From b962a1f5e0daad323bdd66fad93f00a3738cc255 Mon Sep 17 00:00:00 2001
From: Anatol Pomazau <anatol@google.com>
Date: Thu, 29 Mar 2012 18:06:43 -0700
Subject: [PATCH] Check if SHA1 presents in repository

Previously repo had incorrect code that did not really check
if sha1 presents in a project. It worked for tags though.

Check if a revision (either tag or sha1) is present by using
'git rev_parse' functionality.

Change-Id: I1787f3348573948573948753987394839487572b
---
 project.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/project.py b/project.py
index b2eaa878..49fef2f7 100644
--- a/project.py
+++ b/project.py
@@ -1396,9 +1396,11 @@ class Project(object):
 
       if is_sha1 or tag_name is not None:
         try:
-          self.GetRevisionId()
+          # if revision (sha or tag) is not present then following function
+          # throws an error.
+          self.bare_git.rev_parse('--verify', '%s^0' % self.revisionExpr)
           return True
-        except ManifestInvalidRevisionError:
+        except GitError:
           # There is no such persistent revision. We have to fetch it.
           pass