add convenience script for finding unreleased stable branch changes

Change-Id: Idb31008f954793f8713440162410743083083db7

README.rst

@@ -298,6 +298,24 @@ Runs list_unreleased_changes.sh for all libraries managed by any
 project.
 
 
+list_stable_unreleased_changes.sh
+---------------------------------
+
+Runs list_unreleased_changes.sh with the given branch for all
+repositories tagged with ``stable:follows-policy``.
+
+
+::
+
+  ./list_stable_unreleased_changes.sh stable/liberty
+
+
+is equivalent to:
+
+::
+
+  ./list_unreleased_changes.sh stable/liberty $(list-repos --tag stable:follows-policy)
+
 make_stable_branch.sh
 ---------------------
 

list_stable_unreleased_changes.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+#
+# Convenience wrapper to show the unreleased changes in all projects
+# claiming to have stable branches, so we don't have to remember the
+# incantation.
+
+if [[ $# -ne 1 ]]; then
+    echo "Usage: $(basename $0) <branch>"
+    exit 1
+fi
+
+if [[ -z "$VIRTUAL_ENV" ]]; then
+    tox -e venv --notest
+    source ./.tox/venv/bin/activate
+fi
+
+repos="$(list-repos --tag stable:follows-policy)"
+
+# NOTE(tonyb): The purpose of this script is to 'quick check' for unreleased
+# changes.  Without an email address release-notes will barf so set a fake
+# email address if one isn't already present.
+export EMAIL=${EMAIL:-noone@nowhere.com}
+$(dirname $0)/list_unreleased_changes.sh $1 $repos