overlay systemd to minimal

flake.nix

@@ -9,6 +9,48 @@
       crossSystem = "aarch64-linux";
       pkgs = import nixpkgs {
         inherit system;
+
+        overlays = [
+          (self: super: {
+            systemd = super.systemd.override {
+              pname = "systemd-minimal";
+              withAcl = false;
+              withAnalyze = false;
+              withApparmor = false;
+              withAudit = false;
+              withCompression = false;
+              withCoredump = false;
+              withCryptsetup = false;
+              withDocumentation = false;
+              withEfi = false;
+              withFido2 = false;
+              withHostnamed = false;
+              withHomed = false;
+              withHwdb = false;
+              withImportd = false;
+              withLibBPF = false;
+              withLibidn2 = false;
+              withLocaled = false;
+              withLogind = false;
+              withMachined = false;
+              withNetworkd = false;
+              withNss = false;
+              withOomd = false;
+              withPCRE2 = false;
+              withPam = false;
+              withPolkit = false;
+              withPortabled = false;
+              withRemote = false;
+              withResolved = false;
+              withShellCompletions = false;
+              withTimedated = false;
+              withTimesyncd = false;
+              withTpm2Tss = false;
+              withUserDb = false;
+            };
+          })
+        ];
+
         crossSystem = {
           gcc.cpu = "cortex-a53";
           config = "aarch64-unknown-linux-gnu";

triviOS/default.nix

@@ -51,4 +51,8 @@
     doc.enable = false;
     info.enable = false;
   };
+
+  services.timesyncd.enable = false;
+  systemd.oomd.enable = false;
+  systemd.coredump.enable = false;
 }