inotify: set a flag so a failed inotify query doesn't get repeated.

If, for some reason, we can't get the inotify server to start, it's better to
disable inotify queries for the instance to avoid trying over and over to start
the server, which takes time. Just fall back on repo.status()

hgext/inotify/__init__.py

@@ -63,17 +63,24 b' def reposetup(ui, repo):'
         # to recurse.
         inotifyserver = False
 
+        # We'll set this to false after an unsuccessful attempt so that
+        # next calls of status() within the same instance don't try again
+        # to start an inotify server if it won't start.
+        _inotifyon = True
+
         def status(self, match, ignored, clean, unknown=True):
             files = match.files()
             if '.' in files:
                 files = []
-            if not ignored and not self.inotifyserver:
+            if self._inotifyon and not ignored and not self.inotifyserver:
                 cli = client(ui, repo)
                 try:
                     result = cli.statusquery(files, match, False,
                                             clean, unknown)
                 except QueryFailed, instr:
                     ui.debug(str(instr))
+                    # don't retry within the same hg instance
+                    inotifydirstate._inotifyon = False
                     pass
                 else:
                     if ui.config('inotify', 'debug'):