Support forcing rebuild of deployment images

It is hard to know when disk images need to be rebuilt, and the
stackhpc.os-images role simply checks for the presence of the DIB output
directory to indicate that an image exists. In some cases, we may wish to force
the rebuilding of a deployment (IPA) image, when we know there are changes to
apply. This change adds a --force-rebuild argument to the following commands:

kayobe seed deployment image build
kayobe overcloud deployment image build

Change-Id: I580811a4f621df9445ef32773ca66bcf303dad9b

ansible/overcloud-ipa-build.yml

@@ -20,7 +20,15 @@
     - ipa-build
   vars:
     ipa_image_name: "ipa"
+    ipa_image_force_rebuild: false
   tasks:
+    - block:
+        - name: Ensure existing Ironic Python Agent images are removed (force rebuild)
+          file:
+            path: "{{ image_cache_path }}/{{ ipa_image_name }}"
+            state: absent
+          when: ipa_image_force_rebuild | bool
+
         - name: Ensure Ironic Python Agent images are built
           include_role:
             name: stackhpc.os-images

ansible/seed-ipa-build.yml

@@ -11,8 +11,15 @@
     ipa_images:
       - "{{ ipa_image_name }}.vmlinuz"
       - "{{ ipa_image_name }}.initramfs"
+    ipa_image_force_rebuild: false
   tasks:
     - block:
+        - name: Ensure existing Ironic Python Agent images are removed (force rebuild)
+          file:
+            path: "{{ image_cache_path }}/{{ ipa_image_name }}"
+            state: absent
+          when: ipa_image_force_rebuild | bool
+
         - name: Ensure Ironic Python Agent images are built
           include_role:
             name: stackhpc.os-images

doc/source/deployment.rst

@@ -164,6 +164,9 @@ should be set to ``True``.  To build images locally::
 
     (kayobe) $ kayobe seed deployment image build
 
+If images have been built previously, they will not be rebuilt.  To force
+rebuilding images, use the ``--force-rebuild`` argument.
+
 Accessing the Seed via SSH (Optional)
 -------------------------------------
 
@@ -333,6 +336,11 @@ Building Deployment Images
    It is possible to use prebuilt deployment images. In this case, this step
    can be skipped.
 
+.. note::
+
+   Deployment images are only required for the overcloud when Ironic is in use.
+   Otherwise, this step can be skipped.
+
 It is possible to use prebuilt deployment images from the `OpenStack hosted
 tarballs <https://tarballs.openstack.org/ironic-python-agent>`_ or another
 source.  In some cases it may be necessary to build images locally either to
@@ -342,6 +350,9 @@ should be set to ``True``.  To build images locally::
 
     (kayobe) $ kayobe overcloud deployment image build
 
+If images have been built previously, they will not be rebuilt.  To force
+rebuilding images, use the ``--force-rebuild`` argument.
+
 Deploying Containerised Services
 --------------------------------
 

kayobe/cli/commands.py

@@ -514,10 +514,22 @@ class SeedDeploymentImageBuild(KayobeAnsibleMixin, VaultMixin, Command):
     (DIB) for use when provisioning and inspecting the overcloud hosts.
     """
 
+    def get_parser(self, prog_name):
+        parser = super(SeedDeploymentImageBuild, self).get_parser(
+            prog_name)
+        group = parser.add_argument_group("Deployment Image Build")
+        group.add_argument("--force-rebuild", action="store_true",
+                           help="whether to force rebuilding the images")
+        return parser
+
     def take_action(self, parsed_args):
         self.app.LOG.debug("Building seed deployment images")
         playbooks = _build_playbook_list("seed-ipa-build")
-        self.run_kayobe_playbooks(parsed_args, playbooks)
+        extra_vars = {}
+        if parsed_args.force_rebuild:
+            extra_vars["ipa_image_force_rebuild"] = True
+        self.run_kayobe_playbooks(parsed_args, playbooks,
+                                  extra_vars=extra_vars)
 
 
 class OvercloudInventoryDiscover(KayobeAnsibleMixin, VaultMixin, Command):
@@ -1073,10 +1085,22 @@ class OvercloudContainerImageBuild(KayobeAnsibleMixin, VaultMixin, Command):
 class OvercloudDeploymentImageBuild(KayobeAnsibleMixin, VaultMixin, Command):
     """Build the overcloud deployment kernel and ramdisk images."""
 
