Add wip netboot image gen

net-image/default.nix

@@ -0,0 +1,71 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [ ./net-image.nix ];
+
+  config = {
+    boot.loader.grub.enable = false;
+
+    boot.consoleLogLevel = lib.mkDefault 7;
+
+    boot.kernelParams = [
+      "rw"
+      "nfsroot=${config.netImage.nfsRoot}"
+      "ip=dhcp"
+      "root=/dev/nfs"
+      "rootwait"
+      "elevator=deadline"
+      "console=tty1"
+      "console=serial0,115200n8"
+      "init=/sbin/init"
+      "loglevel=7"
+    ];
+
+    netImage =
+      let
+        kernel-params = pkgs.writeTextFile {
+          name = "cmdline.txt";
+          text = ''
+            ${lib.strings.concatStringsSep " " config.boot.kernelParams}
+          '';
+        };
+        cfg = config.raspberry-pi-nix;
+        version = cfg.kernel-version;
+        board = cfg.board;
+        kernel = "${config.system.build.kernel}/${config.system.boot.loader.kernelFile}";
+        initrd = "${config.system.build.initialRamdisk}/${config.system.boot.loader.initrdFile}";
+        populate-kernel =
+          if cfg.uboot.enable
+          then ''
+            cp ${cfg.uboot.package}/u-boot.bin firmware/u-boot-rpi-arm64.bin
+          ''
+          else ''
+            cp "${kernel}" firmware/kernel.img
+            cp "${initrd}" firmware/initrd
+            cp "${kernel-params}" firmware/cmdline.txt
+          '';
+      in
+      {
+        populateFirmwareCommands = ''
+          ${populate-kernel}
+          cp -r ${pkgs.raspberrypifw}/share/raspberrypi/boot/{start*.elf,*.dtb,bootcode.bin,fixup*.dat,overlays} firmware
+          cp ${config.hardware.raspberry-pi.config-output} firmware/config.txt
+        '';
+        populateRootCommands =
+          if cfg.uboot.enable
+          then ''
+            mkdir -p ./files/boot
+            ${config.boot.loader.generic-extlinux-compatible.populateCmd} -c ${config.system.build.toplevel} -d ./files/boot
+          ''
+          else ''
+            mkdir -p ./files/sbin
+            content="$(
+              echo "#!${pkgs.bash}/bin/bash"
+              echo "exec ${config.system.build.toplevel}/init"
+            )"
+            echo "$content" > ./files/sbin/init
+            chmod 744 ./files/sbin/init
+          '';
+      };
+  };
+}