Mercurial > hg
annotate mercurial/vfs.py @ 40626:87a872555e90
revlog: detect incomplete revlog reads
_readsegment() is supposed to return N bytes of revlog revision
data starting at a file offset. Surprisingly, its behavior before
this patch never verified that it actually read and returned N
bytes! Instead, it would perform the read(), then return whatever
data was available. And even more surprisingly, nothing in the
call chain appears to have been validating that it received all
the data it was expecting.
This behavior could lead to partial or incomplete revision chunks
being operated on. This could result in e.g. cached deltas being
applied against incomplete base revisions. The delta application
process would happily perform this operation. Only hash
verification would detect the corruption and save us.
This commit changes the behavior of raw revlog reading to validate
that we actually read() the number of bytes that were requested.
We will raise a more specific error faster, rather than possibly
have it go undetected or manifest later in the call stack, at
delta application or hash verification.
Differential Revision: https://phab.mercurial-scm.org/D5266
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Tue, 13 Nov 2018 12:30:59 -0800 |
parents | 5fe0b880200e |
children | 34f15db81cf0 8d9f366b7f19 |
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 threading |
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15 |
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16 from .i18n import _ |
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17 from . import ( |
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18 encoding, |
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19 error, |
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20 pathutil, |
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21 pycompat, |
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22 util, |
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23 ) |
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24 |
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25 def _avoidambig(path, oldstat): |
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26 """Avoid file stat ambiguity forcibly |
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27 |
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28 This function causes copying ``path`` file, if it is owned by |
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29 another (see issue5418 and issue5584 for detail). |
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30 """ |
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31 def checkandavoid(): |
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32 newstat = util.filestat.frompath(path) |
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33 # return whether file stat ambiguity is (already) avoided |
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34 return (not newstat.isambig(oldstat) or |
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35 newstat.avoidambig(path, oldstat)) |
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36 if not checkandavoid(): |
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37 # simply copy to change owner of path to get privilege to |
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38 # advance mtime (see issue5418) |
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39 util.rename(util.mktempcopy(path), path) |
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40 checkandavoid() |
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41 |
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42 class abstractvfs(object): |
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43 """Abstract base class; cannot be instantiated""" |
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44 |
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45 def __init__(self, *args, **kwargs): |
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46 '''Prevent instantiation; don't call this from subclasses.''' |
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47 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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48 |
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49 def tryread(self, path): |
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50 '''gracefully return an empty string for missing files''' |
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51 try: |
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52 return self.read(path) |
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53 except IOError as inst: |
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54 if inst.errno != errno.ENOENT: |
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55 raise |
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56 return "" |
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57 |
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58 def tryreadlines(self, path, mode='rb'): |
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59 '''gracefully return an empty array for missing files''' |
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60 try: |
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61 return self.readlines(path, mode=mode) |
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62 except IOError as inst: |
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63 if inst.errno != errno.ENOENT: |
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64 raise |
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65 return [] |
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66 |
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67 @util.propertycache |
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68 def open(self): |
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69 '''Open ``path`` file, which is relative to vfs root. |
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70 |
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71 Newly created directories are marked as "not to be indexed by |
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72 the content indexing service", if ``notindexed`` is specified |
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73 for "write" mode access. |
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74 ''' |
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75 return self.__call__ |
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76 |
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77 def read(self, path): |
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78 with self(path, 'rb') as fp: |
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79 return fp.read() |
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80 |
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81 def readlines(self, path, mode='rb'): |
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82 with self(path, mode=mode) as fp: |
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83 return fp.readlines() |
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84 |
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85 def write(self, path, data, backgroundclose=False, **kwargs): |
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86 with self(path, 'wb', backgroundclose=backgroundclose, **kwargs) as fp: |
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87 return fp.write(data) |
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88 |
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89 def writelines(self, path, data, mode='wb', notindexed=False): |
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90 with self(path, mode=mode, notindexed=notindexed) as fp: |
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91 return fp.writelines(data) |
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92 |
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93 def append(self, path, data): |
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94 with self(path, 'ab') as fp: |
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95 return fp.write(data) |
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96 |
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97 def basename(self, path): |
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98 """return base element of a path (as os.path.basename would do) |
