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Description of problem:
When keeping a kernel and initrd in a subdirectory under /boot, like the layout that is used for RHV-H, grubby-bls fails to process those entries because it strips the leading characters until the last /.


Version-Release number of selected component (if applicable):
grubby-8.40-37.el8.x86_64


How reproducible:
Always


Steps to Reproduce:
1. Run `grubby --add-kernel '/boot/test/kernel' --title 'test kernel' --bad-image-okay`
2. Inspect the new bls entry under /boot/loader/entries or using `grubby --info=ALL`


Actual results:
The new bls entry will contain /kernel and not /test/kernel


Expected results:
The new bls entry should contain /test/kernel

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 (grubby 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-2020:4502