After deploying the charm and checking to make sure that it worked as expected. Changing the juju-gui-source configuration option causes a config change hook failure.
Juju: 1.22-beta4-trusty-amd64
Juju-GUI: trusty-19
Error message:
2015-03-02 20:42:50 INFO unit.juju-gui/0.juju-log cmd.go:247 fatal: Refusing to fetch into current branch refs/heads/develop of non-bare repository
Unexpected end of command stream
Full traceback:
2015-03-02 20:41:27 INFO unit.juju-gui/0.juju-log cmd.go:247 Using source https://github.com/juju/juju-gui.git: develop
2015-03-02 20:42:38 INFO unit.juju-gui/0.juju-log cmd.go:247 Retrieving Juju GUI source checkout from https://github.com/juju/juju-gui.git (develop).
2015-03-02 20:42:50 INFO unit.juju-gui/0.juju-log cmd.go:247 Exception caught:
2015-03-02 20:42:50 INFO unit.juju-gui/0.juju-log cmd.go:247 fatal: Refusing to fetch into current branch refs/heads/develop of non-bare repository
Unexpected end of command stream
2015-03-02 20:42:50 INFO unit.juju-gui/0.juju-log cmd.go:247 <<< Exiting config-changed
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 Traceback (most recent call last):
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/config-changed", line 58, in <module>
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 main()
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/config-changed", line 49, in main
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 backend.install()
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/backend.py", line 286, in install
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 call_methods(self.mixins, 'install', self)
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/backend.py", line 219, in call_methods
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 method(*args)
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/backend.py", line 114, in install
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 branch_url, revision, logpath)
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/utils.py", line 665, in fetch_gui_from_branch
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 'origin', '{0}:{0}'.format(revision)))
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 File "/var/lib/juju/agents/unit-juju-gui-0/charm/hooks/shelltoolbox.py", line 457, in run
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 raise exception
2015-03-02 20:42:50 INFO unit.juju-gui/0.config-changed logger.go:40 subprocess.CalledProcessError: Command '['git', '--git-dir', '/var/lib/juju/agents/unit-juju-gui-0/charm/juju-gui-source/.git', '--work-tree', '/var/lib/juju/agents/unit-juju-gui-0/charm/juju-gui-source', 'fetch', '--depth', '1', 'origin', 'develop:develop']' returned non-zero exit status 128
2015-03-02 20:42:50 ERROR juju.worker.uniter.operation runhook.go:86 hook "config-changed" failed: exit status 1
This should have been just 'develop' as a value unless you're referring to a fork of the repo. Closing this as invalid. If it doesn't work pointing to a fork please open a bug with the info from that failed attempt.