+    def get_parser(self, prog_name):
+        parser = super(OvercloudDeploymentImageBuild, self).get_parser(
+            prog_name)
+        group = parser.add_argument_group("Deployment Image Build")
+        group.add_argument("--force-rebuild", action="store_true",
+                           help="whether to force rebuilding the images")
+        return parser
+
     def take_action(self, parsed_args):
         self.app.LOG.debug("Building overcloud deployment images")
         playbooks = _build_playbook_list("overcloud-ipa-build")
-        self.run_kayobe_playbooks(parsed_args, playbooks)
+        extra_vars = {}
+        if parsed_args.force_rebuild:
+            extra_vars["ipa_image_force_rebuild"] = True
+        self.run_kayobe_playbooks(parsed_args, playbooks,
+                                  extra_vars=extra_vars)
 
 
 class OvercloudPostConfigure(KayobeAnsibleMixin, VaultMixin, Command):

kayobe/tests/unit/cli/test_commands.py

@@ -387,6 +387,48 @@ class TestCase(unittest.TestCase):
         ]
         self.assertEqual(expected_calls, mock_run.call_args_list)
 
+    @mock.patch.object(commands.KayobeAnsibleMixin,
+                       "run_kayobe_playbooks")
+    def test_seed_deployment_image_build(self, mock_run):
+        command = commands.SeedDeploymentImageBuild(TestApp(), [])
+        parser = command.get_parser("test")
+        parsed_args = parser.parse_args([])
+
+        result = command.run(parsed_args)
+        self.assertEqual(0, result)
+
+        expected_calls = [
+            mock.call(
+                mock.ANY,
+                [
+                    "ansible/seed-ipa-build.yml",
+                ],
+                extra_vars={},
+            ),
+        ]
+        self.assertEqual(expected_calls, mock_run.call_args_list)
+
+    @mock.patch.object(commands.KayobeAnsibleMixin,
+                       "run_kayobe_playbooks")
+    def test_seed_deployment_image_build_force_rebuild(self, mock_run):
+        command = commands.SeedDeploymentImageBuild(TestApp(), [])
+        parser = command.get_parser("test")
+        parsed_args = parser.parse_args(["--force-rebuild"])
+
+        result = command.run(parsed_args)
+        self.assertEqual(0, result)
+
+        expected_calls = [
+            mock.call(
+                mock.ANY,
+                [
+                    "ansible/seed-ipa-build.yml",
+                ],
+                extra_vars={"ipa_image_force_rebuild": True},
+            ),
+        ]
+        self.assertEqual(expected_calls, mock_run.call_args_list)
+
     @mock.patch.object(commands.KayobeAnsibleMixin,
                        "run_kayobe_playbooks")
     @mock.patch.object(commands.KollaAnsibleMixin,
@@ -674,6 +716,48 @@ class TestCase(unittest.TestCase):
         ]
         self.assertEqual(expected_calls, mock_run.call_args_list)
 
+    @mock.patch.object(commands.KayobeAnsibleMixin,
+                       "run_kayobe_playbooks")
+    def test_overcloud_deployment_image_build(self, mock_run):
+        command = commands.OvercloudDeploymentImageBuild(TestApp(), [])
+        parser = command.get_parser("test")
+        parsed_args = parser.parse_args([])
+
+        result = command.run(parsed_args)
+        self.assertEqual(0, result)
+
+        expected_calls = [
+            mock.call(
+                mock.ANY,
+                [
+                    "ansible/overcloud-ipa-build.yml",
+                ],
+                extra_vars={},
+            ),
+        ]
+        self.assertEqual(expected_calls, mock_run.call_args_list)
+
+    @mock.patch.object(commands.KayobeAnsibleMixin,
+                       "run_kayobe_playbooks")
+    def test_overcloud_deployment_image_build_force_rebuild(self, mock_run):
+        command = commands.OvercloudDeploymentImageBuild(TestApp(), [])
+        parser = command.get_parser("test")
+        parsed_args = parser.parse_args(["--force-rebuild"])
+
+        result = command.run(parsed_args)
+        self.assertEqual(0, result)
+
+        expected_calls = [
+            mock.call(
+                mock.ANY,
+                [
+                    "ansible/overcloud-ipa-build.yml",
+                ],
+                extra_vars={"ipa_image_force_rebuild": True},
+            ),
+        ]
+        self.assertEqual(expected_calls, mock_run.call_args_list)
+
     @mock.patch.object(commands.KayobeAnsibleMixin,
                        "run_kayobe_playbooks")
     def test_overcloud_post_configure(self, mock_run):