pkgbuilds/lxc-docker/lxc-docker.install

post_install()
{
    if ! getent group docker >/dev/null; then
        groupadd --system docker
    fi
}

post_upgrade()
{
    post_install $1
}

post_remove()
{
    if getent group docker >/dev/null; then
        groupdel docker
    fi
}