Add nixpkgs unstable as an overlay

There are just too many packages that I need that are in nixpkgs unstable and
aren't in the release branches. Using it as an overlay like this means I can
just refer to the packages I want from unstable without pulling in all the
changes.

1 files changed, 14 insertions, 7 deletions

diff --git a/Biz/Bild/Nixpkgs.nix b/Biz/Bild/Nixpkgs.nix
index e6d7d01..dff44a0 100644
--- a/Biz/Bild/Nixpkgs.nix
+++ b/Biz/Bild/Nixpkgs.nix
@@ -1,10 +1,21 @@
 let
   sources = import ./Sources.nix { sourcesFile = ./Sources.json; };
-in
-import sources.nixpkgs {
+
+  config = {
+    allowBroken = true;
+    allowUnfree = true;
+    cudaSupport = true;
+  };
+
   system = __currentSystem;
+
+in import sources.nixpkgs-stable {
+  inherit system config;
   overlays = [
     (_: _: { inherit sources; })
+    (_: _: { unstable = import sources.nixpkgs-unstable {
+      inherit system config;
+    };})
     (_: pkgs: {
       # Given a generic `builder`, will generate an attrset for all the packages
       # pinned by `deps` with `builder` applied to the package. This attrset can
@@ -29,9 +40,5 @@ import sources.nixpkgs {
     (import ./Deps.nix)
     (_: pkgs: { niv = import pkgs.sources.niv {}; })
   ];
-  config = {
-    allowBroken = true;
-    allowUnfree = true;
-    cudaSupport = true;
-  };
 }
+