From f9b97b98e5455a8f3116ff81746f86d29b0b3531 Mon Sep 17 00:00:00 2001
From: dusk <y.bera003.06@protonmail.com>
Date: Thu, 31 Jul 2025 23:46:27 +0300
Subject: [PATCH] nix: modules: knot: add options for configuring motd
Change-Id: prrvqyztxwsumzomnorxnxqstlnqzyww

Signed-off-by: dusk <y.bera003.06@protonmail.com>
---
 nix/modules/knot.nix | 33 ++++++++++++++++++++++++++++++++-
 nix/vm.nix           |  1 +
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/nix/modules/knot.nix b/nix/modules/knot.nix
index 3dd510d..4797062 100644
--- a/nix/modules/knot.nix
+++ b/nix/modules/knot.nix
@@ -58,6 +58,28 @@ in
           };
         };
 
+        motd = mkOption {
+          type = types.nullOr types.str;
+          default = null;
+          description = ''
+            Message of the day
+
+            The contents are shown as-is; eg. you will want to add a newline if
+            setting a non-empty message since the knot won't do this for you.
+          '';
+        };
+
+        motdFile = mkOption {
+          type = types.nullOr types.path;
+          default = null;
+          description = ''
+            File containing message of the day
+
+            The contents are shown as-is; eg. you will want to add a newline if
+            setting a non-empty message since the knot won't do this for you.
+          '';
+        };
+
         server = {
           listenAddr = mkOption {
             type = types.str;
@@ -104,7 +126,15 @@ in
         cfg.package
       ];
 
-      system.activationScripts.gitConfig = ''
+      system.activationScripts.gitConfig = let
+        setMotd =
+          if cfg.motdFile != null && cfg.motd != null then
+            throw "motdFile and motd cannot be both set"
+          else ''
+            ${optionalString (cfg.motdFile != null) "cat ${cfg.motdFile} > ${cfg.stateDir}/motd"}
+            ${optionalString (cfg.motd != null) ''printf "${cfg.motd}" > ${cfg.stateDir}/motd''}
+          '';
+      in ''
         mkdir -p "${cfg.repo.scanPath}"
         chown -R ${cfg.gitUser}:${cfg.gitUser} "${cfg.repo.scanPath}"
 
@@ -116,6 +146,7 @@ in
         [receive]
             advertisePushOptions = true
         EOF
+        ${setMotd}
         chown -R ${cfg.gitUser}:${cfg.gitUser} "${cfg.stateDir}"
       '';
 
diff --git a/nix/vm.nix b/nix/vm.nix
index 7cee2c0..2f69fa9 100644
--- a/nix/vm.nix
+++ b/nix/vm.nix
@@ -48,6 +48,7 @@ nixpkgs.lib.nixosSystem {
       ];
       services.tangled-knot = {
         enable = true;
+        motd = "Welcome to the development knot!\n";
         server = {
           secretFile = "/var/lib/knot/secret";
           hostname = "localhost:6000";
-- 
2.43.0