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99 |
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100 This exists to allow handling of strange encoding if needed.""" |
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101 return os.path.basename(path) |
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102 |
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103 def chmod(self, path, mode): |
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104 return os.chmod(self.join(path), mode) |
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105 |
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106 def dirname(self, path): |
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107 """return dirname element of a path (as os.path.dirname would do) |
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108 |
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109 This exists to allow handling of strange encoding if needed.""" |
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110 return os.path.dirname(path) |
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111 |
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112 def exists(self, path=None): |
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113 return os.path.exists(self.join(path)) |
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114 |
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115 def fstat(self, fp): |
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116 return util.fstat(fp) |
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117 |
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118 def isdir(self, path=None): |
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119 return os.path.isdir(self.join(path)) |
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120 |
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121 def isfile(self, path=None): |
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122 return os.path.isfile(self.join(path)) |
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123 |
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124 def islink(self, path=None): |
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125 return os.path.islink(self.join(path)) |
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126 |
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127 def isfileorlink(self, path=None): |
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128 '''return whether path is a regular file or a symlink |
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129 |
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130 Unlike isfile, this doesn't follow symlinks.''' |
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131 try: |
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132 st = self.lstat(path) |
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133 except OSError: |
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134 return False |
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135 mode = st.st_mode |
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136 return stat.S_ISREG(mode) or stat.S_ISLNK(mode) |
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137 |
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138 def reljoin(self, *paths): |
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139 """join various elements of a path together (as os.path.join would do) |
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140 |
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141 The vfs base is not injected so that path stay relative. This exists |
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142 to allow handling of strange encoding if needed.""" |
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143 return os.path.join(*paths) |
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144 |
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145 def split(self, path): |
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146 """split top-most element of a path (as os.path.split would do) |
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147 |
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148 This exists to allow handling of strange encoding if needed.""" |
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149 return os.path.split(path) |
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150 |
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151 def lexists(self, path=None): |
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152 return os.path.lexists(self.join(path)) |
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153 |
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154 def lstat(self, path=None): |
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155 return os.lstat(self.join(path)) |
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156 |
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157 def listdir(self, path=None): |
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158 return os.listdir(self.join(path)) |
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159 |
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160 def makedir(self, path=None, notindexed=True): |
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161 return util.makedir(self.join(path), notindexed) |
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162 |
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163 def makedirs(self, path=None, mode=None): |
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164 return util.makedirs(self.join(path), mode) |
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165 |
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166 def makelock(self, info, path): |
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167 return util.makelock(info, self.join(path)) |
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168 |
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169 def mkdir(self, path=None): |
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170 return os.mkdir(self.join(path)) |
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171 |
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172 def mkstemp(self, suffix='', prefix='tmp', dir=None): |
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173 fd, name = pycompat.mkstemp(suffix=suffix, prefix=prefix, |
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174 dir=self.join(dir)) |
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175 dname, fname = util.split(name) |
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176 if dir: |
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177 return fd, os.path.join(dir, fname) |
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178 else: |
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179 return fd, fname |
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180 |
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181 def readdir(self, path=None, stat=None, skip=None): |
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182 return util.listdir(self.join(path), stat, skip) |
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183 |
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184 def readlock(self, path): |
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185 return util.readlock(self.join(path)) |
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186 |
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187 def rename(self, src, dst, checkambig=False): |
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188 """Rename from src to dst |
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189 |
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190 checkambig argument is used with util.filestat, and is useful |
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191 only if destination file is guarded by any lock |
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192 (e.g. repo.lock or repo.wlock). |
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193 |
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194 To avoid file stat ambiguity forcibly, checkambig=True involves |
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195 copying ``src`` file, if it is owned by another. Therefore, use |
