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#!/bin/sh
# Copyright 2022 Helmut Grohne <helmut@subdivi.de>
# SPDX-License-Identifier: MIT
set -u
IMAGE=rootfs.ext2
SSHPORT=
GRAPHICAL=
die() {
echo "$*" 1>&2
exit 1
}
usage() {
die "usage: $0 [-g] [-i image] [-s sshport] [-- qemu options]"
}
while test "$#" -gt 0; do
case "$1" in
-g)
GRAPHICAL=1
shift
;;
-i)
test "$#" -eq 1 && usage
IMAGE=$2
shift 2
;;
-s)
test "$#" -eq 1 && usage
SSHPORT=$2
shift 2
;;
--)
shift
break
;;
*)
usage
;;
esac
done
test -f "$IMAGE" || die "image '$IMAGE' not found"
KERNELNAME=$(/sbin/debugfs "$IMAGE" -R "stat vmlinuz" | sed 's/Fast link dest: "\(.*\)"/\1/;t;d')
INITRDNAME=$(/sbin/debugfs "$IMAGE" -R "stat initrd.img" | sed 's/Fast link dest: "\(.*\)"/\1/;t;d')
cleanup() {
set +x
test -n "$KERNELTMP" && rm -f "$KERNELTMP"
test -n "$INITRDTMP" && rm -f "$INITRDTMP"
}
trap cleanup EXIT INT TERM QUIT
KERNELTMP=$(mktemp)
INITRDTMP=$(mktemp)
ARCHITECTURE=$(dpkg --print-architecture)
VMARCH=$ARCHITECTURE
if command -v elf-arch >/dev/null 2>&1; then
/sbin/debugfs "$IMAGE" -R "cat /bin/true" > "$KERNELTMP"
VMARCH=$(elf-arch "$KERNELTMP")
fi
case "$VMARCH" in
arm64|s390x)
DISKDEV=vda
;;
*)
DISKDEV=sda
;;
esac
KERNEL_CMDLINE=root=/dev/$DISKDEV
NETDEV="user,id=net0"
set -- \
-m 1G \
-smp "$(nproc)" \
-kernel "$KERNELTMP" \
-initrd "$INITRDTMP" \
-drive "media=disk,format=raw,discard=unmap,file=$IMAGE" \
-device "virtio-net-pci,netdev=net0" \
"$@"
if test "$ARCHITECTURE" = "$VMARCH"; then
QEMU=kvm
# While kvm will fall back gracefully, the following options can only
# be passed when kvm really is available.
if test -w /dev/kvm; then
set -- -enable-kvm -cpu host "$@"
fi
else
case "$VMARCH" in
arm64)
QEMU=qemu-system-aarch64
set -- -machine virt -cpu max "$@"
;;
*)
QEMU="qemu-system-$VMARCH"
;;
esac
fi
if test "$VMARCH" = arm64; then
set -- -nographic "$@"
elif test "$VMARCH" = s390x; then
set -- -M s390-ccw-virtio -nographic "$@"
elif test -z "$GRAPHICAL"; then
KERNEL_CMDLINE="$KERNEL_CMDLINE console=ttyS0"
set -- -nographic "$@"
fi
if test -n "$SSHPORT"; then
NETDEV="$NETDEV,hostfwd=tcp:127.0.0.1:$SSHPORT-:22"
fi
set -- \
-append "$KERNEL_CMDLINE" \
-netdev "$NETDEV" \
"$@"
set -ex
/sbin/debugfs "$IMAGE" -R "cat $KERNELNAME" > "$KERNELTMP"
/sbin/debugfs "$IMAGE" -R "cat $INITRDNAME" > "$INITRDTMP"
"$QEMU" "$@"
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