pre_install() {
    getent group gvm > /dev/null || groupadd --system gvm
    getent passwd gvm > /dev/null || useradd --system --gid gvm \
        --home-dir /var/lib/openvas --no-create-home gvm
}

post_install() {
    chown -R gvm:gvm /var/lib/openvas
    chown -R gvm:gvm /var/lib/gvm
    chown -R gvm:gvm /run/gvm
    chown -R gvm:gvm /var/log/gvm
 }

pre_upgrade() {
    pre_install
}

post_upgrade() {
    post_install
}

post_remove() {
    getent passwd gvm > /dev/null && userdel gvm
}