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196 checkambig=True only in limited cases (see also issue5418 and |
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197 issue5584 for detail). |
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198 """ |
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199 srcpath = self.join(src) |
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200 dstpath = self.join(dst) |
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201 oldstat = checkambig and util.filestat.frompath(dstpath) |
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202 if oldstat and oldstat.stat: |
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203 ret = util.rename(srcpath, dstpath) |
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204 _avoidambig(dstpath, oldstat) |
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205 return ret |
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206 return util.rename(srcpath, dstpath) |
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207 |
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208 def readlink(self, path): |
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209 return util.readlink(self.join(path)) |
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210 |
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211 def removedirs(self, path=None): |
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212 """Remove a leaf directory and all empty intermediate ones |
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213 """ |
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214 return util.removedirs(self.join(path)) |
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215 |
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216 def rmdir(self, path=None): |
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217 """Remove an empty directory.""" |
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218 return os.rmdir(self.join(path)) |
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219 |
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220 def rmtree(self, path=None, ignore_errors=False, forcibly=False): |
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221 """Remove a directory tree recursively |
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222 |
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223 If ``forcibly``, this tries to remove READ-ONLY files, too. |
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224 """ |
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225 if forcibly: |
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226 def onerror(function, path, excinfo): |
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227 if function is not os.remove: |
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228 raise |
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229 # read-only files cannot be unlinked under Windows |
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230 s = os.stat(path) |
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231 if (s.st_mode & stat.S_IWRITE) != 0: |
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232 raise |
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233 os.chmod(path, stat.S_IMODE(s.st_mode) | stat.S_IWRITE) |
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234 os.remove(path) |
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235 else: |
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236 onerror = None |
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237 return shutil.rmtree(self.join(path), |
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238 ignore_errors=ignore_errors, onerror=onerror) |
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239 |
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240 def setflags(self, path, l, x): |
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241 return util.setflags(self.join(path), l, x) |
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242 |
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243 def stat(self, path=None): |
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244 return os.stat(self.join(path)) |
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245 |
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246 def unlink(self, path=None): |
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247 return util.unlink(self.join(path)) |
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248 |
31542 | 249 def tryunlink(self, path=None): |
250 """Attempt to remove a file, ignoring missing file errors.""" | |
251 util.tryunlink(self.join(path)) | |
252 | |
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253 def unlinkpath(self, path=None, ignoremissing=False, rmdir=True): |
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254 return util.unlinkpath(self.join(path), ignoremissing=ignoremissing, |
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255 rmdir=rmdir) |
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256 |
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257 def utime(self, path=None, t=None): |
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258 return os.utime(self.join(path), t) |
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259 |
24725 | 260 def walk(self, path=None, onerror=None): |
261 """Yield (dirpath, dirs, files) tuple for each directories under path | |
262 | |
263 ``dirpath`` is relative one from the root of this vfs. This | |
264 uses ``os.sep`` as path separator, even you specify POSIX | |
265 style ``path``. | |
266 | |
267 "The root of this vfs" is represented as empty ``dirpath``. | |
268 """ | |
269 root = os.path.normpath(self.join(None)) | |
270 # when dirpath == root, dirpath[prefixlen:] becomes empty | |
271 # because len(dirpath) < prefixlen. | |
272 prefixlen = len(pathutil.normasprefix(root)) | |
273 for dirpath, dirs, files in os.walk(self.join(path), onerror=onerror): | |
274 yield (dirpath[prefixlen:], dirs, files) | |
275 | |
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276 @contextlib.contextmanager |
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277 def backgroundclosing(self, ui, expectedcount=-1): |
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278 """Allow files to be closed asynchronously. |
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279 |
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280 When this context manager is active, ``backgroundclose`` can be passed |
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281 to ``__call__``/``open`` to result in the file possibly being closed |
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282 asynchronously, on a background thread. |
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283 """ |
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284 # Sharing backgroundfilecloser between threads is complex and using |
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285 # multiple instances puts us at risk of running out of file descriptors |
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286 # only allow to use backgroundfilecloser when in main thread. |
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287 if not isinstance(threading.currentThread(), threading._MainThread): |
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288 yield |
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289 return |
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290 vfs = getattr(self, 'vfs', self) |
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291 if getattr(vfs, '_backgroundfilecloser', None): |
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292 raise error.Abort( |
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293 _('can only have 1 active background file closer')) |
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294 |
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295 with backgroundfilecloser(ui, expectedcount=expectedcount) as bfc: |
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296 try: |
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297 vfs._backgroundfilecloser = bfc |
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298 yield bfc |
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299 finally: |
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300 vfs._backgroundfilecloser = None |
