#!/bin/sh
# helper script for launching ssh-agent, used by systemd unit
set -e

options="$(getopt -o '' -l help -- "$@")" || exit 1
eval set -- "$options"

if [ ! -d "$XDG_RUNTIME_DIR" ]; then
    # shellcheck disable=SC2016
    echo 'This needs $XDG_RUNTIME_DIR to be set' >&2
    exit 1
fi

while :; do
    case $1 in
        --help)
            echo 'Usage:' >&2
            echo "  $0 start [-- ssh-agent options]" >&2
            echo "  $0 stop"
            exit 0
            ;;
        --)
            shift
            break
            ;;
        *)
            echo "Unexpected argument: $1" >&2
            exit 1
            ;;
    esac
done

if [ "$1" = start ]; then
    shift
    if [ -z "$SSH_AUTH_SOCK" ] && grep -s -q '^use-ssh-agent$' /etc/X11/Xsession.options; then
        S="$XDG_RUNTIME_DIR/openssh_agent"
        dbus-update-activation-environment --verbose --systemd SSH_AUTH_SOCK="$S" SSH_AGENT_LAUNCHER=openssh
        exec ssh-agent -D -a "$S" "$@"
    fi
elif [ "$1" = stop ]; then
    if [ "$SSH_AGENT_LAUNCHER" = openssh ]; then
        dbus-update-activation-environment --systemd  SSH_AUTH_SOCK=
    fi
else
    echo "Unknown command $1" >&2
    exit 1
fi