Mercurial > hg
annotate mercurial/pathutil.py @ 24283:ef22cfff7052
transaction: add a validation stage
The 'transaction' object can now be fed a 'validator' function. This function
will be run right before the transaction is closed to validate its content. The
target usage is hooks. The validation function is expected to raise an exception
when it wants to abort the transaction.
This only introduce the idea with a default no-op validator. Actual usage is in
the next changeset.
author | Pierre-Yves David <pierre-yves.david@fb.com> |
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date | Mon, 09 Mar 2015 22:43:36 -0700 |
parents | a4679a74df14 |
children | 7d6a507a4c53 |
rev | line source |
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1 import os, errno, stat |
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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 raise util.Abort(_("%s not under root '%s'") % (myname, root)) |
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156 |
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157 def normasprefix(path): |
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158 '''normalize the specified path as path prefix |
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159 |
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160 Returned value can be used safely for "p.startswith(prefix)", |
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161 "p[len(prefix):]", and so on. |
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162 |
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163 For efficiency, this expects "path" argument to be already |
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164 normalized by "os.path.normpath", "os.path.realpath", and so on. |
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165 |
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166 See also issue3033 for detail about need of this function. |
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167 |
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168 >>> normasprefix('/foo/bar').replace(os.sep, '/') |
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169 '/foo/bar/' |
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170 >>> normasprefix('/').replace(os.sep, '/') |
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171 '/' |
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172 ''' |
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173 d, p = os.path.splitdrive(path) |
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174 if len(p) != len(os.sep): |
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175 return path + os.sep |
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176 else: |
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177 return path |