Problems with colocated layered and non-layered Charms

[Merlijn Sebrechts]

Hi


Layered Charms use Python 3 and install pip3 as default pip. This causes
great problems for colocated non-layered Charms who expect that default pip
is pip2.

An example is the combination of juju-gui with any layered Charm. You get
the following error:

unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40 Traceback (most recent call last):
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/install", line 92, in
<module>
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     main()
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/install", line 85, in main
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     backend.install()
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/backend.py", line 181, in
install
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     call_methods(self.mixins, 'install', self)
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/backend.py", line 134, in
call_methods
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     method(*args)
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/backend.py", line 101, in
install
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     utils.install_builtin_server()
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/utils.py", line 297, in
install_builtin_server
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     '-r', requirements
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40   File
"/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/shelltoolbox.py", line
458, in run
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40     raise exception
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 INFO unit.juju-gui/0.install
logger.go:40 subprocess.CalledProcessError: Command '['pip', 'install',
'--no-index', '--no-dependencies', '--find-links',
'file:////var/lib/juju/agents/unit-juju-gui-0/charm/deps', '-r',
'/var/lib/juju/agents/unit-juju-gui-0/charm/server-requirements.pip']'
returned non-zero exit status 1
unit-juju-gui-0[8052]: 2016-01-28 09:35:53 ERROR
juju.worker.uniter.operation runhook.go:107 hook "install" failed: exit
status 1



Running it manually:

pip install --no-index --no-dependencies --find-links
file:////var/lib/juju/agents/unit-juju-gui-0/charm/deps -r
/var/lib/juju/agents/unit-juju-gui-0/charm/server-requirements.pip
Ignoring indexes: https://pypi.python.org/simple
Collecting argparse==1.2.1 (from -r
/var/lib/juju/agents/unit-juju-gui-0/charm/server-requirements.pip (line 1))
  Could not find a version that satisfies the requirement argparse==1.2.1
(from -r /var/lib/juju/agents/unit-juju-gui-0/charm/server-requirements.pip
(line 1)) (from versions: )
No matching distribution found for argparse==1.2.1 (from -r
/var/lib/juju/agents/unit-juju-gui-0/charm/server-requirements.pip (line 1))

`pip2 install ....` works..



Kind regards
Merlijn Sebrechts
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