Replace initrd and add kernel config as optional parameter to transformer 'dom0_binaries' (#3405)

Copy kernel config under /boot if passed to the transformer
Copy initrd if passed from runbook else create softlink for existing
initrd image with new kernel version in filename

Signed-off-by: Smit Gardhariya <sgardhariya@microsoft.com>

lisa/transformers/dom0_kernel_installer.py

@@ -9,7 +9,7 @@ from dataclasses_json import dataclass_json
 
 from lisa import schema
 from lisa.node import Node
-from lisa.tools import Cp, Echo, Ls, Sed, Tar, Uname
+from lisa.tools import Cp, Echo, Ln, Ls, Sed, Tar, Uname
 from lisa.util import field_metadata
 
 from .kernel_installer import BaseInstaller, BaseInstallerSchema
@@ -35,6 +35,14 @@ class BinaryInstallerSchema(BaseInstallerSchema):
         ),
     )
 
+    # kernel config local absolute path
+    kernel_config_path: str = field(
+        default="",
+        metadata=field_metadata(
+            required=True,
+        ),
+    )
+
     # initrd binary local absolute path
     initrd_image_path: str = field(
         default="",
@@ -67,7 +75,7 @@ class BinaryInstaller(BaseInstaller):
         kernel_image_path: str = runbook.kernel_image_path
         initrd_image_path: str = runbook.initrd_image_path
         kernel_modules_path: str = runbook.kernel_modules_path
-        is_initrd: bool = False
+        kernel_config_path: str = runbook.kernel_config_path
 
         uname = node.tools[Uname]
         current_kernel = uname.get_linux_information().kernel_version_raw
@@ -106,7 +114,6 @@ class BinaryInstaller(BaseInstaller):
         if initrd_image_path:
             err = f"Can not find initrd image path: {initrd_image_path}"
             assert os.path.exists(initrd_image_path), err
-            is_initrd = True
             node.shell.copy(
                 PurePath(initrd_image_path),
                 node.get_pure_path(f"/var/tmp/initrd.img-{new_kernel}"),
@@ -116,10 +123,29 @@ class BinaryInstaller(BaseInstaller):
                 node.get_pure_path(f"/var/tmp/initrd.img-{new_kernel}"),
                 node.get_pure_path(f"/boot/initrd.img-{new_kernel}"),
             )
+        else:
+            ln = node.tools[Ln]
+            ln.create_link(
+                target=f"/boot/initrd.img-{current_kernel}",
+                link=f"/boot/initrd.img-{new_kernel}",
+            )
+
+        if kernel_config_path:
+            # Copy kernel config
+            err = f"Can not find kernel config path: {kernel_config_path}"
+            assert os.path.exists(kernel_config_path), err
+            node.shell.copy(
+                PurePath(kernel_config_path),
+                node.get_pure_path(f"/var/tmp/config-{new_kernel}"),
+            )
+            _copy_kernel_binary(
+                node,
+                node.get_pure_path(f"/var/tmp/config-{new_kernel}"),
+                node.get_pure_path(f"/boot/config-{new_kernel}"),
+            )
 
         _update_mariner_config(
             node,
-            is_initrd,
             current_kernel,
             new_kernel,
         )
@@ -161,7 +187,6 @@ class Dom0Installer(SourceInstaller):
 
         _update_mariner_config(
             node,
-            True,
             current_kernel,
             new_kernel,
         )
@@ -184,7 +209,6 @@ def _copy_kernel_binary(
 
 def _update_mariner_config(
     node: Node,
-    is_initrd: bool,
     current_kernel: str,
     new_kernel: str,
 ) -> None:
@@ -199,11 +223,10 @@ def _update_mariner_config(
         sudo=True,
     )
 
-    if is_initrd:
-        # Modify the /boot/mariner-mshv.cfg to point new initrd binary
-        sed.substitute(
-            regexp=f"mariner_initrd_mshv=initrd.img-{current_kernel}",
-            replacement=f"mariner_initrd_mshv=initrd.img-{new_kernel}",
-            file=mariner_config,
-            sudo=True,
-        )
+    # Modify the /boot/mariner-mshv.cfg to point new initrd binary
+    sed.substitute(
+        regexp=f"mariner_initrd_mshv=initrd.img-{current_kernel}",
+        replacement=f"mariner_initrd_mshv=initrd.img-{new_kernel}",
+        file=mariner_config,
+        sudo=True,
+    )