Mercurial > hg
annotate mercurial/pathutil.py @ 48946:642e31cb55f0
py3: use class X: instead of class X(object):
The inheritance from object is implied in Python 3. So this should
be equivalent.
This change was generated via an automated search and replace. So there
may have been some accidental changes.
Differential Revision: https://phab.mercurial-scm.org/D12352
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 21 Feb 2022 13:08:28 -0700 |
parents | f254fc73d956 |
children | 44deb5a164dc |
rev | line source |
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1 import contextlib |
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2 import errno |
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3 import os |
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4 import posixpath |
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5 import stat |
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6 |
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7 from .i18n import _ |
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8 from . import ( |
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9 encoding, |
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10 error, |
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11 policy, |
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12 pycompat, |
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13 util, |
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14 ) |
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15 |
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16 if pycompat.TYPE_CHECKING: |
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17 from typing import ( |
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18 Any, |
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19 Callable, |
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20 Iterator, |
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21 Optional, |
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22 ) |
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23 |
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24 |
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25 rustdirs = policy.importrust('dirstate', 'Dirs') |
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26 parsers = policy.importmod('parsers') |
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27 |
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28 |
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29 def _lowerclean(s): |
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30 # type: (bytes) -> bytes |
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31 return encoding.hfsignoreclean(s.lower()) |
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32 |
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33 |
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34 class pathauditor: |
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35 """ensure that a filesystem path contains no banned components. |
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36 the following properties of a path are checked: |
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37 |
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38 - ends with a directory separator |
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39 - under top-level .hg |
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40 - starts at the root of a windows drive |
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41 - contains ".." |
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42 |
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43 More check are also done about the file system states: |
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44 - traverses a symlink (e.g. a/symlink_here/b) |
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45 - inside a nested repository (a callback can be used to approve |
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46 some nested repositories, e.g., subrepositories) |
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47 |
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48 The file system checks are only done when 'realfs' is set to True (the |
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49 default). They should be disable then we are auditing path for operation on |
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50 stored history. |
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51 |
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52 If 'cached' is set to True, audited paths and sub-directories are cached. |
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53 Be careful to not keep the cache of unmanaged directories for long because |
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54 audited paths may be replaced with symlinks. |
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55 """ |
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56 |
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57 def __init__(self, root, callback=None, realfs=True, cached=False): |
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58 self.audited = set() |
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59 self.auditeddir = set() |
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60 self.root = root |
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61 self._realfs = realfs |
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62 self._cached = cached |
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63 self.callback = callback |
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64 if os.path.lexists(root) and not util.fscasesensitive(root): |
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65 self.normcase = util.normcase |
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66 else: |
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67 self.normcase = lambda x: x |
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68 |
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69 def __call__(self, path, mode=None): |
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70 # type: (bytes, Optional[Any]) -> None |
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71 """Check the relative path. |
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72 path may contain a pattern (e.g. foodir/**.txt)""" |
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73 |
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74 path = util.localpath(path) |
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75 normpath = self.normcase(path) |
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76 if normpath in self.audited: |
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77 return |
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78 # AIX ignores "/" at end of path, others raise EISDIR. |
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79 if util.endswithsep(path): |
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80 raise error.InputError( |
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81 _(b"path ends in directory separator: %s") % path |
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82 ) |
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83 parts = util.splitpath(path) |
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84 if ( |
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85 os.path.splitdrive(path)[0] |
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86 or _lowerclean(parts[0]) in (b'.hg', b'.hg.', b'') |
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87 or pycompat.ospardir in parts |
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88 ): |
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89 raise error.InputError( |
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90 _(b"path contains illegal component: %s") % path |
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91 ) |
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92 # Windows shortname aliases |
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93 for p in parts: |
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94 if b"~" in p: |
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95 first, last = p.split(b"~", 1) |
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96 if last.isdigit() and first.upper() in [b"HG", b"HG8B6C"]: |
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97 raise error.InputError( |
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98 _(b"path contains illegal component: %s") % path |
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99 ) |
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100 if b'.hg' in _lowerclean(path): |
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101 lparts = [_lowerclean(p) for p in parts] |
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102 for p in b'.hg', b'.hg.': |
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103 if p in lparts[1:]: |
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104 pos = lparts.index(p) |
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105 base = os.path.join(*parts[:pos]) |
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106 raise error.InputError( |
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107 _(b"path '%s' is inside nested repo %r") |
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108 % (path, pycompat.bytestr(base)) |
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109 ) |
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110 |
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111 normparts = util.splitpath(normpath) |
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112 assert len(parts) == len(normparts) |
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113 |
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114 parts.pop() |
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115 normparts.pop() |
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116 # It's important that we check the path parts starting from the root. |
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117 # We don't want to add "foo/bar/baz" to auditeddir before checking if |
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118 # there's a "foo/.hg" directory. This also means we won't accidentally |
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119 # traverse a symlink into some other filesystem (which is potentially |
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120 # expensive to access). |
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121 for i in range(len(parts)): |
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122 prefix = pycompat.ossep.join(parts[: i + 1]) |
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123 normprefix = pycompat.ossep.join(normparts[: i + 1]) |
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124 if normprefix in self.auditeddir: |
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125 continue |
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126 if self._realfs: |
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127 self._checkfs(prefix, path) |
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128 if self._cached: |
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129 self.auditeddir.add(normprefix) |
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130 |
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131 if self._cached: |
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132 self.audited.add(normpath) |
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133 |
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134 def _checkfs(self, prefix, path): |
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135 # type: (bytes, bytes) -> None |
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136 """raise exception if a file system backed check fails""" |
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137 curpath = os.path.join(self.root, prefix) |
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138 try: |
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139 st = os.lstat(curpath) |
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140 except OSError as err: |
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141 # EINVAL can be raised as invalid path syntax under win32. |
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142 # They must be ignored for patterns can be checked too. |
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143 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): |
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144 raise |
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145 else: |
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146 if stat.S_ISLNK(st.st_mode): |
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147 msg = _(b'path %r traverses symbolic link %r') % ( |
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148 pycompat.bytestr(path), |
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149 pycompat.bytestr(prefix), |
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150 ) |
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151 raise error.Abort(msg) |
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152 elif stat.S_ISDIR(st.st_mode) and os.path.isdir( |
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153 os.path.join(curpath, b'.hg') |
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154 ): |
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155 if not self.callback or not self.callback(curpath): |
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156 msg = _(b"path '%s' is inside nested repo %r") |
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157 raise error.Abort(msg % (path, pycompat.bytestr(prefix))) |
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158 |
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159 def check(self, path): |
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160 # type: (bytes) -> bool |
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161 try: |
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162 self(path) |
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163 return True |
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164 except (OSError, error.Abort): |
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165 return False |
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166 |
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167 @contextlib.contextmanager |
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168 def cached(self): |
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169 if self._cached: |
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170 yield |
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171 else: |
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172 try: |
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173 self._cached = True |
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174 yield |
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175 finally: |
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176 self.audited.clear() |
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177 self.auditeddir.clear() |
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178 self._cached = False |
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179 |
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180 |
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181 def canonpath(root, cwd, myname, auditor=None): |
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182 # type: (bytes, bytes, bytes, Optional[pathauditor]) -> bytes |
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183 """return the canonical path of myname, given cwd and root |
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184 |
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185 >>> def check(root, cwd, myname): |
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186 ... a = pathauditor(root, realfs=False) |
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187 ... try: |
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188 ... return canonpath(root, cwd, myname, a) |
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189 ... except error.Abort: |
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190 ... return 'aborted' |
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191 >>> def unixonly(root, cwd, myname, expected='aborted'): |
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192 ... if pycompat.iswindows: |
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193 ... return expected |
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194 ... return check(root, cwd, myname) |
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195 >>> def winonly(root, cwd, myname, expected='aborted'): |
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196 ... if not pycompat.iswindows: |
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197 ... return expected |
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198 ... return check(root, cwd, myname) |
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199 >>> winonly(b'd:\\\\repo', b'c:\\\\dir', b'filename') |
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200 'aborted' |
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201 >>> winonly(b'c:\\\\repo', b'c:\\\\dir', b'filename') |
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202 'aborted' |
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203 >>> winonly(b'c:\\\\repo', b'c:\\\\', b'filename') |
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204 'aborted' |
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205 >>> winonly(b'c:\\\\repo', b'c:\\\\', b'repo\\\\filename', |
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206 ... b'filename') |
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207 'filename' |
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208 >>> winonly(b'c:\\\\repo', b'c:\\\\repo', b'filename', b'filename') |
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209 'filename' |
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210 >>> winonly(b'c:\\\\repo', b'c:\\\\repo\\\\subdir', b'filename', |
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211 ... b'subdir/filename') |
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212 'subdir/filename' |
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213 >>> unixonly(b'/repo', b'/dir', b'filename') |
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214 'aborted' |
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215 >>> unixonly(b'/repo', b'/', b'filename') |
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216 'aborted' |
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217 >>> unixonly(b'/repo', b'/', b'repo/filename', b'filename') |
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218 'filename' |
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219 >>> unixonly(b'/repo', b'/repo', b'filename', b'filename') |
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220 'filename' |
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221 >>> unixonly(b'/repo', b'/repo/subdir', b'filename', b'subdir/filename') |
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222 'subdir/filename' |
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223 """ |
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224 if util.endswithsep(root): |
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225 rootsep = root |
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226 else: |
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227 rootsep = root + pycompat.ossep |
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228 name = myname |
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229 if not os.path.isabs(name): |
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230 name = os.path.join(root, cwd, name) |
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231 name = os.path.normpath(name) |
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232 if auditor is None: |
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233 auditor = pathauditor(root) |
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234 if name != rootsep and name.startswith(rootsep): |
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235 name = name[len(rootsep) :] |
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236 auditor(name) |
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237 return util.pconvert(name) |
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238 elif name == root: |
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239 return b'' |
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240 else: |
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241 # Determine whether `name' is in the hierarchy at or beneath `root', |
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242 # by iterating name=dirname(name) until that causes no change (can't |
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243 # check name == '/', because that doesn't work on windows). The list |
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244 # `rel' holds the reversed list of components making up the relative |
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245 # file name we want. |
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246 rel = [] |
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247 while True: |
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248 try: |
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249 s = util.samefile(name, root) |
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250 except OSError: |
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251 s = False |
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252 if s: |
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253 if not rel: |
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254 # name was actually the same as root (maybe a symlink) |
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255 return b'' |
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256 rel.reverse() |
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257 name = os.path.join(*rel) |
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258 auditor(name) |
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259 return util.pconvert(name) |
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260 dirname, basename = util.split(name) |
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261 rel.append(basename) |
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262 if dirname == name: |
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263 break |
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264 name = dirname |
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265 |
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266 # A common mistake is to use -R, but specify a file relative to the repo |
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267 # instead of cwd. Detect that case, and provide a hint to the user. |
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268 hint = None |
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269 try: |
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270 if cwd != root: |
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271 canonpath(root, root, myname, auditor) |
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272 relpath = util.pathto(root, cwd, b'') |
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273 if relpath.endswith(pycompat.ossep): |
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274 relpath = relpath[:-1] |
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275 hint = _(b"consider using '--cwd %s'") % relpath |
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276 except error.Abort: |
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277 pass |
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278 |
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279 raise error.Abort( |
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280 _(b"%s not under root '%s'") % (myname, root), hint=hint |
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281 ) |
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282 |
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283 |
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284 def normasprefix(path): |
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285 # type: (bytes) -> bytes |
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286 """normalize the specified path as path prefix |
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287 |
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288 Returned value can be used safely for "p.startswith(prefix)", |
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289 "p[len(prefix):]", and so on. |
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290 |
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291 For efficiency, this expects "path" argument to be already |
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292 normalized by "os.path.normpath", "os.path.realpath", and so on. |
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293 |
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294 See also issue3033 for detail about need of this function. |
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295 |
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296 >>> normasprefix(b'/foo/bar').replace(pycompat.ossep, b'/') |
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297 '/foo/bar/' |
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298 >>> normasprefix(b'/').replace(pycompat.ossep, b'/') |
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299 '/' |
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300 """ |
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301 d, p = os.path.splitdrive(path) |
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302 if len(p) != len(pycompat.ossep): |
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303 return path + pycompat.ossep |
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304 else: |
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305 return path |
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306 |
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307 |
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308 def finddirs(path): |
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309 # type: (bytes) -> Iterator[bytes] |
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310 pos = path.rfind(b'/') |
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311 while pos != -1: |
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312 yield path[:pos] |
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313 pos = path.rfind(b'/', 0, pos) |
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314 yield b'' |
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315 |
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316 |
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317 class dirs: |
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318 '''a multiset of directory names from a set of file paths''' |
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319 |
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320 def __init__(self, map, only_tracked=False): |
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321 """ |
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322 a dict map indicates a dirstate while a list indicates a manifest |
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323 """ |
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324 self._dirs = {} |
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325 addpath = self.addpath |
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326 if isinstance(map, dict) and only_tracked: |
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327 for f, s in map.items(): |
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328 if s.state != b'r': |
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329 addpath(f) |
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330 elif only_tracked: |
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331 msg = b"`only_tracked` is only supported with a dict source" |
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332 raise error.ProgrammingError(msg) |
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333 else: |
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334 for f in map: |
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335 addpath(f) |
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336 |
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337 def addpath(self, path): |
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338 # type: (bytes) -> None |
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339 dirs = self._dirs |
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340 for base in finddirs(path): |
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341 if base.endswith(b'/'): |
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342 raise ValueError( |
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343 "found invalid consecutive slashes in path: %r" % base |
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344 ) |
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345 if base in dirs: |
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346 dirs[base] += 1 |
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347 return |
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348 dirs[base] = 1 |
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349 |
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350 def delpath(self, path): |
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351 # type: (bytes) -> None |
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352 dirs = self._dirs |
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353 for base in finddirs(path): |
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354 if dirs[base] > 1: |
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355 dirs[base] -= 1 |
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356 return |
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357 del dirs[base] |
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358 |
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359 def __iter__(self): |
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360 return iter(self._dirs) |
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361 |
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362 def __contains__(self, d): |
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363 # type: (bytes) -> bool |
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364 return d in self._dirs |
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365 |
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366 |
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367 if util.safehasattr(parsers, 'dirs'): |
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368 dirs = parsers.dirs |
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369 |
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370 if rustdirs is not None: |
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371 dirs = rustdirs |
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372 |
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373 |
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374 # forward two methods from posixpath that do what we need, but we'd |
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375 # rather not let our internals know that we're thinking in posix terms |
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376 # - instead we'll let them be oblivious. |
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377 join = posixpath.join |
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378 dirname = posixpath.dirname # type: Callable[[bytes], bytes] |