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#!/bin/sh
set -e
# Author: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
# Date: 2011-01-26
# License: GPL v3+
## expect to pull these values from the environment:
# VMNAME=snapper
# OWNER=jrollins
# RAM=512
# HDA=/path/to/disk0 # optional
# HDB=/path/to/disk1 # optional
# HDC=/path/to/disk2 # optional
# HDD=/path/to/disk3 # optional
if [ -z "$VMNAME" ] ; then
exit 1
fi
TAP="${TAP:-${VMNAME}}"
# MAC address is derived from a hash of the host's name and the guest's name:
MAC="${MAC:-$(printf "02:%s" "$(printf "%s\0%s" "$(hostname)" "${VMNAME}" | sha256sum | sed 's/\(..\)/\1:/g' | cut -f1-5 -d:)" )}"
###################
OWNERGROUP=$(groups "$OWNER" | cut -f1 -d\ )
OWNERHOME=$(getent passwd "$OWNER" | cut -f6 -d: )
up() {
# bring up the network tap:
modprobe -v tun
ip tuntap add dev "$TAP" mode tap user "$OWNER"
ip link set "$TAP" up
brctl addif br0 "$TAP"
chpst -u "$OWNER:$OWNERGROUP" mkdir -p "$OWNERHOME/vms/$VMNAME"
CDISO="$OWNERHOME/vms/$VMNAME/cd.iso"
NETBOOT="$OWNERHOME/vms/$VMNAME/netboot"
KVMARGS=
BOOTCHOICE=c
if [ -e "$NETBOOT" ] ; then
BOOTCHOICE=n
elif [ -e "$CDISO" ] && [ -e $(readlink -f "$CDISO") ] ; then
KVMARGS="-cdrom $CDISO"
BOOTCHOICE=d
fi
for disk in "$HDA" "$HDB" "HDC" "HDD"; do
if printf "%s" "$disk" | grep '^/dev/mapper/'; then
mappername=$(printf "%s" "$disk" | sed 's!^/dev/mapper/!!')
udevadm trigger --subsystem-match=block --attr-match=dm/name="$mappername"
udevadm trigger /dev/kvm
fi
done
# set up the disks, if needed:
[ -z "$HDA" ] || KVMARGS="$KVMARGS -drive file=$HDA,if=virtio,id=hda,boot=on,format=raw"
[ -z "$HDB" ] || KVMARGS="$KVMARGS -drive file=$HDB,if=virtio,id=hdb,format=raw"
[ -z "$HDC" ] || KVMARGS="$KVMARGS -drive file=$HDC,if=virtio,id=hdc,format=raw"
[ -z "$HDD" ] || KVMARGS="$KVMARGS -drive file=$HDD,if=virtio,id=hdd,format=raw"
LOGNAME="$OWNERHOME/vms/$VMNAME/console"
ln -sfT "$LOGNAME" ./servicelog
if [ -e "$LOGNAME" ] ; then
chpst -u "$OWNER" mv "$LOGNAME" "$LOGNAME".$(date +%F_%T%z|tr : .)
fi
MONITORNAME="$OWNERHOME/vms/$VMNAME/monitor.socket"
CONSOLENAME="$OWNERHOME/vms/$VMNAME/console.socket"
kvmsend() {
socat STDIO "UNIX:$MONITORNAME" <<EOF
$1
EOF
}
chpst -u "$OWNER:$OWNERGROUP:kvm" \
/usr/bin/kvm $KVMARGS \
-M "${MACHINE:-pc}" \
-enable-kvm \
-nodefaults \
-nographic \
-name "$VMNAME" \
-m "$RAM" \
-boot "$BOOTCHOICE" \
-chardev "socket,id=monitor,path=$MONITORNAME,server,nowait" -mon chardev=monitor,mode=readline \
-rtc base=utc \
-usb \
-device virtio-balloon-pci,id=balloon0,bus=pci.0 \
-chardev "socket,id=serial0,path=$CONSOLENAME,server" -device isa-serial,chardev=serial0 \
-smp "${SMP:-1},maxcpus=${MAXCPUS:-8}" \
-device "virtio-net-pci,vlan=0,id=net0,mac=$MAC,bus=pci.0" \
-net "tap,ifname=$TAP,script=no,downscript=no,vlan=0,name=hostnet0" &
chpst -u "$OWNER:$OWNERGROUP" \
/usr/bin/screen -D -m -L -c /etc/screenrc.kvm-manager -S "$VMNAME" -t "$VMNAME" socat STDIO,raw,echo=0 "UNIX:${CONSOLENAME},retry=30" &
set +e
# handle regular signals
trap 'kvmsend system_reset; wait %1' HUP
trap 'kvmsend system_powerdown; wait %1' TERM
trap 'kvmsend cont; wait %1' CONT
# use SIGINT instead of SIGSTOP for freezing the guest because
# trapping SIGSTOP is undefined:
# http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_28
trap 'kvmsend stop; wait %1' INT
trap 'kill %1 ; kill %2' EXIT
wait %1
}
down() {
brctl delif br0 "$TAP"
ip link set "$TAP" down
ip tuntap del mode tap dev "$TAP"
# no need to lock up the block device as well, since the owner might
# prefer to manipulate the disk directly.
}
log() {
LOGDIR="$OWNERHOME/vms/$VMNAME/servicelog"
chpst -u "$OWNER" mkdir -p "$LOGDIR"
exec chpst -u "$OWNER" svlogd -tt "$LOGDIR"
}
case "$1" in
up|down|log)
"$1"
;;
*)
echo "Usage: $0 [up|down]" >&2
exit 1
;;
esac
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