Imports github.com/juju/collections/set github.com/juju/errors github.com/juju/juju/core/instance github.com/juju/juju/state/backups github.com/juju/testing github.com/juju/testing/checkers github.com/juju/utils/filestorage gopkg.in/check.v1 gopkg.in/juju/names.v2 Standard library imports archive/tar bytes compress/gzip encoding/base64 io os path strings time crypto/sha1