-#!/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
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:
- sys.stdout.write('#define MESA_GIT_SHA1 "git-%s"\n' % git_sha1.rstrip())
+ write_if_different('#define MESA_GIT_SHA1 " (git-' + git_sha1 + ')"')
+else:
+ write_if_different('#define MESA_GIT_SHA1 ""')