const GRUB_DIRS: [&str; 2];Expand description
Directories where GRUB keeps its own configuration and modules. Their
presence means GRUB owns the boot flow even if BLS Type 1 entries also
exist, because GRUB can consume those entries itself via the blscfg
module — Fedora and RHEL enable exactly that with
GRUB_ENABLE_BLSCFG=true. /boot/grub2 is the Fedora/RHEL path,
/boot/grub the Debian/Ubuntu one.