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"
rm -f "$tmpdir/log"
[ -e "$tmpdir" ] && rmdir "$tmpdir"
if [ -n "${TAIL_PID:-}" ]; then
kill "$TAIL_PID"
fi
if [ -e shared/output.txt ]; then
res="$(cat shared/exitstatus.txt)"
if [ "$res" != "0" ]; then
# this might possibly overwrite another non-zero rv
rv=1
fi
fi
exit $rv
}
trap cleanup INT TERM EXIT
ARCH=$(dpkg --print-architecture)
case $ARCH in
i386)
MACHINE="accel=kvm:tcg"
CODE="/usr/share/OVMF/OVMF32_CODE_4M.secboot.fd"
QEMUARCH="i386"
;;
amd64)
MACHINE="accel=kvm:tcg"
CODE="/usr/share/OVMF/OVMF_CODE.fd"
QEMUARCH="x86_64"
;;
arm64)
MACHINE="type=virt,gic-version=host,accel=kvm"
CODE="/usr/share/AAVMF/AAVMF_CODE.fd"
QEMUARCH="aarch64"
;;
*) echo "qemu kvm not supported on $ARCH" >&2;;
esac
echo 1 > shared/exitstatus.txt
if [ -e shared/output.txt ]; then
rm shared/output.txt
fi
touch shared/output.txt
tail -f shared/output.txt &
TAIL_PID=$!
# 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-$DEFAULT_DIST-overlay.qcow"
# to connect to serial use:
# minicom -D 'unix#/tmp/ttyS0'
#
# or this (quit with ctrl+q):
# socat stdin,raw,echo=0,escape=0x11 unix-connect:/tmp/ttyS0
ret=0
timeout --foreground 40m qemu-system-"$QEMUARCH" \
-cpu host \
-no-user-config \
-M "$MACHINE" -m 4G -nographic \
-object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 \
-monitor unix:/tmp/monitor,server,nowait \
-serial unix:/tmp/ttyS0,server,nowait \
-serial unix:/tmp/ttyS1,server,nowait \
-net nic,model=virtio -net user \
-drive if=pflash,format=raw,unit=0,read-only=on,file="$CODE" \
-virtfs local,id=mmdebstrap,path="$(pwd)/shared",security_model=none,mount_tag=mmdebstrap \
-drive file="$tmpdir/debian-$DEFAULT_DIST-overlay.qcow",cache=unsafe,index=0,if=virtio \
>"$tmpdir/log" 2>&1 || ret=$?
if [ "$ret" -ne 0 ]; then
cat "$tmpdir/log"
exit $ret
fi