From 9248259708bd6ade5e334a2cdfb29d2a20acb0dd Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Mon, 3 Oct 2022 17:15:36 +0200
Subject: ...

---
 installer-profiles/nfsroot.nix | 95 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 installer-profiles/nfsroot.nix

(limited to 'installer-profiles/nfsroot.nix')

diff --git a/installer-profiles/nfsroot.nix b/installer-profiles/nfsroot.nix
new file mode 100644
index 00000000..9db415a8
--- /dev/null
+++ b/installer-profiles/nfsroot.nix
@@ -0,0 +1,95 @@
+{ config, pkgs, lib, flakeInputs, ... }:
+
+with lib;
+
+let
+  cfg = config.nfsroot;
+in {
+  imports = [
+    "${flakeInputs.nixpkgs.outPath}/nixos/modules/profiles/minimal.nix"
+    "${flakeInputs.nixpkgs.outPath}/nixos/modules/profiles/all-hardware.nix"
+    "${flakeInputs.nixpkgs.outPath}/nixos/modules/profiles/base.nix"
+    "${flakeInputs.nixpkgs.outPath}/nixos/modules/profiles/installation-device.nix"
+  ];
+
+  options = {
+    nfsroot = {
+      storeDevice = mkOption {
+        type = types.str;
+      };
+    };
+  };
+
+  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"
+        ];
+      };
+
+    boot.initrd.availableKernelModules = [ "nfs" "nfsv4" "overlay" ];
+    boot.initrd.supportedFilesystems = [ "nfs" "nfsv4" "overlay" ];
+
+    boot.initrd.network.enable = true;
+    boot.initrd.network.flushBeforeStage2 = false; # otherwise nfs dosen't work
+    networking.useDHCP = true;
+
+
+    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 =
+      ''
+        # 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
+      '';
+  };
+}
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