Add 'ccp config dump' command

This command dumps current config with all default vaules omitted from
original config

Change-Id: I4fda39903330452780c898be0cfae1c249e5f527

fuel_ccp/cli.py

@@ -161,6 +161,20 @@ class ShowDep(BaseCommand):
         dependencies.show_dep(parsed_args.components)
 
 
+class ConfigDump(BaseCommand):
+    """Dump full current configuration to stdout"""
+
+    def get_parser(self, *args, **kwargs):
+        parser = super(ConfigDump, self).get_parser(*args, **kwargs)
+        return parser
+
+    def take_action(self, parsed_args):
+        if CONF.repositories.clone:
+            do_fetch()
+        config.load_component_defaults()
+        config.dump_yaml(self.app.stdout)
+
+
 def signal_handler(signo, frame):
     sys.exit(-signo)
 

fuel_ccp/config/__init__.py

@@ -106,3 +106,7 @@ def load_component_defaults():
     global _REAL_CONF
     new_config._merge(_REAL_CONF)
     _REAL_CONF = new_config
+
+
+def dump_yaml(stream):
+    _yaml.dump(_REAL_CONF, stream)

fuel_ccp/config/_yaml.py

@@ -115,6 +115,20 @@ def load_with_includes(filename):
     return res
 
 
+class Dumper(yaml.SafeDumper):
+    pass
+
+
+def represent_attr_dict(dumper, data):
+    return dumper.represent_dict(data._dict)
+
+Dumper.add_representer(AttrDict, represent_attr_dict)
+
+
+def dump(obj, stream):
+    yaml.dump(obj, stream, Dumper=Dumper, default_flow_style=False)
+
+
 class UnwrapAttrDict(dict):
     def __init__(self, attr_dict):
         return super(UnwrapAttrDict, self).__init__(attr_dict._dict)

fuel_ccp/tests/test_config_yaml.py

@@ -1,4 +1,5 @@
 import fixtures
+import io
 import mock
 import six
 import testscenarios
@@ -101,3 +102,31 @@ class TestLoadWithIncludes(testscenarios.WithScenarios, base.TestCase):
 
         res = _yaml.load_with_includes('config')
         self.assertEqual(res, self.expected_result)
+
+
+class TestLoadDump(testscenarios.WithScenarios, base.TestCase):
+    scenarios = [
+        ('simple', {'yaml': 'a: b\n', 'parsed': {'a': 'b'}}),
+        ('nested', {
+            'yaml': 'a:\n  b: c\n',
+            'parsed': {'a': {'b': 'c'}},
+        }),
+    ]
+
+    yaml = None
+    parsed = None
+
+    def test_load(self):
+        res = _yaml.load(self.yaml)
+        self.assertIsInstance(res, _yaml.AttrDict)
+        self.assertEqual(self.parsed, res)
+
+    def test_dump(self):
+        obj = _yaml.AttrDict()
+        obj._merge(self.parsed)
+        if str is bytes:
+            stream = io.BytesIO()
+        else:
+            stream = io.StringIO()
+        _yaml.dump(obj, stream)
+        self.assertEqual(self.yaml, stream.getvalue())

setup.cfg

@@ -33,6 +33,7 @@ ccp.cli =
     fetch = fuel_ccp.cli:Fetch
     show-dep = fuel_ccp.cli:ShowDep
     validate = fuel_ccp.cli:Validate
+    config_dump = fuel_ccp.cli:ConfigDump
 
 [build_sphinx]
 source-dir = doc/source