Cannot remove systemd-boot in favor of GRUB

[crawfordlong]

This is a strange one, and I'm not even sure what to provide to troubleshoot the issue. The very short version is that:

• My NixOS installation was previously using systemd-boot
• I decided I wanted to switch back to GRUB in order to customize the boot entries
• I changed all my configs to reference GRUB (and disable systemd-boot)
• I have successfully rebuilt the system with no errors (and a review of the installation log shows GRUB installing)
• BUT when rebooting, systemd-boot is still enabled.

Some of the sources I found suggested adding the following to my config:

boot.loader.efi.canTouchEfiVariables = false;
boot.loader.grub.efiInstallAsRemovable = true;

But the apple-silicon-support flake already includes these options with opposite values.

Anyone ever run into a zombie systemd-boot setup and successfully remove it?

[teevik]

Not sure if the same issue, but i had to use --install-bootloader when changing from grub to systemd-boot for it to actually change:

sudo nixos-rebuild boot --flake .#macbook --install-bootloader

[flokli]

Using grub is a bit out of scope, let's convert this to a discussion.