Move scripts of building rpm to os-xenapi

This patch is to move scripts that build OpenStack dom0 plugins
into os-xenapi repo as we have changed nova to use os-xenapi
and we are changing neutron to use os-xenapi.

ATM, there are two places that contain building rpm scripts:
1. https://github.com/citrix-openstack/xenserver-nova-suppack-builder
2. https://github.com/openstack/neutron/tree/master/neutron/plugins/
ml2/drivers/openvswitch/agent/xenapi

For neutron, I have a patch to make it use os-xenapi, see
https://review.openstack.org/#/c/402330/

Change-Id: Ibdc17c436e794b474c72f6a5f4686b3a77c58aa2

Makefile

@@ -0,0 +1,31 @@
+
+THIS_DIR=$(shell pwd)
+RPMBUILD_DIR=${THIS_DIR}/os_xenapi/dom0/rpmbuild
+PACKAGE=xenapi-plugins
+VERSION_FILE=${THIS_DIR}/os_xenapi/dom0/etc/xapi.d/plugins/dom0_plugin_version.py
+VERSION=$(shell awk '/PLUGIN_VERSION = / {gsub(/"/, ""); print $$3}' ${VERSION_FILE})
+
+RPM_NAME=${PACKAGE}-${VERSION}-1.noarch.rpm
+
+rpm: ${THIS_DIR}/output/${RPM_NAME}
+
+${THIS_DIR}/output/${RPM_NAME}:
+	mkdir -p ${THIS_DIR}/output
+	mkdir -p ${RPMBUILD_DIR}
+	@for dir in BUILD BUILDROOT SRPMS RPMS SPECS SOURCES; do \
+	    rm -rf ${RPMBUILD_DIR}/$$dir; \
+	    mkdir -p ${RPMBUILD_DIR}/$$dir; \
+	done
+	cp ${THIS_DIR}/os_xenapi/dom0/${PACKAGE}.spec ${RPMBUILD_DIR}/SPECS
+	rm -rf /tmp/${PACKAGE}
+	mkdir /tmp/${PACKAGE}
+	cp -r ${THIS_DIR}/os_xenapi/dom0/etc/xapi.d /tmp/${PACKAGE}
+	tar czf ${RPMBUILD_DIR}/SOURCES/${PACKAGE}-${VERSION}.tar.gz -C /tmp ${PACKAGE}
+	rpmbuild -ba --nodeps --define "_topdir ${RPMBUILD_DIR}" --define "version ${VERSION}" ${RPMBUILD_DIR}/SPECS/${PACKAGE}.spec
+	mv ${RPMBUILD_DIR}/RPMS/noarch/* ${THIS_DIR}/output
+
+
+.PHONY: clean
+
+clean:
+	rm -rf ${RPMBUILD_DIR}

os_xenapi/dom0/README

@@ -5,4 +5,13 @@ If you install them manually, you will need to ensure that the newly
 added files are executable. You can do this by running the following
 command (from dom0):
 
-chmod a+x /etc/xapi.d/plugins/*
+    chmod a+x /etc/xapi.d/plugins/*
+
+Otherwise, you can build rpm package by running the following command:
+
+    cd $OS_XENAPI_ROOT
+    make rpm
+
+and install the package by running the following command in dom0:
+
+    rpm -i xenapi-plugins-*.noarch.rpm

os_xenapi/dom0/xenapi-plugins.spec

@@ -0,0 +1,64 @@
+Name:           xenapi-plugins
+Version:        %{version}
+Release:        1
+Summary:        Files for XenAPI support.
+License:        ASL 2.0
+Group:          Applications/Utilities
+Source0:        xenapi-plugins-%{version}.tar.gz
+BuildArch:      noarch
+BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
+
+%define debug_package %{nil}
+
+%description
+This package contains files that are required for XenAPI support for OpenStack.
+
+%prep
+%setup -q -n xenapi-plugins
+
+%install
+rm -rf $RPM_BUILD_ROOT
+mkdir -p $RPM_BUILD_ROOT/etc
+rsync -avz --exclude '*.pyc' --exclude '*.pyo' xapi.d $RPM_BUILD_ROOT/etc
+chmod a+x $RPM_BUILD_ROOT/etc/xapi.d/plugins/*
+
+%clean
+rm -rf $RPM_BUILD_ROOT
+
+%post
+set -eu
+default_sr="$(xe pool-list params=default-SR minimal=true)"
+if [ -z "$default_sr" ]; then
+    echo "Failed to get the default SR" >&2
+    exit 1
+fi
+sr_mount_dir="/var/run/sr-mount/$default_sr"
+if ! [ -d "$sr_mount_dir" ]; then
+    echo "Cannot find the folder that sr mount" >&2
+    exit 0
+fi
+
+if ! [ -d /images ]; then
+    os_images_dir="$sr_mount_dir/os-images"
+
+    echo "Creating /images" >&2
+    if ! [ -d "$os_images_dir" ]; then
+        echo "Creating $os_images_dir" >&2
+        mkdir -p "$os_images_dir"
+    fi
+
+    echo "Setting up symlink: /images -> $os_images_dir" >&2
+    ln -s "$os_images_dir" /images
+fi
+
+images_dev=$(stat -c %d "/images/")
+sr_dev=$(stat -c %d "$sr_mount_dir/")
+
+if [ "$images_dev" != "$sr_dev" ]; then
+    echo "ERROR: /images/ and the default SR are on different devices"
+    exit 1
+fi
+
+%files
+%defattr(-,root,root,-)
+/etc/xapi.d/plugins/*