#!/bin/sh

rootdir=""
group=""
action=""

usage() {
    echo "Usage: $0 -g group -a action"
    echo "Valid actions: present, absent"
    exit 1
}

run() {
    echo $*
    $*
}

OPTIND=1
while getopts d:g:a: opt ; do
    case $opt in
        d)
            rootdir="$OPTARG"
            ;;
        g)
            group="$OPTARG"
            ;;
        a)
            action="$OPTARG"
            ;;
        *)
            usage
            ;;
    esac
done

shift $(($OPTIND - 1))

if test -z "$group" -o -z "$action"; then
    usage
fi

root=""

if test -n "$rootdir"; then
    root="-R $rootdir"
fi

case "$action" in
    present)
        if pw $root group show "$group" > /dev/null 2>&1; then
            if pw $root group show "$group" | grep -q LOCKED; then
                echo "$group exists."
            fi
        else
            run pw $root group add "$group"
        fi
        ;;
    absent)
        if pw $root group show "$group" > /dev/null 2>&1; then
            run pw $root group del "$group"
        fi
        ;;
    *)
        usage
        ;;
esac