Mercurial > hg
annotate mercurial/vfs.py @ 36809:3c15b84ab66c
hgweb: teach WSGI parser about query strings
Currently, req.form uses cgi.parse() to populate form data. Depending
on the request, form data can come from POST multipart/form-data,
application/x-www-form-urlencoded, or the URL query string.
Putting all these things into one data structure makes it difficult
to reason about how exactly parameters got to the request. It can
lead to wonkiness such as pulling parameters from both the URL and
POST data.
This commit teaches our WSGI request parser about argument data
in query strings. We populate fields containing the query string
data and only the query string data so it can't be confused with
POST data.
Differential Revision: https://phab.mercurial-scm.org/D2737
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 08 Mar 2018 11:21:46 -0800 |
parents | 2a7e777c9eed |
children | 8fb9985382be |
rev | line source |
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vfs: extract 'vfs' class and related code to a new 'vfs' module (API)
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1 # vfs.py - Mercurial 'vfs' classes |
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2 # |
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3 # Copyright Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms of the |
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6 # GNU General Public License version 2 or any later version. |
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7 from __future__ import absolute_import |
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8 |
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9 import contextlib |
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10 import errno |
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11 import os |
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12 import shutil |
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13 import stat |
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14 import tempfile |
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15 import threading |
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16 |
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17 from .i18n import _ |
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18 from . import ( |
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19 encoding, |
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20 error, |
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21 pathutil, |
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22 pycompat, |
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23 util, |
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24 ) |
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25 |
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26 def _avoidambig(path, oldstat): |
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27 """Avoid file stat ambiguity forcibly |
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28 |
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29 This function causes copying ``path`` file, if it is owned by |
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30 another (see issue5418 and issue5584 for detail). |
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31 """ |
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32 def checkandavoid(): |
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33 newstat = util.filestat.frompath(path) |
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34 # return whether file stat ambiguity is (already) avoided |
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35 return (not newstat.isambig(oldstat) or |
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36 newstat.avoidambig(path, oldstat)) |
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37 if not checkandavoid(): |
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38 # simply copy to change owner of path to get privilege to |
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39 # advance mtime (see issue5418) |
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40 util.rename(util.mktempcopy(path), path) |
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41 checkandavoid() |
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42 |
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43 class abstractvfs(object): |
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44 """Abstract base class; cannot be instantiated""" |
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45 |
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46 def __init__(self, *args, **kwargs): |
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47 '''Prevent instantiation; don't call this from subclasses.''' |
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48 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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49 |
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50 def tryread(self, path): |
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51 '''gracefully return an empty string for missing files''' |
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52 try: |
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53 return self.read(path) |
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54 except IOError as inst: |
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55 if inst.errno != errno.ENOENT: |
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56 raise |
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57 return "" |
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58 |
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59 def tryreadlines(self, path, mode='rb'): |
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60 '''gracefully return an empty array for missing files''' |
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61 try: |
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62 return self.readlines(path, mode=mode) |
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63 except IOError as inst: |
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64 if inst.errno != errno.ENOENT: |
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65 raise |
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66 return [] |
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67 |
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68 @util.propertycache |
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69 def open(self): |
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70 '''Open ``path`` file, which is relative to vfs root. |
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71 |
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72 Newly created directories are marked as "not to be indexed by |
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73 the content indexing service", if ``notindexed`` is specified |
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74 for "write" mode access. |
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75 ''' |
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76 return self.__call__ |
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77 |
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78 def read(self, path): |
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79 with self(path, 'rb') as fp: |
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80 return fp.read() |
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81 |
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82 def readlines(self, path, mode='rb'): |
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83 with self(path, mode=mode) as fp: |
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84 return fp.readlines() |
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85 |
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86 def write(self, path, data, backgroundclose=False, **kwargs): |
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87 with self(path, 'wb', backgroundclose=backgroundclose, **kwargs) as fp: |
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88 return fp.write(data) |
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89 |
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90 def writelines(self, path, data, mode='wb', notindexed=False): |
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91 with self(path, mode=mode, notindexed=notindexed) as fp: |
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92 return fp.writelines(data) |
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93 |
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94 def append(self, path, data): |
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95 with self(path, 'ab') as fp: |
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96 return fp.write(data) |
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97 |
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98 def basename(self, path): |
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99 """return base element of a path (as os.path.basename would do) |
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100 |
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101 This exists to allow handling of strange encoding if needed.""" |
