tree c3404890d8a533fe218b6d5a16ac60fc221a517e
parent 673acfc6bdff0e339e47a7f950a44580fa74a637
author Zhen Chen <czhen@google.com> 1500596455 -0700
committer Zhen Chen <czhen@google.com> 1501089157 -0700

Add commit check for head references

Make sure all refs/heads/* point to a commit object.

Change-Id: I9c7cf347aaf63d5ef604d520c2383c6cf3043890
Signed-off-by: Zhen Chen <czhen@google.com>