Script to create a box out of a qcow2 file.

tools/create_box.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+
+error() {
+    local msg="${1}"
+    echo "==> ${msg}"
+    exit 1
+}
+
+usage() {
+    echo "Usage: ${0} IMAGE [BOX]"
+    echo
+    echo "Package a qcow2 image into a vagrant-libvirt reusable box"
+}
+
+# Print the image's backing file
+backing(){
+    local img=${1}
+    qemu-img info $img | grep 'backing file:' | cut -d ':' -f2
+}
+
+# Rebase the image
+rebase(){
+    local img=${1}
+    qemu-img rebase -p -b "" $img
+    [[ "$?" -ne 0 ]] && error "Error during rebase"
+}
+
+if [ -z "$1" ]; then
+    usage
+    exit 1
+fi
+
+IMG=$(readlink -e $1)
+[[ "$?" -ne 0 ]] && error "'$2': No such image"
+
+IMG_DIR=$(dirname $IMG)
+IMG_BASENAME=$(basename $IMG)
+
+# If no box name is supplied infer one from image name
+if [[ -z "$2" ]]; then
+    BOX_NAME=${IMG_BASENAME%.*}
+    BOX=$BOX_NAME.box
+else
+    BOX="$2"
+    BOX_NAME=${BOX%.*}
+fi
+
+[[ -f "$BOX" ]] && error "'$BOX': Already exists"
+
+CWD=$(pwd)
+TMP_DIR=$CWD/_tmp_package
+TMP_IMG=$TMP_DIR/box.img
+
+mkdir -p $TMP_DIR
+
+# We move / copy (when the image has master) the image to the tempdir
+# ensure that it's moved back / removed again
+if [[ -n $(backing $IMG) ]]; then
+    echo "==> Image has backing image, copying image and rebasing ..."
+    trap "rm -rf $TMP_DIR" EXIT
+    cp $IMG $TMP_IMG
+    rebase $TMP_IMG
+else
+    trap "mv $TMP_IMG $IMG; rm -rf $TMP_DIR" EXIT
+    mv $IMG $TMP_IMG
+fi
+
+cd $TMP_DIR
+
+IMG_SIZE=$(qemu-img info $TMP_IMG | grep 'virtual size' | awk '{print $3;}' | tr -d 'G')
+
+cat > metadata.json <<EOF
+{
+    "provider": "libvirt",
+    "format": "qcow2",
+    "virtual_size": ${IMG_SIZE}
+}
+EOF
+
+cat > Vagrantfile <<EOF
+Vagrant.configure("2") do |config|
+
+  config.vm.provider :libvirt do |libvirt|
+
+    libvirt.driver = "kvm"
+    libvirt.host = ""
+    libvirt.connect_via_ssh = false
+    libvirt.storage_pool_name = "default"
+
+  end
+end
+EOF
+
+echo "==> Creating box, tarring and gzipping"
+
+tar cvzf $BOX --totals ./metadata.json ./Vagrantfile ./box.img
+mv $BOX $CWD
+
+echo "==> ${CWD}/${BOX} created"
+echo "==> You can now add the box:"
+echo "==>   'vagrant box add ${BOX} --name ${BOX_NAME}'"