Raise an human readable exception if an unversioned directory exists.

gclient.py

 #!/usr/bin/python
 #
 # Copyright 2008 Google Inc.  All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #      http://www.apache.org/licenses/LICENSE-2.0
 #
@@ skipping 770 matching lines @@
     if not os.path.exists(checkout_path):
       # We need to checkout.
       command = ['checkout', url, checkout_path]
       if revision:
         command.extend(['--revision', str(revision)])
       RunSVNAndGetFileList(command, self._root_dir, file_list)
       return
 
     # Get the existing scm url and the revision number of the current checkout.
     from_info = CaptureSVNInfo(os.path.join(checkout_path, '.'), '.')
+    if not from_info:
+      raise Error("Can't update/checkout %s if an unversioned directory is "

[sgk, 2009/05/15 05:18:29]

Nit:  I prefer %r in messages like this so the string is quoted.  The error
message is more readable if something weird happens and the value is a null
string.

+                  "present. Delete the directory and try again." %
+                  checkout_path)
 
     if options.manually_grab_svn_rev:
       # Retrieve the current HEAD version because svn is slow at null updates.
       if not revision:
         from_info_live = CaptureSVNInfo(from_info['URL'], '.')
         revision = int(from_info_live['Revision'])
         rev_str = ' at %d' % revision
 
     if from_info['URL'] != components[0]:
       to_info = CaptureSVNInfo(url, '.')
@@ skipping 920 matching lines @@
 
 if "__main__" == __name__:
   try:
     result = Main(sys.argv)
   except Error, e:
     print >> sys.stderr, "Error: %s" % str(e)
     result = 1
   sys.exit(result)
 
 # vim: ts=2:sw=2:tw=80:et: