merge.py

   1 import sys
   2 import yaml
   3 import argparse
   4
   5 parser = argparse.ArgumentParser()
   6 parser.add_argument('templates', nargs='+')
   7 parser.add_argument('--master-role', nargs='?',
   8                     help='Translate slave_roles to this')
   9 parser.add_argument('--slave-roles', nargs='*',
  10                     help='Translate all of these to master_role')
  11
  12 args = parser.parse_args()
  13
  14 templates = args.templates
  15
  16 def _translate_role(role):
  17     global args
  18     if not args.master_role:
  19         return role
  20     if role == args.master_role:
  21         return role
  22     if role not in args.slave_roles:
  23         return role
  24     return args.master_role
  25
  26 def translate_role(role):
  27     r = _translate_role(role)
  28     if not isinstance(r, basestring):
  29         raise Exception('%s -> %r' % (role, r))
  30     return r
  31
  32 def resolve_params(item, param, value):
  33     if item == {'Ref': param}:
  34         return value
  35     if isinstance(item, dict):
  36         copy_item = dict(item)
  37         for k, v in iter(copy_item.items()):
  38             item[k] = resolve_params(v, param, value)
  39     elif isinstance(item, list):
  40         copy_item = list(item)
  41         new_item = []
  42         for v in copy_item:
  43             new_item.append(resolve_params(v, param, value))
  44         item = new_item
  45     return item
  46
  47 MERGABLE_TYPES = {'OS::Nova::Server':
  48                   {'image': 'image'},
  49                   'AWS::EC2::Instance':
  50                   {'image': 'ImageId'},
  51                  }
  52
  53 errors = []
  54 end_template={'HeatTemplateFormatVersion': '2012-12-12',
  55               'Description': []}
  56 resource_changes=[]
  57 for template_path in templates:
  58     template = yaml.safe_load(open(template_path))
  59     end_template['Description'].append(template.get('Description',
  60                                                     template_path))
  61     new_parameters = template.get('Parameters', {})
  62     for p, pbody in sorted(new_parameters.items()):
  63         if p in end_template.get('Parameters', {}):
  64             if pbody != end_template['Parameters'][p]:
  65                 errors.append('Parameter %s from %s conflicts.' % (p,
  66                                                                    template_path))
  67             continue
  68         if 'Parameters' not in end_template:
  69             end_template['Parameters'] = {}
  70         end_template['Parameters'][p] = pbody
  71
  72     new_outputs = template.get('Outputs', {})
  73     for o, obody in sorted(new_outputs.items()):
  74         if o in end_template.get('Outputs', {}):
  75             if pbody != end_template['Outputs'][p]:
  76                 errors.append('Output %s from %s conflicts.' % (o,
  77                                                                    template_path))
  78             continue
  79         if 'Outputs' not in end_template:
  80             end_template['Outputs'] = {}
  81         end_template['Outputs'][o] = obody
  82
  83     new_resources = template.get('Resources', {})
  84     for r, rbody in sorted(new_resources.items()):
  85         if rbody['Type'] in MERGABLE_TYPES:
  86             image_key = MERGABLE_TYPES[rbody['Type']]['image']
  87             # XXX Assuming ImageId is always a Ref
  88             ikey_val = end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
  89             del end_template['Parameters'][rbody['Properties'][image_key]['Ref']]
  90             role = rbody.get('Metadata', {}).get('OpenStack::Role', r)
  91             role = translate_role(role)
  92             if role != r:
  93                 resource_changes.append((r, role))
  94             if role in end_template.get('Resources', {}):
  95                 new_metadata = rbody.get('Metadata', {})
  96                 for m, mbody in iter(new_metadata.items()):
  97                     if m in end_template['Resources'][role].get('Metadata', {}):
  98                         if m == 'OpenStack::ImageBuilder::Elements':
  99                             end_template['Resources'][role]['Metadata'][m].extend(mbody)
 100                             continue
 101                         if mbody != end_template['Resources'][role]['Metadata'][m]:
 102                             errors.append('Role %s metadata key %s conflicts.' %
 103                                           (role, m))
 104                         continue
 105                     end_template['Resources'][role]['Metadata'][m] = mbody
 106                 continue
 107             if 'Resources' not in end_template:
 108                 end_template['Resources'] = {}
 109             end_template['Resources'][role] = rbody
 110             ikey = '%sImage' % (role)
 111             end_template['Resources'][role]['Properties'][image_key] = {'Ref': ikey}
 112             end_template['Parameters'][ikey] = ikey_val
 113         elif rbody['Type'] == 'FileInclude':
 114             with open(rbody['Path']) as rfile:
 115                 include_content = yaml.safe_load(rfile.read())
 116                 subkeys = rbody.get('SubKey','').split('.')
 117                 while len(subkeys) and subkeys[0]:
 118                     include_content = include_content[subkeys.pop(0)]
 119                 for replace_param, replace_value in iter(rbody.get('Parameters',
 120                                                                    {}).items()):
 121                     include_content = resolve_params(include_content,
 122                                                      replace_param,
 123                                                      replace_value)
 124                 end_template['Resources'][r] = include_content
 125         else:
 126             if r in end_template.get('Resources', {}):
 127                 if rbody != end_template['Resources'][r]:
 128                     errors.append('Resource %s from %s conflicts' % (r,
 129                                                                      template_path))
 130                 continue
 131             if 'Resources' not in end_template:
 132                 end_template['Resources'] = {}
 133             end_template['Resources'][r] = rbody
 134
 135 def fix_ref(item, old, new):
 136     if isinstance(item, dict):
 137         copy_item = dict(item)
 138         for k, v in sorted(copy_item.items()):
 139             if k == 'Ref' and v == old:
 140                 item[k] = new
 141                 continue
 142             if k == 'DependsOn' and v == old:
 143                 item[k] = new
 144                 continue
 145             if k == 'Fn::GetAtt' and isinstance(v, list) and v[0] == old:
 146                 new_list = list(v)
 147                 new_list[0] = new
 148                 item[k] = new_list
 149                 continue
 150             if k == 'AllowedResources' and isinstance(v, list) and old in v:
 151                 while old in v:
 152                     pos = v.index(old)
 153                     v[pos] = new
 154                 continue
 155             fix_ref(v, old, new)
 156     elif isinstance(item, list):
 157         copy_item = list(item)
 158         for v in item:
 159             fix_ref(v, old, new)
 160
 161 for change in resource_changes:
 162     fix_ref(end_template, change[0], change[1])
 163
 164 if errors:
 165     for e in errors:
 166         sys.stderr.write("ERROR: %s\n" % e)
 167 end_template['Description'] = ','.join(end_template['Description'])
 168 sys.stdout.write(yaml.safe_dump(end_template, default_flow_style=False))