Add XStatic version checking job

For testing the proposed version checking job
it is being added to the experimental queue.

This check will be run in the release job as a pre-check
to ensure that the tag triggering the release matches
the version encoded in the release's files. If the version
coded in the tag doesn't match the version in the xstatic
package, it must be rejected.

Co-Authored-By: Joshua Hesketh <josh@nitrotech.org>
Change-Id: I04765ccc8c3a72758391ab147e7d5d79b828fd21

jenkins/jobs/xstatic.yaml

@@ -0,0 +1,19 @@
+- job:
+    name: 'xstatic-check-version'
+    node: ubuntu-trusty
+
+    builders:
+      - revoke-sudo
+      - gerrit-git-prep
+      - shell: |
+          virtualenv .venv
+          source .venv/bin/activate
+          pip --version
+          # Install setuptools_scm pre-requisite
+          pip install setuptools_scm
+          # Check version match
+          /usr/local/jenkins/slave_scripts/xstatic_check_version.py
+          deactivate
+
+    publishers:
+      - console-log

jenkins/scripts/xstatic_check_version.py

@@ -0,0 +1,34 @@
+#! /usr/bin/env python
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import importlib
+import os
+import sys
+
+from setuptools_scm import get_version
+
+xs = None
+for name in os.listdir('xstatic/pkg'):
+    if os.path.isdir('xstatic/pkg/' + name):
+        if xs is not None:
+            sys.exit('More than one xstatic.pkg package found.')
+        xs = importlib.import_module('xstatic.pkg.' + name)
+
+if xs is None:
+    sys.exit('No xstatic.pkg package found.')
+
+git_version = get_version()
+if git_version != xs.PACKAGE_VERSION:
+    sys.exit('git tag version ({}) does not match package version ({})'.
+        format(git_version, xs.PACKAGE_VERSION))

zuul/layout.yaml

@@ -11064,6 +11064,8 @@ projects:
       - name: merge-check
       - name: noop-jobs
       - name: publish-to-pypi
+    experimental:
+      - xstatic-check-version
 
   - name: openstack/xstatic-angular-cookies
     template: