-#!/usr/bin/env python
+"""
+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
-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',
- '--short=10',
- 'HEAD',
- ], stderr=open(os.devnull, 'w'))
-except subprocess.CalledProcessError as e:
- # don't print anything if git fails
- pass
+
+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:
- sys.stdout.write('#define MESA_GIT_SHA1 "git-%s"\n' % git_sha1.rstrip())
+ write_if_different('#define MESA_GIT_SHA1 ""')