create_vm.sh

#!/bin/zsh -f
set -e

HOSTNAME=$1
PASSWORD=toor

VMNAME=$HOSTNAME
FILE="$VMNAME.img"
SIZE=2G
ARCH=amd64
MEMORY=2048
CPUS=3

DEBIAN_RELEASE=wheezy
DEBIAN_MIRROR=debian.inode.at/debian

function apt_cacher() {
    aptitude install apt-cacher-ng
    DEBIAN_MIRROR="http://localhost:$(cat /etc/apt-cacher-ng/acng.conf \
                   | grep 'Port:' | cut -d ':' -f 2)/$DEBIAN_MIRROR"
}

function create_disk() {
    qemu-img create -f qcow2 $FILE.qcow2 $SIZE
    modprobe nbd
    qemu-nbd -c /dev/nbd0 $FILE.qcow2
}

function grml_debootstrap() {
    grml-debootstrap \
        --hostname $HOSTNAME --password "$PASSWORD" \
        --vmfile --target $FILE --vmsize $SIZE \
        --arch $ARCH --release $DEBIAN_RELEASE \
        --mirror $DEBIAN_MIRROR
}

function install_vm() {
    virt-install \
        --name=$VMNAME \
        --network network=default \
        --memory=$MEMORY --vcpus=$CPUS \
        --disk=$FILE --import \
        --graphics vnc \
        --noautoconsole
}

function get_ip() {
    IP=""
    until [ "$IP" ]; do
        IP=$(virsh net-dhcp-leases default \
            | awk "{if (\$6 == \"$VMNAME\") print \$5}" \
            | cut -d "/" -f 1)
    done
    echo $IP
}

apt_cacher
grml_debootstrap
install_vm
echo "virsh start $VMNAME; ssh root@$(get_ip), password: $PASSWORD"