glance-simplestreams-sync fails to get deployed in Xenial (no "python2.7")

[Alvaro Uria]

glance-simplestream-sync charm fails on Xenial because python2.7 is not installed by default.

Later (after having manually installed "python" package), charm deploy failed on config-changed because:
"""
2016-08-18 18:41:13 INFO config-changed Traceback (most recent call last):
2016-08-18 18:41:13 INFO config-changed File "/var/lib/juju/agents/unit-glance-simplestreams-sync-0/charm/hooks/config-changed", line 108, in <module>
2016-08-18 18:41:13 INFO config-changed release = get_os_codename_package('glance-common', fatal=False) or 'icehouse'
2016-08-18 18:41:13 INFO config-changed File "/var/lib/juju/agents/unit-glance-simplestreams-sync-0/charm/hooks/charmhelpers/contrib/openstack/utils.py", line 218, in get_os_codename_package
2016-08-18 18:41:13 INFO config-changed import apt_pkg as apt
2016-08-18 18:41:13 INFO config-changed ImportError: No module named apt_pkg
2016-08-18 18:41:13 ERROR juju.worker.uniter.operation runhook.go:107 hook "config-changed" failed: exit status 1
"""

[Alvaro Uria (aluria)]

Workaround steps:
* deploy glance-simplestreams-sync in Xenial (hook install fails)
* manually install packages: python python-apt
* juju run --unit glance-simplestreams-sync/0 hooks/install
* juju resolved glance-simplestreams-sync/0

[Alvaro Uria (aluria)]

Still had an error regarding "hypervisor_mapping" being used by python-simplestreams (lp#1578622) at /usr/lib/python2.7/dist-packages/simplestreams/mirrors/glance.py (line 242) but not initialized by /usr/share/glance-simplestreams-sync/glance-simplestreams-sync.py (line 184):
"""
        config = {'max_items': mirror_info['max'],
                  'modify_hook': charm_conf['modify_hook_scripts'],
                  'keep_items': False,
                  'content_id': content_id,
                  'cloud_name': charm_conf['cloud_name'],
                  'item_filters': mirror_info['item_filters'],
                  'hypervisor_mapping': False}
"""

By adding 'hypervisor_mapping', I was able to sync images from upstream into glance.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Robie Basak (racb)]

Thank you for taking the time to report this bug and helping to make Ubuntu better.

As far as I can tell, this is a charm bug. If simplestreams packaging needs fixing, please explain what is broken there and change the bug status for simplestreams back to New. Thanks!

[James Page (james-page)]

Fixes pushed to branch - will publish to charm store once I've finished testing this and other changes I'm making.