nixos/iso-image: add an option to disable BIOS boot

This change adds an option to disable legacy BIOS boot support for ISO
images. The implementation uses syslinux package that currently does not
support non-x86 platforms and thus cannot be cross-compiled, e.g. from
AArch64 system.

Changed files
+16 -6
nixos
modules
+3
nixos/modules/installer/cd-dvd/installation-cd-base.nix
···
# ISO naming.
isoImage.isoName = "${config.isoImage.isoBaseName}-${config.system.nixos.label}-${pkgs.stdenv.hostPlatform.system}.iso";
+
# BIOS booting
+
isoImage.makeBiosBootable = true;
+
# EFI booting
isoImage.makeEfiBootable = true;
+13 -6
nixos/modules/installer/cd-dvd/iso-image.nix
···
'';
};
+
isoImage.makeBiosBootable = mkOption {
+
default = false;
+
description = lib.mdDoc ''
+
Whether the ISO image should be a BIOS-bootable disk.
+
'';
+
};
+
isoImage.makeEfiBootable = mkOption {
default = false;
description = lib.mdDoc ''
···
boot.loader.grub.enable = false;
environment.systemPackages = [ grubPkgs.grub2 grubPkgs.grub2_efi ]
-
++ optional canx86BiosBoot pkgs.syslinux
+
++ optional (config.isoImage.makeBiosBootable && canx86BiosBoot) pkgs.syslinux
;
# In stage 1 of the boot, mount the CD as the root FS by label so
···
{ source = pkgs.writeText "version" config.system.nixos.label;
target = "/version.txt";
}
-
] ++ optionals canx86BiosBoot [
+
] ++ optionals (config.isoImage.makeBiosBootable && canx86BiosBoot) [
{ source = config.isoImage.splashImage;
target = "/isolinux/background.png";
}
···
{ source = config.isoImage.efiSplashImage;
target = "/EFI/boot/efi-background.png";
}
-
] ++ optionals (config.boot.loader.grub.memtest86.enable && canx86BiosBoot) [
+
] ++ optionals (config.boot.loader.grub.memtest86.enable && config.isoImage.makeBiosBootable && canx86BiosBoot) [
{ source = "${pkgs.memtest86plus}/memtest.bin";
target = "/boot/memtest.bin";
}
···
# Create the ISO image.
system.build.isoImage = pkgs.callPackage ../../../lib/make-iso9660-image.nix ({
inherit (config.isoImage) isoName compressImage volumeID contents;
-
bootable = canx86BiosBoot;
+
bootable = config.isoImage.makeBiosBootable && canx86BiosBoot;
bootImage = "/isolinux/isolinux.bin";
-
syslinux = if canx86BiosBoot then pkgs.syslinux else null;
-
} // optionalAttrs (config.isoImage.makeUsbBootable && canx86BiosBoot) {
+
syslinux = if config.isoImage.makeBiosBootable && canx86BiosBoot then pkgs.syslinux else null;
+
} // optionalAttrs (config.isoImage.makeUsbBootable && config.isoImage.makeBiosBootable && canx86BiosBoot) {
usbBootable = true;
isohybridMbrImage = "${pkgs.syslinux}/share/syslinux/isohdpfx.bin";
} // optionalAttrs config.isoImage.makeEfiBootable {