feat(modules/system/issue_file): Add the last modification date

1 files changed, 20 insertions, 6 deletions

diff --git a/modules/system/services/issue_file/default.nix b/modules/system/services/issue_file/default.nix
index 930be1d9..d8b6faa8 100644
--- a/modules/system/services/issue_file/default.nix
+++ b/modules/system/services/issue_file/default.nix
@@ -1,4 +1,17 @@
-{config, ...}: {
+{
+  config,
+  self,
+  pkgs,
+  lib,
+  ...
+}: let
+  lastModifiedFile = pkgs.runCommandLocal "formatDate" {} ''
+    date --date='@${builtins.toString self.sourceInfo.lastModified}' +'%F %T' > $out
+  '';
+  lastModified = lib.strings.replaceStrings ["\n"] [""] (
+    builtins.readFile lastModifiedFile
+  );
+in {
   environment.etc.issue = {
     # Friendly greeting on the virtual consoles.
     text = ''
@@ -27,11 +40,12 @@
        NixOS ${config.system.nixos.label} 
         --------------
       
-        date: \d
-        time: \t
-        ipv4: \4
-        ipv6: \6
-        tty: \l
+        last update: ${lastModified}
+               date: \d
+               time: \t
+               ipv4: \4
+               ipv6: \6
+                tty: \l
       
     '';
   };