Mercurial > hg
annotate mercurial/pathutil.py @ 43131:c17a63eb5d4c
sidedata: apply basic but tight security around exchange
We don't currently have code to deal with exchange between repository using
sidedata and repository not using sidedata. Until we implement such code (eg:
dropping side data when pushing to a non-sidedata repo) we prevent the two kind
of repo to speak to each other. This is somewhere similar to what 'treemanifest'
does.
Note that sidedata exchange is broken unless one use changegroup v3 anyway. See
next changeset for details.
Differential Revision: https://phab.mercurial-scm.org/D6939
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Sun, 06 Oct 2019 23:36:51 -0400 |
parents | 687b865b95ad |
children | c21aca51b392 |
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1 from __future__ import absolute_import |
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2 |
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3 import errno |
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4 import os |
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5 import posixpath |
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6 import stat |
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7 |
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8 from .i18n import _ |
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9 from . import ( |
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10 encoding, |
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11 error, |
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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 |
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17 def _lowerclean(s): |
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18 return encoding.hfsignoreclean(s.lower()) |
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19 |
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20 |
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21 class pathauditor(object): |
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22 '''ensure that a filesystem path contains no banned components. |
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23 the following properties of a path are checked: |
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24 |
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25 - ends with a directory separator |
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26 - under top-level .hg |
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27 - starts at the root of a windows drive |
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28 - contains ".." |
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29 |
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30 More check are also done about the file system states: |
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31 - traverses a symlink (e.g. a/symlink_here/b) |
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32 - inside a nested repository (a callback can be used to approve |
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33 some nested repositories, e.g., subrepositories) |
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34 |
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35 The file system checks are only done when 'realfs' is set to True (the |
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36 default). They should be disable then we are auditing path for operation on |
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37 stored history. |
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38 |
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39 If 'cached' is set to True, audited paths and sub-directories are cached. |
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40 Be careful to not keep the cache of unmanaged directories for long because |
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41 audited paths may be replaced with symlinks. |
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42 ''' |
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43 |
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44 def __init__(self, root, callback=None, realfs=True, cached=False): |
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45 self.audited = set() |
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46 self.auditeddir = set() |
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47 self.root = root |
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48 self._realfs = realfs |
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49 self._cached = cached |
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50 self.callback = callback |
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51 if os.path.lexists(root) and not util.fscasesensitive(root): |
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52 self.normcase = util.normcase |
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53 else: |
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54 self.normcase = lambda x: x |
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55 |
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56 def __call__(self, path, mode=None): |
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57 '''Check the relative path. |
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58 path may contain a pattern (e.g. foodir/**.txt)''' |
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59 |
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60 path = util.localpath(path) |
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61 normpath = self.normcase(path) |
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62 if normpath in self.audited: |
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63 return |
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64 # AIX ignores "/" at end of path, others raise EISDIR. |
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65 if util.endswithsep(path): |
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66 raise error.Abort(_(b"path ends in directory separator: %s") % path) |
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67 parts = util.splitpath(path) |
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68 if ( |
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69 os.path.splitdrive(path)[0] |
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70 or _lowerclean(parts[0]) in (b'.hg', b'.hg.', b'') |
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71 or pycompat.ospardir in parts |
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72 ): |
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73 raise error.Abort(_(b"path contains illegal component: %s") % path) |
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74 # Windows shortname aliases |
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75 for p in parts: |
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76 if b"~" in p: |
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77 first, last = p.split(b"~", 1) |
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78 if last.isdigit() and first.upper() in [b"HG", b"HG8B6C"]: |
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79 raise error.Abort( |
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80 _(b"path contains illegal component: %s") % path |
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81 ) |
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82 if b'.hg' in _lowerclean(path): |
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83 lparts = [_lowerclean(p.lower()) for p in parts] |
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84 for p in b'.hg', b'.hg.': |
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85 if p in lparts[1:]: |
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86 pos = lparts.index(p) |
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87 base = os.path.join(*parts[:pos]) |
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88 raise error.Abort( |
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89 _(b"path '%s' is inside nested repo %r") |
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90 % (path, pycompat.bytestr(base)) |
