Mercurial > hg
annotate mercurial/pathutil.py @ 48875:6000f5b25c9b
py2: remove simple from __future__ statements
These were needed for Python 2 support. Now that our linter no longer
mandates these, we can start deleting them.
Differential Revision: https://phab.mercurial-scm.org/D12254
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Thu, 03 Mar 2022 17:34:00 +0100 |
parents | 35f1ecd84bd0 |
children | f254fc73d956 |
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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(object): |
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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(object): |
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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 pycompat.iteritems(map): |
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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] |