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-rw-r--r--tripleo_heat_merge/merge.py224
1 files changed, 224 insertions, 0 deletions
diff --git a/tripleo_heat_merge/merge.py b/tripleo_heat_merge/merge.py
new file mode 100644
index 00000000..053a683a
--- /dev/null
+++ b/tripleo_heat_merge/merge.py
@@ -0,0 +1,224 @@
+import os
+import sys
+import yaml
+import argparse
+
+
+def _translate_role(role, master_role, slave_roles):
+ if not master_role:
+ return role
+ if role == master_role:
+ return role
+ if role not in slave_roles:
+ return role
+ return master_role
+
+def translate_role(role, master_role, slave_roles):
+ r = _translate_role(role, master_role, slave_roles)
+ if not isinstance(r, basestring):
+ raise Exception('%s -> %r' % (role, r))
+ return r
+
+def resolve_params(item, param, value):
+ if item == {'Ref': param}:
+ return value
+ if isinstance(item, dict):
+ copy_item = dict(item)
+ for k, v in iter(copy_item.items()):
+ item[k] = resolve_params(v, param, value)
+ elif isinstance(item, list):
+ copy_item = list(item)
+ new_item = []
+ for v in copy_item:
+ new_item.append(resolve_params(v, param, value))
+ item = new_item
+ return item
+
+MERGABLE_TYPES = {'OS::Nova::Server':
+ {'image': 'image'},
+ 'AWS::EC2::Instance':
+ {'image': 'ImageId'},
+ 'AWS::AutoScaling::LaunchConfiguration':
+ {},
+ }
+INCLUDED_TEMPLATE_DIR = os.getcwd()
+
+
+def resolve_includes(template, params=None):
+ new_template = {}
+ if params is None:
+ params = {}
+ for key, value in iter(template.items()):
+ if key == '__include__':
+ new_params = dict(params) # do not propagate up the stack
+ if not isinstance(value, dict):
+ raise ValueError('__include__ must be a mapping')
+ if 'path' not in value:
+ raise ValueError('__include__ must have path')
+ if 'params' in value:
+ if not isinstance(value['params'], dict):
+ raise ValueError('__include__ params must be a mapping')
+ new_params.update(value['params'])
+ with open(value['path']) as include_file:
+ sub_template = yaml.safe_load(include_file.read())
+ if 'subkey' in value:
+ if ((not isinstance(value['subkey'], int)
+ and not isinstance(sub_template, dict))):
+ raise RuntimeError('subkey requires mapping root or'
+ ' integer for list root')
+ sub_template = sub_template[value['subkey']]
+ for k, v in iter(new_params.items()):
+ sub_template = resolve_params(sub_template, k, v)
+ new_template.update(resolve_includes(sub_template))
+ else:
+ if isinstance(value, dict):
+ new_template[key] = resolve_includes(value)
+ else:
+ new_template[key] = value
+ return new_template
+
+def main(argv=None):
+ if argv is None:
+ argv = sys.argv[1:]
+ parser = argparse.ArgumentParser()
+ parser.add_argument('templates', nargs='+')
+ parser.add_argument('--master-role', nargs='?',
+ help='Translate slave_roles to this')
+ parser.add_argument('--slave-roles', nargs='*',
+ help='Translate all of these to master_role')
+ parser.add_argument('--included-template-dir', nargs='?',
+ default=INCLUDED_TEMPLATE_DIR,
+ help='Path for resolving included templates')
+ args = parser.parse_args(argv)
+ templates = args.templates
+ merged_template = merge(templates, args.master_role, args.slave_roles,
+ args.included_template_dir)
+ sys.stdout.write(merged_template)
+
+def merge(templates, master_role=None, slave_roles=None,
+ included_template_dir=INCLUDED_TEMPLATE_DIR):
+ errors = []
+ end_template={'HeatTemplateFormatVersion': '2012-12-12',
+ 'Description': []}
+ resource_changes=[]
+ for template_path in templates:
+ template = yaml.safe_load(open(template_path))
+ # Resolve __include__ tags
+ template = resolve_includes(template)
+ end_template['Description'].append(template.get('Description',
+ template_path))
+ new_parameters = template.get('Parameters', {})
+ for p, pbody in sorted(new_parameters.items()):
