inotify: Do not raise TypeError when client.query returns None

When something went wrong in client.query, it returns None.
If inotify.debug=True, we will attempt in this case a zip(A, None, B), which
would raise a TypeError.

hgext/inotify/__init__.py

@@ -1,125 +1,125 b''
 # __init__.py - inotify-based status acceleration for Linux
 #
 # Copyright 2006, 2007, 2008 Bryan O'Sullivan <[e-mail]>
 # Copyright 2007, 2008 Brendan Cully <[e-mail]>
 #
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
 '''inotify-based status acceleration for Linux systems
 '''
 
 # todo: socket permissions
 
 from mercurial.i18n import _
 from mercurial import cmdutil, util
 import client, errno, os, server, socket
 from weakref import proxy
 
 def serve(ui, repo, **opts):
     '''start an inotify server for this repository'''
     timeout = opts.get('timeout')
     if timeout:
         timeout = float(timeout) * 1e3
 
     class service:
         def init(self):
             try:
                 self.master = server.Master(ui, repo, timeout)
             except server.AlreadyStartedException, inst:
                 raise util.Abort(str(inst))
 
         def run(self):
             try:
                 self.master.run()
             finally:
                 self.master.shutdown()
 
     service = service()
     cmdutil.service(opts, initfn=service.init, runfn=service.run)
 
 def reposetup(ui, repo):
     if not hasattr(repo, 'dirstate'):
         return
 
     # XXX: weakref until hg stops relying on __del__
     repo = proxy(repo)
 
     class inotifydirstate(repo.dirstate.__class__):
         # Set to True if we're the inotify server, so we don't attempt
         # to recurse.
         inotifyserver = False
 
         def status(self, match, ignored, clean, unknown=True):
             files = match.files()
             if '.' in files:
                 files = []
             try:
                 if not ignored and not self.inotifyserver:
                     result = client.query(ui, repo, files, match, False,
                                           clean, unknown)
-                    if ui.config('inotify', 'debug'):
+                    if result and ui.config('inotify', 'debug'):
                         r2 = super(inotifydirstate, self).status(
                             match, False, clean, unknown)
                         for c,a,b in zip('LMARDUIC', result, r2):
                             for f in a:
                                 if f not in b:
                                     ui.warn('*** inotify: %s +%s\n' % (c, f))
                             for f in b:
                                 if f not in a:
                                     ui.warn('*** inotify: %s -%s\n' % (c, f))
                         result = r2
 
                     if result is not None:
                         return result
             except (OSError, socket.error), err:
                 autostart = ui.configbool('inotify', 'autostart', True)
 
                 if err[0] == errno.ECONNREFUSED:
                     ui.warn(_('(found dead inotify server socket; '
                                    'removing it)\n'))
                     os.unlink(repo.join('inotify.sock'))
                 if err[0] in (errno.ECONNREFUSED, errno.ENOENT) and autostart:
                     ui.debug(_('(starting inotify server)\n'))
                     try:
                         try:
                             server.start(ui, repo)
                         except server.AlreadyStartedException, inst:
                             # another process may have started its own
                             # inotify server while this one was starting.
                             ui.debug(str(inst))
                     except Exception, inst:
                         ui.warn(_('could not start inotify server: '
                                        '%s\n') % inst)
                     else:
                         # server is started, send query again
                         try:
                             return client.query(ui, repo, files, match,
                                          ignored, clean, unknown)
                         except socket.error, err:
                             ui.warn(_('could not talk to new inotify '
                                            'server: %s\n') % err[-1])
                 elif err[0] in (errno.ECONNREFUSED, errno.ENOENT):
                     # silently ignore normal errors if autostart is False
                     ui.debug(_('(inotify server not running)\n'))
                 else:
                     ui.warn(_('failed to contact inotify server: %s\n')
                              % err[-1])
                 ui.print_exc()
                 # replace by old status function
                 self.status = super(inotifydirstate, self).status
 
             return super(inotifydirstate, self).status(
                 match, ignored, clean, unknown)
 
     repo.dirstate.__class__ = inotifydirstate
 
 cmdtable = {
     '^inserve':
     (serve,
      [('d', 'daemon', None, _('run server in background')),
       ('', 'daemon-pipefds', '', _('used internally by daemon mode')),
       ('t', 'idle-timeout', '', _('minutes to sit idle before exiting')),
       ('', 'pid-file', '', _('name of file to write process ID to'))],
      _('hg inserve [OPT]...')),
     }