Mercurial > hg
annotate mercurial/pathutil.py @ 27015:341cb90ffd18
util: disable floating point stat times (issue4836)
Alternate fix for this issue which avoids putting extra function calls
and exception handling in the fast path.
For almost all purposes, integer timestamps are preferable to
Mercurial. It stores integer timestamps in the dirstate and would thus
like to avoid doing any float/int comparisons or conversions. We will
continue to have to deal with 1-second granularity on filesystems for
quite some time, so this won't significantly hinder our capabilities.
This has some impact on our file cache validation code in that it
lowers timestamp resolution. But as we still have to deal with
low-resolution filesystems, we're not relying on this anyway.
An alternate approach is to use stat[ST_MTIME], which is guaranteed to
be an integer. But since this support isn't already in our extension,
we can't depend on it being available without adding a hard Python->C
API dependency that's painful for people like yours truly who have
bisect regularly and people without compilers.
author | Matt Mackall <mpm@selenic.com> |
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date | Thu, 19 Nov 2015 13:21:24 -0600 |
parents | 56b2bcea2529 |
children | 6d29ce250a3d |
rev | line source |
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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 util, |
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13 ) |
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14 |
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15 def _lowerclean(s): |
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16 return encoding.hfsignoreclean(s.lower()) |
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17 |
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18 class pathauditor(object): |
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19 '''ensure that a filesystem path contains no banned components. |
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20 the following properties of a path are checked: |
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21 |
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22 - ends with a directory separator |
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23 - under top-level .hg |
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24 - starts at the root of a windows drive |
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25 - contains ".." |
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26 - traverses a symlink (e.g. a/symlink_here/b) |
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27 - inside a nested repository (a callback can be used to approve |
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28 some nested repositories, e.g., subrepositories) |
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29 ''' |
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30 |
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31 def __init__(self, root, callback=None): |
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32 self.audited = set() |
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33 self.auditeddir = set() |
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34 self.root = root |
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35 self.callback = callback |
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36 if os.path.lexists(root) and not util.checkcase(root): |
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37 self.normcase = util.normcase |
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38 else: |
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39 self.normcase = lambda x: x |
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40 |
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41 def __call__(self, path): |
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42 '''Check the relative path. |
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43 path may contain a pattern (e.g. foodir/**.txt)''' |
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44 |
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45 path = util.localpath(path) |
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46 normpath = self.normcase(path) |
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47 if normpath in self.audited: |
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48 return |
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49 # AIX ignores "/" at end of path, others raise EISDIR. |
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50 if util.endswithsep(path): |
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51 raise error.Abort(_("path ends in directory separator: %s") % path) |
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52 parts = util.splitpath(path) |
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53 if (os.path.splitdrive(path)[0] |
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54 or _lowerclean(parts[0]) in ('.hg', '.hg.', '') |
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55 or os.pardir in parts): |
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56 raise error.Abort(_("path contains illegal component: %s") % path) |
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57 # Windows shortname aliases |
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58 for p in parts: |
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59 if "~" in p: |
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60 first, last = p.split("~", 1) |
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61 if last.isdigit() and first.upper() in ["HG", "HG8B6C"]: |
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62 raise error.Abort(_("path contains illegal component: %s") |
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63 % path) |
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64 if '.hg' in _lowerclean(path): |
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65 lparts = [_lowerclean(p.lower()) for p in parts] |
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66 for p in '.hg', '.hg.': |
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67 if p in lparts[1:]: |
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68 pos = lparts.index(p) |
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69 base = os.path.join(*parts[:pos]) |
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70 raise error.Abort(_("path '%s' is inside nested repo %r") |
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71 % (path, base)) |
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72 |
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73 normparts = util.splitpath(normpath) |
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74 assert len(parts) == len(normparts) |
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75 |
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76 parts.pop() |
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77 normparts.pop() |
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78 prefixes = [] |
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79 while parts: |
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80 prefix = os.sep.join(parts) |
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81 normprefix = os.sep.join(normparts) |
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82 if normprefix in self.auditeddir: |
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83 break |
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84 curpath = os.path.join(self.root, prefix) |
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85 try: |
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86 st = os.lstat(curpath) |
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87 except OSError as err: |
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88 # EINVAL can be raised as invalid path syntax under win32. |
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89 # They must be ignored for patterns can be checked too. |
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90 if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): |
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91 raise |
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92 else: |
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93 if stat.S_ISLNK(st.st_mode): |
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94 raise error.Abort( |
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95 _('path %r traverses symbolic link %r') |
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96 % (path, prefix)) |
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97 elif (stat.S_ISDIR(st.st_mode) and |
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98 os.path.isdir(os.path.join(curpath, '.hg'))): |
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99 if not self.callback or not self.callback(curpath): |
