Warn when git cl upload might be overwriting a newer patchset.

git_cl.py

Index: git_cl.py
diff --git a/git_cl.py b/git_cl.py
index 2fd5d852f15d892dc6ae968fbd2ceee33cdb4666..7693dad34b42ebecdee2bddd317cfc5d4d7dd261 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -1285,6 +1285,15 @@ def CMDupload(parser, args):
     if not options.reviewers and hook_results.reviewers:
       options.reviewers = hook_results.reviewers
 
+  if cl.GetIssue():
+    latest_patchset = cl.GetMostRecentPatchset(cl.GetIssue())
+    local_patchset = cl.GetPatchset()
+    if local_patchset < latest_patchset:
+      print 'The last upload made from this repository was patchset #%d but ' \

[M-A Ruel, 2013/03/18 18:15:41]

Use () instead of \

[koz (OOO until 15th September), 2013/03/18 23:23:55]

Done.

+            'the most recent patchset on the server is #%d.' \
+            % (local_patchset, latest_patchset)
+      ask_for_data('About to upload; enter to confirm.')
+
   print_stats(options.similarity, options.find_copies, args)
   if settings.GetIsGerrit():
     return GerritUpload(options, args, cl)