Mercurial > hg
annotate mercurial/pathutil.py @ 50757:19108906abaf stable
extensions: imp module is removed in Python 3.12 - use importlib to load files
imp has been deprecated for a long time, and has finally been removed in Python
3.12 .
imp was only used for loading extensions that has been specified with direct
.py path or path to a package directory. The same use cases can be achieved
quite simple with importlib, , possiby with small changes in corner cases with
undefined behaviour, such as extensions without .py source.
There might also be corner cases and undefined behaviour around use of
sys.modules and reloading.
author | Mads Kiilerich <mads@kiilerich.com> |
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date | Wed, 28 Jun 2023 14:23:13 +0200 |
parents | bc83ebe07bf0 |
children | d718eddf01d9 |
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 # It's important that we check the path parts starting from the root. |
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111 # We don't want to add "foo/bar/baz" to auditeddir before checking if |
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112 # there's a "foo/.hg" directory. This also means we won't accidentally |
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113 # traverse a symlink into some other filesystem (which is potentially |
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114 # expensive to access). |
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115 for prefix in finddirs_rev_noroot(path): |
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116 if prefix in self.auditeddir: |
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117 res = self.auditeddir[prefix] |
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118 else: |
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119 res = pathauditor._checkfs_exists( |
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120 self.root, prefix, path, self.callback |
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121 ) |
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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 @staticmethod |
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131 def _checkfs_exists( |
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132 root, |
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133 prefix: bytes, |
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134 path: bytes, |
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135 callback: Optional[Callable[[bytes], bool]] = None, |
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136 ): |
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137 """raise exception if a file system backed check fails. |
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138 |
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139 Return a bool that indicates that the directory (or file) exists.""" |
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140 curpath = os.path.join(root, prefix) |
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141 try: |
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142 st = os.lstat(curpath) |
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143 except OSError as err: |
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144 if err.errno == errno.ENOENT: |
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145 return False |
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146 # EINVAL can be raised as invalid path syntax under win32. |
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147 # They must be ignored for patterns can be checked too. |
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148 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): |
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149 raise |
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150 else: |
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151 if stat.S_ISLNK(st.st_mode): |
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152 msg = _(b'path %r traverses symbolic link %r') % ( |
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153 pycompat.bytestr(path), |
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154 pycompat.bytestr(prefix), |
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155 ) |
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156 raise error.Abort(msg) |
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157 elif stat.S_ISDIR(st.st_mode) and os.path.isdir( |
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158 os.path.join(curpath, b'.hg') |
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159 ): |
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160 if not callback or not callback(curpath): |
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161 msg = _(b"path '%s' is inside nested repo %r") |
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162 raise error.Abort(msg % (path, pycompat.bytestr(prefix))) |
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163 return True |
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164 |
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165 def check(self, path): |
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166 # type: (bytes) -> bool |
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167 try: |
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168 self(path) |
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169 return True |
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170 except (OSError, error.Abort): |
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171 return False |
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172 |
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173 @contextlib.contextmanager |
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174 def cached(self): |
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175 if self._cached: |
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176 yield |
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177 else: |
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178 try: |
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179 self._cached = True |
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180 yield |
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181 finally: |
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182 self.audited.clear() |
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183 self.auditeddir.clear() |
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184 self._cached = False |
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185 |
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186 |
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187 def canonpath(root, cwd, myname, auditor=None): |
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188 # type: (bytes, bytes, bytes, Optional[pathauditor]) -> bytes |
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189 """return the canonical path of myname, given cwd and root |
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190 |
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191 >>> def check(root, cwd, myname): |
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192 ... a = pathauditor(root, realfs=False) |
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193 ... try: |
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194 ... return canonpath(root, cwd, myname, a) |
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195 ... except error.Abort: |
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196 ... return 'aborted' |
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197 >>> def unixonly(root, cwd, myname, expected='aborted'): |
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198 ... if pycompat.iswindows: |
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199 ... return expected |
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200 ... return check(root, cwd, myname) |
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201 >>> def winonly(root, cwd, myname, expected='aborted'): |
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202 ... if not pycompat.iswindows: |
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203 ... return expected |
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204 ... return check(root, cwd, myname) |
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205 >>> winonly(b'd:\\\\repo', b'c:\\\\dir', b'filename') |
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206 'aborted' |
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207 >>> winonly(b'c:\\\\repo', b'c:\\\\dir', b'filename') |
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208 'aborted' |
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209 >>> winonly(b'c:\\\\repo', b'c:\\\\', b'filename') |
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210 'aborted' |
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211 >>> winonly(b'c:\\\\repo', b'c:\\\\', b'repo\\\\filename', |
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212 ... b'filename') |
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213 'filename' |
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214 >>> winonly(b'c:\\\\repo', b'c:\\\\repo', b'filename', b'filename') |
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215 'filename' |
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216 >>> winonly(b'c:\\\\repo', b'c:\\\\repo\\\\subdir', b'filename', |
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217 ... b'subdir/filename') |
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218 'subdir/filename' |
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219 >>> unixonly(b'/repo', b'/dir', b'filename') |
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220 'aborted' |
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221 >>> unixonly(b'/repo', b'/', b'filename') |
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222 'aborted' |
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223 >>> unixonly(b'/repo', b'/', b'repo/filename', b'filename') |
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224 'filename' |
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225 >>> unixonly(b'/repo', b'/repo', b'filename', b'filename') |
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226 'filename' |
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227 >>> unixonly(b'/repo', b'/repo/subdir', b'filename', b'subdir/filename') |
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228 'subdir/filename' |
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229 """ |
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230 if util.endswithsep(root): |
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231 rootsep = root |
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232 else: |
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233 rootsep = root + pycompat.ossep |
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234 name = myname |
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235 if not os.path.isabs(name): |
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236 name = os.path.join(root, cwd, name) |
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237 name = os.path.normpath(name) |
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238 if auditor is None: |
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239 auditor = pathauditor(root) |
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240 if name != rootsep and name.startswith(rootsep): |
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241 name = name[len(rootsep) :] |
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242 auditor(name) |
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243 return util.pconvert(name) |
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244 elif name == root: |
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245 return b'' |
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246 else: |
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247 # Determine whether `name' is in the hierarchy at or beneath `root', |
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248 # by iterating name=dirname(name) until that causes no change (can't |
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249 # check name == '/', because that doesn't work on windows). The list |
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250 # `rel' holds the reversed list of components making up the relative |
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251 # file name we want. |
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252 rel = [] |
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253 while True: |
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254 try: |
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255 s = util.samefile(name, root) |
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256 except OSError: |
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257 s = False |
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258 if s: |
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259 if not rel: |
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260 # name was actually the same as root (maybe a symlink) |
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261 return b'' |
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262 rel.reverse() |
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263 name = os.path.join(*rel) |
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264 auditor(name) |
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265 return util.pconvert(name) |
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266 dirname, basename = util.split(name) |
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267 rel.append(basename) |
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268 if dirname == name: |
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269 break |
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270 name = dirname |
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271 |
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272 # A common mistake is to use -R, but specify a file relative to the repo |
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273 # instead of cwd. Detect that case, and provide a hint to the user. |
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274 hint = None |
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275 try: |
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276 if cwd != root: |
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277 canonpath(root, root, myname, auditor) |
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278 relpath = util.pathto(root, cwd, b'') |
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279 if relpath.endswith(pycompat.ossep): |
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280 relpath = relpath[:-1] |
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281 hint = _(b"consider using '--cwd %s'") % relpath |
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282 except error.Abort: |
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283 pass |
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284 |
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285 raise error.Abort( |
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286 _(b"%s not under root '%s'") % (myname, root), hint=hint |
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287 ) |
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288 |
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289 |
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290 def normasprefix(path): |
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291 # type: (bytes) -> bytes |
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292 """normalize the specified path as path prefix |
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293 |
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294 Returned value can be used safely for "p.startswith(prefix)", |
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295 "p[len(prefix):]", and so on. |
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296 |
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297 For efficiency, this expects "path" argument to be already |
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298 normalized by "os.path.normpath", "os.path.realpath", and so on. |
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299 |
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300 See also issue3033 for detail about need of this function. |
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301 |
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302 >>> normasprefix(b'/foo/bar').replace(pycompat.ossep, b'/') |
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303 '/foo/bar/' |
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304 >>> normasprefix(b'/').replace(pycompat.ossep, b'/') |
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305 '/' |
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306 """ |
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307 d, p = os.path.splitdrive(path) |
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308 if len(p) != len(pycompat.ossep): |
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309 return path + pycompat.ossep |
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310 else: |
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311 return path |
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312 |
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313 |
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314 def finddirs(path): |
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315 # type: (bytes) -> Iterator[bytes] |
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316 pos = path.rfind(b'/') |
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317 while pos != -1: |
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318 yield path[:pos] |
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319 pos = path.rfind(b'/', 0, pos) |
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320 yield b'' |
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321 |
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322 |
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323 def finddirs_rev_noroot(path: bytes) -> Iterator[bytes]: |
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324 pos = path.find(pycompat.ossep) |
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325 while pos != -1: |
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326 yield path[:pos] |
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327 pos = path.find(pycompat.ossep, pos + 1) |
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328 |
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329 |
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330 class dirs: |
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331 '''a multiset of directory names from a set of file paths''' |
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332 |
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333 def __init__(self, map, only_tracked=False): |
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334 """ |
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335 a dict map indicates a dirstate while a list indicates a manifest |
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336 """ |
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337 self._dirs = {} |
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338 addpath = self.addpath |
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339 if isinstance(map, dict) and only_tracked: |
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340 for f, s in map.items(): |
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341 if s.state != b'r': |
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342 addpath(f) |
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343 elif only_tracked: |
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344 msg = b"`only_tracked` is only supported with a dict source" |
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345 raise error.ProgrammingError(msg) |
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346 else: |
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347 for f in map: |
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348 addpath(f) |
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349 |
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350 def addpath(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 base.endswith(b'/'): |
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355 raise ValueError( |
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356 "found invalid consecutive slashes in path: %r" % base |
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357 ) |
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358 if base in dirs: |
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359 dirs[base] += 1 |
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360 return |
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361 dirs[base] = 1 |
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362 |
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363 def delpath(self, path): |
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364 # type: (bytes) -> None |
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365 dirs = self._dirs |
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366 for base in finddirs(path): |
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367 if dirs[base] > 1: |
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368 dirs[base] -= 1 |
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369 return |
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370 del dirs[base] |
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371 |
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372 def __iter__(self): |
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373 return iter(self._dirs) |
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374 |
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375 def __contains__(self, d): |
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376 # type: (bytes) -> bool |
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377 return d in self._dirs |
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378 |
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379 |
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380 if util.safehasattr(parsers, 'dirs'): |
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381 dirs = parsers.dirs |
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382 |
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383 if rustdirs is not None: |
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384 dirs = rustdirs |
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385 |
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386 |
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387 # forward two methods from posixpath that do what we need, but we'd |
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388 # rather not let our internals know that we're thinking in posix terms |
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389 # - instead we'll let them be oblivious. |
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390 join = posixpath.join |
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391 dirname = posixpath.dirname # type: Callable[[bytes], bytes] |