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301 |
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302 class vfs(abstractvfs): |
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303 '''Operate files relative to a base directory |
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304 |
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305 This class is used to hide the details of COW semantics and |
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306 remote file access from higher level code. |
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307 |
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308 'cacheaudited' should be enabled only if (a) vfs object is short-lived, or |
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309 (b) the base directory is managed by hg and considered sort-of append-only. |
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310 See pathutil.pathauditor() for details. |
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311 ''' |
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312 def __init__(self, base, audit=True, cacheaudited=False, expandpath=False, |
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313 realpath=False): |
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314 if expandpath: |
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315 base = util.expandpath(base) |
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316 if realpath: |
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317 base = os.path.realpath(base) |
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318 self.base = base |
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319 self._audit = audit |
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320 if audit: |
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321 self.audit = pathutil.pathauditor(self.base, cached=cacheaudited) |
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322 else: |
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323 self.audit = (lambda path, mode=None: True) |
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324 self.createmode = None |
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325 self._trustnlink = None |
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326 |
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327 @util.propertycache |
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328 def _cansymlink(self): |
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329 return util.checklink(self.base) |
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330 |
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331 @util.propertycache |
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332 def _chmod(self): |
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333 return util.checkexec(self.base) |
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334 |
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335 def _fixfilemode(self, name): |
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336 if self.createmode is None or not self._chmod: |
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337 return |
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338 os.chmod(name, self.createmode & 0o666) |
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339 |
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340 def __call__(self, path, mode="r", atomictemp=False, notindexed=False, |
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341 backgroundclose=False, checkambig=False, auditpath=True): |
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342 '''Open ``path`` file, which is relative to vfs root. |
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343 |
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344 Newly created directories are marked as "not to be indexed by |
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345 the content indexing service", if ``notindexed`` is specified |
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346 for "write" mode access. |
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347 |
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348 If ``backgroundclose`` is passed, the file may be closed asynchronously. |
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349 It can only be used if the ``self.backgroundclosing()`` context manager |
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350 is active. This should only be specified if the following criteria hold: |
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351 |
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352 1. There is a potential for writing thousands of files. Unless you |
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353 are writing thousands of files, the performance benefits of |
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354 asynchronously closing files is not realized. |
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355 2. Files are opened exactly once for the ``backgroundclosing`` |
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356 active duration and are therefore free of race conditions between |
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357 closing a file on a background thread and reopening it. (If the |
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358 file were opened multiple times, there could be unflushed data |
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359 because the original file handle hasn't been flushed/closed yet.) |
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360 |
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361 ``checkambig`` argument is passed to atomictemplfile (valid |
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362 only for writing), and is useful only if target file is |
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363 guarded by any lock (e.g. repo.lock or repo.wlock). |
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364 |
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365 To avoid file stat ambiguity forcibly, checkambig=True involves |
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366 copying ``path`` file opened in "append" mode (e.g. for |
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367 truncation), if it is owned by another. Therefore, use |
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368 combination of append mode and checkambig=True only in limited |
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369 cases (see also issue5418 and issue5584 for detail). |
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370 ''' |
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371 if auditpath: |
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372 if self._audit: |
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373 r = util.checkosfilename(path) |
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374 if r: |
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375 raise error.Abort("%s: %r" % (r, path)) |
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376 self.audit(path, mode=mode) |
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377 f = self.join(path) |
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378 |
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379 if "b" not in mode: |
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380 mode += "b" # for that other OS |
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381 |
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382 nlink = -1 |
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383 if mode not in ('r', 'rb'): |
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384 dirname, basename = util.split(f) |
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385 # If basename is empty, then the path is malformed because it points |
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386 # to a directory. Let the posixfile() call below raise IOError. |
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387 if basename: |
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388 if atomictemp: |
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389 util.makedirs(dirname, self.createmode, notindexed) |
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390 return util.atomictempfile(f, mode, self.createmode, |
