image/appc: fix volume conversion and add tests

image/appc/__init__.py

@@ -156,8 +156,8 @@ class DockerV1ToACIManifestTranslator(object):
       volume_name = DockerV1ToACIManifestTranslator._ac_name(docker_volume_path)
       return "volume-%s" % volume_name
 
-    volume_list = docker_config['Volumes'] or docker_config['volumes'] or []
+    volume_list = docker_config['Volumes'] or docker_config['volumes'] or {}
-    for docker_volume_path in volume_list:
+    for docker_volume_path in volume_list.iterkeys():
       if not docker_volume_path:
         continue
 

image/appc/test/test_appc.py

@@ -2,6 +2,7 @@ import pytest
 
 from image.appc import DockerV1ToACIManifestTranslator
 from data.interfaces.verbs import RepositoryReference, ImageWithBlob
+from util.dict_wrappers import JSONPathDict
 
 
 EXAMPLE_MANIFEST_OBJ = {
@@ -96,3 +97,16 @@ def test_legacy_port_conversion(repo_image):
   ports.sort()
   assert {'name':'port-8080', 'port':8080, 'protocol':'tcp'} == ports[0]
   assert {'name':'port-8081', 'port':8081, 'protocol':'tcp'} == ports[1]
+
+
+@pytest.mark.parametrize("vcfg,expected", [
+  ({'Volumes': None}, []),
+  ({'Volumes': {}}, []),
+  ({'Volumes': {'/bin': {}}}, [{'name': 'volume-bin', 'path': '/bin', 'readOnly': False}]),
+  ({'volumes': None}, []),
+  ({'volumes': {}}, []),
+  ({'volumes': {'/bin': {}}}, [{'name': 'volume-bin', 'path': '/bin', 'readOnly': False}]),
+])
+def test_volume_version_easy(vcfg, expected):
+  output = DockerV1ToACIManifestTranslator._build_volumes(JSONPathDict(vcfg))
+  assert output == expected

util/dict_wrappers.py

@@ -59,8 +59,16 @@ class JSONPathDict(object):
   def __getitem__(self, path):
     return self.get(path)
 
+  def __iter__(self):
+    return self._object.itervalues()
+
+  def iterkeys(self):
+    return self._object.iterkeys()
+
   def get(self, path, not_found_handler=None):
     """ Returns the value found at the given path. Path is a json-path expression. """
+    if self._object == {} or self._object is None:
+      return None
     jsonpath_expr = parse(path)
     matches = jsonpath_expr.find(self._object)
     if not matches:
@@ -77,4 +85,3 @@ class JSONPathDict(object):
 
   def keys(self):
     return self._object.keys()
-