sync: Do a git pull with --use-superproject if superproject tree already exists.

Tested the code with the following commands.

$ ./run_tests -v tests/test_git_superproject.py
$ ./run_tests -v

Tested the sync code by copying all the repo changes into my Android
AOSP checkout and doing a repo sync --use-superproject twice.

.../WORKING_DIRECTORY$ repo sync --use-superproject

Bug: https://crbug.com/gerrit/13709
Bug: https://crbug.com/gerrit/13707
Tested-by: Raman Tenneti <rtenneti@google.com>
Change-Id: I7e4b1e51ca1d18b836a5fa8d139a0765262ba500

1 files changed, 1 insertions, 1 deletions

diff --git a/git_superproject.py b/git_superproject.py
index e2045cfd..157a1fbb 100644
--- a/git_superproject.py
+++ b/git_superproject.py
@@ -63,7 +63,7 @@ class Superproject(object):
       True if 'git clone <url> <branch>' is successful, or False.
     """
     os.mkdir(self._superproject_path)
-    cmd = ['clone', url, '--filter', 'blob:none']
+    cmd = ['clone', url, '--depth', '1']
     if branch:
       cmd += ['--branch', branch]
     p = GitCommand(None,