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#!/bin/sh
#
# Create a new VM for liw.
set -eu
verbose()
{
echo "INFO: $@"
}
die()
{
echo "$@" 1>&2
exit 1
}
get_ip()
{
python -c '
import sys, json
leases = json.load(open(sys.argv[1]))
for lease in leases:
if lease["mac-address"] == sys.argv[2]:
print lease["ip-address"]
' "$1" "$2" || true
}
xz_uncompressed_size()
{
xz --robot --verbose --list "$1" | awk '/^file/ { print $5 }'
}
raw_uncompressed_size()
{
stat -c %s "$1"
}
# Check parameters.
if [ "$#" -lt 2 ]
then
die "Usage: $0 NAME BASE [virt-install-options]"
fi
verbose "Command line args OK"
# Config variables.
. "$HOME/.config/ansibleness/vm.conf"
verbose "Loaded config file"
# Command line parameters: name of VM and base image (no .img.xz suffix).
name="$1"
case "$2" in
*/*) basepath="$2" ;;
*) basepath="$imagedir/base-$2.img.xz" ;;
esac
verbose "basepath=$basepath"
shift 2
# Does the base image exist?
if [ ! -e "$basepath" ]
then
echo "$basepath does not exist" 1>&2
exit 1
fi
verbose "$basepath exists"
# Is base image compressed?
case "$basepath" in
*.xz) xz=true ;;
*) xz=false ;;
esac
# How large is the (uncompressed) image? In bytes.
if $xz
then
size="$(xz_uncompressed_size "$basepath")"
else
size="$(raw_uncompressed_size "$basepath")"
fi
verbose "Image is $size bytes"
# Create new LV.
verbose "Creating LV /dev/$vg/$name"
sudo lvcreate --name "$name" --size "${size}b" \
--zero y --wipesignatures n --activate y "$vg"
lvpath="/dev/$vg/$name"
verbose "lvpath=$lvpath"
#sudo lvchange -ay "$lvpath"
# Copy uncompressed image to LV.
if $xz
then
verbose "Uncompressing and copying image to LV"
unxz < "$basepath" |
pv --size "$size" |
sudo ionice -c3 tee "$lvpath" > /dev/null
else
verbose "Copying uncompressed imagew to LV"
pv "$basepath" |
sudo ionice -c3 tee "$lvpath" > /dev/null
fi
# Edit /etc/hostname
verbose "Set hostname on new system to $name"
mnt="$(mktemp -d)"
for part in $(sudo kpartx -asv "$lvpath" | awk '/^add map / { print $3 }')
do
sudo mount "/dev/mapper/$part" "$mnt"
if [ -e "$mnt/etc/hostname" ]
then
echo "$name" | sudo tee "$mnt/etc/hostname"
fi
sudo umount "$mnt"
done
sudo kpartx -dsv "$lvpath"
# Create VM.
verbose "Creating VM"
virt-install --connect qemu:///system \
--quiet \
--name="$name" \
--memory=1024 \
--cpu=host \
--import \
--os-variant=debian9 \
--disk="path=$lvpath,cache=none" \
--network="$vmnetwork" \
--graphics=spice \
--noautoconsole \
"$@"
# If we're using the virtual network "default", wait for the VM to get
# a DHCP response and add it to /etc/hosts. We don't do it for other
# types of network (e.g., bridge=br0), since we ... can't.
if [ "$vmnetwork" = "network=default" ]
then
verbose "Waiting for VM to boot and get IP"
# Get the MAC address.
mac="$(virsh -c qemu:///system dumpxml "$name" |
sed -n "/<mac address=/s/^.*'\(.*\)'.*/\1/p")"
verbose "MAC: $mac"
# Get IP address related to the MAC address. Append that to /etc/hosts.
leases=/var/lib/libvirt/dnsmasq/virbr0.status
ip=""
while [ "$ip" = "" ]
do
sleep 1
if [ -s "$leases" ]
then
ip="$(get_ip "$leases" "$mac")"
fi
done
echo "$ip $name" | sudo tee -a /etc/hosts > /dev/null
# Done.
echo "Virtual machine $name ($ip) has been created and started."
else
echo "Virtual machine $name has been created and started, and may be ready soon."
fi
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