modules/base.nix

@@ -134,7 +134,10 @@ in {
 
     # Set the useful PS1 prompt by default.
     defaultProfile.environmentVariables.PS1 = lib.mkDefault config.defaultProfile.prompt;
-    defaultProfile.packages = with pkgs; [ execline ];
+    defaultProfile.packages = with pkgs; [
+      # execline
+      systemd
+    ];
 
     boot.commandLine = [
       "panic=10 oops=panic init=/bin/init loglevel=8"

modules/busybox.nix

@@ -51,7 +51,7 @@ let
 in {
   options = {
     programs.busybox = {
-      applets =  mkOption {
+      applets = mkOption {
         type = types.listOf types.str;
         description = "Applets required";
         default = [];
@@ -62,13 +62,19 @@ in {
         # other strings are also used
         description = "Other busybox config flags that do not map directly to applet names (often prefixed FEATURE_)";
         type = types.attrsOf types.nonEmptyStr;
-        default =  { };
+        default = { };
-        example =  { FEATURE_DD_IBS_OBS = "y"; };
+        example = { FEATURE_DD_IBS_OBS = "y"; };
+      };
+      package = mkOption {
+        type = types.package;
+        readOnly = true;
+        internal = true;
       };
     };
   };
   config = {
     programs.busybox = {
+      package = busybox;
       applets = minimalApplets;
       options = {
         ASH_ECHO = "y";

modules/systemd/default.nix

@@ -19,7 +19,7 @@ let
     serviceToUnit
     ;
 
-  systemd-types = import ./types.nix { inherit pkgs utils lib; };
+  systemd-types = import ./types.nix { inherit pkgs utils lib; busybox = config.programs.busybox.package; };
 
   units-texts = mapAttrs' (
     _: unit:
@@ -103,7 +103,6 @@ in
             Before = [ "default.target" ];
           };
           script = ''
-            #!/bin/ash
             # . /etc/profile
             exec /bin/ash < /dev/ttyS0 > /dev/ttyS0 2> /dev/ttyS0
           '';

modules/systemd/types.nix

@@ -1,7 +1,8 @@
 {
   pkgs,
   lib,
-  utils
+  utils,
+  busybox
 }:
 let
   inherit (utils.systemdUtils.lib) serviceConfig unitConfig;
@@ -10,7 +11,8 @@ let
     imports = [ serviceConfig ];
     # Default path for systemd services. Should be quite minimal.
     config.path = lib.mkAfter [
-      pkgs.coreutils
+      busybox
+      # pkgs.coreutils
       # pkgs.gnugrep
       # pkgs.gnused
       pkgs.systemd

overlay.nix

@@ -335,8 +335,28 @@ extraPkgs // {
       };
     }) { };
 
+  writeShellScriptBin = name: text:
+    final.writeTextFile {
+      inherit name;
+      executable = true;
+      destination = "/bin/${name}";
+      text = ''
+        #!/bin/ash
+        ${text}
+      '';
+      checkPhase = ''
+        ${final.stdenv.shellDryRun} "$target"
+      '';
+      meta.mainProgram = name;
+    };
+
   systemd =
     let base = prev.systemd.override {
+      kbd = "";
+      coreutils = "";
+      bash = null;
+      bashInteractive = "";
+
       withAcl = false;
       withAnalyze = false;
       withApparmor = false;
@@ -389,6 +409,17 @@ extraPkgs // {
       #  "--optimization=s"
         "--default-library=static"
         "--buildtype=minsize"
+        # (final.lib.mesonBool "static-libsystemd" true)
+        # (final.lib.mesonBool "standalone-binaries" true)
+
+      #  (final.lib.mesonBool "link-udev-shared" false)
+      #  (final.lib.mesonBool "link-executor-shared" false)
+      #  (final.lib.mesonBool "link-systemctl-shared" false)
+      #  (final.lib.mesonBool "link-networkd-shared" false)
+      #  (final.lib.mesonBool "link-timesyncd-shared" false)
+      #  (final.lib.mesonBool "link-journalctl-shared" false)
+      #  (final.lib.mesonBool "link-boot-shared" false)
+      #  (final.lib.mesonBool "link-portabled-shared" false)
       ];
       postInstall = o.postInstall + ''
         rm -rf $out/share
@@ -438,6 +469,9 @@ extraPkgs // {
         rm $out/bin/systemd-sysext
         rm $out/bin/systemd-tty-ask-password-agent
         rm $out/bin/systemd-vpick
+
+        # rm $out/lib/libsystemd.a
+        # rm $out/lib/systemd/libsystemd-shared-256.so
       '';
     });