AttributeError: 'module' object has no attribute 'check_output' running hacking.py

[Kevin L. Mitchell]

Running "tox -e pep8" now reports the following:

    Traceback (most recent call last):
      File "tools/hacking.py", line 408, in <module>
        once_git_check_commit_title()
      File "tools/hacking.py", line 389, in once_git_check_commit_title
        title = subprocess.check_output('git log --pretty=%s -1', shell=True)
    AttributeError: 'module' object has no attribute 'check_output'

This will be an issue on systems running Python 2.6 only, which is why it didn't interfere with gate checks; subprocess from Python 2.7 does have the check_output() function.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/10331

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/10331
Committed: http://github.com/openstack/nova/commit/e6f2e886a4246098eefae9d9a564b321b28280c2
Submitter: Jenkins
Branch: master

commit e6f2e886a4246098eefae9d9a564b321b28280c2
Author: Chris Behrens <email address hidden>
Date: Thu Jul 26 09:15:09 2012 +0000

    Replace subprocess.check_output with Popen

    The check_output method does not exist in python 2.6

    Fixes bug 1029014

    Change-Id: I1ee24fa2029f21706924cc19dfcbc41655b022e6