Script to recover Dockerfile from Docker image

Dockerfile-recovery.sh

#!/usr/bin/env sh
# (run)$ ./Dockerfile-recovery.sh <IMAGE ID>

docker history --no-trunc "$1" | sed -n -e 's,.*/bin/sh -c #(nop) \(MAINTAINER .*[^ ]\) *0 B,\1,p' | head -1
docker inspect --format='{{range $e := .Config.Env}}

ENV {{$e}}
{{end}}{{range $e,$v := .Config.ExposedPorts}}

EXPOSE {{$e}}
{{end}}{{range $e,$v := .Config.Volumes}}

VOLUME {{$e}}
{{end}}{{with .Config.User}}USER {{.}}{{end}}
{{with .Config.WorkingDir}}WORKDIR {{.}}{{end}}
{{with .Config.Entrypoint}}ENTRYPOINT {{json .}}{{end}}
{{with .Config.Cmd}}CMD {{json .}}{{end}}
{{with .Config.OnBuild}}ONBUILD {{json .}}{{end}}' "$1"