rename file

modules/outputs/boot-extlinux.nix

@@ -0,0 +1,39 @@
+{
+  config
+, pkgs
+, lib
+, ...
+}:
+let
+  inherit (lib) mkIf mkEnableOption mkOption types concatStringsSep;
+  inherit (pkgs.pseudofile) dir symlink;
+  cfg = config.boot.loader.extlinux;
+  o = config.system.outputs;
+  cmdline = concatStringsSep " " config.boot.commandLine;
+  wantsDtb = config.hardware.dts ? src && config.hardware.dts.src != null;
+in {
+  options.boot.loader.extlinux.enable = mkEnableOption "extlinux";
+
+  config = mkIf cfg.enable {
+    system.outputs.bootfiles = pkgs.runCommand "extlinux" {} ''
+      mkdir $out
+      cd $out
+      ${if wantsDtb then "cp ${o.dtb} dtb" else "true"}
+      cp ${o.initramfs} initramfs
+      cp ${o.kernel.zImage} kernel
+      mkdir extlinux
+      cat > extlinux/extlinux.conf << _EOF
+      menu title Liminix
+      timeout 40
+      label Liminix
+        kernel /boot/kernel
+        # initrd /boot/initramfs
+        append ${cmdline} 
+        ${if wantsDtb then "fdt /boot/dtb" else ""}
+      _EOF
+    '';
+    filesystem = dir {
+      boot = symlink config.system.outputs.bootfiles;
+    };
+  };
+}