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391 checkambig=checkambig) |
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392 try: |
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393 if 'w' in mode: |
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394 util.unlink(f) |
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395 nlink = 0 |
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396 else: |
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397 # nlinks() may behave differently for files on Windows |
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398 # shares if the file is open. |
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399 with util.posixfile(f): |
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400 nlink = util.nlinks(f) |
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401 if nlink < 1: |
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402 nlink = 2 # force mktempcopy (issue1922) |
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403 except (OSError, IOError) as e: |
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404 if e.errno != errno.ENOENT: |
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405 raise |
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406 nlink = 0 |
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407 util.makedirs(dirname, self.createmode, notindexed) |
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408 if nlink > 0: |
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409 if self._trustnlink is None: |
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410 self._trustnlink = nlink > 1 or util.checknlink(f) |
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411 if nlink > 1 or not self._trustnlink: |
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412 util.rename(util.mktempcopy(f), f) |
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413 fp = util.posixfile(f, mode) |
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414 if nlink == 0: |
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415 self._fixfilemode(f) |
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416 |
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417 if checkambig: |
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418 if mode in ('r', 'rb'): |
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419 raise error.Abort(_('implementation error: mode %s is not' |
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420 ' valid for checkambig=True') % mode) |
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421 fp = checkambigatclosing(fp) |
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422 |
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423 if (backgroundclose and |
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424 isinstance(threading.currentThread(), threading._MainThread)): |
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425 if not self._backgroundfilecloser: |
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426 raise error.Abort(_('backgroundclose can only be used when a ' |
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427 'backgroundclosing context manager is active') |
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428 ) |
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429 |
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430 fp = delayclosedfile(fp, self._backgroundfilecloser) |
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431 |
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432 return fp |
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433 |
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434 def symlink(self, src, dst): |
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435 self.audit(dst) |
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436 linkname = self.join(dst) |
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438 |
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439 util.makedirs(os.path.dirname(linkname), self.createmode) |
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parents:
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|
440 |
14261
e3649bcca3f6
opener: rename _can_symlink to _cansymlink
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parents:
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|
441 if self._cansymlink: |
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|
442 try: |
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diff
changeset
|
443 os.symlink(src, linkname) |
25660
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global: mass rewrite to use modern exception syntax
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parents:
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|
444 except OSError as err: |
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|
445 raise OSError(err.errno, _('could not symlink to %r: %s') % |
34022
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python3: wrap all uses of <exception>.strerror with strtolocal
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parents:
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446 (src, encoding.strtolocal(err.strerror)), |
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|
447 linkname) |
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parents:
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|
448 else: |
17768
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parents:
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|
449 self.write(dst, src) |
13971
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move canonpath from util to scmutil
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parents:
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changeset
|
450 |
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451 def join(self, path, *insidef): |
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|
452 if path: |
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|
453 return os.path.join(self.base, path, *insidef) |
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parents:
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|
454 else: |
a41fd730f230
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parents:
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|
455 return self.base |
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scmutil: add join method to opener to construct path relative to base
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parents:
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|
456 |
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|
457 opener = vfs |
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|
458 |
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|
459 class proxyvfs(object): |
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460 def __init__(self, vfs): |
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461 self.vfs = vfs |
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462 |
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cleanup: use modern @property/@foo.setter property specification
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parents:
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|
463 @property |
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464 def options(self): |
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|
465 return self.vfs.options |
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|
466 |
69109052d9ac
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|
467 @options.setter |
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468 def options(self, value): |
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|
469 self.vfs.options = value |
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|
470 |
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|
471 class filtervfs(abstractvfs, proxyvfs): |
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|
472 '''Wrapper vfs for filtering filenames with a function.''' |
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diff
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|
473 |
17846
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scmutil: add mustaudit delegation to filtervfs (issue3673)
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|
474 def __init__(self, vfs, filter): |
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|
