include scripts in build of all-systems, add base.includeNixpkgs option

example/install.sh.md

@@ -12,5 +12,5 @@ This is a minimal example for a NixOS system installation function using the fun
 function install-system {( set -eu # 1: blockDev
     prepare-installer "$@"
     do-disk-setup "$1"
-    install-system-to $mnt prompt=true @{config.th.minify.topLevel:-}
+    install-system-to $mnt prompt=true
 )}

hosts/example.nix.md

@@ -49,11 +49,7 @@ in { imports = [ ({ ## Hardware
     fileSystems."/nix/store" = { options = ["bind,ro"]; device = "/system/nix/store"; neededForBoot = true; };
 
     # Some base config:
-    users.mutableUsers = false; users.allowNoPasswordLogin = true;
-    networking.hostId = lib.mkDefault (builtins.substring 0 8 (builtins.hashString "sha256" config.networking.hostName));
-    environment.etc."machine-id".text = (builtins.substring 0 32 (builtins.hashString "sha256" "${config.networking.hostName}:machine-id"));
-    boot.kernelParams = [ "panic=10" "boot.panic_on_fail" ]; # Reboot on kernel panic, panic if boot fails.
-    systemd.extraConfig = "StatusUnitFormat=name"; # Show unit names instead of descriptions during boot.
+    wip.base.enable = true; wip.base.includeNixpkgs = inputs.nixpkgs;
 
     # Static config for VBox Adapter 1 set to NAT (the default):
     networking.interfaces.enp0s3.ipv4.addresses = [ {

lib/flakes.nix

@@ -82,9 +82,11 @@ in rec {
 
             networking.hostName = name;
 
-            system.extraSystemBuilderCmds = if !config.boot.initrd.enable then "" else ''
+            system.extraSystemBuilderCmds = (if !config.boot.initrd.enable then "" else ''
                 ln -sT ${builtins.unsafeDiscardStringContext config.system.build.bootStage1} $out/boot-stage-1.sh # (this is super annoying to locate otherwise)
-            '';
+            '') + (if !inputs?self then "" else ''
+                ln -sT ${inputs.self.outPath} $out/config # (build input for reference)
+            '');
 
         }) ];
         specialArgs = specialArgs; # explicitly passing »pkgs« here breaks »config.nixpkgs.overlays«!
@@ -145,7 +147,7 @@ in rec {
     ... }: let
         otherArgs = (builtins.removeAttrs args [ "systems" ]) // { inherit systems overlays modules specialArgs scripts inputs configPath nixosSystem localSystem; };
         nixosConfigurations = if builtins.isList systems then mergeAttrsUnique (map (systems: mkNixosConfigurations (otherArgs // systems)) systems) else mkNixosConfigurations (otherArgs // systems);
-    in {
+    in let outputs = {
         inherit nixosConfigurations;
     } // (forEachSystem [ "aarch64-linux" "x86_64-linux" ] (localSystem: let
         pkgs = (import inputs.nixpkgs { inherit overlays; system = localSystem; });
@@ -212,6 +214,10 @@ in rec {
                 ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: system: (
                     "ln -sT ${system.config.system.build.toplevel} $out/systems/${name}"
                 )) nixosConfigurations)}
+                ${lib.optionalString (scripts != [ ]) ''
+                    mkdir -p $out/scripts
+                    ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: _: "ln -sT ${outputs.apps.${localSystem}.${name}.program} $out/scripts/${name}") nixosConfigurations)}
+                ''}
                 ${lib.optionalString (inputs != { }) ''
                     mkdir -p $out/inputs
                     ${lib.concatStringsSep "\n" (lib.mapAttrsToList (name: { outPath, ... }: "ln -sT ${outPath} $out/inputs/${name}") inputs)}
@@ -220,6 +226,6 @@ in rec {
             '';
         };
 
-    }));
+    })); in outputs;
 
 }

lib/setup-scripts/README.md

@@ -11,7 +11,7 @@ With the functions from here, adding a simple three-liner can be enough to do a
 function install-system {( set -eu # 1: blockDev
     prepare-installer "$@"
     do-disk-setup "$1"
-    install-system-to $mnt prompt=true @{config.th.minify.topLevel:-}
+    install-system-to $mnt prompt=true
 )}
 ```
 

modules/base.nix.md

@@ -16,6 +16,7 @@ in {
 
     options.${prefix} = { base = {
         enable = lib.mkEnableOption "saner defaults";
+        includeNixpkgs = lib.mkOption { description = "»nixpkgs« to include in the system build."; type = lib.types.nullOr lib.types.package; default = null; };
     }; };
 
     config = let
@@ -36,6 +37,16 @@ in {
         # might additionally want to do this: https://stackoverflow.com/questions/62083796/automatic-reboot-on-systemd-emergency-mode
         systemd.extraConfig = "StatusUnitFormat=name"; # Show unit names instead of descriptions during boot.
 
+
+    }) (lib.mkIf (cfg.includeNixpkgs != null) {
+
+        nix.registry.nixpkgs.flake = cfg.includeNixpkgs;
+        environment.etc."nix/channels/nixpkgs".source = cfg.includeNixpkgs.outPath;
+        nix.nixPath = [ "nixpkgs=/etc/nix/channels/nixpkgs" "nixos-config=/etc/nixos" ];
+        nix.extraOptions = "experimental-features = nix-command flakes"; # apparently, even nix 2.8 (in nixos-22.05) needs this
+        environment.shellAliases = { "with" = ''nix-shell --run "bash --login" -p''; };
+
+
     }) ({
         # Free convenience: