From f300ea69b66427bd2a5a92a4c4f0db0aa99392b0 Mon Sep 17 00:00:00 2001 From: Gregor Kleen Date: Mon, 31 Oct 2022 15:15:00 +0100 Subject: ... --- system-profiles/nfsroot.nix | 114 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 114 insertions(+) create mode 100644 system-profiles/nfsroot.nix (limited to 'system-profiles') diff --git a/system-profiles/nfsroot.nix b/system-profiles/nfsroot.nix new file mode 100644 index 00000000..92cf98de --- /dev/null +++ b/system-profiles/nfsroot.nix @@ -0,0 +1,114 @@ +{ config, pkgs, lib, flakeInputs, ... }: + +with lib; + +let + cfg = config.nfsroot; +in { + options = { + nfsroot = { + storeDevice = mkOption { + type = types.str; + default = "nfsroot:nix-store"; + }; + + registrationUrl = mkOption { + type = types.str; + default = "http://nfsroot/nix-registration"; + }; + }; + + system.build = { + storeContents = mkOption {}; + }; + }; + + config = { + # 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 ]); + + fileSystems."/" = mkImageMediaOverride + { fsType = "tmpfs"; + options = [ "mode=0755" ]; + }; + + # 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.extraOptions = '' + 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; + + + 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 + ''; + }; +} -- cgit v1.2.3