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annotate mercurial/pathutil.py @ 25285:46f2df2f0680

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pathutil: restate dirname and join as forwards to posixpath I've done this as its own step so that it's easy to see that the posixpath implementations pass the doctests in this package. In a future patch I'll just make these pure forwards of the methods so that things using pathutil can be oblivious to the posix nature of these functions.
author Augie Fackler <augie@google.com>
date Tue, 26 May 2015 14:30:48 -0400
parents 660b178f49c7
children 127a11f705d9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
25285
46f2df2f0680 pathutil: restate dirname and join as forwards to posixpath
Augie Fackler <augie@google.com>
parents: 25281
diff changeset
1 import os, errno, stat, posixpath
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2
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3 import encoding
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4 import util
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5 from i18n import _
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6
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7 def _lowerclean(s):
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8 return encoding.hfsignoreclean(s.lower())
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9
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10 class pathauditor(object):
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11 '''ensure that a filesystem path contains no banned components.
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12 the following properties of a path are checked:
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13
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14 - ends with a directory separator
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15 - under top-level .hg
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16 - starts at the root of a windows drive
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17 - contains ".."
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18 - traverses a symlink (e.g. a/symlink_here/b)
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19 - inside a nested repository (a callback can be used to approve
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20 some nested repositories, e.g., subrepositories)
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21 '''
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22
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23 def __init__(self, root, callback=None):
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24 self.audited = set()
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25 self.auditeddir = set()
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26 self.root = root
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27 self.callback = callback
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28 if os.path.lexists(root) and not util.checkcase(root):
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29 self.normcase = util.normcase
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30 else:
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31 self.normcase = lambda x: x
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32
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33 def __call__(self, path):
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34 '''Check the relative path.
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35 path may contain a pattern (e.g. foodir/**.txt)'''
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36
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37 path = util.localpath(path)
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38 normpath = self.normcase(path)
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39 if normpath in self.audited:
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40 return
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41 # AIX ignores "/" at end of path, others raise EISDIR.
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42 if util.endswithsep(path):
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43 raise util.Abort(_("path ends in directory separator: %s") % path)
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44 parts = util.splitpath(path)
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45 if (os.path.splitdrive(path)[0]
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46 or _lowerclean(parts[0]) in ('.hg', '.hg.', '')
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47 or os.pardir in parts):
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48 raise util.Abort(_("path contains illegal component: %s") % path)
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49 # Windows shortname aliases
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50 for p in parts:
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51 if "~" in p:
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52 first, last = p.split("~", 1)
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53 if last.isdigit() and first.upper() in ["HG", "HG8B6C"]:
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54 raise util.Abort(_("path contains illegal component: %s")
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55 % path)
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56 if '.hg' in _lowerclean(path):
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57 lparts = [_lowerclean(p.lower()) for p in parts]
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58 for p in '.hg', '.hg.':
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59 if p in lparts[1:]:
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60 pos = lparts.index(p)
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61 base = os.path.join(*parts[:pos])
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62 raise util.Abort(_("path '%s' is inside nested repo %r")
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63 % (path, base))
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64
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65 normparts = util.splitpath(normpath)
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66 assert len(parts) == len(normparts)
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67
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68 parts.pop()
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69 normparts.pop()
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70 prefixes = []
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71 while parts:
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72 prefix = os.sep.join(parts)
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73 normprefix = os.sep.join(normparts)
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74 if normprefix in self.auditeddir:
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75 break
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76 curpath = os.path.join(self.root, prefix)
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77 try:
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78 st = os.lstat(curpath)
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79 except OSError, err:
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80 # EINVAL can be raised as invalid path syntax under win32.
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81 # They must be ignored for patterns can be checked too.
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82 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL):
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83 raise
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84 else:
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85 if stat.S_ISLNK(st.st_mode):
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86 raise util.Abort(
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87 _('path %r traverses symbolic link %r')
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88 % (path, prefix))
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89 elif (stat.S_ISDIR(st.st_mode) and
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90 os.path.isdir(os.path.join(curpath, '.hg'))):
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91 if not self.callback or not self.callback(curpath):
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92 raise util.Abort(_("path '%s' is inside nested "
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93 "repo %r")
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94 % (path, prefix))
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95 prefixes.append(normprefix)
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96 parts.pop()
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97 normparts.pop()
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98
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99 self.audited.add(normpath)
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100 # only add prefixes to the cache after checking everything: we don't
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101 # want to add "foo/bar/baz" before checking if there's a "foo/.hg"
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102 self.auditeddir.update(prefixes)
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103
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104 def check(self, path):
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105 try:
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106 self(path)
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107 return True
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108 except (OSError, util.Abort):
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109 return False
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110
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111 def canonpath(root, cwd, myname, auditor=None):
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112 '''return the canonical path of myname, given cwd and root'''
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113 if util.endswithsep(root):
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114 rootsep = root
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115 else:
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116 rootsep = root + os.sep
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117 name = myname
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118 if not os.path.isabs(name):
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119 name = os.path.join(root, cwd, name)
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120 name = os.path.normpath(name)
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121 if auditor is None:
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122 auditor = pathauditor(root)
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123 if name != rootsep and name.startswith(rootsep):
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124 name = name[len(rootsep):]
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125 auditor(name)
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126 return util.pconvert(name)
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127 elif name == root:
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128 return ''
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129 else:
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130 # Determine whether `name' is in the hierarchy at or beneath `root',
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131 # by iterating name=dirname(name) until that causes no change (can't
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132 # check name == '/', because that doesn't work on windows). The list
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133 # `rel' holds the reversed list of components making up the relative
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134 # file name we want.
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135 rel = []
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136 while True:
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137 try:
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138 s = util.samefile(name, root)
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139 except OSError:
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140 s = False
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141 if s:
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142 if not rel:
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143 # name was actually the same as root (maybe a symlink)
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144 return ''
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145 rel.reverse()
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146 name = os.path.join(*rel)
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147 auditor(name)
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148 return util.pconvert(name)
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149 dirname, basename = util.split(name)
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150 rel.append(basename)
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151 if dirname == name:
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152 break
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153 name = dirname
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154
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155 # A common mistake is to use -R, but specify a file relative to the repo
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156 # instead of cwd. Detect that case, and provide a hint to the user.
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157 hint = None
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158 try:
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159 if cwd != root:
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160 canonpath(root, root, myname, auditor)
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161 hint = (_("consider using '--cwd %s'")
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162 % os.path.relpath(root, cwd))
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163 except util.Abort:
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164 pass
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165
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166 raise util.Abort(_("%s not under root '%s'") % (myname, root),
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167 hint=hint)
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168
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169 def normasprefix(path):
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170 '''normalize the specified path as path prefix
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171
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172 Returned value can be used safely for "p.startswith(prefix)",
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173 "p[len(prefix):]", and so on.
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174
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175 For efficiency, this expects "path" argument to be already
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176 normalized by "os.path.normpath", "os.path.realpath", and so on.
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177
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178 See also issue3033 for detail about need of this function.
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179
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180 >>> normasprefix('/foo/bar').replace(os.sep, '/')
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181 '/foo/bar/'
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182 >>> normasprefix('/').replace(os.sep, '/')
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183 '/'
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184 '''
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185 d, p = os.path.splitdrive(path)
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186 if len(p) != len(os.sep):
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187 return path + os.sep
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188 else:
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189 return path
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190
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191 def join(*args):
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192 '''Join two or more pathname components, inserting '/' as needed.
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193
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194 Based on the posix os.path.join() implementation.
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195
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196 >>> join('foo', 'bar')
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197 'foo/bar'
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198 >>> join('/foo', 'bar')
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199 '/foo/bar'
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200 >>> join('foo', '/bar')
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201 '/bar'
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202 >>> join('foo', 'bar/')
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203 'foo/bar/'
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204 >>> join('foo', 'bar', 'gah')
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205 'foo/bar/gah'
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206 >>> join('foo')
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207 'foo'
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208 >>> join('', 'foo')
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209 'foo'
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210 >>> join('foo/', 'bar')
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211 'foo/bar'
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212 >>> join('', '', '')
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213 ''
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214 >>> join ('foo', '', '', 'bar')
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215 'foo/bar'
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216 '''
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217 return posixpath.join(*args)
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218
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219 def dirname(path):
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220 '''returns the directory portion of the given path
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221
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222 Based on the posix os.path.split() implementation.
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223
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224 >>> dirname('foo')
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225 ''
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226 >>> dirname('foo/')
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227 'foo'
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228 >>> dirname('foo/bar')
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229 'foo'
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230 >>> dirname('/foo')
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231 '/'
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232 >>> dirname('/foo/bar')
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233 '/foo'
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234 >>> dirname('/foo//bar/poo')
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235 '/foo//bar'
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236 >>> dirname('/foo//bar')
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237 '/foo'
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238 '''
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239 return posixpath.dirname(path)