""" Generate the contents of the git_sha1.h file. The output of this script goes to stdout. """ 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: # 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 ""')