arch-ppa/src/biboumi-git/biboumi.install

post_install() {
    systemd-sysusers biboumi.conf
    install -dm750 -o biboumi -g jabber var/lib/biboumi
    install -dm750 -o biboumi -g jabber var/log/biboumi
}

post_upgrade() {
    post_install $1
}

post_remove() {
    systemd-sysusers biboumi.conf
}