#!/bin/sh /etc/rc.common
 
USE_PROCD=1
START=99
STOP=1

UNITNAME="kvm-pihole"
PIDFILE="/var/run/$UNITNAME.pid"

CPUS="1"
MEM="500M"
DISKIMAGE="/storage/vms/$UNITNAME.img"
DISKFORMAT="qcow2"
NETBRIDGE="br-lan"
# generate a random locally administered mac address, x2:xx:xx:xx:xx:xx, x6:xx:xx:xx:xx:xx, xA:xx:xx:xx:xx:xx, xE:xx:xx:xx:xx:xx
NETMAC="xx:xx:xx:xx:xx:xx"
QMPSOCKET="/var/run/$UNITNAME-qmp.sock"
SEXPECTSOCKET="/var/run/$UNITNAME-sexpect.sock"
SERIALSOCKET="/var/run/$UNITNAME-serial.sock"

# Note: access vm serial with 'socat STDIO,cfmakeraw,escape=0x1d UNIX:<serial-socket-file>'

# to install the first time, add these options:
                #-vnc :0 \
                #-cdrom /storage/vms/ubuntu-24.04.1-live-server-amd64.iso \

start_service() {
        procd_open_instance
        procd_set_param command qemu-system-x86_64 \
                -enable-kvm \
                -display none \
                -cpu host \
                -machine type=q35,accel=kvm \
                -smp "$CPUS" \
                -m "$MEM" \
                -boot c \
                -drive file="$DISKIMAGE",cache=none,if=virtio,format="$DISKFORMAT" \
                -netdev bridge,br="$NETBRIDGE",id=lan \
                -device virtio-net-pci,mac="$NETMAC",netdev=lan \
                -object rng-random,id=rng0,filename=/dev/urandom \
                -device virtio-rng-pci,rng=rng0 \
                -qmp unix:$QMPSOCKET,server,nowait \
                -serial unix:$SERIALSOCKET,server,nowait
        #procd_set_param respawn ${respawn_threshold:-3600} ${respawn_timeout:-5} ${respawn_retry:-5}
        #procd_set_param netdev dev
        procd_set_param stdout 0
        procd_set_param stderr 0
        procd_set_param user root
        procd_set_param pidfile $PIDFILE
        procd_set_param term_timeout 60
        procd_close_instance
}

stop_service() {
        # try to gracefully shut down VM before procd kills qemu
        cmd="sexpect -sock $SEXPECTSOCKET"
        $cmd spawn -timeout 5 -autowait socat - unix-connect:$QMPSOCKET
        $cmd expect 'QMP'
        $cmd send -enter '{ "execute": "qmp_capabilities" }'
        $cmd expect 'return'
        $cmd send -enter '{ "execute": "system_powerdown" }'
        $cmd expect 'SHUTDOWN'
        $cmd wait
}