_user=mastodon
_homedir=/var/lib/mastodon
_shell=/bin/false

post_install() {
    getent group ${_user} > /dev/null || groupadd ${_user} > /dev/null
    getent passwd ${_user} > /dev/null || useradd -d ${_homedir} -g ${_user} -s ${_shell} ${_user} > /dev/null
}