#!/bin/sh

rootdir=""
group=""
id=""
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:i: opt ; do
    case $opt in
        d)
            rootdir="$OPTARG"
            ;;
        g)
            group="$OPTARG"
            ;;
        i)
            id="$OPTARG"
            ;;
        a)
            action="$OPTARG"
            ;;
        *)
            usage
            ;;
    esac
done

shift $(($OPTIND - 1))

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

# we do it once for $rootdir and once on the host to have synchronous groups
for root in "$rootdir" ""; do
    args=""

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

    if test -n "$id"; then
        args="-g $id"
    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" $args
            fi
            ;;
        absent)
            if pw $root group show "$group" > /dev/null 2>&1; then
                run pw $root group del "$group"
            fi
            ;;
        *)
            usage
            ;;
    esac
done