@@ -12,6 +12,7 @@ FROM debian:jessie

 # https://github.com/docker/docker/blob/master/project/PACKAGERS.md#runtime-dependencies

 RUN apt-get update && apt-get install -y --no-install-recommends \

 		btrfs-tools \

+		curl \

 		gcc \

 		git \

 		golang \

@@ -7,6 +7,11 @@ set -e

 # debian                           latest              f6fab3b798be        10 weeks ago        85.1 MB

 # debian                           latest              f6fab3b798be3174f45aa1eb731f8182705555f89c9026d8c1ef230cbf8301dd   10 weeks ago        85.1 MB

+if ! command -v curl &> /dev/null; then

+	echo >&2 'error: "curl" not found!'

+	exit 1

+fi

+

 usage() {

 	echo "usage: $0 dir image[:tag][@image-id] ..."

 	echo "   ie: $0 /tmp/hello-world hello-world"