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|
#! /usr/bin/env bash
# Start a QEMU/KVM virtual machine.
#
# --cpu <num>
# CPU hardware threads to allocate to the VM, 1 by default.
#
# --ram <num>
# RAM to allocate to the VM, 2G by default (can be specified with G,
# M suffixes).
#
# --tap <tap>
# Existing tap interface to use instead of creating a new one.
#
# --mac <addr>
# MAC address to use for the machine.
#
# --pid <path>
# PID file path, /tmp/vm-<tap>.pid if unspecified.
#
# --monitor <path>
# Monitor UNIX socket path, /tmp/vm-<tap>-mon.sock if unspecified.
#
# --console <path>
# Console UNIX socket path, /tmp/vm-<tap>-con.sock if unspecified.
#
# --stdio
# Connect both console and monitor to stdio (multiplexed). This disables
# the creation of the monitor and console sockets.
#
# --stdio-monior
# Connect only monitor to stdio. This disables the creation of the monitor
# socket.
#
usage="usage: $0 [<options>] <vm-img> [<extra-qemu-options>]"
trap "{ exit 1; }" ERR
set -o errtrace # Trap in functions.
function info () { echo "$*" 1>&2; }
function error () { info "$*"; exit 1; }
qemu=(qemu-system-x86_64 -enable-kvm)
# The bridge is only used if we are cretaing the tap.
#
br=br0
cpu=1
ram=2G
tap=
mac="de:ad:be:ef:b8:da"
pid=
mon=
con=
stdio=
stdio_monitor=
while [ "$#" -gt 0 ]; do
case "$1" in
--cpu)
shift
cpu="$1"
shift
;;
--ram)
shift
ram="$1"
shift
;;
--tap)
shift
tap="$1"
shift
;;
--mac)
shift
mac="$1"
shift
;;
--pid)
shift
pid="$1"
shift
;;
--monitor)
shift
mon="$1"
shift
;;
--console)
shift
con="$1"
shift
;;
--stdio)
stdio=true
stdio_monitor=
shift
;;
--stdio-monitor)
stdio=
stdio_monitor=true
shift
;;
*)
break
;;
esac
done
img="$1"
shift
if [ -z "$img" ]; then
error "missing virtual machine image"
fi
if [ ! -f "$img" ]; then
error "virtual machine image '$img' does not exist"
fi
# Open the reading file descriptor and lock the machine image. Fail if unable
# to lock.
#
# Note that the file descriptor is automatically closed on the script exit and
# the lock is released.
#
exec {lfd}<"$img"
if ! flock -n "$lfd"; then
error "virtual machine image is already in use"
fi
del_tap=
if [ -z "$tap" ]; then
tap=tap9
sudo ip tuntap delete "$tap" mode tap || true
sudo ip tuntap add "$tap" mode tap user "$(whoami)"
sudo ip link set "$tap" up
#sleep 0.5s
sudo ip link set "$tap" master "$br"
del_tap=true
fi
if [ -z "$pid" ]; then
pid="/tmp/vm-$tap.pid"
fi
echo "$$" >"$pid"
if [ -z "$mon" ]; then
mon="/tmp/vm-$tap-mon.sock"
fi
if [ -z "$con" ]; then
con="/tmp/vm-$tap-con.sock"
fi
ops=(\
-m "$ram" \
-cpu host -smp "$cpu,sockets=1,cores=$cpu,threads=1" \
\
-netdev "tap,id=net0,ifname=$tap,script=no" \
-device "virtio-net-pci,netdev=net0,mac=$mac" \
\
-drive "if=none,id=disk0,file=$img,format=raw" \
-device "virtio-blk-pci,scsi=off,drive=disk0" \
\
-nographic \
)
# Console/monitor options.
#
if [ "$stdio" ]; then
# Multiplex the monitor and serial console onto stdio. In particular, this
# makes sure Ctrl-c is passed to the guest (rather than termination the QEMU
# process). To switch between monitor and console, Ctrl-a,c (to terminate
# QEMU, type quit in the monitor).
#
ops+=(-serial mon:stdio)
else
# Monitor.
#
if [ "$stdio_monitor" ]; then
ops+=(-chardev stdio,id=mon)
else
ops+=(-chardev "socket,id=mon,path=$mon,server,nowait")
fi
ops+=(-mon chardev=mon,mode=readline)
# Console.
#
ops+=(-chardev "socket,id=con,path=$con,server,nowait" \
-serial chardev:con)
fi
"${qemu[@]}" "${ops[@]}" -boot c "$@"
if [ "$pid" -o "$mon" -o "$con" ]; then
rm -f "$pid" "$mon" "$con"
fi
if [ "$del_tap" ]; then
sudo ip tuntap delete "$tap" mode tap
fi
|