475 proxyvfs.__init__(self, vfs) |
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476 self._filter = filter |
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|
477 |
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diff
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|
478 def __call__(self, path, *args, **kwargs): |
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|
479 return self.vfs(self._filter(path), *args, **kwargs) |
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diff
changeset
|
480 |
24628
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parents:
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|
481 def join(self, path, *insidef): |
17725
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diff
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|
482 if path: |
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|
483 return self.vfs.join(self._filter(self.vfs.reljoin(path, *insidef))) |
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vfs: define "join()" in each classes derived from "abstractvfs"
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|
484 else: |
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parents:
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diff
changeset
|
485 return self.vfs.join(path) |
17725
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vfs: define "join()" in each classes derived from "abstractvfs"
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diff
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|
486 |
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|
487 filteropener = filtervfs |
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|
488 |
33412
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|
489 class readonlyvfs(abstractvfs, proxyvfs): |
18213
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|
490 '''Wrapper vfs preventing any writing.''' |
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diff
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|
491 |
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|
492 def __init__(self, vfs): |
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493 proxyvfs.__init__(self, vfs) |
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diff
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|
494 |
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diff
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|
495 def __call__(self, path, mode='r', *args, **kw): |
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|
496 if mode not in ('r', 'rb'): |
29389
98e8313dcd9e
i18n: translate abort messages
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|
497 raise error.Abort(_('this vfs is read only')) |
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498 return self.vfs(path, mode, *args, **kw) |
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diff
changeset
|
499 |
26156
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scmutil.readonlyvfs: implement join
Siddharth Agarwal <sid0@fb.com>
parents:
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diff
changeset
|
500 def join(self, path, *insidef): |
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parents:
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diff
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|
501 return self.vfs.join(path, *insidef) |
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|
502 |
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|
503 class closewrapbase(object): |
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|
504 """Base class of wrapper, which hooks closing |
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|
505 |
2d6a89e79b48
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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): |
31644
f80d9ddc40f3
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|
509 object.__setattr__(self, r'_origfh', fh) |
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|
510 |
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|
511 def __getattr__(self, attr): |
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512 return getattr(self._origfh, attr) |
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513 |
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|
514 def __setattr__(self, attr, value): |
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515 return setattr(self._origfh, attr, value) |
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|
516 |
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517 def __delattr__(self, attr): |
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|
518 return delattr(self._origfh, attr) |
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519 |
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520 def __enter__(self): |
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|
521 return self._origfh.__enter__() |
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|
522 |
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523 def __exit__(self, exc_type, exc_value, exc_tb): |
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524 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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525 |
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526 def close(self): |
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527 raise NotImplementedError('attempted instantiating ' + str(type(self))) |
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528 |
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529 class delayclosedfile(closewrapbase): |
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530 """Proxy for a file object whose close is delayed. |
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531 |
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|
532 Do not instantiate outside of the vfs layer. |
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533 """ |
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534 def __init__(self, fh, closer): |
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535 super(delayclosedfile, self).__init__(fh) |
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536 object.__setattr__(self, r'_closer', closer) |
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537 |
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538 def __exit__(self, exc_type, exc_value, exc_tb): |
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539 self._closer.close(self._origfh) |
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540 |
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541 def close(self): |
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542 self._closer.close(self._origfh) |
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543 |
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|
544 class backgroundfilecloser(object): |
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545 """Coordinates background closing of file handles on multiple threads.""" |
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546 def __init__(self, ui, expectedcount=-1): |
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547 self._running = False |
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548 self._entered = False |
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|
549 self._threads = [] |
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550 self._threadexception = None |
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551 |
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552 # Only Windows/NTFS has slow file closing. So only enable by default |
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553 # on that platform. But allow to be enabled elsewhere for testing. |
34645 | 554 defaultenabled = pycompat.iswindows |
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555 enabled = ui.configbool('worker', 'backgroundclose', defaultenabled) |
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556 |
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557 if not enabled: |
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558 return |
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559 |
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560 # There is overhead to starting and stopping the background threads. |
