#!/bin/bash

limit=''
while test $# -gt 0; do
    case "$1" in
	(-h|--help) cat <<EOF
$0 [OPTIONS] FILES…

OPTIONS

  -h, --help           show this help
  -s, --limit service  limit update to given service

FILES…

  List of stack names or yaml files to deploy. There must be yaml
  files with the same name. The extension .yaml may be given or not.

DESCRIPTION

  Updates the docker images of all services in the given stacks.

EOF
		    exit;;
	(-l|--limit) shift; limit=$1;;
	(*) break;;
    esac
    if test $# -lt 1; then
	echo "error: missing argument, try $0 --help" 1>&2
	exit 1
    fi
    shift
done

for f in $*; do
    name=${f%.yaml}
    file=${name}.yaml
    name=${name##*/}
    echo "upgrading ${name}"
    IFS="
"
    for param in $(sed -n '/^ *\([^:]\+\): *$/{s,,'"${name}"'_\1,;h};/^ *image: */{s///;G;s/\n/ /p}' $file); do
	IFS=" "
	if [ -z "$limit" ] || [[ "${param}" =~ " ${name}_${limit}" ]]; then
	    echo "....update $param: docker service update --image $param"
	    docker service update --image $param
	fi
    done
done