From 489548310fa17ff9df9342fbffd38ac21ac74fc9 Mon Sep 17 00:00:00 2001
From: worldofpeace <worldofpeace@protonmail.ch>
Date: Sat, 28 Sep 2019 17:21:57 -0400
Subject: [PATCH] nixos/iso-image: add menu entry to disable display-manager

---
 nixos/modules/installer/cd-dvd/iso-image.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index 93c8ebaa2496..d62db0844584 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -284,6 +284,14 @@ let
         ${buildMenuAdditionalParamsGrub2 config "video=1920x1080@60"}
       }
 
+      # If we boot into a graphical environment where X is autoran
+      # and always crashes, it makes the media unusable. Allow the user
+      # to disable this.
+      submenu "Disable display-manager" --class quirk-disable-displaymanager {
+        ${grubMenuCfg}
+        ${buildMenuAdditionalParamsGrub2 config "systemd.mask=display-manager.service"}
+      }
+
       # Some laptop and convertibles have the panel installed in an
       # inconvenient way, rotated away from the keyboard.
       # Those entries makes it easier to use the installer.