summaryrefslogtreecommitdiffstats
path: root/merge.py
blob: 3b7d2dd35d63a2b140658a70491c45249d49da83 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
import sys
import yaml
import argparse

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')

args = parser.parse_args()

templates = args.templates

def _translate_role(role):
    global args
    if not args.master_role:
        return role
    if role == args.master_role:
        return role
    if role not in args.slave_roles:
        return role
    return args.master_role

def translate_role(role):
    r = _translate_role(role)
    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'},
                 }


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

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:
            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)
            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
            ikey = '%sImage' % (role)
            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())
                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'])
sys.stdout.write(yaml.safe_dump(end_template, default_flow_style=False))