Imports github.com/cloudflare/cfssl/log github.com/docker/docker/api/types github.com/docker/docker/client github.com/docker/docker/image github.com/docker/docker/image/v1 github.com/docker/docker/layer github.com/opencontainers/go-digest gopkg.in/urfave/cli.v1 Standard library imports archive/tar compress/gzip context fmt io os strings time