+ if p in end_template.get('Parameters', {}):
+ if pbody != end_template['Parameters'][p]:
+ errors.append('Parameter %s from %s conflicts.' % (p,
+ template_path))
+ continue
+ if 'Parameters' not in end_template:
+ end_template['Parameters'] = {}
+ end_template['Parameters'][p] = pbody
+
+ new_outputs = template.get('Outputs', {})
+ for o, obody in sorted(new_outputs.items()):
+ if o in end_template.get('Outputs', {}):
+ if pbody != end_template['Outputs'][p]:
+ errors.append('Output %s from %s conflicts.' % (o,
+ template_path))
+ continue
+ if 'Outputs' not in end_template:
+ end_template['Outputs'] = {}
+ end_template['Outputs'][o] = obody
+
+ new_resources = template.get('Resources', {})
+ for r, rbody in sorted(new_resources.items()):
+ if rbody['Type'] in MERGABLE_TYPES:
+ if 'image' in MERGABLE_TYPES[rbody['Type']]:
+ image_key = MERGABLE_TYPES[rbody['Type']]['image']
+ # XXX Assuming ImageId is always a 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, master_role, slave_roles)
+ if role != r:
+ resource_changes.append((r, role))
+ if role in end_template.get('Resources', {}):
+ new_metadata = rbody.get('Metadata', {})
+ for m, mbody in iter(new_metadata.items()):
+ if m in end_template['Resources'][role].get('Metadata', {}):
+ if m == 'OpenStack::ImageBuilder::Elements':
+ end_template['Resources'][role]['Metadata'][m].extend(mbody)
+ continue
+ if mbody != end_template['Resources'][role]['Metadata'][m]:
+ errors.append('Role %s metadata key %s conflicts.' %
+ (role, m))
+ continue
+ end_template['Resources'][role]['Metadata'][m] = mbody
+ continue
+ if 'Resources' not in end_template:
+ end_template['Resources'] = {}
+ end_template['Resources'][role] = rbody
+ if 'image' in MERGABLE_TYPES[rbody['Type']]:
+ ikey = '%sImage' % (role)
+ end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
+ end_template['Parameters'][ikey] = ikey_val
+ elif rbody['Type'] == 'FileInclude':
+ # we trust os.path.join to DTRT: if FileInclude path isn't
+ # absolute, join to included_template_dir (./)
+ with open(os.path.join(included_template_dir, rbody['Path'])) as rfile:
+ include_content = yaml.safe_load(rfile.read())
+ subkeys = rbody.get('SubKey','').split('.')
+ while len(subkeys) and subkeys[0]:
+ include_content = include_content[subkeys.pop(0)]
+ for replace_param, replace_value in iter(rbody.get('Parameters',
+ {}).items()):
+ include_content = resolve_params(include_content,
+ replace_param,
+ replace_value)
+ end_template['Resources'][r] = include_content
+ else:
+ if r in end_template.get('Resources', {}):
+ if rbody != end_template['Resources'][r]:
+ errors.append('Resource %s from %s conflicts' % (r,
+ template_path))
+ continue
+ if 'Resources' not in end_template:
+ end_template['Resources'] = {}
+ end_template['Resources'][r] = rbody
+
+ def fix_ref(item, old, new):
+ if isinstance(item, dict):
+ copy_item = dict(item)
+ for k, v in sorted(copy_item.items()):
+ if k == 'Ref' and v == old:
+ item[k] = new
+ continue
+ if k == 'DependsOn' and v == old:
+ item[k] = new
+ continue
+ if k == 'Fn::GetAtt' and isinstance(v, list) and v[0] == old:
+ new_list = list(v)
+ new_list[0] = new
+ item[k] = new_list
+ continue
+ if k == 'AllowedResources' and isinstance(v, list) and old in v:
+ while old in v:
+ pos = v.index(old)
+ v[pos] = new
+ continue
+ fix_ref(v, old, new)
+ elif isinstance(item, list):
+ copy_item = list(item)
+ for v in item:
+ fix_ref(v, old, new)
+
+ for change in resource_changes:
+ fix_ref(end_template, change[0], change[1])
+
+ if errors:
+ for e in errors:
+ sys.stderr.write("ERROR: %s\n" % e)
+ end_template['Description'] = ','.join(end_template['Description'])
+ return yaml.safe_dump(end_template, default_flow_style=False)
+
+if __name__ == "__main__":
+ main()