Add convert_docker_params function

This will be used in workflows to transition from the
old Docker* parameters to the new Container* varients.

Change-Id: I29d5791acaafa31de15bd58a79302a6b0cb0b7dd

tripleo_common/tests/utils/test_parameters.py

@@ -187,3 +187,22 @@ class ParametersTest(base.TestCase):
         self.assertRaises(exception.DeriveParamsError,
                           parameters.get_profile_of_flavor,
                           'no_profile', compute_client)
+
+    def test_convert_docker_params(self):
+
+        env = {
+            'parameter_defaults': {
+                'DockerFooImage': 'bar',
+                'DockerNoOverwriteImage': 'zzzz',
+                'ContainerNoOverwriteImage': 'boom',
+                'ContainerNoChangeImage': 'bar',
+                'DockerNoChangeImage': 'bar',
+            }
+        }
+
+        parameters.convert_docker_params(env)
+        pd = env.get('parameter_defaults', {})
+        self.assertEqual(pd['ContainerFooImage'], 'bar')
+        self.assertEqual(pd['ContainerNoOverwriteImage'], 'boom')
+        self.assertEqual(pd['ContainerNoChangeImage'], 'bar')
+        self.assertEqual(pd['DockerNoChangeImage'], 'bar')

tripleo_common/utils/parameters.py

@@ -123,3 +123,18 @@ def get_profile_of_flavor(flavor_name, compute_client):
         raise exception.DeriveParamsError(
             'Unable to determine flavor for flavor name: '
             '%s' % flavor_name)
+
+
+def convert_docker_params(stack_env=None):
+    """Convert Docker* params to "Container" varients for compatibility.
+
+    """
+
+    if stack_env:
+        pd = stack_env.get('parameter_defaults', {})
+        for k, v in pd.copy().items():
+            if k.startswith('Docker') and k.endswith('Image'):
+                name = "Container%s" % k[6:]
+                pd.setdefault(name, v)
+        # TODO(dprince) add other Docker* conversions here once
+        # this is wired in