| #!/usr/bin/env python3 | 
 | # Copyright (c) 2019, the R8 project authors. Please see the AUTHORS file | 
 | # for details. All rights reserved. Use of this source code is governed by a | 
 | # BSD-style license that can be found in the LICENSE file. | 
 |  | 
 | import utils | 
 | import subprocess | 
 |  | 
 |  | 
 | def GitClone(url, checkout_dir): | 
 |     cmd = ['git', 'clone', url, checkout_dir] | 
 |     utils.PrintCmd(cmd) | 
 |     return subprocess.check_call(cmd) | 
 |  | 
 |  | 
 | def GitCheckout(revision, checkout_dir): | 
 |     with utils.ChangedWorkingDirectory(checkout_dir): | 
 |         cmd = ['git', 'checkout', revision] | 
 |         utils.PrintCmd(cmd) | 
 |         return subprocess.check_call(cmd) | 
 |  | 
 |  | 
 | def GetHeadRevision(checkout_dir, use_main=False): | 
 |     revision_from = 'origin/main' if use_main else 'HEAD' | 
 |     cmd = ['git', 'rev-parse', revision_from] | 
 |     utils.PrintCmd(cmd) | 
 |     with utils.ChangedWorkingDirectory(checkout_dir): | 
 |         return subprocess.check_output(cmd).strip().decode('utf-8') |