Add nixos-23_{05,11} deps

Using the same methodology as in d56f05863d789423ff785cec654155d8495373a9, where
I add additional nixpkgs via an overlay, I added access to nixos-23.11. I also
renamed the nixpkgs-stable dep to be more appropriate, given that it comes from
the nixos-23.05 git branch. I'm nost totally sure about the naming of the attr
in the overlay, maybe it should be 'stable-23_11'? But I feel like for
discoverability purposes it should be the same as the name in deps, so I'll just
stick with that.

1 files changed, 26 insertions, 17 deletions

diff --git a/Biz/Bild/Nixpkgs.nix b/Biz/Bild/Nixpkgs.nix
index ecf50b9..8cb3448 100644
--- a/Biz/Bild/Nixpkgs.nix
+++ b/Biz/Bild/Nixpkgs.nix
@@ -9,36 +9,45 @@ let
 
   system = __currentSystem;
 
-in import sources.nixpkgs-stable {
+in import sources.nixos-23_05 {
   inherit system config;
   overlays = [
     (_: _: { inherit sources; })
-    (_: _: {
-      unstable = import sources.nixpkgs-unstable { inherit system config; };
-    })
-    (_: pkgs: {
+
+    # add some functions
+    (_: old: {
       # Given a generic `builder`, will generate an attrset for all the packages
       # pinned by `deps` with `builder` applied to the package. This attrset can
       # then be merged with the rest of the packages in the set as part of an
       # overlay or overrides.
       overridePinnedDeps = builder:
-        pkgs.lib.genAttrs (builtins.attrNames pkgs.sources) builder;
-    })
-    (_: pkgs: {
+        old.lib.genAttrs (builtins.attrNames sources) builder;
+
       # Modifies a derivation with our source and version, keeping old build
       # rules. This will fail if build steps have changed, or if no build
       # rules are available upstream.
       overrideSource = depName:
-        pkgs.${depName}.overrideAttrs (old:
-          old // rec {
-            version =
-              pkgs.sources.${depName}.version or pkgs.sources.${depName}.rev;
-            src = pkgs.sources.${depName};
-          });
+        if old ? "${depName}" && old.${depName} ? overrideAttrs then
+          old.${depName}.overrideAttrs (attrs:
+            attrs // rec {
+              version = sources.${depName}.version or sources.${depName}.rev;
+              src = sources.${depName};
+            })
+        else
+          null;
     })
-    (_: pkgs:
-      # override pinned deps with our sources
-      pkgs.overridePinnedDeps pkgs.overrideSource)
+
+    # override pinned deps with our sources, this must come before other
+    # package overlays, because of the 'null' above
+    (_: pkgs: pkgs.overridePinnedDeps pkgs.overrideSource)
+
+    # add other nixpkgs distributions
+    (_: _: {
+      unstable = import sources.nixpkgs-unstable { inherit system config; };
+      nixos-23_11 = import sources.nixos-23_11 { inherit system config; };
+    })
+
+    # add our hand-written derivations
     (import ./Deps.nix)
     (_: pkgs: { niv = import pkgs.sources.niv { }; })
   ];