push sheeet

ci/eval/chunk.nix

@@ -0,0 +1,45 @@
+# This turns ./outpaths.nix into chunks of a fixed size.
+{
+  lib ? import ../../lib,
+  path ? ../..,
+  # The file containing all available attribute paths, which are split into chunks here
+  attrpathFile,
+  chunkSize,
+  myChunk,
+  includeBroken,
+  systems,
+}:
+
+let
+  attrpaths = lib.importJSON attrpathFile;
+  myAttrpaths = lib.sublist (chunkSize * myChunk) chunkSize attrpaths;
+
+  unfiltered = import ./outpaths.nix {
+    inherit path;
+    inherit includeBroken systems;
+  };
+
+  # Turns the unfiltered recursive attribute set into one that is limited to myAttrpaths
+  filtered =
+    let
+      recurse =
+        index: paths: attrs:
+        lib.mapAttrs (
+          name: values:
+          if attrs ? ${name} then
+            if lib.any (value: lib.length value <= index + 1) values then
+              attrs.${name}
+            else
+              recurse (index + 1) values attrs.${name}
+              # Make sure nix-env recurses as well
+              // {
+                recurseForDerivations = true;
+              }
+          else
+            null
+        ) (lib.groupBy (a: lib.elemAt a index) paths);
+    in
+    recurse 0 myAttrpaths unfiltered;
+
+in
+filtered