Imports github.com/juju/charm/hooks github.com/juju/gojsonschema github.com/juju/loggo github.com/juju/names github.com/juju/schema github.com/juju/utils github.com/juju/utils/set github.com/juju/utils/zip labix.org/v2/mgo/bson launchpad.net/goyaml Standard library imports archive/zip encoding/json errors fmt io io/ioutil net net/http net/url os path/filepath regexp strconv strings syscall