guest os booting: add new modular case for direct kernel boot

This PR mainly automate the function of direct kernel boot feature in os
element.

Signed-off-by: Meina Li <[email protected]>

libvirt/tests/cfg/guest_os_booting/direct_kernel_boot/direct_kernel_boot.cfg

@@ -0,0 +1,10 @@
+- guest_os_booting.direct_kernel_boot:
+    type = direct_kernel_boot
+    start_vm = no
+    repo_url = "EXAMPLE_REPO_URL"
+    initrd_url = "${repo_url}/images/pxeboot/initrd.img"
+    vmlinuz_url = "${repo_url}/images/pxeboot/vmlinuz"
+    direct_kernel_dict = {'cmdline': 'console=ttyS0 inst.repo=${repo_url}', 'initrd': '%s', 'kernel': '%s'}
+    variants:
+        - start_guest:
+            check_prompt = "Starting installer"

libvirt/tests/src/guest_os_booting/direct_kernel_boot/direct_kernel_boot.py

@@ -0,0 +1,52 @@
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright Red Hat
+#
+#   SPDX-License-Identifier: GPL-2.0
+
+#   Author: Meina Li <[email protected]>
+#
+import os
+
+from avocado.utils import process
+
+from virttest import data_dir
+from virttest import utils_package
+from virttest.libvirt_xml import vm_xml
+
+from provider.guest_os_booting import guest_os_booting_base as guest_os
+
+
+def run(test, params, env):
+    """
+    This case is to verify the direct kernel boot.
+    1) Prepare a guest with direct kernel boot.
+    2) Start the guest.
+    3) Save and restore the guest.
+    """
+    vm_name = params.get("main_vm")
+    initrd_url = params.get("initrd_url")
+    vmlinuz_url = params.get("vmlinuz_url")
+    check_prompt = params.get("check_prompt")
+
+    vm = env.get_vm(vm_name)
+    vmxml = vm_xml.VMXML.new_from_inactive_dumpxml(vm_name)
+    bkxml = vmxml.copy()
+
+    try:
+        boot_initrd = os.path.join(data_dir.get_data_dir(), "initrd.img")
+        boot_vmlinuz = os.path.join(data_dir.get_data_dir(), "vmlinuz")
+        guest_os.download_file(initrd_url, boot_initrd, test)
+        guest_os.download_file(vmlinuz_url, boot_vmlinuz, test)
+        direct_kernel_dict = eval(params.get("direct_kernel_dict", "{}")
+                                  % (boot_initrd, boot_vmlinuz))
+        guest_os.prepare_os_xml(vm_name, direct_kernel_dict)
+        if not vm.is_alive():
+            vm.start()
+        vm.serial_console.read_until_any_line_matches([check_prompt], timeout=120)
+    finally:
+        bkxml.sync()
+        for file_path in [boot_initrd, boot_vmlinuz]:
+            if os.path.exists(file_path):
+                os.remove(file_path)

provider/guest_os_booting/guest_os_booting_base.py

@@ -1,9 +1,12 @@
 import logging
+import os
 
 from avocado.core import exceptions
 from avocado.utils import distro
+from avocado.utils import process
 
 from virttest import virsh
+from virttest import utils_package
 from virttest.libvirt_xml import vm_xml
 from virttest.utils_libvirt import libvirt_bios
 from virttest.utils_test import libvirt
@@ -95,3 +98,21 @@ def check_vm_startup(vm, vm_name, error_msg=None):
         vm.wait_for_login().close()
         LOG.debug("Succeed to boot %s", vm_name)
     return vmxml
+
+
+def download_file(url, dest_file, test):
+    """
+    Perform file download via wget
+    :param url: The source url
+    :param dest_file: The dest file path
+    :param test: Avocado test object
+    """
+    if utils_package.package_install("wget"):
+        if url.count("URL"):
+            test.cancel("Please provide the url %s" % url)
+        download_cmd = "wget %s -O %s" % (url, dest_file)
+        if not os.path.exists(dest_file):
+            if process.system(download_cmd, verbose=False, shell=True):
+                test.error("Failed to download boot iso file")
+    else:
+        test.error("wget install failed")