Mercurial > hg
view mercurial/pathutil.py @ 24528:b538ae24aa97
manifestv2: implement slow readdelta() without revdiff
For manifest v2, revlog.revdiff() usually does not provide enough
information to produce a manifest. As a simple workaround, implement
readdelta() by reading both the old and the new manifest and use
manifest.diff() to find the difference. This is several times slower
than the current readdelta() for v1 manifests, but there seems to be
no other simple option, and this is still much faster than returning
the full manifest (at least for verify).
author | Martin von Zweigbergk <martinvonz@google.com> |
---|---|
date | Fri, 27 Mar 2015 20:41:30 -0700 |
parents | a4679a74df14 |
children | 7d6a507a4c53 |
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import os, errno, stat import encoding import util from i18n import _ def _lowerclean(s): return encoding.hfsignoreclean(s.lower()) class pathauditor(object): '''ensure that a filesystem path contains no banned components. the following properties of a path are checked: - ends with a directory separator - under top-level .hg - starts at the root of a windows drive - contains ".." - traverses a symlink (e.g. a/symlink_here/b) - inside a nested repository (a callback can be used to approve some nested repositories, e.g., subrepositories) ''' def __init__(self, root, callback=None): self.audited = set() self.auditeddir = set() self.root = root self.callback = callback if os.path.lexists(root) and not util.checkcase(root): self.normcase = util.normcase else: self.normcase = lambda x: x def __call__(self, path): '''Check the relative path. path may contain a pattern (e.g. foodir/**.txt)''' path = util.localpath(path) normpath = self.normcase(path) if normpath in self.audited: return # AIX ignores "/" at end of path, others raise EISDIR. if util.endswithsep(path): raise util.Abort(_("path ends in directory separator: %s") % path) parts = util.splitpath(path) if (os.path.splitdrive(path)[0] or _lowerclean(parts[0]) in ('.hg', '.hg.', '') or os.pardir in parts): raise util.Abort(_("path contains illegal component: %s") % path) # Windows shortname aliases for p in parts: if "~" in p: first, last = p.split("~", 1) if last.isdigit() and first.upper() in ["HG", "HG8B6C"]: raise util.Abort(_("path contains illegal component: %s") % path) if '.hg' in _lowerclean(path): lparts = [_lowerclean(p.lower()) for p in parts] for p in '.hg', '.hg.': if p in lparts[1:]: pos = lparts.index(p) base = os.path.join(*parts[:pos]) raise util.Abort(_("path '%s' is inside nested repo %r") % (path, base)) normparts = util.splitpath(normpath) assert len(parts) == len(normparts) parts.pop() normparts.pop() prefixes = [] while parts: prefix = os.sep.join(parts) normprefix = os.sep.join(normparts) if normprefix in self.auditeddir: break curpath = os.path.join(self.root, prefix) try: st = os.lstat(curpath) except OSError, err: # EINVAL can be raised as invalid path syntax under win32. # They must be ignored for patterns can be checked too. if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL): raise else: if stat.S_ISLNK(st.st_mode): raise util.Abort( _('path %r traverses symbolic link %r') % (path, prefix)) elif (stat.S_ISDIR(st.st_mode) and os.path.isdir(os.path.join(curpath, '.hg'))): if not self.callback or not self.callback(curpath): raise util.Abort(_("path '%s' is inside nested " "repo %r") % (path, prefix)) prefixes.append(normprefix) parts.pop() normparts.pop() self.audited.add(normpath) # only add prefixes to the cache after checking everything: we don't # want to add "foo/bar/baz" before checking if there's a "foo/.hg" self.auditeddir.update(prefixes) def check(self, path): try: self(path) return True except (OSError, util.Abort): return False def canonpath(root, cwd, myname, auditor=None): '''return the canonical path of myname, given cwd and root''' if util.endswithsep(root): rootsep = root else: rootsep = root + os.sep name = myname if not os.path.isabs(name): name = os.path.join(root, cwd, name) name = os.path.normpath(name) if auditor is None: auditor = pathauditor(root) if name != rootsep and name.startswith(rootsep): name = name[len(rootsep):] auditor(name) return util.pconvert(name) elif name == root: return '' else: # Determine whether `name' is in the hierarchy at or beneath `root', # by iterating name=dirname(name) until that causes no change (can't # check name == '/', because that doesn't work on windows). The list # `rel' holds the reversed list of components making up the relative # file name we want. rel = [] while True: try: s = util.samefile(name, root) except OSError: s = False if s: if not rel: # name was actually the same as root (maybe a symlink) return '' rel.reverse() name = os.path.join(*rel) auditor(name) return util.pconvert(name) dirname, basename = util.split(name) rel.append(basename) if dirname == name: break name = dirname raise util.Abort(_("%s not under root '%s'") % (myname, root)) def normasprefix(path): '''normalize the specified path as path prefix Returned value can be used safely for "p.startswith(prefix)", "p[len(prefix):]", and so on. For efficiency, this expects "path" argument to be already normalized by "os.path.normpath", "os.path.realpath", and so on. See also issue3033 for detail about need of this function. >>> normasprefix('/foo/bar').replace(os.sep, '/') '/foo/bar/' >>> normasprefix('/').replace(os.sep, '/') '/' ''' d, p = os.path.splitdrive(path) if len(p) != len(os.sep): return path + os.sep else: return path