mmdebstrap/run_qemu.sh

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#!/bin/sh
set -eu
: "${DEFAULT_DIST:=unstable}"
: "${cachedir:=./shared/cache}"
tmpdir="$(mktemp -d)"
cleanup() {
rv=$?
rm -f "$tmpdir/debian-$DEFAULT_DIST-overlay.qcow"
[ -e "$tmpdir" ] && rmdir "$tmpdir"
if [ -e shared/result.txt ]; then
head --lines=-1 shared/result.txt
res="$(tail --lines=1 shared/result.txt)"
rm shared/result.txt
if [ "$res" != "0" ]; then
# this might possibly overwrite another non-zero rv
rv=1
fi
fi
exit $rv
}
trap cleanup INT TERM EXIT
# the path to debian-$DEFAULT_DIST.qcow must be absolute or otherwise qemu will
# look for the path relative to debian-$DEFAULT_DIST-overlay.qcow
qemu-img create -f qcow2 -b "$(realpath $cachedir)/debian-$DEFAULT_DIST.qcow" -F qcow2 "$tmpdir/debian-$DEFAULT_DIST-overlay.qcow"
# to connect to serial use:
# minicom -D 'unix#/tmp/ttyS0'
qemu-system-x86_64 \
-no-user-config \
-M accel=kvm:tcg -m 1G -nographic \
-object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 \
-monitor unix:/tmp/monitor,server,nowait \
-serial unix:/tmp/ttyS0,server,nowait \
-serial unix:/tmp/ttyS1,server,nowait \
-net nic,model=virtio -net user \
-virtfs local,id=mmdebstrap,path="$(pwd)/shared",security_model=none,mount_tag=mmdebstrap \
-drive file="$tmpdir/debian-$DEFAULT_DIST-overlay.qcow",cache=unsafe,index=0,if=virtio