# hook.py - hook support for mercurial## Copyright 2007 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. from i18n import _import os, sysimport extensions, util def _pythonhook(ui, repo, name, hname, funcname, args, throw):    '''call python hook. hook is callable object, looked up as    name in python module. if callable returns "true", hook    fails, else passes. if hook raises exception, treated as    hook failure. exception propagates if throw is "true".     reason for "true" meaning "hook failed" is so that    unmodified commands (e.g. mercurial.commands.update) can    be run as hooks without wrappers to convert return values.'''     ui.note(_("calling hook %s: %s\n") % (hname, funcname))    obj = funcname    if not hasattr(obj, '__call__'):        d = funcname.rfind('.')        if d == -1:            raise util.Abort(_('%s hook is invalid ("%s" not in '                               'a module)') % (hname, funcname))        modname = funcname[:d]        oldpaths = sys.path[:]        if hasattr(sys, "frozen"):            # binary installs require sys.path manipulation            path, name = os.path.split(modname)            if path and name:                sys.path.append(path)                modname = name        try:            obj = __import__(modname)        except ImportError:            try:                # extensions are loaded with hgext_ prefix                obj = __import__("hgext_%s" % modname)            except ImportError:                raise util.Abort(_('%s hook is invalid '                                   '(import of "%s" failed)') %                                 (hname, modname))        sys.path = oldpaths        try:            for p in funcname.split('.')[1:]:                obj = getattr(obj, p)        except AttributeError:            raise util.Abort(_('%s hook is invalid '                               '("%s" is not defined)') %                             (hname, funcname))        if not hasattr(obj, '__call__'):            raise util.Abort(_('%s hook is invalid '                               '("%s" is not callable)') %                             (hname, funcname))    try:        r = obj(ui=ui, repo=repo, hooktype=name, **args)    except KeyboardInterrupt:        raise    except Exception, exc:        if isinstance(exc, util.Abort):            ui.warn(_('error: %s hook failed: %s\n') %                         (hname, exc.args[0]))        else:            ui.warn(_('error: %s hook raised an exception: '                           '%s\n') % (hname, exc))        if throw:            raise        ui.traceback()        return True    if r:        if throw:            raise util.Abort(_('%s hook failed') % hname)        ui.warn(_('warning: %s hook failed\n') % hname)    return r def _exthook(ui, repo, name, cmd, args, throw):    ui.note(_("running hook %s: %s\n") % (name, cmd))     env = {}    for k, v in args.iteritems():        if hasattr(v, '__call__'):            v = v()        env['HG_' + k.upper()] = v     if repo:        cwd = repo.root    else:        cwd = os.getcwd()    r = util.system(cmd, environ=env, cwd=cwd)    if r:        desc, r = util.explain_exit(r)        if throw:            raise util.Abort(_('%s hook %s') % (name, desc))        ui.warn(_('warning: %s hook %s\n') % (name, desc))    return r _redirect = Falsedef redirect(state):    global _redirect    _redirect = state def hook(ui, repo, name, throw=False, **args):    r = False     if _redirect:        # temporarily redirect stdout to stderr        oldstdout = os.dup(sys.__stdout__.fileno())        os.dup2(sys.__stderr__.fileno(), sys.__stdout__.fileno())     try:        for hname, cmd in ui.configitems('hooks'):            if hname.split('.')[0] != name or not cmd:                continue            if hasattr(cmd, '__call__'):                r = _pythonhook(ui, repo, name, hname, cmd, args, throw) or r            elif cmd.startswith('python:'):                if cmd.count(':') >= 2:                    path, cmd = cmd[7:].rsplit(':', 1)                    mod = extensions.loadpath(path, 'hghook.%s' % hname)                    hookfn = getattr(mod, cmd)                else:                    hookfn = cmd[7:].strip()                r = _pythonhook(ui, repo, name, hname, hookfn, args, throw) or r            else:                r = _exthook(ui, repo, hname, cmd, args, throw) or r    finally:        if _redirect:            os.dup2(oldstdout, sys.__stdout__.fileno())            os.close(oldstdout)     return r