From cb5c4fcd3c5d4070f040d591b2dd1da580f234d1 Mon Sep 17 00:00:00 2001
From: Samuel Dionne-Riel <samuel@dionne-riel.com>
Date: Tue, 20 Apr 2021 17:11:21 -0400
Subject: iso-image: Hide rEFInd from menu in known non-working situations

Looks like GRUB has issues loading EFI binaries from (cd0), which is
what would be used in e.g. qemu with OVMF with `-cdrom`. Apparently also
what is used with AArch64 + U-Boot USB.
---
 nixos/modules/installer/cd-dvd/iso-image.nix | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

(limited to 'nixos')

diff --git a/nixos/modules/installer/cd-dvd/iso-image.nix b/nixos/modules/installer/cd-dvd/iso-image.nix
index 7dd3bf23933..7a4738599b0 100644
--- a/nixos/modules/installer/cd-dvd/iso-image.nix
+++ b/nixos/modules/installer/cd-dvd/iso-image.nix
@@ -365,11 +365,13 @@ let
     }
 
     ${lib.optionalString (refindBinary != null) ''
-    menuentry 'rEFInd' --class refind {
-      # UUID is hard-coded in the derivation.
-      search --set=root --no-floppy --fs-uuid 1234-5678
-      chainloader (\$root)/EFI/boot/${refindBinary}
-    }
+    # GRUB apparently cannot do "chainloader" operations on "CD".
+    if [ "\$root" != "cd0" ]; then
+      menuentry 'rEFInd' --class refind {
+        # \$root defaults to the drive the EFI is found on.
+        chainloader (\$root)/EFI/boot/${refindBinary}
+      }
+    fi
     ''}
     menuentry 'Firmware Setup' --class settings {
       fwsetup
-- 
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