patman: Add all CC addresses to the cover letter

If we're sending a cover letter make sure to CC everyone that we're
CCing on each of the individual patches.

Signed-off-by: Doug Anderson <dianders@chromium.org>

tools/patman/README

@@ -226,6 +226,9 @@ Date:	Mon Nov 7 23:18:44 2011 -0500
 will create a patch which is copied to x86, arm, sandbox, mikef, ag and
 afleming.
 
+If you have a cover letter it will get sent to the union of the CC lists of
+all of the other patches.
+
 
 Example Work Flow
 =================

tools/patman/patman.py

@@ -140,7 +140,7 @@ else:
             options.count + options.start):
         ok = False
 
-    cc_file = series.MakeCcFile(options.process_tags)
+    cc_file = series.MakeCcFile(options.process_tags, cover_fname)
 
     # Email the patches out (giving the user time to check / cancel)
     cmd = ''

tools/patman/series.py

@@ -19,6 +19,7 @@
 # MA 02111-1307 USA
 #
 
+import itertools
 import os
 
 import gitutil
@@ -138,6 +139,9 @@ class Series(dict):
         print 'Prefix:\t ', self.get('prefix')
         if self.cover:
             print 'Cover: %d lines' % len(self.cover)
+            all_ccs = itertools.chain(*self._generated_cc.values())
+            for email in set(all_ccs):
+                    print '      Cc: ',email
         if cmd:
             print 'Git command: %s' % cmd
 
@@ -201,27 +205,33 @@ class Series(dict):
             str = 'Change log exists, but no version is set'
             print col.Color(col.RED, str)
 
-    def MakeCcFile(self, process_tags):
+    def MakeCcFile(self, process_tags, cover_fname):
         """Make a cc file for us to use for per-commit Cc automation
 
         Also stores in self._generated_cc to make ShowActions() faster.
 
         Args:
             process_tags: Process tags as if they were aliases
+            cover_fname: If non-None the name of the cover letter.
         Return:
             Filename of temp file created
         """
         # Look for commit tags (of the form 'xxx:' at the start of the subject)
         fname = '/tmp/patman.%d' % os.getpid()
         fd = open(fname, 'w')
+        all_ccs = []
         for commit in self.commits:
             list = []
             if process_tags:
                 list += gitutil.BuildEmailList(commit.tags)
             list += gitutil.BuildEmailList(commit.cc_list)
+            all_ccs += list
             print >>fd, commit.patch, ', '.join(list)
             self._generated_cc[commit.patch] = list
 
+        if cover_fname:
+            print >>fd, cover_fname, ', '.join(set(all_ccs))
+
         fd.close()
         return fname