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102 return os.path.basename(path) |
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103 |
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104 def chmod(self, path, mode): |
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105 return os.chmod(self.join(path), mode) |
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106 |
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107 def dirname(self, path): |
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108 """return dirname element of a path (as os.path.dirname would do) |
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109 |
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110 This exists to allow handling of strange encoding if needed.""" |
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111 return os.path.dirname(path) |
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112 |
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113 def exists(self, path=None): |
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114 return os.path.exists(self.join(path)) |
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115 |
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116 def fstat(self, fp): |
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117 return util.fstat(fp) |
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118 |
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119 def isdir(self, path=None): |
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120 return os.path.isdir(self.join(path)) |
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121 |
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122 def isfile(self, path=None): |
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123 return os.path.isfile(self.join(path)) |
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124 |
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125 def islink(self, path=None): |
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126 return os.path.islink(self.join(path)) |
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127 |
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128 def isfileorlink(self, path=None): |
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129 '''return whether path is a regular file or a symlink |
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130 |
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131 Unlike isfile, this doesn't follow symlinks.''' |
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132 try: |
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133 st = self.lstat(path) |
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134 except OSError: |
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135 return False |
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136 mode = st.st_mode |
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137 return stat.S_ISREG(mode) or stat.S_ISLNK(mode) |
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138 |
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139 def reljoin(self, *paths): |
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140 """join various elements of a path together (as os.path.join would do) |
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141 |
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142 The vfs base is not injected so that path stay relative. This exists |
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143 to allow handling of strange encoding if needed.""" |
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144 return os.path.join(*paths) |
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145 |
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146 def split(self, path): |
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147 """split top-most element of a path (as os.path.split would do) |
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148 |
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149 This exists to allow handling of strange encoding if needed.""" |
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150 return os.path.split(path) |
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151 |
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152 def lexists(self, path=None): |
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153 return os.path.lexists(self.join(path)) |
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154 |
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155 def lstat(self, path=None): |
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156 return os.lstat(self.join(path)) |
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157 |
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158 def listdir(self, path=None): |
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159 return os.listdir(self.join(path)) |
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160 |
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161 def makedir(self, path=None, notindexed=True): |
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162 return util.makedir(self.join(path), notindexed) |
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163 |
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164 def makedirs(self, path=None, mode=None): |
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165 return util.makedirs(self.join(path), mode) |
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166 |
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167 def makelock(self, info, path): |
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168 return util.makelock(info, self.join(path)) |
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169 |
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170 def mkdir(self, path=None): |
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171 return os.mkdir(self.join(path)) |
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172 |
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173 def mkstemp(self, suffix='', prefix='tmp', dir=None): |
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174 fd, name = tempfile.mkstemp(suffix=suffix, prefix=prefix, |
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175 dir=self.join(dir)) |
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176 dname, fname = util.split(name) |
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177 if dir: |
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178 return fd, os.path.join(dir, fname) |
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179 else: |
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180 return fd, fname |
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181 |
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182 def readdir(self, path=None, stat=None, skip=None): |
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183 return util.listdir(self.join(path), stat, skip) |
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184 |
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185 def readlock(self, path): |
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186 return util.readlock(self.join(path)) |
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187 |
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188 def rename(self, src, dst, checkambig=False): |
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189 """Rename from src to dst |
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190 |
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191 checkambig argument is used with util.filestat, and is useful |
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192 only if destination file is guarded by any lock |
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193 (e.g. repo.lock or repo.wlock). |
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194 |
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195 To avoid file stat ambiguity forcibly, checkambig=True involves |
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196 copying ``src`` file, if it is owned by another. Therefore, use |
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197 checkambig=True only in limited cases (see also issue5418 and |
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198 issue5584 for detail). |
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199 """ |
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200 srcpath = self.join(src) |
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201 dstpath = self.join(dst) |
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202 oldstat = checkambig and util.filestat.frompath(dstpath) |
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203 if oldstat and oldstat.stat: |
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204 ret = util.rename(srcpath, dstpath) |
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205 _avoidambig(dstpath, oldstat) |
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206 return ret |
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207 return util.rename(srcpath, dstpath) |
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208 |
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209 def readlink(self, path): |
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210 return os.readlink(self.join(path)) |
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211 |
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212 def removedirs(self, path=None): |
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213 """Remove a leaf directory and all empty intermediate ones |
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214 """ |
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215 return util.removedirs(self.join(path)) |
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216 |
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217 def rmtree(self, path=None, ignore_errors=False, forcibly=False): |
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218 """Remove a directory tree recursively |
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219 |
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220 If ``forcibly``, this tries to remove READ-ONLY files, too. |
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221 """ |
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222 if forcibly: |
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223 def onerror(function, path, excinfo): |
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224 if function is not os.remove: |
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225 raise |
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226 # read-only files cannot be unlinked under Windows |
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227 s = os.stat(path) |
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228 if (s.st_mode & stat.S_IWRITE) != 0: |
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229 raise |
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230 os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE) |
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231 os.remove(path) |
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232 else: |
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233 onerror = None |
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234 return shutil.rmtree(self.join(path), |
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235 ignore_errors=ignore_errors, onerror=onerror) |
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236 |
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237 def setflags(self, path, l, x): |
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238 return util.setflags(self.join(path), l, x) |
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239 |
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240 def stat(self, path=None): |
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241 return os.stat(self.join(path)) |
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242 |
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243 def unlink(self, path=None): |
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244 return util.unlink(self.join(path)) |
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245 |
31542 | 246 def tryunlink(self, path=None): |
247 """Attempt to remove a file, ignoring missing file errors.""" | |
248 util.tryunlink(self.join(path)) | |
249 | |
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250 def unlinkpath(self, path=None, ignoremissing=False): |
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251 return util.unlinkpath(self.join(path), ignoremissing=ignoremissing) |
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252 |
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253 def utime(self, path=None, t=None): |
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254 return os.utime(self.join(path), t) |
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255 |
24725 | 256 def walk(self, path=None, onerror=None): |
257 """Yield (dirpath, dirs, files) tuple for each directories under path | |
258 | |
259 ``dirpath`` is relative one from the root of this vfs. This | |
260 uses ``os.sep`` as path separator, even you specify POSIX | |
261 style ``path``. | |
262 | |
263 "The root of this vfs" is represented as empty ``dirpath``. | |
264 """ | |
265 root = os.path.normpath(self.join(None)) | |
266 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
267 # because len(dirpath) < prefixlen. | |
268 prefixlen = len(pathutil.normasprefix(root)) | |
269 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
270 yield (dirpath[prefixlen:], dirs, files) | |
271 | |
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272 @contextlib.contextmanager |
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273 def backgroundclosing(self, ui, expectedcount=-1): |
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274 """Allow files to be closed asynchronously. |
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275 |
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276 When this context manager is active, ``backgroundclose`` can be passed |
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277 to ``__call__``/``open`` to result in the file possibly being closed |
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278 asynchronously, on a background thread. |
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279 """ |
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280 # Sharing backgroundfilecloser between threads is complex and using |
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281 # multiple instances puts us at risk of running out of file descriptors |
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282 # only allow to use backgroundfilecloser when in main thread. |
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283 if not isinstance(threading.currentThread(), threading._MainThread): |
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284 yield |
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285 return |
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286 vfs = getattr(self, 'vfs', self) |
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287 if getattr(vfs, '_backgroundfilecloser', None): |
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288 raise error.Abort( |
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289 _('can only have 1 active background file closer')) |
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290 |
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291 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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292 try: |
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293 vfs._backgroundfilecloser = bfc |
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294 yield bfc |
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295 finally: |
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296 vfs._backgroundfilecloser = None |
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297 |
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298 class vfs(abstractvfs): |
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299 '''Operate files relative to a base directory |
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300 |
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301 This class is used to hide the details of COW semantics and |
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302 remote file access from higher level code. |
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303 |
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304 'cacheaudited' should be enabled only if (a) vfs object is short-lived, or |
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305 (b) the base directory is managed by hg and considered sort-of append-only. |
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306 See pathutil.pathauditor() for details. |
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307 ''' |
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308 def __init__(self, base, audit=True, cacheaudited=False, expandpath=False, |
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309 realpath=False): |
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310 if expandpath: |
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311 base = util.expandpath(base) |
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312 if realpath: |
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313 base = os.path.realpath(base) |
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314 self.base = base |
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315 self._audit = audit |
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316 if audit: |
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317 self.audit = pathutil.pathauditor(self.base, cached=cacheaudited) |
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318 else: |
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319 self.audit = (lambda path, mode=None: True) |
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320 self.createmode = None |
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321 self._trustnlink = None |
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322 |
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323 @util.propertycache |
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324 def _cansymlink(self): |
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325 return util.checklink(self.base) |
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326 |
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327 @util.propertycache |
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328 def _chmod(self): |
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329 return util.checkexec(self.base) |
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330 |
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331 def _fixfilemode(self, name): |
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332 if self.createmode is None or not self._chmod: |
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333 return |
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334 os.chmod(name, self.createmode & 0o666) |
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335 |
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336 def __call__(self, path, mode="r", atomictemp=False, notindexed=False, |
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337 backgroundclose=False, checkambig=False, auditpath=True): |
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338 '''Open ``path`` file, which is relative to vfs root. |
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339 |
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340 Newly created directories are marked as "not to be indexed by |
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341 the content indexing service", if ``notindexed`` is specified |
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342 for "write" mode access. |
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343 |
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344 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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345 It can only be used if the ``self.backgroundclosing()`` context manager |
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346 is active. This should only be specified if the following criteria hold: |
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347 |
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348 1. There is a potential for writing thousands of files. Unless you |
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349 are writing thousands of files, the performance benefits of |
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350 asynchronously closing files is not realized. |
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351 2. Files are opened exactly once for the ``backgroundclosing`` |
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352 active duration and are therefore free of race conditions between |
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353 closing a file on a background thread and reopening it. (If the |
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354 file were opened multiple times, there could be unflushed data |
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355 because the original file handle hasn't been flushed/closed yet.) |
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356 |
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357 ``checkambig`` argument is passed to atomictemplfile (valid |
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358 only for writing), and is useful only if target file is |
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359 guarded by any lock (e.g. repo.lock or repo.wlock). |
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360 |
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361 To avoid file stat ambiguity forcibly, checkambig=True involves |
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362 copying ``path`` file opened in "append" mode (e.g. for |
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363 truncation), if it is owned by another. Therefore, use |
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364 combination of append mode and checkambig=True only in limited |
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365 cases (see also issue5418 and issue5584 for detail). |
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366 ''' |
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367 if auditpath: |
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368 if self._audit: |
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369 r = util.checkosfilename(path) |
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370 if r: |
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371 raise error.Abort("%s: %r" % (r, path)) |
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372 self.audit(path, mode=mode) |
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373 f = self.join(path) |
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374 |
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375 if "b" not in mode: |
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376 mode += "b" # for that other OS |
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377 |
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378 nlink = -1 |
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379 if mode not in ('r', 'rb'): |
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380 dirname, basename = util.split(f) |
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381 # If basename is empty, then the path is malformed because it points |
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382 # to a directory. Let the posixfile() call below raise IOError. |
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383 if basename: |
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384 if atomictemp: |
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385 util.makedirs(dirname, self.createmode, notindexed) |
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386 return util.atomictempfile(f, mode, self.createmode, |
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387 checkambig=checkambig) |
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388 try: |
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389 if 'w' in mode: |
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390 util.unlink(f) |
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391 nlink = 0 |
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392 else: |
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393 # nlinks() may behave differently for files on Windows |
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394 # shares if the file is open. |
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395 with util.posixfile(f): |
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396 nlink = util.nlinks(f) |
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397 if nlink < 1: |
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398 nlink = 2 # force mktempcopy (issue1922) |
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399 except (OSError, IOError) as e: |
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400 if e.errno != errno.ENOENT: |
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401 raise |
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402 nlink = 0 |
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403 util.makedirs(dirname, self.createmode, notindexed) |
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404 if nlink > 0: |
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405 if self._trustnlink is None: |
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406 self._trustnlink = nlink > 1 or util.checknlink(f) |
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407 if nlink > 1 or not self._trustnlink: |
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408 util.rename(util.mktempcopy(f), f) |
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409 fp = util.posixfile(f, mode) |
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410 if nlink == 0: |
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411 self._fixfilemode(f) |
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412 |
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413 if checkambig: |
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414 if mode in ('r', 'rb'): |
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415 raise error.Abort(_('implementation error: mode %s is not' |
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416 ' valid for checkambig=True') % mode) |
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417 fp = checkambigatclosing(fp) |
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418 |
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419 if (backgroundclose and |
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420 isinstance(threading.currentThread(), threading._MainThread)): |
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421 if not self._backgroundfilecloser: |
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422 raise error.Abort(_('backgroundclose can only be used when a ' |
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423 'backgroundclosing context manager is active') |
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424 ) |
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425 |
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426 fp = delayclosedfile(fp, self._backgroundfilecloser) |
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427 |
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428 return fp |
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429 |
