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Description of problem:

The install scriptlet in %post was not choosing the correct
grubenv directory. In RHEL8, the efi and legacy bios grubenv
directories are different. This change assures that the 
correct directory is used for grub.cfg and related modules.
Added a %postun section to cleanup when removing tboot with
dnf erase.

Version-Release number of selected component (if applicable):

All RHEL-8 tboot

Additional info:

The z-stream candidate must be applied to all EUS RHEL-8 as well as RHEL-8.7.

Installed tboot on BIOS and UEFI systems. Installation was successful. Scriptlet chooses the right directory depending on the fw type. Removal was also clean and successful.

Setting Verified: Tested

tboot-1.10.5-2.el8 is in nightly compose RHEL-8.8.0-20221129.4
Moving to VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (tboot bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:2966