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#!/usr/bin/env python3
"""Gets the current revision and writes it to VCSRevision.h."""
from __future__ import print_function
import argparse
import os
import subprocess
import sys
THIS_DIR = os.path.abspath(os.path.dirname(__file__))
LLVM_DIR = os.path.dirname(os.path.dirname(os.path.dirname(THIS_DIR)))
def which(program):
# distutils.spawn.which() doesn't find .bat files,
# https://bugs.python.org/issue2200
for path in os.environ["PATH"].split(os.pathsep):
candidate = os.path.join(path, program)
if os.path.isfile(candidate) and os.access(candidate, os.X_OK):
return candidate
return None
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('-d', '--depfile',
help='if set, writes a depfile that causes this script '
'to re-run each time the current revision changes')
parser.add_argument('vcs_header', help='path to the output file to write')
args = parser.parse_args()
if os.path.isdir(os.path.join(LLVM_DIR, '.svn')):
print('SVN support not implemented', file=sys.stderr)
return 1
if os.path.exists(os.path.join(LLVM_DIR, '.git')):
print('non-mono-repo git support not implemented', file=sys.stderr)
return 1
git, use_shell = which('git'), False
if not git:
git = which('git.exe')
if not git:
git = which('git.bat')
use_shell = True
git_dir = subprocess.check_output([git, 'rev-parse', '--git-dir'],
cwd=LLVM_DIR, shell=use_shell).decode().strip()
if not os.path.isdir(git_dir):
print('.git dir not found at "%s"' % git_dir, file=sys.stderr)
return 1
rev = subprocess.check_output([git, 'rev-parse', '--short', 'HEAD'],
cwd=git_dir, shell=use_shell).decode().strip()
# FIXME: add pizzas such as the svn revision read off a git note?
vcsrevision_contents = '#define LLVM_REVISION "git-%s"\n' % rev
# If the output already exists and is identical to what we'd write,
# return to not perturb the existing file's timestamp.
if os.path.exists(args.vcs_header) and \
open(args.vcs_header).read() == vcsrevision_contents:
return 0
# http://neugierig.org/software/blog/2014/11/binary-revisions.html
if args.depfile:
build_dir = os.getcwd()
with open(args.depfile, 'w') as depfile:
depfile.write('%s: %s\n' % (
args.vcs_header,
os.path.relpath(os.path.join(git_dir, 'logs', 'HEAD'),
build_dir)))
open(args.vcs_header, 'w').write(vcsrevision_contents)
if __name__ == '__main__':
sys.exit(main())
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