mercurial/pathutil.py
author Laurent Charignon <lcharignon@fb.com>
Thu, 21 May 2015 14:34:24 -0700
changeset 25259 5b05f10c5024
parent 25022 10bbdcd89164
child 25281 660b178f49c7
permissions -rw-r--r--
revert: fix edition of newly added file during --interactive Before this patch: editing hunks of newly added file when performing a revert --interactive had no effect: the edits were discarded. After this patch, the edits are taken into account.
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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import os, errno, stat
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import encoding
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import util
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from i18n import _
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def _lowerclean(s):
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    return encoding.hfsignoreclean(s.lower())
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class pathauditor(object):
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    '''ensure that a filesystem path contains no banned components.
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    the following properties of a path are checked:
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    - ends with a directory separator
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    - under top-level .hg
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    - starts at the root of a windows drive
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    - contains ".."
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    - traverses a symlink (e.g. a/symlink_here/b)
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    - inside a nested repository (a callback can be used to approve
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      some nested repositories, e.g., subrepositories)
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    '''
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    def __init__(self, root, callback=None):
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        self.audited = set()
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        self.auditeddir = set()
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        self.root = root
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        self.callback = callback
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        if os.path.lexists(root) and not util.checkcase(root):
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            self.normcase = util.normcase
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        else:
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            self.normcase = lambda x: x
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    def __call__(self, path):
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        '''Check the relative path.
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        path may contain a pattern (e.g. foodir/**.txt)'''
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        path = util.localpath(path)
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        normpath = self.normcase(path)
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        if normpath in self.audited:
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            return
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        # AIX ignores "/" at end of path, others raise EISDIR.
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        if util.endswithsep(path):
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            raise util.Abort(_("path ends in directory separator: %s") % path)
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        parts = util.splitpath(path)
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        if (os.path.splitdrive(path)[0]
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            or _lowerclean(parts[0]) in ('.hg', '.hg.', '')
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            or os.pardir in parts):
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            raise util.Abort(_("path contains illegal component: %s") % path)
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        # Windows shortname aliases
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        for p in parts:
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            if "~" in p:
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                first, last = p.split("~", 1)
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                if last.isdigit() and first.upper() in ["HG", "HG8B6C"]:
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                    raise util.Abort(_("path contains illegal component: %s")
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                                     % path)
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        if '.hg' in _lowerclean(path):
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            lparts = [_lowerclean(p.lower()) for p in parts]
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            for p in '.hg', '.hg.':
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                if p in lparts[1:]:
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                    pos = lparts.index(p)
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                    base = os.path.join(*parts[:pos])
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                    raise util.Abort(_("path '%s' is inside nested repo %r")
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                                     % (path, base))
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        normparts = util.splitpath(normpath)
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        assert len(parts) == len(normparts)
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        parts.pop()
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        normparts.pop()
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        prefixes = []
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        while parts:
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            prefix = os.sep.join(parts)
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            normprefix = os.sep.join(normparts)
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            if normprefix in self.auditeddir:
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                break
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            curpath = os.path.join(self.root, prefix)
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            try:
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                st = os.lstat(curpath)
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            except OSError, err:
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                # EINVAL can be raised as invalid path syntax under win32.
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                # They must be ignored for patterns can be checked too.
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                if err.errno not in (errno.ENOENT, errno.ENOTDIR, errno.EINVAL):
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                    raise
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            else:
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                if stat.S_ISLNK(st.st_mode):
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                    raise util.Abort(
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                        _('path %r traverses symbolic link %r')
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                        % (path, prefix))
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                elif (stat.S_ISDIR(st.st_mode) and
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                      os.path.isdir(os.path.join(curpath, '.hg'))):
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                    if not self.callback or not self.callback(curpath):
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                        raise util.Abort(_("path '%s' is inside nested "
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                                           "repo %r")
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                                         % (path, prefix))
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            prefixes.append(normprefix)
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            parts.pop()
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            normparts.pop()
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        self.audited.add(normpath)
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        # only add prefixes to the cache after checking everything: we don't
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        # want to add "foo/bar/baz" before checking if there's a "foo/.hg"
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        self.auditeddir.update(prefixes)
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    def check(self, path):
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        try:
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            self(path)
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            return True
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        except (OSError, util.Abort):
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            return False
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def canonpath(root, cwd, myname, auditor=None):
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    '''return the canonical path of myname, given cwd and root'''
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    if util.endswithsep(root):
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        rootsep = root
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    else:
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        rootsep = root + os.sep
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    name = myname
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    if not os.path.isabs(name):
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        name = os.path.join(root, cwd, name)
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    name = os.path.normpath(name)
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    if auditor is None:
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        auditor = pathauditor(root)
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    if name != rootsep and name.startswith(rootsep):
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        name = name[len(rootsep):]
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        auditor(name)
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        return util.pconvert(name)
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    elif name == root:
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        return ''
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    else:
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        # Determine whether `name' is in the hierarchy at or beneath `root',
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        # by iterating name=dirname(name) until that causes no change (can't
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        # check name == '/', because that doesn't work on windows). The list
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        # `rel' holds the reversed list of components making up the relative
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        # file name we want.
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        rel = []
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        while True:
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            try:
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                s = util.samefile(name, root)
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            except OSError:
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                s = False
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            if s:
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                if not rel:
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                    # name was actually the same as root (maybe a symlink)
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                    return ''
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                rel.reverse()
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                name = os.path.join(*rel)
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                auditor(name)
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                return util.pconvert(name)
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            dirname, basename = util.split(name)
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            rel.append(basename)
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            if dirname == name:
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                break
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            name = dirname
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        # A common mistake is to use -R, but specify a file relative to the repo
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        # instead of cwd.  Detect that case, and provide a hint to the user.
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        hint = None
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        try:
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            if cwd != root:
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                canonpath(root, root, myname, auditor)
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                hint = (_("consider using '--cwd %s'")
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                        % os.path.relpath(root, cwd))
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        except util.Abort:
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            pass
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        raise util.Abort(_("%s not under root '%s'") % (myname, root),
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                         hint=hint)
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def normasprefix(path):
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    '''normalize the specified path as path prefix
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    Returned value can be used safely for "p.startswith(prefix)",
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    "p[len(prefix):]", and so on.
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    For efficiency, this expects "path" argument to be already
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    normalized by "os.path.normpath", "os.path.realpath", and so on.
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    See also issue3033 for detail about need of this function.
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    >>> normasprefix('/foo/bar').replace(os.sep, '/')
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    '/foo/bar/'
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    >>> normasprefix('/').replace(os.sep, '/')
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    '/'
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    '''
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    d, p = os.path.splitdrive(path)
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    if len(p) != len(os.sep):
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        return path + os.sep
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    else:
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        return path