# error.py - Mercurial exceptions## Copyright 2005-2008 Matt Mackall <mpm@selenic.com>## This software may be used and distributed according to the terms of the# GNU General Public License version 2, incorporated herein by reference. """Mercurial exceptions. This allows us to catch exceptions at higher levels without forcingimports.""" # Do not import anything here, please class RevlogError(Exception):    pass class LookupError(RevlogError, KeyError):    def __init__(self, name, index, message):        self.name = name        if isinstance(name, str) and len(name) == 20:            from node import short            name = short(name)        RevlogError.__init__(self, '%s@%s: %s' % (index, name, message))     def __str__(self):        return RevlogError.__str__(self) class ParseError(Exception):    """Exception raised on errors in parsing the command line.""" class ConfigError(Exception):    'Exception raised when parsing config files' class RepoError(Exception):    pass class CapabilityError(RepoError):    pass class LockError(IOError):    def __init__(self, errno, strerror, filename, desc):        IOError.__init__(self, errno, strerror, filename)        self.desc = desc class LockHeld(LockError):    def __init__(self, errno, filename, desc, locker):        LockError.__init__(self, errno, 'Lock held', filename, desc)        self.locker = locker class LockUnavailable(LockError):    pass class ResponseError(Exception):    """Raised to print an error with part of output and exit.""" class UnknownCommand(Exception):    """Exception raised if command is not in the command table.""" class AmbiguousCommand(Exception):    """Exception raised if command shortcut matches more than one command.""" # derived from KeyboardInterrupt to simplify some breakout codeclass SignalInterrupt(KeyboardInterrupt):    """Exception raised on SIGTERM and SIGHUP.""" class SignatureError(Exception):    pass class Abort(Exception):    """Raised if a command needs to print an error and exit."""