agetty

modules/systemd/default.nix

@@ -1,9 +1,53 @@
 { pkgs, ... }:
 let
   inherit (pkgs.pseudofile) dir symlink;
+  "getty.service" = {
+    file =
+    let
+      login = pkgs.writeScript "login" ''
+        #!/bin/ash
+        exec /bin/ash
+      '';
+    in
+    ''
+      [Unit]
+      Description="Serial shell"
+
+      [Service]
+      ExecStart=${pkgs.util-linux}/bin/agetty --login-program ${login} ttyS0
+    '';
+    mode = "0644";
+  };
+  "default.target" = {
+    file = ''
+      [Unit]
+      Description="target to boot"
+      Wants=getty.service
+      After=getty.service
+      AllowIsolate=yes
+    '';
+  };
+  "sysinit.target" = {
+    file = ''
+      [Unit]
+      Description="sysinit.target"
+    '';
+  };
 in
 {
   config = {
+    kernel.config = {
+      CGROUPS = "y";
+      DEVTMPFS = "y";
+      INOTIFY_USER = "y";
+      SIGNALFD = "y";
+      TIMERFD = "y";
+      EPOLL = "y";
+      UNIX = "y";
+      SYSFS = "y";
+      PROC_FS = "y";
+      FHANDLE = "y";
+    };
     boot.commandLine = [
       "systemd.log_level=7"
       #"systemd.crash_shell=true"
@@ -11,9 +55,8 @@ in
     filesystem = dir {
       etc = dir {
         systemd = dir {
-          "system.conf" = {
-            file = '''';
-            mode = "0444";
+          system = dir {
+            inherit "default.target" "getty.service" "sysinit.target";
           };
         };
       };