IABSD.fr/xenocara/lib/mesa/bin/git_sha1_gen.py

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• Author : jsg
  Date : 2019-01-29 10:45:31
  Hash : fecc0d40
  Message : Import Mesa 18.3.2

• lib/mesa/bin/git_sha1_gen.py

• """
  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 ""')