat". |
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613 |
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614 This proxy is useful only if the target file is guarded by any |
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615 lock (e.g. repo.lock or repo.wlock) |
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616 |
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617 Do not instantiate outside of the vfs layer. |
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618 """ |
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619 def __init__(self, fh): |
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620 super(checkambigatclosing, self).__init__(fh) |
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621 object.__setattr__(self, r'_oldstat', util.filestat(fh.name)) |
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622 |
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623 def _checkambig(self): |
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624 oldstat = self._oldstat |
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625 if oldstat.stat: |
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626 newstat = util.filestat(self._origfh.name) |
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627 if newstat.isambig(oldstat): |
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628 # stat of changed file is ambiguous to original one |
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629 newstat.avoidambig(self._origfh.name, oldstat) |
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630 |
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631 def __exit__(self, exc_type, exc_value, exc_tb): |
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632 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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633 self._checkambig() |
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634 |
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635 def close(self): |
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636 self._origfh.close() |
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637 self._checkambig() |