| """ |
| Generate the contents of the git_sha1.h file. |
| """ |
| |
| import argparse |
| import os |
| import os.path |
| import subprocess |
| import sys |
| |
| |
| def get_git_sha1(): |
| """Try to get the git SHA1 with git rev-parse.""" |
| git_dir = os.path.join(os.path.dirname(sys.argv[0]), '..', '.git') |
| try: |
| git_sha1 = subprocess.check_output([ |
| 'git', |
| '--git-dir=' + git_dir, |
| 'rev-parse', |
| 'HEAD', |
| ], stderr=open(os.devnull, 'w')).decode("ascii") |
| except Exception: |
| # don't print anything if it fails |
| git_sha1 = '' |
| return git_sha1 |
| |
| |
| def write_if_different(contents): |
| """ |
| Avoid touching the output file if it doesn't need modifications |
| Useful to avoid triggering rebuilds when nothing has changed. |
| """ |
| if os.path.isfile(args.output): |
| with open(args.output, 'r') as file: |
| if file.read() == contents: |
| return |
| with open(args.output, 'w') as file: |
| file.write(contents) |
| |
| |
| parser = argparse.ArgumentParser() |
| parser.add_argument('--output', help='File to write the #define in', |
| required=True) |
| args = parser.parse_args() |
| |
| git_sha1 = os.environ.get('MESA_GIT_SHA1_OVERRIDE', get_git_sha1())[:10] |
| if git_sha1: |
| write_if_different('#define MESA_GIT_SHA1 " (git-' + git_sha1 + ')"') |
| else: |
| write_if_different('#define MESA_GIT_SHA1 ""') |