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On UEFI machines "rear mkbackup" (or just "rear mkrescue" which is faster so more suitable for reproducing) fails with the message
ERROR: Error occurred during grub2-mkimage of BOOTX64.efi
The log shows more details:
grub2-mkimage: error: cannot open `/usr/lib/grub/x86_64-efi/linuxefi.mod': No su
ch file or directory.
Apparently linuxefi.mod was removed in Fedora 29 and this change was ported to RHEL 8, most likely in git commit 2b792b0286b75976deceaf4b329310a90c4aa821 in the grub2 package (version-release 2.02-39). ReaR needs adjusting for that, see the linked upstream pull request.
Note: the linked issue is actually about multiple issues, the original issue was our bz1512493, the relevant discussion is at https://github.com/rear/rear/issues/1996#issuecomment-446389799.
Note for testing: add <key_value key="NETBOOT_METHOD" op="==" value="efigrub"/> to <hostRequires>.