scripts to build a ubuntu qcow2 root image for kvm

build.ubuntu.vmimg/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
+VAGRANTFILE_API_VERSION = "2"
+
+SETUP_BASE = <<-EOF
+
+echo "UseDNS no" >> /etc/ssh/sshd_config
+service ssh restart
+
+function detect_local_mirror () {
+    AL="$(avahi-browse -p -t -r _ubuntumirror._tcp | grep '^=' | head -1)"
+    if [ -n "$AL" ]; then
+        NAME="$(echo \"$AL\" | cut -d';' -f 8)"
+        PORT="$(echo \"$AL\" | cut -d';' -f 9)"
+        UM="http://${NAME}:${PORT}/ubuntu/"
+        MOK="$(curl --head \"${UM}ls-lR.gz\" 2>&1 | grep '200 OK' | wc -l)"
+        if [ $MOK -gt 0 ]; then
+            echo "$UM"
+        fi
+    fi
+}
+
+function set_apt_mirror () {
+    CN="$(lsb_release -c -s)"
+    RPS="main restricted multiverse universe"
+    echo "deb $1 $CN $RPS" > /etc/apt/sources.list.new
+    for P in updates backports security ; do
+        echo "deb $1 $CN-$P $RPS" >> /etc/apt/sources.list.new
+    done
+    mv /etc/apt/sources.list.new /etc/apt/sources.list
+}
+
+
+set_apt_mirror "mirror://mirrors.ubuntu.com/mirrors.txt"
+apt-get update
+apt-get -y install avahi-utils jq curl
+
+UM="$(detect_local_mirror)"
+if [ -n "$UM" ]; then
+    echo "Detected LAN ubuntu mirror at $UM - configuring!"
+    set_apt_mirror "$UM"
+fi
+echo "**********************************************************"
+echo "**********************************************************"
+cat /etc/apt/sources.list
+echo "**********************************************************"
+echo "**********************************************************"
+apt-get update
+apt-get -y install kpartx debootstrap lvm2 qemu-utils 
+EOF
+
+
+Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
+  config.vm.box = "ubuntu-12.04"
+  config.vm.box_url = "http://cloud-images.ubuntu.com/vagrant/precise/" + \
+    "current/precise-server-cloudimg-amd64-vagrant-disk1.box"
+  config.vm.network "public_network", :bridge => "en4: Display Ethernet"
+  config.vm.provision "shell", inline: SETUP_BASE
+  config.vm.provision "shell", path: "buildimage.sh"
+  config.vm.provider :virtualbox do |vb|
+    vb.customize ["modifyvm", :id, "--memory", "2048"]
+  end
+end