Allow ramdisk_image_download_source in instance_info for ramdisk deploy

Change-Id: Ie0697d25787ebfdfb80f84b93c0cb8c2f45ad090

doc/source/admin/ramdisk-boot.rst

@@ -92,6 +92,14 @@ For example,
         --instance-info boot_iso=http://path/to/boot.iso
     baremetal node deploy <NODE>
 
+By default the Bare Metal service will cache the ISO locally and serve from its
+HTTP server. If you want to avoid that, set the following:
+
+.. code-block:: shell
+
+    baremetal node set <NODE> \
+        --instance-info ramdisk_image_download_source=http
+
 .. warning::
    This feature, when utilized with the ``ipxe`` ``boot_interface``,
    will only allow a kernel and ramdisk to be booted from the

ironic/drivers/modules/image_utils.py

@@ -424,9 +424,18 @@ def _prepare_iso_image(task, kernel_href, ramdisk_href,
             "building ISO, or explicit ISO for %(node)s") %
             {'node': task.node.uuid})
 
+    i_info = task.node.instance_info
+
+    boot_option = deploy_utils.get_boot_option(task.node)
+    if boot_option == 'ramdisk':
+        download_source = (i_info.get('ramdisk_image_download_source')
+                           or CONF.deploy.ramdisk_image_download_source)
+    else:
+        download_source = CONF.deploy.ramdisk_image_download_source
+
     # NOTE(rpittau): if base_iso is defined as http address, we just access
     # it directly.
-    if base_iso and CONF.deploy.ramdisk_image_download_source == 'http':
+    if base_iso and download_source == 'http':
         if base_iso.startswith(('http://', 'https://')):
             return base_iso
         LOG.debug("ramdisk_image_download_source set to http but "
@@ -435,11 +444,9 @@ def _prepare_iso_image(task, kernel_href, ramdisk_href,
 
     img_handler = ImageHandler(task.node.driver)
 
-    i_info = task.node.instance_info
-
     # NOTE(TheJulia): Until we support modifying a base iso, most of
     # this logic actually does nothing in the end. But it should!
-    if deploy_utils.get_boot_option(task.node) == "ramdisk":
+    if boot_option == "ramdisk":
         if not base_iso:
             kernel_params = "root=/dev/ram0 text "
             kernel_params += i_info.get("ramdisk_kernel_arguments", "")

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

@@ -23,6 +23,7 @@ from oslo_utils import importutils
 from ironic.common import images
 from ironic.common import utils
 from ironic.conductor import task_manager
+from ironic.drivers.modules import deploy_utils
 from ironic.drivers.modules import image_utils
 from ironic.tests.unit.db import base as db_base
 from ironic.tests.unit.db import utils as db_utils
@@ -610,6 +611,17 @@ class RedfishImageUtilsTestCase(db_base.DbTestCase):
                 base_iso=base_image_url)
             self.assertEqual(url, base_image_url)
 
+    @mock.patch.object(deploy_utils, 'get_boot_option', lambda node: 'ramdisk')
+    def test__prepare_iso_image_bootable_iso_with_instance_info(self):
+        with task_manager.acquire(self.context, self.node.uuid,
+                                  shared=True) as task:
+            base_image_url = 'http://bearmetal.net/boot.iso'
+            task.node.instance_info['ramdisk_image_download_source'] = 'http'
+            url = image_utils._prepare_iso_image(
+                task, None, None, bootloader_href=None, root_uuid=None,
+                base_iso=base_image_url)
+            self.assertEqual(url, base_image_url)
+
     @mock.patch.object(image_utils.ImageHandler, 'publish_image',
                        autospec=True)
     @mock.patch.object(images, 'create_boot_iso', autospec=True)

releasenotes/notes/ramdisk-image-download-source-7a071aba7890ba95.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - |
+    For the ``ramdisk`` deploy interface, the ``ramdisk_image_download_source``
+    option can now be provided in the node's ``instance_info`` in addition
+    to the global configuration.