Description of problem:

--update-kernel=/path/to/vmlinuz returns an error

--set-default=/path/to/vmlinuz works fine. Same path.




Version-Release number of selected component (if applicable):
grubby-8.40-51.fc34.x86_64

How reproducible:
Always

Steps to Reproduce:
1. grubby --args=tonk --update-kernel=/boot/vmlinuz-5.11.14-300.fc34.x86_64
2.
3.

Actual results:

The param /boot/vmlinuz-5.11.14-300.fc34.x86_64 is incorrect


Expected results:

Should work.


Additional info:

--update-kernel=ALL succeeds and does the right thing as well.

Same problem happens with --remove-args=


grubby --remove-args=tonk --update-kernel=/boot/boot/vmlinuz-5.11.16-300.fc34.x86_64

That works. Hmm. Which means this is a variant and duplicate of bug 1940298.