modules/rust-motd: Generate the banner ahead of time

1 files changed, 9 insertions, 4 deletions

diff --git a/modules/by-name/ru/rust-motd/module.nix b/modules/by-name/ru/rust-motd/module.nix
index a6998f4..7f3b44f 100644
--- a/modules/by-name/ru/rust-motd/module.nix
+++ b/modules/by-name/ru/rust-motd/module.nix
@@ -19,6 +19,13 @@
     || v.openssh.authorizedKeys.keyFiles != []
   );
   userList = builtins.mapAttrs (n: v: 2) (lib.filterAttrs pred config.users.users);
+
+  bannerFile =
+    pkgs.runCommandNoCCLocal "banner-file" {
+      nativeBuildInputs = [pkgs.figlet];
+    } ''
+      echo "${config.system.name}" | figlet -f slant > "$out"
+    '';
 in {
   options.vhack.rust-motd = {
     enable = lib.mkEnableOption "rust-motd";
@@ -49,10 +56,8 @@ in {
 
         banner = {
           color = "red";
-          command = "${pkgs.hostname}/bin/hostname | ${pkgs.figlet}/bin/figlet -f slant";
-          # if you don't want a dependency on figlet, you can generate your
-          # banner however you want, put it in a file, and then use something like:
-          # command = "cat banner.txt"
+          # Avoid some runtime dependencies.
+          command = "cat ${bannerFile}";
         };
 
         uptime = {