Teach new infrastructure to diff two trees

Nothing uses this yet, but "stg edit" will soon.

Signed-off-by: Karl Hasselström <kha@treskal.com>

diff --git a/stgit/lib/git.py b/stgit/lib/git.py
index 45879df69664069488d57af7c9d68f228cf1e3af..d75f724c55f1b7b6cc9771f4e96cdfba03d2454a 100644 (file)
--- a/stgit/lib/git.py
+++ b/stgit/lib/git.py
@@ -356,6 +356,11 @@ class Repository(RunWithEnv):
                 return None
         finally:
             index.delete()
+    def diff_tree(self, t1, t2, diff_opts):
+        assert isinstance(t1, Tree)
+        assert isinstance(t2, Tree)
+        return self.run(['git', 'diff-tree', '-p'] + list(diff_opts)
+                        + [t1.sha1, t2.sha1]).raw_output()
 
 class MergeException(exception.StgException):
     pass