Mercurial > hg
annotate mercurial/pathutil.py @ 49907:7623d79f872c
pathutil: add the more efficient finddir iterator
(to be used in subsequent commits)
author | Arseniy Alekseyev <aalekseyev@janestreet.com> |
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date | Fri, 06 Jan 2023 17:29:42 +0000 |
parents | 15175774e1c5 |
children | 789e152a6bdb |
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 typing import ( |
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8 Any, |
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9 Callable, |
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10 Iterator, |
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11 Optional, |
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12 ) |
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13 |
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14 from .i18n import _ |
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15 from . import ( |
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16 encoding, |
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17 error, |
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18 policy, |
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19 pycompat, |
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20 util, |
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21 ) |
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22 |
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23 rustdirs = policy.importrust('dirstate', 'Dirs') |
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24 parsers = policy.importmod('parsers') |
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25 |
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26 |
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27 def _lowerclean(s): |
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28 # type: (bytes) -> bytes |
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29 return encoding.hfsignoreclean(s.lower()) |
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30 |
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31 |
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32 class pathauditor: |
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33 """ensure that a filesystem path contains no banned components. |
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34 the following properties of a path are checked: |
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35 |
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36 - ends with a directory separator |
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37 - under top-level .hg |
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38 - starts at the root of a windows drive |
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39 - contains ".." |
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40 |
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41 More check are also done about the file system states: |
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42 - traverses a symlink (e.g. a/symlink_here/b) |
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43 - inside a nested repository (a callback can be used to approve |
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44 some nested repositories, e.g., subrepositories) |
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45 |
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46 The file system checks are only done when 'realfs' is set to True (the |
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47 default). They should be disable then we are auditing path for operation on |
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48 stored history. |
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49 |
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50 If 'cached' is set to True, audited paths and sub-directories are cached. |
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51 Be careful to not keep the cache of unmanaged directories for long because |
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52 audited paths may be replaced with symlinks. |
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53 """ |
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54 |
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55 def __init__(self, root, callback=None, realfs=True, cached=False): |
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56 self.audited = set() |
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57 self.auditeddir = dict() |
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58 self.root = root |
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59 self._realfs = realfs |
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60 self._cached = cached |
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61 self.callback = callback |
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62 if os.path.lexists(root) and not util.fscasesensitive(root): |
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63 self.normcase = util.normcase |
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64 else: |
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65 self.normcase = lambda x: x |
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66 |
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67 def __call__(self, path, mode=None): |
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68 # type: (bytes, Optional[Any]) -> None |
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69 """Check the relative path. |
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70 path may contain a pattern (e.g. foodir/**.txt)""" |
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71 |
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72 path = util.localpath(path) |
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73 if path in self.audited: |
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74 return |
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75 # AIX ignores "/" at end of path, others raise EISDIR. |
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76 if util.endswithsep(path): |
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77 raise error.InputError( |
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78 _(b"path ends in directory separator: %s") % path |
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79 ) |
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80 parts = util.splitpath(path) |
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81 if ( |
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82 os.path.splitdrive(path)[0] |
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83 or _lowerclean(parts[0]) in (b'.hg', b'.hg.', b'') |
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84 or pycompat.ospardir in parts |
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85 ): |
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86 raise error.InputError( |
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87 _(b"path contains illegal component: %s") % path |
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88 ) |
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89 # Windows shortname aliases |
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90 if b"~" in path: |
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91 for p in parts: |
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92 if b"~" in p: |
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93 first, last = p.split(b"~", 1) |
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94 if last.isdigit() and first.upper() in [b"HG", b"HG8B6C"]: |
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95 raise error.InputError( |
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96 _(b"path contains illegal component: %s") % path |
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97 ) |
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98 if b'.hg' in _lowerclean(path): |
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99 lparts = [_lowerclean(p) for p in parts] |
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100 for p in b'.hg', b'.hg.': |
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101 if p in lparts[1:]: |
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102 pos = lparts.index(p) |
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103 base = os.path.join(*parts[:pos]) |
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104 raise error.InputError( |
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105 _(b"path '%s' is inside nested repo %r") |
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106 % (path, pycompat.bytestr(base)) |
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107 ) |
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108 |
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109 if self._realfs: |
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110 parts.pop() |
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111 # It's important that we check the path parts starting from the root. |
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112 # We don't want to add "foo/bar/baz" to auditeddir before checking if |
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113 # there's a "foo/.hg" directory. This also means we won't accidentally |
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114 # traverse a symlink into some other filesystem (which is potentially |
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115 # expensive to access). |
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116 for i in range(len(parts)): |
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117 prefix = pycompat.ossep.join(parts[: i + 1]) |
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118 if prefix in self.auditeddir: |
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119 res = self.auditeddir[prefix] |
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120 else: |
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121 res = self._checkfs_exists(prefix, path) |
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122 if self._cached: |
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123 self.auditeddir[prefix] = res |
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124 if not res: |
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125 break |
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126 |
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127 if self._cached: |
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128 self.audited.add(path) |
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129 |
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130 def _checkfs_exists(self, prefix: bytes, path: bytes) -> bool: |
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131 """raise exception if a file system backed check fails. |
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132 |
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133 Return a bool that indicates that the directory (or file) exists.""" |
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134 curpath = os.path.join(self.root, prefix) |
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135 try: |
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136 st = os.lstat(curpath) |
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137 except OSError as err: |
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138 if err.errno == errno.ENOENT: |
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139 return False |
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140 # EINVAL can be raised as invalid path syntax under win32. |
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141 # They must be ignored for patterns can be checked too. |
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142 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): |
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143 raise |
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144 else: |
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145 if stat.S_ISLNK(st.st_mode): |
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146 msg = _(b'path %r traverses symbolic link %r') % ( |
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147 pycompat.bytestr(path), |
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148 pycompat.bytestr(prefix), |
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149 ) |
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150 raise error.Abort(msg) |
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151 elif stat.S_ISDIR(st.st_mode) and os.path.isdir( |
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152 os.path.join(curpath, b'.hg') |
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153 ): |
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154 if not self.callback or not self.callback(curpath): |
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155 msg = _(b"path '%s' is inside nested repo %r") |
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156 raise error.Abort(msg % (path, pycompat.bytestr(prefix))) |
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157 return True |
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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 def finddirs_rev_noroot(path: bytes) -> Iterator[bytes]: |
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318 pos = path.find(pycompat.ossep) |
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319 while pos != -1: |
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320 yield path[:pos] |
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321 pos = path.find(pycompat.ossep, pos + 1) |
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322 |
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323 |
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324 class dirs: |
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325 '''a multiset of directory names from a set of file paths''' |
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326 |
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327 def __init__(self, map, only_tracked=False): |
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328 """ |
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329 a dict map indicates a dirstate while a list indicates a manifest |
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330 """ |
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331 self._dirs = {} |
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332 addpath = self.addpath |
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333 if isinstance(map, dict) and only_tracked: |
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334 for f, s in map.items(): |
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335 if s.state != b'r': |
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336 addpath(f) |
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337 elif only_tracked: |
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338 msg = b"`only_tracked` is only supported with a dict source" |
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339 raise error.ProgrammingError(msg) |
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340 else: |
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341 for f in map: |
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342 addpath(f) |
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343 |
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344 def addpath(self, path): |
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345 # type: (bytes) -> None |
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346 dirs = self._dirs |
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347 for base in finddirs(path): |
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348 if base.endswith(b'/'): |
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349 raise ValueError( |
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350 "found invalid consecutive slashes in path: %r" % base |
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351 ) |
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352 if base in dirs: |
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353 dirs[base] += 1 |
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354 return |
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355 dirs[base] = 1 |
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356 |
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357 def delpath(self, path): |
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358 # type: (bytes) -> None |
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359 dirs = self._dirs |
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360 for base in finddirs(path): |
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361 if dirs[base] > 1: |
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362 dirs[base] -= 1 |
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363 return |
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364 del dirs[base] |
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365 |
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366 def __iter__(self): |
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367 return iter(self._dirs) |
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368 |
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369 def __contains__(self, d): |
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370 # type: (bytes) -> bool |
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371 return d in self._dirs |
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372 |
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373 |
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374 if util.safehasattr(parsers, 'dirs'): |
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375 dirs = parsers.dirs |
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376 |
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377 if rustdirs is not None: |
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378 dirs = rustdirs |
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379 |
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380 |
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381 # forward two methods from posixpath that do what we need, but we'd |
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382 # rather not let our internals know that we're thinking in posix terms |
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383 # - instead we'll let them be oblivious. |
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384 join = posixpath.join |
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385 dirname = posixpath.dirname # type: Callable[[bytes], bytes] |