merge.py

   1 import sys
   2 import yaml
   3
   4 templates = list(sys.argv[1:])
   5
   6 errors = []
   7 end_template={'HeatTemplateFormatVersion': '2012-12-12',
   8               'Description': []}
   9 resource_changes=[]
  10 for template_path in templates:
  11     template = yaml.safe_load(open(template_path))
  12     end_template['Description'].append(template.get('Description',
  13                                                     template_path))
  14     new_parameters = template.get('Parameters', {})
  15     for p, pbody in iter(new_parameters.items()):
  16         if p in end_template.get('Parameters', {}):
  17             if pbody != end_template['Parameters'][p]:
  18                 errors.append('Parameter %s from %s conflicts.' % (p,
  19                                                                    template_path))
  20             continue
  21         if 'Parameters' not in end_template:
  22             end_template['Parameters'] = {}
  23         end_template['Parameters'][p] = pbody
  24
  25     new_outputs = template.get('Outputs', {})
  26     for o, obody in iter(new_outputs.items()):
  27         if o in end_template.get('Outputs', {}):
  28             if pbody != end_template['Outputs'][p]:
  29                 errors.append('Output %s from %s conflicts.' % (o,
  30                                                                    template_path))
  31             continue
  32         if 'Outputs' not in end_template:
  33             end_template['Outputs'] = {}
  34         end_template['Outputs'][o] = obody
  35
  36     new_resources = template.get('Resources', {})
  37     for r, rbody in iter(new_resources.items()):
  38         if rbody['Type'] == 'AWS::EC2::Instance':
  39             # XXX Assuming ImageId is always a Ref
  40             del end_template['Parameters'][rbody['Properties']['ImageId']['Ref']]
  41             role = rbody.get('Metadata', {}).get('OpenStack::Role', r)
  42             if role != r:
  43                 resource_changes.append((r, role))
  44             if role in end_template.get('Resources', {}):
  45                 new_metadata = rbody.get('Metadata', {})
  46                 for m, mbody in iter(new_metadata.items()):
  47                     if m in end_template['Resources'][role].get('Metadata', {}):
  48                         if m == 'OpenStack::ImageBuilder::Elements':
  49                             end_template['Resources'][role]['Metadata'][m].extend(mbody)
  50                             continue
  51                         if mbody != end_template['Resources'][role]['Metadata'][m]:
  52                             errors.append('Role %s metadata key %s conflicts.' %
  53                                           (role, m))
  54                         continue
  55                     end_template['Resources'][role]['Metadata'][m] = mbody
  56                 continue
  57             if 'Resources' not in end_template:
  58                 end_template['Resources'] = {}
  59             end_template['Resources'][role] = rbody
  60             ikey = '%sImage' % (role)
  61             end_template['Resources'][role]['Properties']['ImageId'] = {'Ref': ikey}
  62             end_template['Parameters'][ikey] = {'Type': 'String'}
  63         else:
  64             if r in end_template.get('Resources', {}):
  65                 if rbody != end_template['Resources'][r]:
  66                     errors.append('Resource %s from %s conflicts' % (r,
  67                                                                      template_path))
  68                 continue
  69             if 'Resources' not in end_template:
  70                 end_template['Resources'] = {}
  71             end_template['Resources'][r] = rbody
  72
  73 def fix_ref(item, old, new):
  74     if isinstance(item, dict):
  75         copy_item = dict(item)
  76         for k, v in iter(copy_item.items()):
  77             if k == 'Ref' and v == old:
  78                 item[k] = new
  79                 continue
  80             if k == 'DependsOn' and v == old:
  81                 item[k] = new
  82                 continue
  83             if k == 'Fn::GetAtt' and isinstance(v, list) and v[0] == old:
  84                 new_list = list(v)
  85                 new_list[0] = new
  86                 item[k] = new_list
  87                 continue
  88             if k == 'AllowedResources' and isinstance(v, list) and old in v:
  89                 while old in v:
  90                     pos = v.index(old)
  91                     v[pos] = new
  92                 continue
  93             fix_ref(v, old, new)
  94     elif isinstance(item, list):
  95         copy_item = list(item)
  96         for v in item:
  97             fix_ref(v, old, new)
  98
  99 for change in resource_changes:
 100     fix_ref(end_template, change[0], change[1])
 101
 102 if errors:
 103     for e in errors:
 104         sys.stderr.write("ERROR: %s\n" % e)
 105 end_template['Description'] = ','.join(end_template['Description'])
 106 sys.stdout.write(yaml.safe_dump(end_template, default_flow_style=False))