grubby-8.40-72.fc40.aarch64

In a mainline kernel git tree:

root@fedora-x13s:~/linux# make install
  INSTALL /boot
grub2-mkrelpath: error: failed to get canonical path of `/boot/vmlinuz-6.6.0-rc4JL_CONFIG_CHANGES+'.
dirname: missing operand
Try 'dirname --help' for more information.


The machine then fails to boot because the kernel wasn't copied to /boot

Replacing the symlink change in -72 with the original grubby `installkernel` fixes the problem and now the machine can boot.


Reproducible: Always

Steps to Reproduce:
1. Git clone mainline kernel
2. copy /boot/config-XXX to kernel
3. make; make modules_install; make install
Actual Results:  
  INSTALL /boot
grub2-mkrelpath: error: failed to get canonical path of `/boot/vmlinuz-6.6.0-rc4JL_CONFIG_CHANGES+'.
dirname: missing operand
Try 'dirname --help' for more information.

Expected Results:  
  INSTALL /boot
grep: warning: stray \ before /
kdump: For kernel=/boot/vmlinuz-6.6.0-rc4JL_CONFIG_CHANGES+, crashkernel=1G-4G:256M,4G-64G:320M,64G-:576M now. Please reboot the system for the change to take effet. Note if you don't want kexec-tools to manage the crashkernel kernel parameter, please set auto_reset_crashkernel=no in /etc/kdump.conf.


Fixed by reverting to the previous grubby installkernel script.