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Viewing changes to bzrlib/lockdir.py

  • Committer: Jelmer Vernooij
  • Date: 2010-12-20 11:57:14 UTC
  • mto: This revision was merged to the branch mainline in revision 5577.
  • Revision ID: jelmer@samba.org-20101220115714-2ru3hfappjweeg7q
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bzrlib/lockdir.py
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        LockBreakMismatch,
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        LockBroken,
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        LockContention,
 
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        LockCorrupt,
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        LockFailed,
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        LockNotHeld,
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        NoSuchFile,
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        This is a UI centric function: it uses the bzrlib.ui.ui_factory to
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        prompt for input if a lock is detected and there is any doubt about
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        it possibly being still active.
 
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        :returns: LockResult for the broken lock.
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        """
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        self._check_not_locked()
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        holder_info = self.peek()
 
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        try:
 
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            holder_info = self.peek()
 
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        except LockCorrupt, e:
 
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            # The lock info is corrupt.
 
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            if bzrlib.ui.ui_factory.get_boolean("Break (corrupt %r)" % (self,)):
 
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                self.force_break_corrupt(e.file_data)
 
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            return
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        if holder_info is not None:
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            lock_info = '\n'.join(self._format_lock_info(holder_info))
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            if bzrlib.ui.ui_factory.get_boolean("Break %s" % lock_info):
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                self.force_break(holder_info)
 
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            if bzrlib.ui.ui_factory.confirm_action(
 
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                "Break %(lock_info)s", 'bzrlib.lockdir.break', 
 
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                dict(lock_info=lock_info)):
 
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                result = self.force_break(holder_info)
 
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                bzrlib.ui.ui_factory.show_message(
 
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                    "Broke lock %s" % result.lock_url)
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    def force_break(self, dead_holder_info):
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        """Release a lock held by another process.
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        After the lock is broken it will not be held by any process.
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        It is possible that another process may sneak in and take the
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        lock before the breaking process acquires it.
 
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        :returns: LockResult for the broken lock.
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        """
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        if not isinstance(dead_holder_info, dict):
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            raise ValueError("dead_holder_info: %r" % dead_holder_info)
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                                 current_info.get('nonce'))
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        for hook in self.hooks['lock_broken']:
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            hook(result)
 
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        return result
 
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    def force_break_corrupt(self, corrupt_info_lines):
 
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        """Release a lock that has been corrupted.
 
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        This is very similar to force_break, it except it doesn't assume that
 
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        self.peek() can work.
 
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        :param corrupt_info_lines: the lines of the corrupted info file, used
 
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            to check that the lock hasn't changed between reading the (corrupt)
 
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            info file and calling force_break_corrupt.
 
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        """
 
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        # XXX: this copes with unparseable info files, but what about missing
 
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        # info files?  Or missing lock dirs?
 
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        self._check_not_locked()
 
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        tmpname = '%s/broken.%s.tmp' % (self.path, rand_chars(20))
 
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        self.transport.rename(self._held_dir, tmpname)
 
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        # check that we actually broke the right lock, not someone else;
 
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        # there's a small race window between checking it and doing the
 
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        # rename.
 
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        broken_info_path = tmpname + self.__INFO_NAME
 
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        f = self.transport.get(broken_info_path)
 
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        broken_lines = f.readlines()
 
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        if broken_lines != corrupt_info_lines:
 
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            raise LockBreakMismatch(self, broken_lines, corrupt_info_lines)
 
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        self.transport.delete(broken_info_path)
 
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        self.transport.rmdir(tmpname)
 
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        result = lock.LockResult(self.transport.abspath(self.path))
 
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        for hook in self.hooks['lock_broken']:
 
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            hook(result)
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    def _check_not_locked(self):
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        """If the lock is held by this instance, raise an error."""
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        return s.to_string()
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    def _parse_info(self, info_bytes):
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        stanza = rio.read_stanza(osutils.split_lines(info_bytes))
 
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        lines = osutils.split_lines(info_bytes)
 
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        try:
 
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            stanza = rio.read_stanza(lines)
 
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        except ValueError, e:
 
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            mutter('Corrupt lock info file: %r', lines)
 
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            raise LockCorrupt("could not parse lock info file: " + str(e),
 
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                              lines)
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        if stanza is None:
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            # see bug 185013; we fairly often end up with the info file being
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            # empty after an interruption; we could log a message here but