From 046c1b17dfbcfef27de80c3cce37001069533432 Mon Sep 17 00:00:00 2001
From: Doug Hellmann <doug@doughellmann.com>
Date: Tue, 6 Oct 2015 13:47:39 +0000
Subject: [PATCH] show requirements changes

Add git diff output for requirements related files to show what
requirements actually changed over the span of the release, if any.

Change-Id: Id87c858897e75ddcee2150912d3e087743554585
---
 openstack_releases/cmds/list_changes.py | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/openstack_releases/cmds/list_changes.py b/openstack_releases/cmds/list_changes.py
index 959d6f0f0a..c2d1901541 100644
--- a/openstack_releases/cmds/list_changes.py
+++ b/openstack_releases/cmds/list_changes.py
@@ -19,6 +19,7 @@ from __future__ import print_function
 
 import argparse
 import atexit
+import glob
 import os
 import os.path
 import shutil
@@ -31,10 +32,13 @@ from openstack_releases import defaults
 from openstack_releases import gitutils
 
 
+def header(title):
+    print('\n%s' % title)
+    print('-' * len(title))
+
+
 def git_log(workdir, repo, title, git_range, extra_args=[]):
-    header = '%s %s' % (title, git_range)
-    print('\n%s' % header)
-    print('-' * len(header))
+    header('%s %s' % (title, git_range))
     cmd = ['git', 'log', '--no-color']
     cmd.extend(extra_args)
     cmd.append(git_range)
@@ -42,6 +46,18 @@ def git_log(workdir, repo, title, git_range, extra_args=[]):
     print()
 
 
+def git_diff(workdir, repo, git_range, file_pattern):
+    repo_dir = os.path.join(workdir, repo)
+    files = list(glob.glob(os.path.join(repo_dir,
+                                        file_pattern)))
+    if files:
+        header('Requirements Changes %s' % git_range)
+        cmd = ['git', 'diff', '-U0', '--no-color', git_range]
+        cmd.extend(f[len(repo_dir) + 1:] for f in files)
+        subprocess.check_call(cmd, cwd=repo_dir)
+        print()
+
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument(
@@ -136,6 +152,9 @@ def main():
             else:
                 git_range = project['hash']
 
+            # Show any requirements changes in the upcoming release.
+            git_diff(workdir, project['repo'], git_range, '*requirements*.txt')
+
             # Show the changes since the last release, first as a
             # graph view so we can check for bad merges, and then with
             # more detail.