[PATCH] search: new --efidisk-only option on EFI systems

[Renaud Métrich]

When using 'search' on EFI systems, we sometimes want to exclude devices that are not EFI disks (e.g. md, lvm).
This is typically used when wanting to chainload when having a software raid (md) for EFI partition:

with no option, 'search --file /EFI/redhat/shimx64.efi' sets root envvar to 'md/boot_efi' which cannot be used for chainloading since there is no effective EFI device behind.

Example of "grub.cfg" file used to chainload when system boots over the network:

~~~

menuentry 'Chainload Grub2 EFI from ESP' --id local {
  unset root
  search --file --no-floppy --efidisk-only --set=root /EFI/BOOT/BOOTX64.EFI
  if [ -f ($root)/EFI/BOOT/grubx64.efi ]; then
    chainloader ($root)/EFI/BOOT/grubx64.efi
  elif [ -f ($root)/EFI/redhat/shimx64.efi ]; then
    chainloader ($root)/EFI/redhat/shimx64.efi
  elif [ -f ($root)/EFI/redhat/grubx64.efi ]; then
    chainloader ($root)/EFI/redhat/grubx64.efi
  fi
}

~~~

This patch has been tested on QEMU/KVM systems and VMWare VMs (at hardware level 6.7 and 7.0u2).

Related Red Hat BZ (public): https://bugzilla.redhat.com/show_bug.cgi?id=2048904

0001-search-new-efidisk-only-option-on-EFI-systems.patch
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