bugg@tom-laptop2:~/Projects/sparkler/sparkler-deployment/juju/sparkler$ charm --debug build .
build: Composing into /home/bugg/Projects/charms
build: Destination charm directory: /home/bugg/Projects/charms/builds/sparkler
build: Processing layer: layer:basic
build: Processing layer: sparkler (from .)
build: Processing interface: java
build: Processing interface: spark
build: Processing interface: solr
charmtools.build.tactics: Missing implementation for interface role: requires.py
2017-02-01 15:02:00 INFO cmd supercommand.go:465 command finished
bugg@tom-laptop2:~/Projects/sparkler/sparkler-deployment/juju/sparkler$