Only attempt to verify heads hg has, too

In the git repo there may be any number branches that are not hg
imported branches, so it doesn't make sense to print warnings when a
non-hg head isn't at what it was last time.

Now we get a list of branchtags hg has and only verify these.

Signed-off-by: Rocco Rutte <pdmef@gmx.net>

hg2git.py

@@ -57,11 +57,12 @@ def fixup_user(user,authors):
     name=m2.group(1)
   return '%s %s' % (name,mail)
 
+def get_branch(name):
+  if name=='HEAD':
+    name=cfg_master
+  return name
+
 def get_changeset(ui,repo,revision,authors):
-  def get_branch(name):
-    if name=='HEAD':
-      name=cfg_master
-    return name
   node=repo.lookup(revision)
   (manifest,user,(time,timezone),files,desc,extra)=repo.changelog.read(node)
   tz="%+03d%02d" % (-timezone / 3600, ((-timezone % 3600) / 60))
@@ -290,7 +291,13 @@ def verify_heads(ui,repo,cache):
     f.close()
     return sha1
 
-  for b in cache.keys():
+  # get list of hg's branches to verify, don't take all git has
+  branches=repo.branchtags()
+  l=[(-repo.changelog.rev(n), n, t) for t, n in branches.items()]
+  l.sort()
+
+  for _,_,b in l:
+    b=get_branch(b)
     sys.stderr.write('Verifying branch [%s]\n' % b)
     sha1=getsha1(b)
     c=cache.get(b)