bootloader: rely on unified GRUB configuration for UEFI and BIOS

With the unified GRUB configuration in Fedora and EL, the bootloader setup no longer requires
a custom EFI stub config. The grub2-common package automatically generates this stub,
which points to a single, hybrid configuration file at /boot/grub2/grub.cfg.

This patch simplifies the code by removing redundant EFI-specific configuration steps and
relying on grub2-common to handle the UEFI stub creation.

anaconda.spec.in

@@ -143,6 +143,8 @@ Requires: python3-pid
 Requires: crypto-policies
 Requires: crypto-policies-scripts
 
+Requires: grub2-common
+
 # required because of the rescue mode and RDP question
 Requires: anaconda-tui = %{version}-%{release}
 

pyanaconda/modules/storage/bootloader/efi.py

@@ -178,27 +178,7 @@ def efi_config_file(self):
         return "%s/%s" % (self.efi_config_dir, self._config_file)
 
     def write_config(self):
-        config_path = "%s%s" % (conf.target.system_root, self.efi_config_file)
-
-        with open(config_path, "w") as fd:
-            grub_dir = self.config_dir
-            if self.stage2_device.format.type != "btrfs":
-                fs_uuid = self.stage2_device.format.uuid
-            else:
-                fs_uuid = self.stage2_device.format.vol_uuid
-
-            if fs_uuid is None:
-                raise BootLoaderError("Could not get stage2 filesystem UUID")
-
-            grub_dir = util.execWithCapture("grub2-mkrelpath", [grub_dir],
-                                            root=conf.target.system_root)
-            if not grub_dir:
-                raise BootLoaderError("Could not get GRUB directory path")
-
-            fd.write("search --no-floppy --fs-uuid --set=dev %s\n" % fs_uuid)
-            fd.write("set prefix=($dev)%s\n" % grub_dir)
-            fd.write("export $prefix\n")
-            fd.write("configfile $prefix/grub.cfg\n")
+        """ Use the unified GRUB configuration provided by grub2-common. """
 
         super().write_config()