pkgs: use filesets for src

This will make it possible later to specify which directories actually
need to be present to build a component, so changing a single file
somewhere won't force rebuilds of every Spectrum component.

Signed-off-by: Alyssa Ross <hi@alyssa.is>

1 files changed, 4 insertions, 1 deletions

diff --git a/img/app/default.nix b/img/app/default.nix
index fa282ab..57dcddb 100644
--- a/img/app/default.nix
+++ b/img/app/default.nix
@@ -78,7 +78,10 @@ in
 stdenvNoCC.mkDerivation {
   name = "spectrum-appvm";
 
-  inherit src;
+  src = lib.fileset.toSource {
+    root = ../..;
+    fileset = src;
+  };
   sourceRoot = "source/img/app";
 
   nativeBuildInputs = [ erofs-utils jq lseek s6-rc util-linux ];