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# hook.py - hook support for mercurial
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#
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# Copyright 2007 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import os
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import sys
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import time
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from .i18n import _
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from . import (
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demandimport,
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error,
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extensions,
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util,
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)
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def _pythonhook(ui, repo, name, hname, funcname, args, throw):
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'''call python hook. hook is callable object, looked up as
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name in python module. if callable returns "true", hook
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fails, else passes. if hook raises exception, treated as
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hook failure. exception propagates if throw is "true".
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reason for "true" meaning "hook failed" is so that
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unmodified commands (e.g. mercurial.commands.update) can
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be run as hooks without wrappers to convert return values.'''
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if callable(funcname):
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obj = funcname
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funcname = obj.__module__ + "." + obj.__name__
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else:
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d = funcname.rfind('.')
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if d == -1:
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raise error.HookLoadError(
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_('%s hook is invalid ("%s" not in a module)')
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% (hname, funcname))
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modname = funcname[:d]
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oldpaths = sys.path
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if util.mainfrozen():
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# binary installs require sys.path manipulation
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modpath, modfile = os.path.split(modname)
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if modpath and modfile:
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sys.path = sys.path[:] + [modpath]
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modname = modfile
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with demandimport.deactivated():
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try:
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obj = __import__(modname)
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except ImportError:
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e1 = sys.exc_info()
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try:
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# extensions are loaded with hgext_ prefix
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obj = __import__("hgext_%s" % modname)
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except ImportError:
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e2 = sys.exc_info()
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if ui.tracebackflag:
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ui.warn(_('exception from first failed import '
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'attempt:\n'))
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ui.traceback(e1)
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if ui.tracebackflag:
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ui.warn(_('exception from second failed import '
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'attempt:\n'))
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ui.traceback(e2)
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if not ui.tracebackflag:
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tracebackhint = _(
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'run with --traceback for stack trace')
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else:
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tracebackhint = None
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raise error.HookLoadError(
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_('%s hook is invalid: import of "%s" failed') %
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(hname, modname), hint=tracebackhint)
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sys.path = oldpaths
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try:
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for p in funcname.split('.')[1:]:
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obj = getattr(obj, p)
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except AttributeError:
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raise error.HookLoadError(
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_('%s hook is invalid: "%s" is not defined')
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% (hname, funcname))
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if not callable(obj):
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raise error.HookLoadError(
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_('%s hook is invalid: "%s" is not callable')
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% (hname, funcname))
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ui.note(_("calling hook %s: %s\n") % (hname, funcname))
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starttime = time.time()
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try:
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# redirect IO descriptors to the ui descriptors so hooks
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# that write directly to these don't mess up the command
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# protocol when running through the command server
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old = sys.stdout, sys.stderr, sys.stdin
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sys.stdout, sys.stderr, sys.stdin = ui.fout, ui.ferr, ui.fin
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r = obj(ui=ui, repo=repo, hooktype=name, **args)
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except Exception as exc:
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if isinstance(exc, error.Abort):
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ui.warn(_('error: %s hook failed: %s\n') %
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(hname, exc.args[0]))
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else:
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ui.warn(_('error: %s hook raised an exception: '
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'%s\n') % (hname, exc))
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if throw:
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raise
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ui.traceback()
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return True, True
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finally:
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sys.stdout, sys.stderr, sys.stdin = old
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duration = time.time() - starttime
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ui.log('pythonhook', 'pythonhook-%s: %s finished in %0.2f seconds\n',
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name, funcname, duration)
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if r:
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if throw:
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raise error.HookAbort(_('%s hook failed') % hname)
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ui.warn(_('warning: %s hook failed\n') % hname)
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return r, False
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def _exthook(ui, repo, name, cmd, args, throw):
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ui.note(_("running hook %s: %s\n") % (name, cmd))
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starttime = time.time()
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env = {}
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# make in-memory changes visible to external process
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if repo is not None:
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tr = repo.currenttransaction()
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repo.dirstate.write(tr)
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if tr and tr.writepending():
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env['HG_PENDING'] = repo.root
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for k, v in args.iteritems():
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if callable(v):
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v = v()
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if isinstance(v, dict):
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# make the dictionary element order stable across Python
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# implementations
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v = ('{' +
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', '.join('%r: %r' % i for i in sorted(v.iteritems())) +
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'}')
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env['HG_' + k.upper()] = v
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if repo:
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cwd = repo.root
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else:
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cwd = os.getcwd()
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r = ui.system(cmd, environ=env, cwd=cwd)
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duration = time.time() - starttime
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ui.log('exthook', 'exthook-%s: %s finished in %0.2f seconds\n',
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name, cmd, duration)
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if r:
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desc, r = util.explainexit(r)
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if throw:
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raise error.HookAbort(_('%s hook %s') % (name, desc))
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ui.warn(_('warning: %s hook %s\n') % (name, desc))
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return r
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def _allhooks(ui):
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hooks = []
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for name, cmd in ui.configitems('hooks'):
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if not name.startswith('priority'):
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priority = ui.configint('hooks', 'priority.%s' % name, 0)
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hooks.append((-priority, len(hooks), name, cmd))
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return [(k, v) for p, o, k, v in sorted(hooks)]
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_redirect = False
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def redirect(state):
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global _redirect
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_redirect = state
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def hook(ui, repo, name, throw=False, **args):
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if not ui.callhooks:
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return False
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hooks = []
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for hname, cmd in _allhooks(ui):
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if hname.split('.')[0] == name and cmd:
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hooks.append((hname, cmd))
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res = runhooks(ui, repo, name, hooks, throw=throw, **args)
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r = False
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for hname, cmd in hooks:
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r = res[hname][0] or r
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return r
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def runhooks(ui, repo, name, hooks, throw=False, **args):
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res = {}
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oldstdout = -1
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try:
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for hname, cmd in hooks:
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if oldstdout == -1 and _redirect:
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try:
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stdoutno = sys.__stdout__.fileno()
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stderrno = sys.__stderr__.fileno()
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# temporarily redirect stdout to stderr, if possible
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if stdoutno >= 0 and stderrno >= 0:
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sys.__stdout__.flush()
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oldstdout = os.dup(stdoutno)
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os.dup2(stderrno, stdoutno)
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except (OSError, AttributeError):
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# files seem to be bogus, give up on redirecting (WSGI, etc)
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pass
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if callable(cmd):
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r, raised = _pythonhook(ui, repo, name, hname, cmd, args, throw)
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elif cmd.startswith('python:'):
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if cmd.count(':') >= 2:
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path, cmd = cmd[7:].rsplit(':', 1)
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path = util.expandpath(path)
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if repo:
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path = os.path.join(repo.root, path)
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try:
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mod = extensions.loadpath(path, 'hghook.%s' % hname)
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except Exception:
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ui.write(_("loading %s hook failed:\n") % hname)
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raise
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hookfn = getattr(mod, cmd)
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else:
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hookfn = cmd[7:].strip()
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r, raised = _pythonhook(ui, repo, name, hname, hookfn, args,
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throw)
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else:
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r = _exthook(ui, repo, hname, cmd, args, throw)
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raised = False
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res[hname] = r, raised
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# The stderr is fully buffered on Windows when connected to a pipe.
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# A forcible flush is required to make small stderr data in the
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# remote side available to the client immediately.
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sys.stderr.flush()
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finally:
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if _redirect and oldstdout >= 0:
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os.dup2(oldstdout, stdoutno)
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os.close(oldstdout)
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return res
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