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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 '$IMAGE' not found"
test -s "$IMAGE" || die "image '$IMAGE' is empty"
if ! printf '\123\357' | cmp --bytes=2 "$IMAGE" - 1080; then
die "image '$IMAGE' is not in ext4 format"
fi
if ! printf 'debvm\000' | cmp --bytes=6 "$IMAGE" - 1144; then
die "image '$IMAGE' was not created by debvm-create (wrong disk label)"
fi
cleanup() {
set +x
test -n "$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
mips*|ppc64el)
KERNELLINK=vmlinux
;;
*)
KERNELLINK=vmlinuz
;;
esac
KERNELNAME=$(/sbin/debugfs "$IMAGE" -R "stat $KERNELLINK" | sed 's/Fast link dest: "\(.*\)"/\1/;t;d')
INITRDNAME=$(/sbin/debugfs "$IMAGE" -R "stat initrd.img" | sed 's/Fast link dest: "\(.*\)"/\1/;t;d')
test -n "$KERNELNAME" || die "failed to discover kernel image"
test -n "$INITRDNAME" || die "failed to discover initrd image"
KERNEL_CMDLINE="root=LABEL=debvm rw"
NETDEV="user,id=net0"
set -- \
-no-user-config \
-name "debvm-run $IMAGE" \
-m 1G \
-smp "$(nproc)" \
-kernel "$KERNELTMP" \
-initrd "$INITRDTMP" \
-object rng-random,filename=/dev/urandom,id=rng0 -device virtio-rng-pci,rng=rng0 \
-drive "media=disk,format=raw,discard=unmap,file=$IMAGE,if=virtio,cache=unsafe" \
-device "virtio-net-pci,netdev=net0" \
"$@"
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 "$@"
fi
case "$VMARCH" in
arm64)
set -- -machine type=virt,gic-version=host "$@"
;;
esac
else
case "$VMARCH" in
arm64)
QEMU=qemu-system-aarch64
set -- -machine virt -cpu max "$@"
;;
arm|armel|armhf)
QEMU=qemu-system-arm
set -- -machine virt -cpu max "$@"
;;
ppc64el)
QEMU=qemu-system-ppc64
;;
*)
QEMU="qemu-system-$VMARCH"
;;
esac
fi
if test -z "$GRAPHICAL"; then
set -- -nographic "$@"
case "$VMARCH" in
amd64|i386)
KERNEL_CMDLINE="$KERNEL_CMDLINE console=ttyS0"
;;
esac
fi
if test -n "$SSHPORT"; then
NETDEV="$NETDEV,hostfwd=tcp:127.0.0.1:$SSHPORT-:22"
fi
DNSSEARCH=$(dnsdomainname)
if test -n "$DNSSEARCH"; then
NETDEV="$NETDEV,dnssearch=$DNSSEARCH"
fi
set -- \
-append "$KERNEL_CMDLINE" \
-netdev "$NETDEV" \
"$@"
set -ex
/sbin/debugfs "$IMAGE" -R "cat $KERNELNAME" > "$KERNELTMP"
/sbin/debugfs "$IMAGE" -R "cat $INITRDNAME" > "$INITRDTMP"
"$QEMU" "$@"
|
