I'm a Fedora user and recently (from Fedora 33) I noted that GRUB switched to Boot Loader Specification (BLS) when it comes to managing boot entries.

My question: Is it a Fedora customization or a regular feature of GNU GRUB?

2 Answers 2


GNU GRUB does not support BLS natively:

# git clone https://git.savannah.gnu.org/git/grub.git
# cd grub/
# find . -type f -print0 | xargs -0 fgrep -ai "boot loader spec" 
Exit 123
# find . -type f -print0 | xargs -0 fgrep -ai "bootloaderspec"
Exit 123
# find . -type f -print0 | xargs -0 fgrep -ail "bls"

There have, however, been forks to implement the functionality



In addition to @Ned64 answer you can simply check the source files https://src.fedoraproject.org/rpms/grub2/tree/rawhide and see that Fedora does extensively patch GRUB to offer this feature.

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