Fix 'repo sync' when the remote reflog has only 1 entry
If the reflog for the upstream branch has only 1 entry in it, as
the branch has been updated only once, we can get back the 0{40}
object id from `git rev-parse upstream@{1}`, in which case we should
consider it to be the same as if upstream@{1} is not defined.
Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/project.py b/project.py
index 7c0c58f..df1e264 100644
--- a/project.py
+++ b/project.py
@@ -517,6 +517,9 @@
old_merge = self.bare_git.rev_parse('%s@{1}' % merge)
except GitError:
old_merge = merge
+ if old_merge == '0000000000000000000000000000000000000000' \
+ or old_merge == '':
+ old_merge = merge
else:
# The upstream switched on us. Time to cross our fingers
# and pray that the old upstream also wasn't in the habit
