Automatically disable progress for non tty output, i.e. when it's redirected.

gclient.py

 #!/usr/bin/python
 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Meta checkout manager supporting both Subversion and GIT.
 
 Files
   .gclient      : Current client configuration, written by 'config' command.
                   Format is a Python script defining 'solutions', a list whose
@@ skipping 697 matching lines @@
     """Runs a command on each dependency in a client and its dependencies.
 
     Args:
       command: The command to use (e.g., 'status' or 'diff')
       args: list of str - extra arguments to add to the command line.
     """
     if not self.dependencies:
       raise gclient_utils.Error('No solution specified')
     revision_overrides = self._EnforceRevisions()
     pm = None
-    if command == 'update' and not self._options.verbose:
+    # Disable progress for non-tty stdout.
+    if command in ('update', 'revert') and sys.stdout.isatty():
       pm = Progress('Syncing projects', 1)
     work_queue = gclient_utils.ExecutionQueue(self._options.jobs, pm)
     for s in self.dependencies:
       work_queue.enqueue(s)
     work_queue.flush(revision_overrides, command, args, options=self._options)
 
     # Once all the dependencies have been processed, it's now safe to run the
     # hooks.
     if not self._options.nohooks:
       self.RunHooksRecursively(self._options)
@@ skipping 499 matching lines @@
     return CMDhelp(parser, argv)
   except gclient_utils.Error, e:
     print >> sys.stderr, 'Error: %s' % str(e)
     return 1
 
 
 if '__main__' == __name__:
   sys.exit(Main(sys.argv[1:]))
 
 # vim: ts=2:sw=2:tw=80:et: