112 lines
3.1 KiB
Nix
112 lines
3.1 KiB
Nix
# This module creates netboot media containing the given NixOS
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# configuration.
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{ config, lib, pkgs, ... }:
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with lib;
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{
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options = {
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netboot.storeContents = mkOption {
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example = literalExample "[ pkgs.stdenv ]";
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description = ''
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This option lists additional derivations to be included in the
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Nix store in the generated netboot image.
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'';
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};
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};
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config = {
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# Don't build the GRUB menu builder script, since we don't need it
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# here and it causes a cyclic dependency.
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boot.loader.grub.enable = false;
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# !!! Hack - attributes expected by other modules.
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environment.systemPackages = [ pkgs.grub2_efi ]
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++ (if pkgs.stdenv.hostPlatform.system == "aarch64-linux"
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then []
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else [ pkgs.grub2 pkgs.syslinux ]);
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fileSystems."/" =
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{ fsType = "tmpfs";
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options = [ "mode=0755" ];
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};
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# In stage 1, mount a tmpfs on top of /nix/store (the squashfs
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# image) to make this a live CD.
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fileSystems."/nix/.ro-store" =
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{ fsType = "squashfs";
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device = "../nix-store.squashfs";
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options = [ "loop" ];
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neededForBoot = true;
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};
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fileSystems."/nix/.rw-store" =
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{ fsType = "tmpfs";
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options = [ "mode=0755" ];
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neededForBoot = true;
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};
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fileSystems."/nix/store" =
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{ fsType = "overlay";
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device = "overlay";
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options = [
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"lowerdir=/nix/.ro-store"
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"upperdir=/nix/.rw-store/store"
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"workdir=/nix/.rw-store/work"
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];
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};
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boot.initrd.availableKernelModules = [ "squashfs" "overlay" ];
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boot.initrd.kernelModules = [ "loop" "overlay" ];
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# Closures to be copied to the Nix store, namely the init
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# script and the top-level system configuration directory.
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netboot.storeContents =
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[ config.system.build.toplevel ];
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# Create the squashfs image that contains the Nix store.
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system.build.squashfsStore = pkgs.callPackage ../../../lib/make-squashfs.nix {
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storeContents = config.netboot.storeContents;
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};
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# Create the initrd
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system.build.netbootRamdisk = pkgs.makeInitrd {
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inherit (config.boot.initrd) compressor;
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prepend = [ "${config.system.build.initialRamdisk}/initrd" ];
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contents =
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[ { object = config.system.build.squashfsStore;
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symlink = "/nix-store.squashfs";
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}
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];
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};
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system.build.netbootIpxeScript = pkgs.writeTextDir "netboot.ipxe" ''
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#!ipxe
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kernel ${pkgs.stdenv.hostPlatform.platform.kernelTarget} init=${config.system.build.toplevel}/init initrd=initrd ${toString config.boot.kernelParams}
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initrd initrd
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boot
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'';
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boot.loader.timeout = 10;
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boot.postBootCommands =
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''
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# After booting, register the contents of the Nix store
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# in the Nix database in the tmpfs.
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${config.nix.package}/bin/nix-store --load-db < /nix/store/nix-path-registration
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# nixos-rebuild also requires a "system" profile and an
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# /etc/NIXOS tag.
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touch /etc/NIXOS
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${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
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'';
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};
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}
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