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|
{ config, options, pkgs, lib, flake, flakeInputs, ... }:
with lib;
let
cfg = config.nfsroot;
in {
imports = with flake.nixosModules.systemProfiles; [
tmpfs-root
];
options = {
nfsroot = {
storeDevice = mkOption {
type = types.str;
default = "nfsroot:nix-store";
description = "Nix store device";
};
registrationUrl = mkOption {
type = types.str;
default = "http://nfsroot/nix-registration";
description = "Url of nix store registrations";
};
};
system.build = {
storeContents = mkOption {
description = "Contents of nix store";
};
};
};
config = foldr recursiveUpdate {} ([
{
# Don't build the GRUB menu builder script, since we don't need it
# here and it causes a cyclic dependency.
boot.loader.grub.enable = false;
# !!! Hack - attributes expected by other modules.
environment.systemPackages = [ pkgs.grub2_efi ]
++ (if pkgs.stdenv.hostPlatform.system == "aarch64-linux"
then []
else [ pkgs.grub2 pkgs.syslinux ]);
# In stage 1, mount a tmpfs on top of /nix/store (the squashfs
# image) to make this a live CD.
fileSystems."/nix/.ro-store" = mkImageMediaOverride
{ fsType = "nfs4";
device = cfg.storeDevice;
options = [ "ro" ];
neededForBoot = true;
};
fileSystems."/nix/.rw-store" = mkImageMediaOverride
{ fsType = "tmpfs";
options = [ "mode=0755" ];
neededForBoot = true;
};
fileSystems."/nix/store" = mkImageMediaOverride
{ fsType = "overlay";
device = "overlay";
options = [
"lowerdir=/nix/.ro-store"
"upperdir=/nix/.rw-store/store"
"workdir=/nix/.rw-store/work"
];
depends = [
"/nix/.ro-store"
"/nix/.rw-store/store"
"/nix/.rw-store/work"
];
};
nix.settings.use-sqlite-wal = false;
boot.initrd.availableKernelModules = [ "nfs" "nfsv4" "overlay" ];
boot.initrd.supportedFilesystems = [ "nfs" "nfsv4" "overlay" ];
services.rpcbind.enable = mkImageMediaOverride false;
boot.initrd.network.enable = true;
boot.initrd.network.flushBeforeStage2 = false; # otherwise nfs doesn't work
boot.initrd.postMountCommands = ''
mkdir -p /mnt-root/etc/
cp /etc/resolv.conf /mnt-root/etc/resolv.conf
'';
networking.useDHCP = true;
networking.resolvconf.enable = false;
networking.dhcpcd.persistent = true;
system.build.storeContents = [config.system.build.toplevel];
system.build.netbootIpxeScript = pkgs.writeTextDir "netboot.ipxe" ''
#!ipxe
# Use the cmdline variable to allow the user to specify custom kernel params
# when chainloading this script from other iPXE scripts like netboot.xyz
kernel ${pkgs.stdenv.hostPlatform.linux-kernel.target} init=${config.system.build.toplevel}/init initrd=initrd ${toString config.boot.kernelParams} ''${cmdline}
initrd initrd
boot
'';
boot.postBootCommands =
''
# After booting, register the contents of the Nix store on NFS
# in the Nix database in the tmpfs.
${pkgs.curl}/bin/curl ${escapeShellArg cfg.registrationUrl} | ${config.nix.package.out}/bin/nix-store --load-db
# nixos-rebuild also requires a "system" profile and an
# /etc/NIXOS tag.
touch /etc/NIXOS
${config.nix.package}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
'';
boot.initrd.systemd.enable = false;
}
] ++ (optional (options ? system.etc) {
system.etc.overlay.enable = false;
}) ++ (optional (options ? system.sysusers) {
systemd.sysusers.enable = false;
}));
}
|
