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"""
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 ""')
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