Implement get_deploy_steps for AgentRAID

This allows using software RAID as an in-band deploy step.

Change-Id: I66103598cf58267010a09b1bd654dc90f714c202

ironic/drivers/modules/agent.py

@@ -622,6 +622,18 @@ class AgentRAID(base.RAIDInterface):
         """Return the properties of the interface."""
         return {}
 
+    @METRICS.timer('AgentRAID.get_deploy_steps')
+    def get_deploy_steps(self, task):
+        """Get the list of deploy steps from the agent.
+
+        :param task: a TaskManager object containing the node
+        :raises InstanceDeployFailure: if the deploy steps are not yet
+            available (cached), for example, when a node has just been
+            enrolled and has not been deployed yet.
+        :returns: A list of deploy step dictionaries
+        """
+        return agent_base.get_steps(task, 'deploy', interface='raid')
+
     @METRICS.timer('AgentRAID.create_configuration')
     @base.clean_step(priority=0)
     def create_configuration(self, task,

ironic/tests/unit/drivers/modules/test_agent.py

@@ -1649,6 +1649,18 @@ class AgentRAIDTestCase(db_base.DbTestCase):
         self.assertEqual(0, ret[0]['priority'])
         self.assertEqual(0, ret[1]['priority'])
 
+    @mock.patch.object(agent_base, 'get_steps', autospec=True)
+    def test_get_deploy_steps(self, get_steps_mock):
+        get_steps_mock.return_value = [
+            {'step': 'apply_configuration', 'interface': 'raid',
+             'priority': 0},
+        ]
+
+        with task_manager.acquire(self.context, self.node.uuid) as task:
+            ret = task.driver.raid.get_deploy_steps(task)
+
+        self.assertEqual('apply_configuration', ret[0]['step'])
+
     @mock.patch.object(raid, 'filter_target_raid_config', autospec=True)
     @mock.patch.object(agent_base, 'execute_step', autospec=True)
     def test_create_configuration(self, execute_mock,

releasenotes/notes/agent-raid-647acfd599e83476.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    The ``agent`` RAID interface now supports building RAID as a deploy step
+    ``apply_configuration``.