post_install() {
    echo "Install Repetier-Server"
    id -u repetierserver &>/dev/null || useradd --home-dir /opt/RepetierServer --system -U repetierserver
    usermod -G uucp -a repetierserver
    chown -R repetierserver /opt/RepetierServer
    chmod 755 /opt/RepetierServer/modules/firmware/bin/avrdude
    chmod 755 /opt/RepetierServer/modules/firmware/bin/bossac
    chmod 755 /opt/RepetierServer/modules/firmware/bin/teensy_loader_cli

    # Fix paths
    sed -i 's|/usr/local/Repetier-Server/|/opt/RepetierServer/|g' /opt/RepetierServer/etc/RepetierServer.xml
    sed -i 's|/usr/local/Repetier-Server/|/opt/RepetierServer/|g' /opt/RepetierServer/RepetierServer.service
    sed -i 's|/var/lib/Repetier-Server/|/opt/RepetierServer/data/|g' /opt/RepetierServer/etc/RepetierServer.xml
    sed -i 's|/var/lib/Repetier-Server|/opt/RepetierServer/data|g' /opt/RepetierServer/RepetierServer.service

    # install systemd service
    mv /opt/RepetierServer/RepetierServer.service /usr/lib/systemd/system/
    systemctl --system daemon-reload
}

post_upgrade() {
    post_install $1
}

post_remove() {
    echo "Removing repetierserver system user"
    id -u repetierserver &>/dev/null && userdel repetierserver
    id -g repetierserver &>/dev/null && groupdel repetierserver
    rm -r /usr/lib/systemd/system/RepetierServer.service
}

pre_remove() {
    echo "stopping Repetier-Server"
    systemctl stop RepetierServer
}

op=$1
shift
$op $*