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430 def symlink(self, src, dst): |
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431 self.audit(dst) |
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432 linkname = self.join(dst) |
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434 |
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435 util.makedirs(os.path.dirname(linkname), self.createmode) |
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436 |
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437 if self._cansymlink: |
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438 try: |
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439 os.symlink(src, linkname) |
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440 except OSError as err: |
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441 raise OSError(err.errno, _('could not symlink to %r: %s') % |
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442 (src, encoding.strtolocal(err.strerror)), |
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443 linkname) |
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444 else: |
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445 self.write(dst, src) |
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446 |
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447 def join(self, path, *insidef): |
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448 if path: |
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449 return os.path.join(self.base, path, *insidef) |
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450 else: |
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451 return self.base |
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452 |
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453 opener = vfs |
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454 |
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455 class proxyvfs(object): |
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456 def __init__(self, vfs): |
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457 self.vfs = vfs |
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458 |
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459 @property |
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460 def options(self): |
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461 return self.vfs.options |
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462 |
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463 @options.setter |
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464 def options(self, value): |
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465 self.vfs.options = value |
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466 |
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467 class filtervfs(abstractvfs, proxyvfs): |
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468 '''Wrapper vfs for filtering filenames with a function.''' |
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469 |
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470 def __init__(self, vfs, filter): |
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471 proxyvfs.__init__(self, vfs) |
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472 self._filter = filter |
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473 |
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474 def __call__(self, path, *args, **kwargs): |
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475 return self.vfs(self._filter(path), *args, **kwargs) |
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476 |
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477 def join(self, path, *insidef): |
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478 if path: |
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479 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
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480 else: |
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481 return self.vfs.join(path) |
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482 |
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483 filteropener = filtervfs |
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484 |
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485 class readonlyvfs(abstractvfs, proxyvfs): |
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486 '''Wrapper vfs preventing any writing.''' |
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487 |
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488 def __init__(self, vfs): |
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489 proxyvfs.__init__(self, vfs) |
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490 |
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491 def __call__(self, path, mode='r', *args, **kw): |
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492 if mode not in ('r', 'rb'): |
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493 raise error.Abort(_('this vfs is read only')) |
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494 return self.vfs(path, mode, *args, **kw) |
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495 |
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496 def join(self, path, *insidef): |
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497 return self.vfs.join(path, *insidef) |
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498 |
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499 class closewrapbase(object): |
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500 """Base class of wrapper, which hooks closing |
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501 |
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502 Do not instantiate outside of the vfs layer. |
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503 """ |
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504 def __init__(self, fh): |
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505 object.__setattr__(self, r'_origfh', fh) |
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506 |
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507 def __getattr__(self, attr): |
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508 return getattr(self._origfh, attr) |
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509 |
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510 def __setattr__(self, attr, value): |
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511 return setattr(self._origfh, attr, value) |
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512 |
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513 def __delattr__(self, attr): |
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514 return delattr(self._origfh, attr) |
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515 |
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516 def __enter__(self): |
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517 return self._origfh.__enter__() |
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518 |
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519 def __exit__(self, exc_type, exc_value, exc_tb): |
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520 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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521 |
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522 def close(self): |
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523 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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524 |
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525 class delayclosedfile(closewrapbase): |
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526 """Proxy for a file object whose close is delayed. |
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527 |
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528 Do not instantiate outside of the vfs layer. |
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529 """ |
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530 def __init__(self, fh, closer): |
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531 super(delayclosedfile, self).__init__(fh) |
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532 object.__setattr__(self, r'_closer', closer) |
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533 |
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534 def __exit__(self, exc_type, exc_value, exc_tb): |
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535 self._closer.close(self._origfh) |
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536 |
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537 def close(self): |
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538 self._closer.close(self._origfh) |
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539 |
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540 class backgroundfilecloser(object): |
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541 """Coordinates background closing of file handles on multiple threads.""" |
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542 def __init__(self, ui, expectedcount=-1): |
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543 self._running = False |
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544 self._entered = False |
