Set correct initrd_filename for iPXE when using Swift

iPXE derives its "file names" from the last component of the URL path.
In case of the conductor's local server it's {mode}_{component} where
mode = deploy/rescue and component = kernel/ramdisk. However, in case
of Swift/Ceph, the last component will be different. This patch accounts
for it.

Change-Id: I7ba5545032069509a9c302abe1c21537ccb5ec8a
(cherry picked from commit c975eaa8c67d917feac75c9053cddcfb708e08a3)

3 files changed, 20 insertions, 5 deletions

diff --git a/ironic/common/pxe_utils.py b/ironic/common/pxe_utils.py
index 08d6d3f98..8ef1bfb47 100644
--- a/ironic/common/pxe_utils.py
+++ b/ironic/common/pxe_utils.py
@@ -18,6 +18,7 @@ import copy
 import os
 import shutil
 import tempfile
+from urllib import parse as urlparse
 
 from ironic_lib import utils as ironic_utils
 import jinja2
@@ -770,6 +771,7 @@ def build_deploy_pxe_options(task, pxe_info, mode='deploy',
     node = task.node
     kernel_label = '%s_kernel' % mode
     ramdisk_label = '%s_ramdisk' % mode
+    initrd_filename = ramdisk_label
     for label, option in ((kernel_label, 'deployment_aki_path'),
                           (ramdisk_label, 'deployment_ari_path')):
         if ipxe_enabled:
@@ -778,6 +780,10 @@ def build_deploy_pxe_options(task, pxe_info, mode='deploy',
                     and service_utils.is_glance_image(image_href)):
                 pxe_opts[option] = images.get_temp_url_for_glance_image(
                     task.context, image_href)
+                if label == ramdisk_label:
+                    path = urlparse.urlparse(pxe_opts[option]).path.strip('/')
+                    if path:
+                        initrd_filename = path.split('/')[-1]
             else:
                 pxe_opts[option] = '/'.join([CONF.deploy.http_url, node.uuid,
                                             label])
@@ -785,7 +791,7 @@ def build_deploy_pxe_options(task, pxe_info, mode='deploy',
             pxe_opts[option] = get_path_relative_to_tftp_root(
                 pxe_info[label][1])
     if ipxe_enabled:
-        pxe_opts['initrd_filename'] = ramdisk_label
+        pxe_opts['initrd_filename'] = initrd_filename
     return pxe_opts
 
 
diff --git a/ironic/tests/unit/common/test_pxe_utils.py b/ironic/tests/unit/common/test_pxe_utils.py
index 822c5f4ff..85afdd6b8 100644
--- a/ironic/tests/unit/common/test_pxe_utils.py
+++ b/ironic/tests/unit/common/test_pxe_utils.py
@@ -1791,9 +1791,10 @@ class iPXEBuildConfigOptionsTestCase(db_base.DbTestCase):
             self.config(ipxe_use_swift=True, group='pxe')
             glance = mock.Mock()
             glance_mock.return_value = glance
-            glance.swift_temp_url.side_effect = [
-                pxe_kernel, pxe_ramdisk] = [
-                'swift_kernel', 'swift_ramdisk']
+            glance.swift_temp_url.side_effect = [pxe_kernel, pxe_ramdisk] = [
+                'http://example.com/account/swift_kernel',
+                'http://example.com/account/swift_ramdisk'
+            ]
             image_info = {
                 kernel_label: (uuidutils.generate_uuid(),
                                os.path.join(root_dir,
@@ -1804,6 +1805,7 @@ class iPXEBuildConfigOptionsTestCase(db_base.DbTestCase):
                                              self.node.uuid,
                                              ramdisk_label))
             }
+            expected_initrd_filename = 'swift_ramdisk'
         else:
             pxe_kernel = os.path.join(http_url, self.node.uuid,
                                       kernel_label)
@@ -1819,6 +1821,7 @@ class iPXEBuildConfigOptionsTestCase(db_base.DbTestCase):
                                              self.node.uuid,
                                              ramdisk_label))
             }
+            expected_initrd_filename = ramdisk_label
 
         kernel = os.path.join(http_url, self.node.uuid, 'kernel')
         ramdisk = os.path.join(http_url, self.node.uuid, 'ramdisk')
@@ -1853,7 +1856,7 @@ class iPXEBuildConfigOptionsTestCase(db_base.DbTestCase):
             'ipxe_timeout': ipxe_timeout_in_ms,
             'ari_path': ramdisk,
             'aki_path': kernel,
-            'initrd_filename': ramdisk_label,
+            'initrd_filename': expected_initrd_filename,
         }
 
         if mode == 'rescue':
diff --git a/releasenotes/notes/initrd_filename-ac68e96f1c9fb576.yaml b/releasenotes/notes/initrd_filename-ac68e96f1c9fb576.yaml
new file mode 100644
index 000000000..b9eea262e
--- /dev/null
+++ b/releasenotes/notes/initrd_filename-ac68e96f1c9fb576.yaml
@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fixes the ``initrd`` kernel parameter when booting ramdisk directly from
+    Swift/RadosGW using iPXE. Previously it was always ``deploy_ramdisk``,
+    even when the actual file name is different.