message: Ensure repos are up-to-date
  These steps are provided by the release process.
diff: @@ -220,6 +220,10 @@ def main():
  subprocess.check_call(['git', 'checkout', args.commit])
  os.chdir(workdir)
  + os.chdir('gitian-builder')
  + subprocess.check_call(['git', 'pull'])
  + os.chdir(workdir)
  +
  if args.build:
  build()
  @@ -227,6 +231,9 @@ def main():
  sign()
  if args.verify:
  + os.chdir('gitian.sigs')
  + subprocess.check_call(['git', 'pull'])
  + os.chdir(workdir)
  verify()
  if __name__ == '__main__':
  