Support image type for guest image building

Change-Id: I8d640c47f00446d7f912ece9892b17585cde3add
(cherry picked from commit 428e3644f8)

doc/source/admin/building_guest_images.rst

@@ -141,7 +141,7 @@ The trove guest agent image could be created by running the following command:
       guest_os_release=xenial
       dev_mode=true
       guest_username=ubuntu
-      imagepath=$HOME/images/trove-${guest_os}-${guest_os_release}-${datastore_type}
+      imagepath=$HOME/images/trove-${guest_os}-${guest_os_release}-${datastore_type}.qcow2
 
 * ``dev_mode=true`` is mainly for testing purpose for trove developers and it's
   necessary to build the image on the trove controller host, because the host
@@ -165,6 +165,10 @@ The trove guest agent image could be created by running the following command:
     repository, by default it's master, use other branches as needed such as
     stable/train.
 
+* The image type can be easily changed by specifying a different image file
+  extension, e.g. to build a raw image, you can specify
+  ``$your-image-name.raw`` as the ``imagepath`` parameter.
+
 For example, in order to build a MySQL image for Ubuntu Xenial operating
 system in development mode:
 

integration/scripts/functions_qemu

@@ -13,13 +13,14 @@ function build_vm() {
     local dev_mode=$4
     local guest_username=$5
     local image_output=$6
+    local image_type=${image_output##*.}
+    local working_dir=$(dirname ${image_output})
 
     local elementes="base vm"
     local trove_elements_path=${PATH_TROVE}/integration/scripts/files/elements
     local GUEST_IMAGETYPE=${GUEST_IMAGETYPE:-"qcow2"}
     local GUEST_IMAGESIZE=${GUEST_IMAGESIZE:-4}
     local GUEST_CACHEDIR=${GUEST_CACHEDIR:-"$HOME/.cache/image-create"}
-    local working_dir=$(dirname ${image_output})
 
     export GUEST_USERNAME=${guest_username}
 
@@ -79,6 +80,7 @@ function build_vm() {
     disk-image-create -x \
       -a amd64 \
       -o ${image_output} \
+      -t ${image_type} \
       -t ${GUEST_IMAGETYPE} \
       --image-size ${GUEST_IMAGESIZE} \
       --image-cache ${GUEST_CACHEDIR} \

integration/scripts/trovestack

@@ -781,7 +781,7 @@ function cmd_build_image() {
     if [[ -z "$output" ]]; then
         image_name="trove-datastore-${IMAGE_GUEST_OS}-${IMAGE_GUEST_RELEASE}-${IMAGE_DATASTORE_TYPE}"
         image_folder=$HOME/images
-        output="${image_folder}/${image_name}"
+        output="${image_folder}/${image_name}.qcow2"
     fi
     # Always rebuild the image.
     sudo rm -f $output