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561 # Don't do background processing unless the file count is large enough |
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562 # to justify it. |
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563 minfilecount = ui.configint('worker', 'backgroundcloseminfilecount') |
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564 # FUTURE dynamically start background threads after minfilecount closes. |
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565 # (We don't currently have any callers that don't know their file count) |
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566 if expectedcount > 0 and expectedcount < minfilecount: |
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567 return |
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568 |
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569 maxqueue = ui.configint('worker', 'backgroundclosemaxqueue') |
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570 threadcount = ui.configint('worker', 'backgroundclosethreadcount') |
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571 |
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572 ui.debug('starting %d threads for background file closing\n' % |
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573 threadcount) |
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574 |
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575 self._queue = pycompat.queue.Queue(maxsize=maxqueue) |
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576 self._running = True |
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577 |
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578 for i in range(threadcount): |
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579 t = threading.Thread(target=self._worker, name='backgroundcloser') |
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580 self._threads.append(t) |
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581 t.start() |
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582 |
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583 def __enter__(self): |
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584 self._entered = True |
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585 return self |
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586 |
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587 def __exit__(self, exc_type, exc_value, exc_tb): |
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588 self._running = False |
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589 |
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590 # Wait for threads to finish closing so open files don't linger for |
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591 # longer than lifetime of context manager. |
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592 for t in self._threads: |
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593 t.join() |
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594 |
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595 def _worker(self): |
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596 """Main routine for worker thread.""" |
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597 while True: |
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598 try: |
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599 fh = self._queue.get(block=True, timeout=0.100) |
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600 # Need to catch or the thread will terminate and |
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601 # we could orphan file descriptors. |
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602 try: |
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603 fh.close() |
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604 except Exception as e: |
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605 # Stash so can re-raise from main thread later. |
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606 self._threadexception = e |
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607 except pycompat.queue.Empty: |
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608 if not self._running: |
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609 break |
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610 |
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611 def close(self, fh): |
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612 """Schedule a file for closing.""" |
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613 if not self._entered: |
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614 raise error.Abort(_('can only call close() when context manager ' |
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615 'active')) |
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616 |
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617 # If a background thread encountered an exception, raise now so we fail |
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618 # fast. Otherwise we may potentially go on for minutes until the error |
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619 # is acted on. |
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620 if self._threadexception: |
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621 e = self._threadexception |
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622 self._threadexception = None |
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623 raise e |
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624 |
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625 # If we're not actively running, close synchronously. |
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626 if not self._running: |
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627 fh.close() |
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628 return |
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629 |
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630 self._queue.put(fh, block=True, timeout=None) |
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631 |
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632 class checkambigatclosing(closewrapbase): |
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633 """Proxy for a file object, to avoid ambiguity of file stat |
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634 |
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635 See also util.filestat for detail about "ambiguity of file stat". |
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636 |
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637 This proxy is useful only if the target file is guarded by any |
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638 lock (e.g. repo.lock or repo.wlock) |
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639 |
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640 Do not instantiate outside of the vfs layer. |
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641 """ |
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642 def __init__(self, fh): |
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643 super(checkambigatclosing, self).__init__(fh) |
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644 object.__setattr__(self, r'_oldstat', util.filestat.frompath(fh.name)) |
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645 |
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646 def _checkambig(self): |
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647 oldstat = self._oldstat |
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648 if oldstat.stat: |
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649 _avoidambig(self._origfh.name, oldstat) |
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650 |
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651 def __exit__(self, exc_type, exc_value, exc_tb): |
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652 self._origfh.__exit__(exc_type, exc_value, exc_tb) |
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653 self._checkambig() |
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654 |
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655 def close(self): |
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656 self._origfh.close() |
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657 self._checkambig() |