Special-case preflight clean to allow for missing directories.

cros_mark_as_stable.py

 #!/usr/bin/python
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """This module uprevs a given package's ebuild to the next revision."""
 
 
 import fileinput
@@ skipping 478 matching lines @@
     else:
       command = argv[1]
   except gflags.FlagsError, e :
     _PrintUsageAndDie(str(e))
 
   package_list = gflags.FLAGS.packages.split(':')
   _CheckSaneArguments(package_list, command)
   if gflags.FLAGS.overlays:
     overlays = {}
     for path in gflags.FLAGS.overlays.split(':'):
-      if not os.path.isdir(path):
+      if command != 'clean' and not os.path.isdir(path):
         Die('Cannot find overlay: %s' % path)
       overlays[path] = []
   else:
     Warning('Missing --overlays argument')
     overlays = {
       '%s/private-overlays/chromeos-overlay' % gflags.FLAGS.srcroot: [],
       '%s/third_party/chromiumos-overlay' % gflags.FLAGS.srcroot: []
     }
 
   if command == 'commit':
@@ skipping 38 matching lines @@
           raise
 
       if revved_packages:
         _CleanStalePackages(gflags.FLAGS.board, revved_packages)
       else:
         work_branch.Delete()
 
 
 if __name__ == '__main__':
   main(sys.argv)