Make LaunchConfiguration resources mergeable

This can be very useful for merging of Metadata to be used
by optional services (e. g. to add services like tuskar to
undercloud on demand).

Change-Id: Ifc4016d6e994064c0772c12e668e98bf055fada9

examples/launchconfig1.yaml

@@ -0,0 +1,23 @@
+Parameters:
+  A:
+    Type: String
+    Default: test1
+  B:
+    Type: String
+    Default: test2
+  resource1Image:
+    Type: String
+    Default: resource1
+Resources:
+  notcomputeConfigBase:
+    Type: AWS::AutoScaling::LaunchConfiguration
+    Metadata:
+      OpenStack::Role: notcomputeConfig
+      a: {Ref: A}
+      b: {Ref: B}
+  resource1:
+    Type: OS::Nova::Server
+    Properties:
+      flavor: test_flavor
+      image: {Ref: resource1Image}
+      key_name: test_key

examples/launchconfig2.yaml

@@ -0,0 +1,19 @@
+Parameters:
+  C:
+    Type: String
+    Default: test3
+  resource2Image:
+    Type: String
+    Default: resource2
+Resources:
+  notcomputeConfigMixin:
+    Type: AWS::AutoScaling::LaunchConfiguration
+    Metadata:
+      OpenStack::Role: notcomputeConfig
+      c: {Ref: C}
+  resource2:
+    Type: OS::Nova::Server
+    Properties:
+      flavor: test_flavor
+      image: {Ref: resource2Image}
+      key_name: test_key

examples/launchconfig_result.yaml

@@ -0,0 +1,43 @@
+Description: examples/launchconfig1.yaml,examples/launchconfig2.yaml
+HeatTemplateFormatVersion: '2012-12-12'
+Parameters:
+  A:
+    Default: test1
+    Type: String
+  B:
+    Default: test2
+    Type: String
+  C:
+    Default: test3
+    Type: String
+  resource1Image:
+    Default: resource1
+    Type: String
+  resource2Image:
+    Default: resource2
+    Type: String
+Resources:
+  notcomputeConfig:
+    Metadata:
+      OpenStack::Role: notcomputeConfig
+      a:
+        Ref: A
+      b:
+        Ref: B
+      c:
+        Ref: C
+    Type: AWS::AutoScaling::LaunchConfiguration
+  resource1:
+    Properties:
+      flavor: test_flavor
+      image:
+        Ref: resource1Image
+      key_name: test_key
+    Type: OS::Nova::Server
+  resource2:
+    Properties:
+      flavor: test_flavor
+      image:
+        Ref: resource2Image
+      key_name: test_key
+    Type: OS::Nova::Server

merge.py

@@ -48,6 +48,8 @@ MERGABLE_TYPES = {'OS::Nova::Server':
                   {'image': 'image'},
                   'AWS::EC2::Instance':
                   {'image': 'ImageId'},
+                  'AWS::AutoScaling::LaunchConfiguration':
+                  {},
                  }
 
 
@@ -119,10 +121,11 @@ for template_path in templates:
     new_resources = template.get('Resources', {})
     for r, rbody in sorted(new_resources.items()):
         if rbody['Type'] in MERGABLE_TYPES:
-            image_key = MERGABLE_TYPES[rbody['Type']]['image']
+            if 'image' in MERGABLE_TYPES[rbody['Type']]:
-            # XXX Assuming ImageId is always a Ref
+                image_key = MERGABLE_TYPES[rbody['Type']]['image']
-            ikey_val = end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
+                # XXX Assuming ImageId is always a Ref
-            del end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
+                ikey_val = end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
+                del end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
             role = rbody.get('Metadata', {}).get('OpenStack::Role', r)
             role = translate_role(role)
             if role != r:
@@ -143,9 +146,10 @@ for template_path in templates:
             if 'Resources' not in end_template:
                 end_template['Resources'] = {}
             end_template['Resources'][role] = rbody
-            ikey = '%sImage' % (role)
+            if 'image' in MERGABLE_TYPES[rbody['Type']]:
-            end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
+                ikey = '%sImage' % (role)
-            end_template['Parameters'][ikey] = ikey_val
+                end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
+                end_template['Parameters'][ikey] = ikey_val
         elif rbody['Type'] == 'FileInclude':
             with open(rbody['Path']) as rfile:
                 include_content = yaml.safe_load(rfile.read())

test_merge.bash

@@ -26,6 +26,7 @@ echo
 run_test "python merge.py examples/source.yaml" examples/source_lib_result.yaml
 run_test "python merge.py examples/source2.yaml" examples/source2_lib_result.yaml
 run_test "python merge.py examples/source_include_subkey.yaml" examples/source_include_subkey_result.yaml
+run_test "python merge.py examples/launchconfig1.yaml examples/launchconfig2.yaml" examples/launchconfig_result.yaml
 echo
 trap - EXIT
 exit $fail