Imports github.com/juju/errors github.com/juju/loggo github.com/juju/version/v2 github.com/juju/utils/v2/symlink github.com/juju/juju/tools github.com/juju/juju/juju/names Standard library imports crypto/sha256 encoding/json fmt io io/ioutil os path path/filepath strings compress/gzip archive/tar