Add os-disk-config element and image

Initial version of the os-disk-config element and an image target
to allow building a minimal image for testing and demo purposes.

None of this has been tested yet, but the image build completes
successfully so it should be a starting point anyway.

elements/os-disk-config/element-deps

@@ -0,0 +1,2 @@
+os-apply-config
+os-refresh-config

elements/os-disk-config/environment.d/10-os-disk-config-install-options.bash

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+export DIB_INSTALLTYPE_os_disk_config="${DIB_INSTALLTYPE_os_cloud_config:-"source"}"
+
+if [ -z "${OS_DISK_CONFIG_VENV_DIR:-}" ]; then
+    export OS_DISK_CONFIG_VENV_DIR="${OPENSTACK_VENV_DIR:-"/opt/stack/venvs/os-disk-config"}"
+fi

elements/os-disk-config/install.d/10-os-disk-config

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -eux
+set -o pipefail
+
+virtualenv --setuptools ${OS_DISK_CONFIG_VENV_DIR}
+set +u
+source ${OS_DISK_CONFIG_VENV_DIR}/bin/activate
+set -u
+
+# bug #1201253 : virtualenv-1.10.1 embeds setuptools-0.9.8, which
+# doesn't manage correctly HTTPS sockets when downloading pbr from
+# https://pypi.python.org/simple/ if using http_proxy and https_proxy
+# envvars
+${OS_DISK_CONFIG_VENV_DIR}/bin/pip install -U 'setuptools>=1.0'
+# bug #1293812 : Avoid easy_install triggering on pbr.
+${OS_DISK_CONFIG_VENV_DIR}/bin/pip install -U 'pbr>=0.6,<1.0'
+if [ -e /opt/stack/os-disk-config/requirements.txt ]; then
+    reqs=/opt/stack/os-disk-config/requirements.txt
+else
+    reqs=""
+fi
+if [ -n "$reqs" ] ; then
+    pip install -r $reqs
+fi
+
+pip install /opt/stack/os-disk-config
+
+set +u
+deactivate
+set -u
+
+ln -s ${OS_DISK_CONFIG_VENV_DIR}/bin/os-disk-config /usr/local/bin/

elements/os-disk-config/source-repository-os-disk-config

@@ -0,0 +1 @@
+os-disk-config git /opt/stack/os-disk-config https://github.com/agroup/os-disk-config

scripts/instack-build-images

@@ -251,6 +251,19 @@ function openstack-full {
     fi
 }
 
+function os-disk-config {
+    # Super basic image including os-disk-config for demonstrating its functionality
+    if [ ! -f os-disk-config.qcow2 ]; then
+        unset DIB_COMMON_ELEMENTS
+        disk-image-create \
+            -a $NODE_ARCH \
+            -o os-disk-config \
+            $NODE_DIST \
+            os-disk-config baremetal \
+            2>&1 | tee dib-os-disk-config.log
+    fi
+}
+
 if [ "$image_build" = "all" ]; then
     deploy-ramdisk
     discovery-ramdisk