Expose decom.erase_hardware command via API

Expose an async decom.erase_hardware command in the API. Executing
this command simply calls erase_devices on the loaded HardwareManager
implementation.

Change-Id: I238264a4d5903200ad6a30d82b61804c1e3f5916

ironic_python_agent/extensions/decom.py

@@ -13,8 +13,14 @@
 # limitations under the License.
 
 from ironic_python_agent.extensions import base
+from ironic_python_agent import hardware
 
 
 class DecomExtension(base.BaseAgentExtension):
     def __init__(self):
         super(DecomExtension, self).__init__()
+        self.command_map['erase_hardware'] = self.erase_hardware
+
+    @base.async_command()
+    def erase_hardware(self):
+        hardware.get_manager().erase_devices()

ironic_python_agent/tests/extensions/decom.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+import mock
 from oslotest import base as test_base
 
 from ironic_python_agent.extensions import decom
@@ -21,3 +22,10 @@ class TestDecomExtension(test_base.BaseTestCase):
     def setUp(self):
         super(TestDecomExtension, self).setUp()
         self.agent_extension = decom.DecomExtension()
+
+    @mock.patch('ironic_python_agent.hardware.get_manager', autospec=True)
+    def test_erase_hardware(self, mocked_get_manager):
+        hardware_manager = mocked_get_manager.return_value
+        result = self.agent_extension.erase_hardware('erase_hardware')
+        result.join()
+        hardware_manager.erase_devices.assert_called_once_with()