Add welcome message

flake.nix

@@ -26,49 +26,55 @@
       };
       nixosModules.default = self.nixosModules.wsl;
 
-      nixosConfigurations = {
-        modern = nixpkgs.lib.nixosSystem {
-          system = "x86_64-linux";
-          modules = [
-            self.nixosModules.default
-            { wsl.enable = true; }
-          ];
-        };
+      nixosConfigurations =
+        let
+          initialConfig = {
+            wsl.enable = true;
 
-        legacy = nixpkgs.lib.nixosSystem {
-          system = "x86_64-linux";
-          modules = [
-            self.nixosModules.default
-            {
-              wsl.enable = true;
-              wsl.nativeSystemd = false;
-            }
-          ];
-        };
+            programs.bash.loginShellInit = "nixos-wsl-welcome";
+          };
+        in
+        {
+          modern = nixpkgs.lib.nixosSystem {
+            system = "x86_64-linux";
+            modules = [
+              self.nixosModules.default
+              initialConfig
+            ];
+          };
+
+          legacy = nixpkgs.lib.nixosSystem {
+            system = "x86_64-linux";
+            modules = [
+              self.nixosModules.default
+              initialConfig
+              { wsl.nativeSystemd = false; }
+            ];
+          };
 
-        test = nixpkgs.lib.nixosSystem {
-          system = "x86_64-linux";
-          modules = [
-            self.nixosModules.default
-            ({ config, pkgs, ... }: {
-              wsl.enable = true;
-              wsl.nativeSystemd = false;
+          test = nixpkgs.lib.nixosSystem {
+            system = "x86_64-linux";
+            modules = [
+              self.nixosModules.default
+              ({ config, pkgs, ... }: {
+                wsl.enable = true;
+                wsl.nativeSystemd = false;
 
-              system.activationScripts.create-test-entrypoint.text =
-                let
-                  syschdemdProxy = pkgs.writeShellScript "syschdemd-proxy" ''
-                    shell=$(${pkgs.glibc.bin}/bin/getent passwd root | ${pkgs.coreutils}/bin/cut -d: -f7)
-                    exec $shell $@
+                system.activationScripts.create-test-entrypoint.text =
+                  let
+                    syschdemdProxy = pkgs.writeShellScript "syschdemd-proxy" ''
+                      shell=$(${pkgs.glibc.bin}/bin/getent passwd root | ${pkgs.coreutils}/bin/cut -d: -f7)
+                      exec $shell $@
+                    '';
+                  in
+                  ''
+                    mkdir -p /bin
+                    ln -sfn ${syschdemdProxy} /bin/syschdemd
                   '';
-                in
-                ''
-                  mkdir -p /bin
-                  ln -sfn ${syschdemdProxy} /bin/syschdemd
-                '';
-            })
-          ];
+              })
+            ];
+          };
         };
-      };
 
     } //
     flake-utils.lib.eachSystem

modules/default.nix

@@ -6,6 +6,7 @@
     ./recovery.nix
     ./systemd
     ./version.nix
+    ./welcome.nix
     ./wsl-conf.nix
     ./wsl-distro.nix
 

modules/welcome.nix

@@ -0,0 +1,22 @@
+{ lib, pkgs, config, ... }:
+let
+  welcomeMessage = pkgs.writeText "nixos-wsl-welcome-message" ''
+    Welcome to your new NixOS-WSL system!
+
+    Please run `sudo nix-channel --update` and `sudo nixos-rebuild switch` now, to ensure you're running the latest NixOS and NixOS-WSL versions.
+
+    If you run into issues, please report them on our Github page at https://github.com/nix-community/NixOS-WSL or come talk to us on Matrix at #wsl:nixos.org.
+
+    ❄️ Enjoy NixOS-WSL! ❄️
+
+    Note: this message will disappear after you rebuild your system. If you want to see it again, run `nixos-wsl-welcome`.
+  '';
+  welcome = pkgs.writeShellScriptBin "nixos-wsl-welcome" ''
+    cat ${welcomeMessage}
+  '';
+in
+{
+  config = lib.mkIf config.wsl.enable {
+    environment.systemPackages = [ welcome ];
+  };
+}