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#!/bin/sh
. samizdat-paths.sh
case "$(id -u)" in
0) sudo= ;;
*) sudo=sudo ;;
esac
iso=${samizdat_iso_dir}/samizdat.iso
disk=${samizdat_iso_dir}/samizdat.disk.img
layered=${samizdat_iso_dir}/${iso%.iso}.layered.iso
[ -f "$layered" ] && iso=$layered
[ "$1" ] && iso=$1
[ "$NO_NET" ] || USE_NET=y
NET='tap,ifname=tap0,script=no,downscript=no'
[ "$SLOW_BOOT" ] || QEMU_LOADS_LINUX=y
# To use qemu built-in pxe boot server:
# NET='user,tftp=isolinux,bootfile=/pxelinux.0'
nbd_filename=samizdat.btrfs
[ "$NBD_FILENAME" ] && nbd_filename=$NBD_FILENAME
initrd=${samizdat_isolinux_dir}/linux/initrd.img
kernel=${samizdat_isolinux_dir}/linux/vmlinuz
kcmdline_CDROM='boot=samizdat components quiet'
kcmdline_CDROM_NET="${kcmdline_CDROM} nbdroot=,${nbd_filename}, nbddev=/dev/nbd0 ip=dhcp"
kcmdline_NET="${kcmdline_CDROM_NET} netkeys"
find_mac()
{
start_mac=$1
for mac in $(ip link show | grep link/ether | (read _ mac _; echo $mac | tr : -)); do
if [ "${mac%??}" = "${start_mac%??}" ]; then
prefix=${mac%??}
suffix=$(printf %x $(( 0x${mac##*-} + 1 )))
MAC=${prefix}${suffix}
return
fi
done
MAC=$start_mac
}
find_mac 52-54-00-12-34-56
kcmdline_BOOTIF="BOOTIF=01-$MAC"
set --
if [ "$USE_ISO" ]; then
set -- "$@" -cdrom "$iso"
if [ "$QEMU_LOADS_LINUX" ]; then
set -- "$@" -initrd "$initrd" -kernel "$kernel"
if [ "$NO_NET" ]; then
set -- "$@" -append "$kcmdline_CDROM"
else
set -- "$@" -append "$kcmdline_CDROM_NET"
fi
else
set -- "$@" -boot d
fi
else
if [ "$QEMU_LOADS_LINUX" ]; then
set -- "$@" -initrd "$initrd" -kernel "$kernel" -append "$kcmdline_NET $kcmdline_BOOTIF"
else
set -- "$@" -boot n
fi
fi
case $(arch) in
x86_64) qemu=qemu-system-x86_64 ;;
*) qemu=qemu-system-i386 ;;
esac
try_fallocate()
{
for size in "$@"; do
fallocate -l "$size" "$disk"~tmp || continue
mv "$disk"~tmp "$disk"
return
done
false
}
if [ ! -e "$disk" ]; then
try_fallocate 16GB 8GB 4GB 2GB 1GB ||
echo "Warning: no virtual disk (could not create $disk)" >&2
fi
if grep -q '^flags.*\<vmx\>' /proc/cpuinfo; then
kvm='-enable-kvm -cpu host'
read nested < /sys/module/kvm_intel/parameters/nested
if [ "$nested" != Y ]; then
printf '%s\n' \
'Warning: nested KVM is not available' \
'Try "make install-nested-kvm"'
fi
else
>&2 printf '%s\n' \
'' \
'Warning: kernel virtual machine extensions (KVM) not available.' \
'The VM will be intolerably slow.' \
'If your hardware supports KVM, you need to enable it in the BIOS.' \
'' \
'If you are trying to run qemu in a virtual machine, you need to append' \
'the kvm-(intel|amd) module parameter "nested=1" on the _host_ machine.' \
'Use "make install-nested-kvm" to do so.' \
''
kvm=
fi
mem_total=$(grep MemTotal /proc/meminfo | (read _ kb _; echo $((kb / 1024))))
use_mem=640
if [ "$mem_total" -le $((use_mem * 2)) ]; then
use_mem=$((mem_total / 2))
fi
set -x
$sudo ${qemu} ${kvm} -smp 2 -m ${use_mem} -k en-us \
-vga qxl \
-net nic,model=virtio,macaddr=$MAC \
${USE_NET:+ -net "$NET"} \
-rtc base=localtime \
-drive index=0,media=disk,format=raw,file="$disk" \
"$@"
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