From 7b76ebb85d94d6fc4ccfae35264e0e6ceab5c821 Mon Sep 17 00:00:00 2001
From: Frode Nordahl <frode.nordahl@canonical.com>
Date: Wed, 24 Mar 2021 15:30:52 +0100
Subject: [PATCH] Add method for publishing releases packages map

Related-Bug: #1806111
Change-Id: Ice633e5a4011218f20a112968427fbf3fd5a0f7f
---
 provides.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/provides.py b/provides.py
index 062f23d..cd338be 100644
--- a/provides.py
+++ b/provides.py
@@ -6,6 +6,8 @@ from charms.reactive import RelationBase
 from charms.reactive import hook
 from charms.reactive import scopes
 
+import charmhelpers.core.hookenv as hookenv
+
 
 class CinderBackendProvides(RelationBase):
 
@@ -52,3 +54,18 @@ class CinderBackendProvides(RelationBase):
             backend_name=backend_name,
             stateless=stateless,
             subordinate_configuration=json.dumps(subordinate_configuration))
+
+    def publish_releases_packages_map(self, releases_packages_map):
+        """Publish releases_packages_map.
+
+        :param releases_packages_map: Map of releases and packages
+        :type releases_packages_map: Dict[str,Dict[str,List[str]]]
+        """
+        # NOTE: To allow relation updates outside of relation hook execution,
+        # e.g. upgrade-charm hook, we need to revert to classic hookenv tools.
+        for rid in hookenv.relation_ids(self.relation_name):
+            relation_info = {
+                'releases-packages-map': json.dumps(
+                    releases_packages_map, sort_keys=True)
+            }
+            hookenv.relation_set(rid, relation_info)