nixos/iso-image.nix: add top-level /version.txt file

This makes it easy to identify which NixOS version is written to an USB stick without actually booting it.
NixOS · Sep 27, 2017 · 3c6eb3a · 3c6eb3a
1 parent 7cbf3a2
commit 3c6eb3a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -361,6 +361,9 @@ in
         { source = config.isoImage.splashImage;
           target = "/isolinux/background.png";
         }
+        { source = pkgs.writeText "version" config.system.nixosVersion;
+          target = "/version.txt";
+        }
       ] ++ optionals config.isoImage.makeEfiBootable [
         { source = efiImg;
           target = "/boot/efi.img";