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73f0d55371
This solved an obscure bug for me. In upgrading Distribute on the server, a patch was added to has a try: import a except ImportError thing that's only supposed to work with Python 3.3. I'm using 2.7. My hook failed with an ImportError because of this. It seems kind of sensible to turn off demandimport before importing the hook, since the except ImportError pattern is used quite a bit in Python code (including in other Distribute code).
194 lines
7.2 KiB
Python
194 lines
7.2 KiB
Python
# 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 i18n import _
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import os, sys
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import extensions, util, demandimport
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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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ui.note(_("calling hook %s: %s\n") % (hname, funcname))
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obj = funcname
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if not util.safehasattr(obj, '__call__'):
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d = funcname.rfind('.')
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if d == -1:
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raise util.Abort(_('%s hook is invalid ("%s" not in '
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'a module)') % (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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try:
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demandimport.disable()
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obj = __import__(modname)
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demandimport.enable()
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except ImportError:
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e1 = sys.exc_type, sys.exc_value, sys.exc_traceback
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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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demandimport.enable()
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except ImportError:
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demandimport.enable()
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e2 = sys.exc_type, sys.exc_value, sys.exc_traceback
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if ui.tracebackflag:
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ui.warn(_('exception from first failed import 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 attempt:\n'))
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ui.traceback(e2)
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raise util.Abort(_('%s hook is invalid '
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'(import of "%s" failed)') %
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(hname, modname))
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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 util.Abort(_('%s hook is invalid '
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'("%s" is not defined)') %
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(hname, funcname))
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if not util.safehasattr(obj, '__call__'):
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raise util.Abort(_('%s hook is invalid '
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'("%s" is not callable)') %
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(hname, funcname))
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try:
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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 KeyboardInterrupt:
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raise
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except Exception, exc:
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if isinstance(exc, util.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
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finally:
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sys.stdout, sys.stderr, sys.stdin = old
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if r:
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if throw:
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raise util.Abort(_('%s hook failed') % hname)
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ui.warn(_('warning: %s hook failed\n') % hname)
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return r
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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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env = {}
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for k, v in args.iteritems():
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if util.safehasattr(v, '__call__'):
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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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if 'HG_URL' in env and env['HG_URL'].startswith('remote:http'):
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r = util.system(cmd, environ=env, cwd=cwd, out=ui)
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else:
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r = util.system(cmd, environ=env, cwd=cwd, out=ui.fout)
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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 util.Abort(_('%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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r = False
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oldstdout = -1
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try:
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for hname, cmd in _allhooks(ui):
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if hname.split('.')[0] != name or not cmd:
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continue
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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 util.safehasattr(cmd, '__call__'):
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r = _pythonhook(ui, repo, name, hname, cmd, args, throw) or r
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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 = _pythonhook(ui, repo, name, hname, hookfn, args, throw) or r
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else:
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r = _exthook(ui, repo, hname, cmd, args, throw) or r
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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 r
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