nixos: Minor tweaks

nixos/modules/dynamic-motd.nix

@@ -10,7 +10,7 @@ in
 {
   options.my.dynamic-motd = with lib.types; {
     enable = mkBoolOpt' true "Whether to enable the dynamic message of the day PAM module.";
-    services = mkOpt' (listOf str) [ "login" "ssh" ] "PAM services to enable the dynamic message of the day module for.";
+    services = mkOpt' (listOf str) [ "login" "sshd" ] "PAM services to enable the dynamic message of the day module for.";
     script = mkOpt' (nullOr lines) null "Script that generates message of the day.";
   };
 

nixos/modules/network.nix

@@ -17,6 +17,7 @@ in
         # Explicitly unset fallback DNS (Nix module will not allow for a blank config)
         extraConfig = ''
           FallbackDNS=
+          Cache=no-negative
         '';
       };
     }

nixos/modules/tmproot.nix

@@ -109,6 +109,10 @@ in
           # These are set in environment.etc by the sshd module, but because their mode needs to be changed,
           # setup-etc will copy them instead of symlinking
           "/etc/ssh/authorized_keys.d"
+
+          # Auto-generated (on activation?)
+          "/root/.nix-channels"
+          "/root/.nix-defexpr"
         ];
         persistence.config = {
           # In impermanence the key in `environment.persistence.*` (aka name passed the attrsOf submodule) sets the

nixos/modules/user.nix

@@ -44,14 +44,23 @@ in
           _module.args.name = lib.mkForce user'.name;
         };
       };
-      tmproot.persistence.config =
+      tmproot = {
+        unsaved.ignore = [
+          # Auto-generated (on activation?)
+          "/home/${user'.name}/.nix-profile"
+          "/home/${user'.name}/.nix-defexpr"
+
+          "/home/${user'.name}/.config/fish/fish_variables"
+        ];
+        persistence.config =
         let
           perms = {
             mode = "0700";
             user = user.name;
             group = user.group;
           };
-      in {
+        in
+        {
           files = map (file: {
             inherit file;
             parentDirectory = perms;
@@ -67,6 +76,7 @@ in
           ];
         };
       };
+    };
 
     # mkAliasDefinitions will copy the unmerged defintions to allow the upstream submodule to deal with
     users.users.${user'.name} = mkAliasDefinitions options.my.user.config;