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545 self._threads = [] |
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546 self._threadexception = None |
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547 |
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548 # Only Windows/NTFS has slow file closing. So only enable by default |
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549 # on that platform. But allow to be enabled elsewhere for testing. |
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551 enabled = ui.configbool('worker', 'backgroundclose', defaultenabled) |
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552 |
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553 if not enabled: |
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554 return |
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555 |
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556 # There is overhead to starting and stopping the background threads. |
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557 # Don't do background processing unless the file count is large enough |
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558 # to justify it. |
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559 minfilecount = ui.configint('worker', 'backgroundcloseminfilecount') |
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560 # FUTURE dynamically start background threads after minfilecount closes. |
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561 # (We don't currently have any callers that don't know their file count) |
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562 if expectedcount > 0 and expectedcount < minfilecount: |
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563 return |
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564 |
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565 maxqueue = ui.configint('worker', 'backgroundclosemaxqueue') |
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566 threadcount = ui.configint('worker', 'backgroundclosethreadcount') |
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567 |
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568 ui.debug('starting %d threads for background file closing\n' % |
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569 threadcount) |
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570 |
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571 self._queue = util.queue(maxsize=maxqueue) |
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572 self._running = True |
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573 |
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574 for i in range(threadcount): |
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575 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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576 self._threads.append(t) |
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577 t.start() |
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578 |
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579 def __enter__(self): |
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580 self._entered = True |
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581 return self |
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582 |
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583 def __exit__(self, exc_type, exc_value, exc_tb): |
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584 self._running = False |
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585 |
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586 # Wait for threads to finish closing so open files don't linger for |
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587 # longer than lifetime of context manager. |
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588 for t in self._threads: |
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589 t.join() |
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590 |
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591 def _worker(self): |
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592 """Main routine for worker thread.""" |
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593 while True: |
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594 try: |
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595 fh = self._queue.get(block=True, timeout=0.100) |
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596 # Need to catch or the thread will terminate and |
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597 # we could orphan file descriptors. |
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598 try: |
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599 fh.close() |
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600 except Exception as e: |
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601 # Stash so can re-raise from main thread later. |
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602 self._threadexception = e |
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603 except util.empty: |
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604 if not self._running: |
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605 break |
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606 |
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607 def close(self, fh): |
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608 """Schedule a file for closing.""" |
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609 if not self._entered: |
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610 raise error.Abort(_('can only call close() when context manager ' |
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611 'active')) |
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612 |
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613 # If a background thread encountered an exception, raise now so we fail |
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614 # fast. Otherwise we may potentially go on for minutes until the error |
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615 # is acted on. |
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616 if self._threadexception: |
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617 e = self._threadexception |
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618 self._threadexception = None |
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619 raise e |
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620 |
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621 # If we're not actively running, close synchronously. |
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622 if not self._running: |
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623 fh.close() |
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624 return |
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625 |
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626 self._queue.put(fh, block=True, timeout=None) |
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627 |
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628 class checkambigatclosing(closewrapbase): |
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629 """Proxy for a file object, to avoid ambiguity of file stat |
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630 |
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631 See also util.filestat for detail about "ambiguity of file stat". |
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632 |
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633 This proxy is useful only if the target file is guarded by any |
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634 lock (e.g. repo.lock or repo.wlock) |
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635 |
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636 Do not instantiate outside of the vfs layer. |
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637 """ |
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638 def __init__(self, fh): |
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639 super(checkambigatclosing, self).__init__(fh) |
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640 object.__setattr__(self, r'_oldstat', util.filestat.frompath(fh.name)) |
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641 |
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642 def _checkambig(self): |
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643 oldstat = self._oldstat |
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644 if oldstat.stat: |
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645 _avoidambig(self._origfh.name, oldstat) |
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646 |
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647 def __exit__(self, exc_type, exc_value, exc_tb): |
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648 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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649 self._checkambig() |
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650 |
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651 def close(self): |
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652 self._origfh.close() |
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653 self._checkambig() |