#!/bin/sh
# Create CNI profiles for podman

dir=/etc/cni/net.d
force=
num=90

usage()
{
    cat <<EOF
usage:
  cni [opt] cmd

options:
  -f                                       Force operation, e.g. overwrite
  -h                                       Show this help text
  -n NUM                                   Create $dir/NUM-name-type.conflist

commands:
  create host NAME IFNAME IPADDR/PREFIX    Create CNI host-device profile
  help                                     Show this help text
  list                                     List available profiles
  show PROFILE                             Show profile from list command

EOF
}

create_host()
{
    nm=$1
    iface=$2
    addr=$3
    fn="$dir/$num-$nm-host.conflist"

    if [ -f "$fn" ] && [ "$force" = "" ]; then
	echo "$fn: already exists, use -f to force overwriting it."
	exit 1
    fi

    cat <<EOF > "$fn"
{
  "cniVersion": "0.4.0",
  "name": "$nm",
  "plugins": [
    {
      "type": "host-device",
      "device": "$iface",
      "ipam": {
        "type": "static",
        "addresses": [
          {
            "address": "$addr"
          }
        ]
      }
    }
  ]
}
EOF
}

while [ "$1" != "" ]; do
    case $1 in
	-f | --force)
	    force=true
	    ;;

	-h | --help)
	    usage
	    exit 0
	    ;;

	-n | --num)
	    num=$2
	    shift
	    ;;

	*)
	    break
    esac
    shift
done

cmd=$1
if [ -n "$cmd" ]; then
   shift
fi

case $cmd in
    c | create)
	type=$1
	shift
	case $type in
	    host | veth)
		#shellcheck disable=SC2068
		create_host $@
		;;
	    *)
		echo "Unsupported type"
		usage
		exit 1
		;;
	esac
	;;

    l | ls | list)
	ls -l $dir
	;;

    show | sh | cat)
	fn=$1
	[ -f "$fn" ] || fn="$dir/$1"
	jq . "$fn"
	;;

    help | *)
	usage
	;;
esac