user=`relation-get user`
password=`relation-get password`
mysqlhost=`relation-get private-address`

ubuntu@mfisch-local-tracks-0:~$ relation-get user
usage: relation-get [-h] [-o OUTPUT] [-s SOCKET] [--client-id CLIENT_ID]
                    [--format FORMAT] [--log-file FILE]
                    [--log-level CRITICAL|DEBUG|INFO|ERROR|WARNING]
                    [-r RELATION ID]
                    [settings_name] [unit_name]
No JUJU_AGENT_SOCKET/-s option found

juju bootstrap
    juju deploy local:wordress # local:$charm
    juju get wordpress # $charm, gets config.yaml
    juju set wordpress name=value # set any $charm name

    juju debug-hooks wordpress/0 # $charm/$int
    $charm-$int: config-get # get config.yaml

juju deploy wordpress

juju debug-hooks wordpress/0

juju debug-hooks service/#

juju debug-hooks service/#

juju add-relation wordpress mysql

1: db-relation-changed

set|grep JUJU

JUJU_AGENT_SOCKET=/var/lib/juju/units/rsetter-1/.juju.hookcli.sock
JUJU_CLIENT_ID=constant
JUJU_DEBUG=/tmp/tmp.ZiobnuyhQh
JUJU_ENV_UUID=b4123455644323333333336d6f8383d
JUJU_PYTHONPATH=:/usr/lib/python2.7/dist-packages:/usr/lib/python2.7:/usr/lib/python2.7/plat-linux2:/usr/lib/python2.7/lib-tk:/usr/lib/python2.7/lib-old:/usr/lib/python2.7/lib-dynload:/usr/local/lib/python2.7/dist-packages:/usr/lib/pymodules/python2.7
JUJU_RELATION=rtest
JUJU_RELATION_ID=rtest:12
JUJU_REMOTE_UNIT=rgetter/1
JUJU_UNIT_NAME=rsetter/1
_JUJU_CHARM_FORMAT=1