Imports github.com/juju/errors 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 gopkg.in/juju/charm.v4/hooks gopkg.in/mgo.v2/bson gopkg.in/yaml.v1 Standard library imports archive/zip bytes encoding/json errors fmt io io/ioutil net net/http net/url os path/filepath regexp sort strconv strings syscall