D5570: hg-docker: fix Python 3.4 compatibility (for CentOS 7)

[yuja (Yuya Nishihara)]

yuja added a comment.


  > +    if p.returncode:
  >  +        raise Exception('failed to build docker image: %s %s' % (p.stdout, p.stderr))
  
  Can you change the exception type? test-check-code.t complains about it.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D5570

To: Mathiasdm, #hg-reviewers
Cc: yuja, mercurial-devel