cataclysmDDA: add utility function `attachPkgs`

4 files changed, 36 insertions, 16 deletions

diff --git a/pkgs/games/cataclysm-dda/default.nix b/pkgs/games/cataclysm-dda/default.nix
index ada212ea7e9f..1649cd031a4b 100644
--- a/pkgs/games/cataclysm-dda/default.nix
+++ b/pkgs/games/cataclysm-dda/default.nix
@@ -33,7 +33,8 @@ let
     buildMod
     buildSoundPack
     buildTileSet
-    wrapCDDA;
+    wrapCDDA
+    attachPkgs;
 
     inherit pkgs;
   };
diff --git a/pkgs/games/cataclysm-dda/git.nix b/pkgs/games/cataclysm-dda/git.nix
index 36f37f7aeba4..9af90481acda 100644
--- a/pkgs/games/cataclysm-dda/git.nix
+++ b/pkgs/games/cataclysm-dda/git.nix
@@ -1,4 +1,4 @@
-{ lib, callPackage, CoreFoundation, fetchFromGitHub, pkgs, wrapCDDA
+{ lib, callPackage, CoreFoundation, fetchFromGitHub, pkgs, wrapCDDA, attachPkgs
 , tiles ? true, Cocoa
 , debug ? false
 , useXdgDir ? false
@@ -26,11 +26,6 @@ let
       "VERSION=git-${version}-${lib.substring 0 8 src.rev}"
     ];
 
-    passthru = common.passthru // {
-      pkgs = pkgs.override { build = self; };
-      withMods = wrapCDDA self;
-    };
-
     meta = common.meta // {
       maintainers = with lib.maintainers;
       common.meta.maintainers ++ [ rardiol ];
@@ -38,4 +33,4 @@ let
   });
 in
 
-self
+attachPkgs pkgs self
diff --git a/pkgs/games/cataclysm-dda/lib.nix b/pkgs/games/cataclysm-dda/lib.nix
index 02678ed0228e..f2b38a16aa53 100644
--- a/pkgs/games/cataclysm-dda/lib.nix
+++ b/pkgs/games/cataclysm-dda/lib.nix
@@ -1,6 +1,6 @@
 { callPackage }:
 
-{
+rec {
   buildMod = callPackage ./builder.nix {
     type = "mod";
   };
@@ -14,4 +14,33 @@
   };
 
   wrapCDDA = callPackage ./wrapper.nix {};
+
+  # Required to fix `pkgs` and `withMods` attrs after applying `overrideAttrs`.
+  #
+  # Example:
+  #     let
+  #       myBuild = cataclysmDDA.jenkins.latest.tiles.overrideAttrs (_: {
+  #         x = "hello";
+  #       });
+  #
+  #       # This refers to the derivation before overriding! So, `badExample.x` is not accessible.
+  #       badExample = myBuild.withMods (_: []);
+  #
+  #       # `myBuild` is correctly referred by `withMods` and `goodExample.x` is accessible.
+  #       goodExample = let
+  #         inherit (cataclysmDDA) attachPkgs pkgs;
+  #       in
+  #       (attachPkgs pkgs myBuild).withMods (_: []);
+  #     in
+  #     goodExample.x  # returns "hello"
+  attachPkgs = pkgs: super:
+  let
+    self = super.overrideAttrs (old: {
+      passthru = old.passthru // {
+        pkgs = pkgs.override { build = self; };
+        withMods = wrapCDDA self;
+      };
+    });
+  in
+  self;
 }
diff --git a/pkgs/games/cataclysm-dda/stable.nix b/pkgs/games/cataclysm-dda/stable.nix
index 076a33a9e899..b83184865fbe 100644
--- a/pkgs/games/cataclysm-dda/stable.nix
+++ b/pkgs/games/cataclysm-dda/stable.nix
@@ -1,4 +1,4 @@
-{ lib, callPackage, CoreFoundation, fetchFromGitHub, pkgs, wrapCDDA
+{ lib, callPackage, CoreFoundation, fetchFromGitHub, pkgs, wrapCDDA, attachPkgs
 , tiles ? true, Cocoa
 , debug ? false
 , useXdgDir ? false
@@ -19,11 +19,6 @@ let
       sha256 = "15l6w6lxays7qmsv0ci2ry53asb9an9dh7l7fc13256k085qcg68";
     };
 
-    passthru = common.passthru // {
-      pkgs = pkgs.override { build = self; };
-      withMods = wrapCDDA self;
-    };
-
     meta = common.meta // {
       maintainers = with lib.maintainers;
       common.meta.maintainers ++ [ skeidel ];
@@ -31,4 +26,4 @@ let
   });
 in
 
-self
+attachPkgs pkgs self