Imports github.com/juju/testing github.com/juju/utils/filestorage github.com/juju/testing/checkers github.com/juju/errors github.com/juju/juju/apiserver/params github.com/juju/juju/instance github.com/juju/juju/state/backups github.com/juju/utils/set gopkg.in/check.v1 Standard library imports crypto/sha1 archive/tar bytes compress/gzip encoding/base64 io os path strings time