#!/bin/bash

exname=$(basename "$0")
usage="$exname [-h|--help] CONTAINER SIGNAL"

container=
signal=
while [ "$1" ]; do
    case "$1" in
        "--help"|"-h")
            echo "$usage" >&2
            exit 0
        ;;
        *)
            [ -z "$container" ] && { container=$1 ; shift ; continue ; }
            [ -z "$signal" ] && { signal=$1 ; shift ; continue ; }
            echo "Unexpected argument '$1'." >&2
            exit 1
        ;;
    esac
    shift
done

if [ -z "$container" ]; then
    echo "You must provide a container name/id as first argument." >&2
    echo "$usage" >&2
    exit 1
fi

if [ -z "$signal" ]; then
    echo "You must provide a signal to send to $container aargument." >&2
    echo "$usage" >&2
    exit 1
fi

container_id="$(docker inspect --format="{{ .Id }}" "$container")"

echo -e "POST /containers/$container_id/kill?signal=$signal HTTP/1.0\r\n" | nc -U /var/run/docker.sock