machines: Patch "nomodeset" out of iso-image.nix.

This is a very hacky approach, because patching that file also requires
us to patch the imports it's referencing.

The first reason why I needed to patch is that there is no "modeset" you
can add to kernelParams and re-enable modesetting that way.

And the second reason is because we don't have something like mkRemove
or mkFilter in the module system, so we could filter out items from a
list.

Another option here would be to mkForce-override the kernelParams, which
would imply that we'd need to duplicate a lot of these options (for
example init=...).

So in the long run we surely need to have a better way to override
lists, but until that I'm leaving it with the patched approach.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/machines/default.nix b/machines/default.nix
index d1373ee9..b8986f43 100644
--- a/machines/default.nix
+++ b/machines/default.nix
@@ -11,8 +11,13 @@ let
     };
     iso = let
       isoModule = "${nixpkgs}/nixos/modules/installer/cd-dvd/iso-image.nix";
+      patchedModule = (import nixpkgs {}).runCommand "iso-image.nix" {} ''
+        sed -e 's|../../../lib/|${nixpkgs}/nixos/lib/|g' \
+            -e 's/"nomodeset"//g' \
+            "${isoModule}" > "$out"
+      '';
       wrapIso = { config, pkgs, lib, ... }@attrs: let
-        eval = (import isoModule attrs);
+        eval = (import patchedModule attrs);
         evalcfg = eval.config or {};
         bootcfg = evalcfg.boot or {};
         fscfg = evalcfg.fileSystems or {};