#!/bin/sh

set -e

STATE="$1"
FILES="$2"

prev_containers_file="$FILES"/tmp/prev_containers.list

case "$STATE" in

    NeedsArtifactReboot)
        echo "No"
        ;;

    SupportsRollback)
        echo "Yes"
        ;;

    ArtifactInstall)
        docker ps -q > $prev_containers_file
        [ -n "$(cat $prev_containers_file)" ] && docker stop $(cat $prev_containers_file)
        for container in $(jq -r ".containers[]" "$FILES"/header/meta-data); do
            docker pull $container
            docker run -dt $container
        done
        ;;

    ArtifactRollback)
        [ -f $prev_containers_file ] || exit 1
        [ -n  "$(docker ps -q)" ] && docker stop $(docker ps -q)
        [ -n "$(cat $prev_containers_file)" ] && docker start $(cat $prev_containers_file)
        ;;
esac

exit 0
