#!/bin/sh
# Show Qcow2 image corruption bug <https://forge.univention.org/bugzilla/show_bug.cgi?id=22221>
set -e -x
trap 'set +e ; kill $pid_kvm $pid_monitor $pid_console ; rm -f ./{monitor,console}.{in,out}' EXIT

# Restore image from backup
test -f pmh_squeeze-0.qcow2.bak2 && dd bs=1M if=pmh_squeeze-0.qcow2.bak2 of=pmh_squeeze-0.qcow2

# Create offline snapshot
qemu-img snapshot -c Off pmh_squeeze-0.qcow2

# Run VM
test -p ./monitor.in  || mkfifo ./monitor.in
test -p ./monitor.out || mkfifo ./monitor.out
test -p ./console.in  || mkfifo ./console.in
test -p ./console.out || mkfifo ./console.out
kvm -M pc-0.14 -cpu kvm32 -enable-kvm -m 512 -smp 1,sockets=1,cores=1,threads=1 -nodefconfig -nodefaults \
	-chardev pipe,id=monitor,path=monitor,server,nowait -mon chardev=monitor,mode=readline \
	-rtc base=utc \
	-boot c \
	-drive file=/var/lib/libvirt/images/pmh_squeeze-0.qcow2,if=none,id=drive-virtio-disk0,boot=on,format=qcow2,cache=writethrough -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk0,id=virtio-disk0 \
	-chardev pipe,id=serial0,path=console -device isa-serial,chardev=serial0 -nographic &
pid_kvm=$!

exec 3>./monitor.in # qemu monitor
cat ./monitor.out &
pid_monitor=$!

exec 4>./console.in # vm console
cat ./console.out &
pid_console=$!

# Wait for VM to boot
sleep 10

# Login
echo root >&4
echo univention >&4

# Create online snapshot
echo savevm On >&3 # qemu monitor
echo info snapshots >&3 # qemu monitor

# [Optional] Create modified clusters
echo dd if=/dev/zero bs=1M count=1k of=/dev/vda >&4
echo sync >&4
echo touch /boom >&4

# Quit qemu
echo quit >&3 # qemu monitor
wait

# Revert to offline snapshot
while qemu-img check pmh_squeeze-0.qcow2
do
	qemu-img snapshot -a Off pmh_squeeze-0.qcow2
done