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bootpart-uefi-x86_64: clean up the package and config

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Colin
2025-08-10 05:17:59 +00:00
parent f8eec18429
commit 38899ce392
2 changed files with 33 additions and 14 deletions
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26
pkgs/by-name/bootpart-uefi-x86_64/package.nix
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@@ -1,3 +1,5 @@
# DEBUGGING
# - if it fails to load menu.c32, or anything, just type 'nixos-default', to boot the default entry.
{ {
runCommandLocal, runCommandLocal,
syslinux, syslinux,
@@ -37,21 +39,17 @@ runCommandLocal "bootpart-uefi-x86_64" {
}; };
} '' } ''
# populate the EFI directory with syslinux, and configure it to read the extlinux.conf file managed by nixos. # populate the EFI directory with syslinux, and configure it to read the extlinux.conf file managed by nixos.
mkdir -p $out/EFI/syslinux # i populate two entries: /EFI/syslinux, for EFI-program-aware bootloaders (which may host multiple EFI programs),
cp -R ${syslinux'}/share/syslinux/efi64/* $out/EFI/syslinux/ # and /EFI/BOOT/BOOTX64.EFI, for older bootloaders that hardcode the EFI program to load.
install -Dm644 ${./EFI/syslinux/syslinux.cfg} $out/EFI/syslinux/syslinux.cfg for entry in BOOT syslinux; do
mkdir -p $out/EFI/$entry
# create the EFI/BOOT/BOOTX64.EFI default entry. cp -R ${syslinux'}/share/syslinux/efi64/* $out/EFI/$entry
# except for systems with multiple bootloaders, this is the entry the BIOS will actually boot, install -Dm644 ${./EFI/syslinux/syslinux.cfg} $out/EFI/$entry/syslinux.cfg
# and nothing in /EFI/syslinux is actually read during any part of boot. if [ "$entry" = "BOOT" ]; then
# but keep /EFI/syslinux around, so that one can copy the .c32 modules out of it mv $out/EFI/$entry/syslinux.efi $out/EFI/$entry/BOOTX64.EFI
# (and into /syslinux/) to configure runtime features like menuing. fi
install -Dm644 $out/EFI/syslinux/syslinux.efi $out/EFI/BOOT/BOOTX64.EFI done
# install the ldlinux runtime dependency, else it hangs at a black screen
install -Dm644 $out/EFI/syslinux/ldlinux.e64 $out/EFI/BOOT/ldlinux.e64
# we create this "trampoline" layer so that we can setup the UI directive # we create this "trampoline" layer so that we can setup the UI directive
# and enable a menu before loading the real, nixos-managed extlinux.conf.
install -Dm644 ${syslinux'}/share/syslinux/efi64/menu.c32 $out/syslinux/menu.c32
install -Dm644 ${./syslinux/syslinux.cfg} $out/syslinux/syslinux.cfg install -Dm644 ${./syslinux/syslinux.cfg} $out/syslinux/syslinux.cfg
'' ''

21
pkgs/by-name/bootpart-uefi-x86_64/syslinux/syslinux.cfg
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@@ -1,2 +1,23 @@
# ABOUT THE /boot LAYOUT:
# /EFI/syslinux/syslinux.efi: EFI entrypoint which modern bootloaders should hand off to.
# /EFI/BOOT/BOOTX64.EFI: fallback EFI entrypoint for older firmware which doesn't know
# how to locate EFI programs, and hardcodes entries instead.
#
# for either .efi, the entrypoint first loads from its same directory:
# - ldlinux.e64
# - syslinux.cfg
# in both cases, the syslinux.cfg loaded "trampolines" here, to /syslinux/syslinux.cfg.
#
# within this file, we can configure the UI mode (e.g. barebones prompt, curses-like 'menu.c32'),
# add boot entries (e.g. a memtest entry), and so on.
# N.B.: .c32 files mentioned here are loaded on-demand, from either the current directory *or*
# the .efi's original directory in /EFI/...
#
# known menus:
# - UI cmenu.c32: fails to load: `Undef symbol FAIL: memset`
# - UI vesamenu.c32: fails to load: `Undef symbol FAIL: memset`
# - UI menu.c32: works, basic fixed-size curses-like menu
#
UI menu.c32 UI menu.c32
INCLUDE ../extlinux/extlinux.conf INCLUDE ../extlinux/extlinux.conf