-#!/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
'rev-parse',
'HEAD',
], stderr=open(os.devnull, 'w')).decode("ascii")
- except:
+ 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)
git_sha1 = os.environ.get('MESA_GIT_SHA1_OVERRIDE', get_git_sha1())[:10]
if git_sha1:
- git_sha1_h_in_path = os.path.join(os.path.dirname(sys.argv[0]),
- '..', 'src', 'git_sha1.h.in')
- with open(git_sha1_h_in_path, 'r') as git_sha1_h_in:
- new_sha1 = git_sha1_h_in.read().replace('@VCS_TAG@', git_sha1)
- if os.path.isfile(args.output):
- with open(args.output, 'r') as git_sha1_h:
- if git_sha1_h.read() == new_sha1:
- quit()
- with open(args.output, 'w') as git_sha1_h:
- git_sha1_h.write(new_sha1)
+ write_if_different('#define MESA_GIT_SHA1 " (git-' + git_sha1 + ')"')
else:
- open(args.output, 'w').close()
+ write_if_different('#define MESA_GIT_SHA1 ""')