CA-407115: Adding logic to handle boot entries with no additional arguments

Function readGrub2 parses the arguments for each entries in grub.cfg,
Missing arguments would result in an error in the original code.
So added logic to handle the case of an entry with no arguments (e.g. memtest86+x64.efi).

Signed-off-by: Stephen Cheng <stephen.cheng@cloud.com>

Author: stephenchengCloud

xcp/bootloader.py

@@ -345,6 +345,12 @@ def create_label(title):
             COUNTER += 1
             return "label%d" % COUNTER
 
+        def parse_boot_entry(line):
+            parts = line.split(None, 2)  # Split into at most 3 parts
+            entry = parts[1] if len(parts) > 1 else ""
+            args = parts[2] if len(parts) > 2 else ""
+            return entry, args
+        
         fh = open_textfile(src_file, "r")
         try:
             for line in fh:
@@ -395,23 +401,18 @@ def create_label(title):
                 elif title:
                     if l.startswith("multiboot2"):
                         if "tboot" in l:
-                            tboot, tboot_args = (l.split(None, 1)
-                                                 [1].split(None, 1))
+                            tboot, tboot_args = parse_boot_entry(l)
                         else:
-                            hypervisor, hypervisor_args = (l.split(None, 1)
-                                                           [1].split(None, 1))
+                            hypervisor, hypervisor_args = parse_boot_entry(l)
                     elif l.startswith("module2"):
                         if not hypervisor:
-                            hypervisor, hypervisor_args = (l.split(None, 1)
-                                                           [1].split(None, 1))
+                            hypervisor, hypervisor_args = parse_boot_entry(l)
                         elif kernel:
                             initrd = l.split(None, 1)[1]
                         else:
-                            kernel, kernel_args = (l.split(None, 1)
-                                                   [1].split(None, 1))
+                            kernel, kernel_args = parse_boot_entry(l)
                     elif l.startswith("linux"):
-                        kernel, kernel_args = (l.split(None, 1)
-                                               [1].split(None, 1))
+                        kernel, kernel_args = parse_boot_entry(l)
                     elif l.startswith("initrd"):
                         initrd = l.split(None, 1)[1]
                     elif l.startswith("search --label --set root"):