Fix up some type errors.

extras/git-hooks/post-receive

@@ -38,23 +38,23 @@ def revs_between(head, ancestors):
                 yield rev
 
     if not head.id in ancestors:
-        yield unicode(head.id)
+        yield head.id
 
 
 def gather_ancestors(commit, seen=None):
     """ Yield all ancestors commits of a given commit. """
 
     seen = seen or []
-    idx = unicode(commit.id)
+    idx = commit.id
 
     if not idx in seen:
         seen.append(idx)
 
         for parent in commit.parents:
-            for rev in gather_ancestors(parent, seen=seen):
-                yield rev.id
+            for revid in gather_ancestors(parent, seen=seen):
+                yield revid
 
-        yield commit.id
+        yield idx
 
 
 def build_stats(commit):
@@ -97,13 +97,13 @@ for line in lines:
 
     try:
         base = repo.revparse_single(base)
-        ancestors = gather_ancestors(base)
+        ancestors = list(gather_ancestors(base))
         revs = revs_between(head, ancestors)
     except KeyError:
-        revs = [unicode(head.id)]
+        revs = [head.id]
 
     def _build_commit(rev):
-        commit = repo.revparse_single(rev)
+        commit = repo.revparse_single(unicode(rev))
 
         # Tags are a little funny, and vary between versions of pygit2, so we'll
         # just ignore them as far as fedmsg is concerned.
@@ -122,7 +122,7 @@ for line in lines:
                 files=files,
                 total=total,
             ),
-            rev=rev,
+            rev=unicode(rev),
             path=abspath,
             repo=repo_name,
             branch=branch,