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100 raise error.Abort(_("path '%s' is inside nested " |
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101 "repo %r") |
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102 % (path, prefix)) |
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103 prefixes.append(normprefix) |
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104 parts.pop() |
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105 normparts.pop() |
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106 |
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107 self.audited.add(normpath) |
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108 # only add prefixes to the cache after checking everything: we don't |
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109 # want to add "foo/bar/baz" before checking if there's a "foo/.hg" |
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110 self.auditeddir.update(prefixes) |
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111 |
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112 def check(self, path): |
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113 try: |
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114 self(path) |
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115 return True |
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116 except (OSError, error.Abort): |
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117 return False |
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118 |
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119 def canonpath(root, cwd, myname, auditor=None): |
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120 '''return the canonical path of myname, given cwd and root''' |
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121 if util.endswithsep(root): |
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122 rootsep = root |
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123 else: |
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124 rootsep = root + os.sep |
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125 name = myname |
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126 if not os.path.isabs(name): |
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127 name = os.path.join(root, cwd, name) |
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128 name = os.path.normpath(name) |
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129 if auditor is None: |
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130 auditor = pathauditor(root) |
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131 if name != rootsep and name.startswith(rootsep): |
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132 name = name[len(rootsep):] |
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133 auditor(name) |
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134 return util.pconvert(name) |
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135 elif name == root: |
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136 return '' |
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137 else: |
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138 # Determine whether `name' is in the hierarchy at or beneath `root', |
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139 # by iterating name=dirname(name) until that causes no change (can't |
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140 # check name == '/', because that doesn't work on windows). The list |
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141 # `rel' holds the reversed list of components making up the relative |
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142 # file name we want. |
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143 rel = [] |
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144 while True: |
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145 try: |
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146 s = util.samefile(name, root) |
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147 except OSError: |
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148 s = False |
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149 if s: |
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150 if not rel: |
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151 # name was actually the same as root (maybe a symlink) |
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152 return '' |
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153 rel.reverse() |
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154 name = os.path.join(*rel) |
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155 auditor(name) |
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156 return util.pconvert(name) |
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157 dirname, basename = util.split(name) |
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158 rel.append(basename) |
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159 if dirname == name: |
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160 break |
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161 name = dirname |
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162 |
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163 # A common mistake is to use -R, but specify a file relative to the repo |
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164 # instead of cwd. Detect that case, and provide a hint to the user. |
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165 hint = None |
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166 try: |
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167 if cwd != root: |
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168 canonpath(root, root, myname, auditor) |
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169 hint = (_("consider using '--cwd %s'") |
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170 % os.path.relpath(root, cwd)) |
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171 except error.Abort: |
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172 pass |
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173 |
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174 raise error.Abort(_("%s not under root '%s'") % (myname, root), |
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175 hint=hint) |
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176 |
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177 def normasprefix(path): |
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178 '''normalize the specified path as path prefix |
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179 |
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180 Returned value can be used safely for "p.startswith(prefix)", |
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181 "p[len(prefix):]", and so on. |
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182 |
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183 For efficiency, this expects "path" argument to be already |
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184 normalized by "os.path.normpath", "os.path.realpath", and so on. |
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185 |
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186 See also issue3033 for detail about need of this function. |
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187 |
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188 >>> normasprefix('/foo/bar').replace(os.sep, '/') |
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189 '/foo/bar/' |
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190 >>> normasprefix('/').replace(os.sep, '/') |
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191 '/' |
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192 ''' |
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193 d, p = os.path.splitdrive(path) |
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194 if len(p) != len(os.sep): |
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195 return path + os.sep |
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196 else: |
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197 return path |
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198 |
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199 # forward two methods from posixpath that do what we need, but we'd |
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200 # rather not let our internals know that we're thinking in posix terms |
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201 # - instead we'll let them be oblivious. |
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202 join = posixpath.join |
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203 dirname = posixpath.dirname |