From b4a4c1a772d80e7fd764ecea878cfa86c07edd7e Mon Sep 17 00:00:00 2001
From: Sam Thursfield <sam.thursfield@codethink.co.uk>
Date: Wed, 5 Nov 2014 15:01:57 +0000
Subject: Add GitDirectory.ref_exists() method

This allows checking if a ref exists without requiring the caller
to use a try:, except: block.
---
 morphlib/gitdir.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'morphlib/gitdir.py')

diff --git a/morphlib/gitdir.py b/morphlib/gitdir.py
index 9fef4f1e..fd7f3808 100644
--- a/morphlib/gitdir.py
+++ b/morphlib/gitdir.py
@@ -537,6 +537,13 @@ class GitDirectory(object):
     def resolve_ref_to_tree(self, ref):
         return self._rev_parse('%s^{tree}' % ref)
 
+    def ref_exists(self, ref):
+        try:
+            self._rev_parse('%s^{commit}' % ref)
+            return True
+        except InvalidRefError:
+            return False
+
     def _list_files_in_work_tree(self):
         for dirpath, subdirs, filenames in os.walk(self.dirname):
             if dirpath == self.dirname and '.git' in subdirs:
-- 
cgit v1.2.1