From 21420f6c730fb7e4063cddd28de3e7580c6efb36 Mon Sep 17 00:00:00 2001
From: jfwood <john.wood@rackspace.com>
Date: Tue, 11 Feb 2014 22:39:51 -0600
Subject: [PATCH] Add script to ensure semantic versions work with continuous
 build.

This module generates and inserts a patch component of the semantic version
stamp for Barbican, intended to ensure that a strictly monotonically increasing
version is produced for consecutive development releases. Some repositories
such as yum use this increasing semantic version to select the latest
package for installations.

This process may not be required if a bug in the 'pbr' library is fixed:
https://bugs.launchpad.net/pbr/+bug/1206730

Change-Id: I19623d76b161331c2033ea129e7f3f67518520fa
---
 bin/versionbuild.py | 82 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100755 bin/versionbuild.py

diff --git a/bin/versionbuild.py b/bin/versionbuild.py
new file mode 100755
index 000000000..e1c35c457
--- /dev/null
+++ b/bin/versionbuild.py
@@ -0,0 +1,82 @@
+#!/usr/bin/env python
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright (c) 2013-2014 Rackspace, Inc.
+#
+# 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.
+
+"""
+Version build stamping script.
+
+This module generates and inserts a patch component of the semantic version
+stamp for Barbican, intended to ensure that a strictly monotonically increasing
+version is produced for consecutive development releases. Some repositories
+such as yum use this increasing semantic version to select the latest
+package for installations.
+
+This process may not be required if a bug in the 'pbr' library is fixed:
+https://bugs.launchpad.net/pbr/+bug/1206730
+"""
+import os
+
+from datetime import datetime
+from time import mktime
+
+
+# Determine version of this application.
+SETUP_FILE = 'setup.cfg'
+VERSIONFILE = os.path.join(SETUP_FILE)
+current_dir = os.getcwd()
+if current_dir.endswith('bin'):
+    VERSIONFILE = os.path.join('..', SETUP_FILE)
+
+
+def get_patch():
+    """Return a strictly monotonically increasing version patch.
+
+    This method is providing the 'patch' component of the semantic version
+    stamp for Barbican. It currently returns an epoch in seconds, but
+    could use a build id from the build system.
+    """
+    dt = datetime.now()
+    return int(mktime(dt.timetuple()))
+
+
+def update_versionfile(patch):
+    """Update the 'patch' version information per the provided patch."""
+    temp_name = VERSIONFILE + '~'
+    file_new = open(temp_name, 'w')
+    try:
+        with open(VERSIONFILE, 'r') as file_old:
+            for line in file_old:
+                if line.startswith('version ='):
+                    subs = line.split('.')
+                    if len(subs) <= 2:
+                        file_new.write(''.join([line[:-1], '.',
+                                                str(patch), '\n']))
+                    else:
+                        subs[2] = str(patch)
+                        file_new.write('.'.join(subs))
+                        if len(subs) == 3:
+                            file_new.write('\n')
+                else:
+                    file_new.write(line)
+    finally:
+        file_new.close()
+        os.rename(temp_name, VERSIONFILE)
+
+if __name__ == '__main__':
+    patch = get_patch()
+    print 'patch: ', patch
+    update_versionfile(patch)