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+# This file sets up the top-level package set by traversing the package tree
+# (see read-tree.nix for details) and constructing a matching attribute set
+# tree.
+#
+# This makes packages accessible via the Nixery instance that is configured to
+# use this repository as its nixpkgs source.
+
+{ ... }@args:
+
+with builtins;
+
+let
+  # This definition of fix is identical to <nixpkgs>.lib.fix, but the global
+  # package set is not available here.
+  fix = f: let x = f x; in x;
+
+  # Global configuration that all packages are called with.
+  config = depot: {
+    inherit depot;
+
+    # Pass third_party as 'pkgs' (for compatibility with external
+    # imports for certain subdirectories)
+    pkgs = depot.third_party;
+
+    kms = {
+      project = "tazjins-infrastructure";
+      region = "europe-north1";
+      keyring = "tazjins-keys";
+      key = "kontemplate-key";
+    };
+  };
+
+  readTree' = import ./nix/readTree {};
+
+  localPkgs = readTree: {
+    fun           = readTree ./fun;
+    nix           = readTree ./nix;
+    ops           = readTree ./ops;
+    lisp          = readTree ./lisp;
+    presentations = readTree ./presentations;
+    third_party   = readTree ./third_party;
+    tools         = readTree ./tools;
+    web           = readTree ./web;
+  };
+in fix(self: {
+  config = config self;
+
+  # Elevate 'lib' from nixpkgs
+  lib = import (self.third_party.nixpkgsSrc + "/lib");
+
+  # Expose readTree for downstream repo consumers.
+  readTree = {
+    __functor = x: (readTree' x.config);
+    config = self.config;
+  };
+}
+
+# Add local packages as structured by readTree
+// (localPkgs (readTree' (self.config // { inherit (self) lib; })))
+
+# Load overrides into the top-level.
+#
+# This can be used to move things from third_party into the top-level, too (such
+# as `lib`).
+// (readTree' { depot = self; pkgs = self.third_party; }) ./overrides
+)