#!/bin/bash

set -e

docker_ps_opts=""
dry_run=false
hours="10"

OPTS="`getopt -o v -l docker_ps_opts:,dry_run,hours: -- "$@"`"
while test $# -gt 1; do
    case $1 in
	--docker_ps_opts) docker_ps_opts="$2"; shift ;;
	--dry_run) dry_run="$2"; shift ;;
	--hours) hours="$2"; shift ;;
	-v) set -x ;;
    esac
    shift
done

if [ "$hours" -lt "1" ]; then
    echo "ERROR: Refusing to delete containers that are $hours days old"
    exit 1
fi

echo "Container report before:"
docker ps $docker_ps_opts

rm_containers=()
for container in $(docker ps --format "{{.ID}} {{.RunningFor}}" $docker_ps_opts | grep "hour" | cut -d" " -f 1); do
    if [ "$(docker ps --format "{{.ID}} {{.RunningFor}}" $docker_ps_opts | grep "$container:" | cut -d" " -f 2)" -gt "$hours" ]; then
        rm_containers=("${rm_containers[@]}" $container)
    fi
done

status="0"
if [ ${#rm_containers[@]} != 0 ]; then
    echo "Removing containers: ${rm_containers[@]}"
    if ! $dry_run; then
        for container in "${rm_containers[@]}"; do
            echo "Removing container $container"
            docker rm -f -v $container | true
            if [ x"${PIPESTATUS[0]}" = x"0" ]; then
                echo "SUCCESS"
            else
                echo "FAILED"
                status="1"
            fi
        done
    else
        echo "DRY_RUN: NOT REMOVING CONTAINERS"
	status="1"
    fi

    echo "Containers report after:"
    docker ps $docker_ps_opts
fi
exit $status