Integrate os-refresh-config with heat-cfntools

* Provide entry point for Heat Metadata to drive os-refresh-config
* Use os-config-applier for configuring heat cfn tools

Change-Id: Ie38b932173948f1e7c414c48caa1b037916bef84

elements/heat-cfntools/element-deps

@@ -1,2 +1,2 @@
-heat-cfntools
 os-config-applier
+os-refresh-config

elements/heat-cfntools/os-config-applier/etc/cfn/cfn-hup.conf

@@ -0,0 +1,5 @@
+[main]
+stack={{heat.stack.name}}
+credential-file=/var/lib/cloud/data/cfn-credentials
+region={{heat.stack.region}}
+interval=10

elements/heat-cfntools/os-config-applier/etc/cfn/hooks.conf

@@ -0,0 +1,8 @@
+{{#heat.refresh}}
+[os-refresh-config-{{resource}}]
+triggers=post.add,post.delete.post.update
+path=Resources.{{resource}}.Metadata
+action=os-refresh-config
+runas=root
+
+{{/heat.refresh}}

elements/os-refresh-config/README.md

@@ -14,3 +14,19 @@ it into one of the following directories:
 /opt/stack/os-refresh-config/migration.d
 /opt/stack/os-refresh-config/post-configure.d
 ```
+
+If you want to have os-refresh-config run on any updates to a particular
+Resource in the heat stack, you will need at the minimum the following snippet
+of json in this instance's Metadata:
+
+{
+  "OpenStack::Config": {
+    "heat":
+      "access_key_id": {"Ref": "ApiKeyResource"},
+      "secret_key": {"Fn::GetAtt": [ "ApiKeyResource", "SecretAccessKey" ]},
+      "refresh": [ {"resource": "SomeResource"} ],
+      "stack": {Ref: 'AWS::Stack'},
+      "region": {Ref: 'AWS::Region'}
+    }
+  }
+}

elements/os-refresh-config/install.d/60-os-refresh-config-hup

@@ -1,8 +0,0 @@
-#!/bin/bash
-# Note that this install.d script must be run after os-config-applier's
-# install script so that we can make use of os-config-apply
-set -eu
-script_home=$(dirname $0)
-template_home=$(os-config-applier --print-templates)/etc/cfn
-install -o root -g root -m 0644 -D $script_home/cfn-hup.conf $template_home/cfn-hup.conf
-install -o root -g root -m 0644 -D $script_home/hooks.conf $template_home/hooks.d/os-refresh-config.conf

elements/os-refresh-config/install.d/cfn-hup.conf

@@ -1,5 +0,0 @@
-[main]
-stack={{OpenStack::Heat::Stack.Name}}
-credential-file=/var/lib/cloud/data/cfn-credentials
-region={{OpenStack::Heat::Stack.Region}}
-interval=10

elements/os-refresh-config/install.d/hooks.conf

@@ -1,5 +0,0 @@
-[os-refresh-config]
-triggers=post.add,post.delete.post.update
-path=Resources.{{OpenStack::Heat::Stack.RefreshResource}}.Metadata
-action=os-refresh-config
-runas=root