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91 ) |
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92 |
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93 normparts = util.splitpath(normpath) |
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94 assert len(parts) == len(normparts) |
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95 |
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96 parts.pop() |
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97 normparts.pop() |
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98 prefixes = [] |
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99 # It's important that we check the path parts starting from the root. |
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100 # This means we won't accidentally traverse a symlink into some other |
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101 # filesystem (which is potentially expensive to access). |
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102 for i in range(len(parts)): |
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103 prefix = pycompat.ossep.join(parts[: i + 1]) |
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104 normprefix = pycompat.ossep.join(normparts[: i + 1]) |
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105 if normprefix in self.auditeddir: |
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106 continue |
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107 if self._realfs: |
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108 self._checkfs(prefix, path) |
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109 prefixes.append(normprefix) |
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110 |
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111 if self._cached: |
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112 self.audited.add(normpath) |
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113 # only add prefixes to the cache after checking everything: we don't |
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114 # want to add "foo/bar/baz" before checking if there's a "foo/.hg" |
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115 self.auditeddir.update(prefixes) |
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116 |
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117 def _checkfs(self, prefix, path): |
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118 """raise exception if a file system backed check fails""" |
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119 curpath = os.path.join(self.root, prefix) |
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120 try: |
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121 st = os.lstat(curpath) |
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122 except OSError as err: |
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123 # EINVAL can be raised as invalid path syntax under win32. |
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124 # They must be ignored for patterns can be checked too. |
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125 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): |
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126 raise |
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127 else: |
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128 if stat.S_ISLNK(st.st_mode): |
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129 msg = _(b'path %r traverses symbolic link %r') % ( |
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130 pycompat.bytestr(path), |
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131 pycompat.bytestr(prefix), |
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132 ) |
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133 raise error.Abort(msg) |
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134 elif stat.S_ISDIR(st.st_mode) and os.path.isdir( |
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135 os.path.join(curpath, b'.hg') |
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136 ): |
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137 if not self.callback or not self.callback(curpath): |
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138 msg = _(b"path '%s' is inside nested repo %r") |
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139 raise error.Abort(msg % (path, pycompat.bytestr(prefix))) |
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140 |
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141 def check(self, path): |
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142 try: |
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143 self(path) |
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144 return True |
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145 except (OSError, error.Abort): |
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146 return False |
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147 |
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148 |
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149 def canonpath(root, cwd, myname, auditor=None): |
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150 '''return the canonical path of myname, given cwd and root |
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151 |
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152 >>> def check(root, cwd, myname): |
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153 ... a = pathauditor(root, realfs=False) |
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154 ... try: |
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155 ... return canonpath(root, cwd, myname, a) |
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156 ... except error.Abort: |
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157 ... return 'aborted' |
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158 >>> def unixonly(root, cwd, myname, expected='aborted'): |
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159 ... if pycompat.iswindows: |
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160 ... return expected |
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161 ... return check(root, cwd, myname) |
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162 >>> def winonly(root, cwd, myname, expected='aborted'): |
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163 ... if not pycompat.iswindows: |
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164 ... return expected |
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165 ... return check(root, cwd, myname) |
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166 >>> winonly(b'd:\\\\repo', b'c:\\\\dir', b'filename') |
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167 'aborted' |
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168 >>> winonly(b'c:\\\\repo', b'c:\\\\dir', b'filename') |
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169 'aborted' |
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170 >>> winonly(b'c:\\\\repo', b'c:\\\\', b'filename') |
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171 'aborted' |
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172 >>> winonly(b'c:\\\\repo', b'c:\\\\', b'repo\\\\filename', |
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173 ... b'filename') |
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174 'filename' |
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175 >>> winonly(b'c:\\\\repo', b'c:\\\\repo', b'filename', b'filename') |
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176 'filename' |
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177 >>> winonly(b'c:\\\\repo', b'c:\\\\repo\\\\subdir', b'filename', |
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178 ... b'subdir/filename') |
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179 'subdir/filename' |
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180 >>> unixonly(b'/repo', b'/dir', b'filename') |
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181 'aborted' |
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182 >>> unixonly(b'/repo', b'/', b'filename') |
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183 'aborted' |
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184 >>> unixonly(b'/repo', b'/', b'repo/filename', b'filename') |
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185 'filename' |
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186 >>> unixonly(b'/repo', b'/repo', b'filename', b'filename') |
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187 'filename' |
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188 >>> unixonly(b'/repo', b'/repo/subdir', b'filename', b'subdir/filename') |
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189 'subdir/filename' |
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190 ''' |
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191 if util.endswithsep(root): |
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192 rootsep = root |
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193 else: |
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194 rootsep = root + pycompat.ossep |
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195 name = myname |
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196 if not os.path.isabs(name): |
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197 name = os.path.join(root, cwd, name) |
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198 name = os.path.normpath(name) |
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199 if auditor is None: |
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200 auditor = pathauditor(root) |
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201 if name != rootsep and name.startswith(rootsep): |
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202 name = name[len(rootsep) :] |
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203 auditor(name) |
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204 return util.pconvert(name) |
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205 elif name == root: |
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206 return b'' |
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207 else: |
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208 # Determine whether `name' is in the hierarchy at or beneath `root', |
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209 # by iterating name=dirname(name) until that causes no change (can't |
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210 # check name == '/', because that doesn't work on windows). The list |
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211 # `rel' holds the reversed list of components making up the relative |
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212 # file name we want. |
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213 rel = [] |
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214 while True: |
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215 try: |
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216 s = util.samefile(name, root) |
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217 except OSError: |
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218 s = False |
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219 if s: |
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220 if not rel: |
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221 # name was actually the same as root (maybe a symlink) |
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222 return b'' |
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223 rel.reverse() |
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224 name = os.path.join(*rel) |
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225 auditor(name) |
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226 return util.pconvert(name) |
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227 dirname, basename = util.split(name) |
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228 rel.append(basename) |
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229 if dirname == name: |
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230 break |
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231 name = dirname |
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232 |
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233 # A common mistake is to use -R, but specify a file relative to the repo |
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234 # instead of cwd. Detect that case, and provide a hint to the user. |
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235 hint = None |
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236 try: |
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237 if cwd != root: |
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238 canonpath(root, root, myname, auditor) |
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239 relpath = util.pathto(root, cwd, b'') |
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240 if relpath.endswith(pycompat.ossep): |
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241 relpath = relpath[:-1] |
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242 hint = _(b"consider using '--cwd %s'") % relpath |
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243 except error.Abort: |
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244 pass |
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245 |
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246 raise error.Abort( |
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247 _(b"%s not under root '%s'") % (myname, root), hint=hint |
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248 ) |
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249 |
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250 |
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251 def normasprefix(path): |
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252 '''normalize the specified path as path prefix |
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253 |
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254 Returned value can be used safely for "p.startswith(prefix)", |
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255 "p[len(prefix):]", and so on. |
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256 |
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257 For efficiency, this expects "path" argument to be already |
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258 normalized by "os.path.normpath", "os.path.realpath", and so on. |
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259 |
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260 See also issue3033 for detail about need of this function. |
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261 |
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262 >>> normasprefix(b'/foo/bar').replace(pycompat.ossep, b'/') |
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263 '/foo/bar/' |
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264 >>> normasprefix(b'/').replace(pycompat.ossep, b'/') |
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265 '/' |
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266 ''' |
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267 d, p = os.path.splitdrive(path) |
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268 if len(p) != len(pycompat.ossep): |
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269 return path + pycompat.ossep |
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270 else: |
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271 return path |
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272 |
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273 |
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274 # forward two methods from posixpath that do what we need, but we'd |
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275 # rather not let our internals know that we're thinking in posix terms |
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276 # - instead we'll let them be oblivious. |
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277 join = posixpath.join |
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278 dirname = posixpath.dirname |