emacs.pkgs.elpaPackages/nongnuPackages: Use custom elpa fetcher

pkgs/applications/editors/emacs/elisp-packages/elpa-packages.nix

@@ -41,7 +41,10 @@ self: let
   }: let
 
     imported = import generated {
-      inherit (self) callPackage;
+      callPackage = pkgs: args: self.callPackage pkgs (args // {
+        # Use custom elpa url fetcher with fallback/uncompress
+        fetchurl = buildPackages.callPackage ./fetchelpa.nix { };
+      });
     };
 
     super = removeAttrs imported [ "dash" ];

pkgs/applications/editors/emacs/elisp-packages/nongnu-packages.nix

@@ -10,7 +10,7 @@ To update the list of packages from nongnu (ELPA),
 
 */
 
-{ lib }:
+{ lib, buildPackages }:
 
 self: let
 
@@ -19,7 +19,10 @@ self: let
   }: let
 
     imported = import generated {
-      inherit (self) callPackage;
+      callPackage = pkgs: args: self.callPackage pkgs (args // {
+        # Use custom elpa url fetcher with fallback/uncompress
+        fetchurl = buildPackages.callPackage ./fetchelpa.nix { };
+      });
     };
 
     super = imported;

pkgs/top-level/emacs-packages.nix

@@ -35,7 +35,8 @@ let
     inherit lib;
   };
 
-  mkNongnuPackages = { lib }: import ../applications/editors/emacs/elisp-packages/nongnu-packages.nix {
+  mkNongnuPackages = { pkgs, lib }: import ../applications/editors/emacs/elisp-packages/nongnu-packages.nix {
+    inherit (pkgs) buildPackages;
     inherit lib;
   };
 
@@ -62,7 +63,7 @@ in makeScope pkgs'.newScope (self: makeOverridable ({
   pkgs ? pkgs'
   , lib ? pkgs.lib
   , elpaPackages ? mkElpaPackages { inherit pkgs lib; } self
-  , nongnuPackages ? mkNongnuPackages { inherit lib; } self
+  , nongnuPackages ? mkNongnuPackages { inherit pkgs lib; } self
   , melpaStablePackages ? melpaGeneric { inherit pkgs lib; } "stable" self
   , melpaPackages ? melpaGeneric { inherit pkgs lib; } "unstable" self
   , orgPackages ? mkOrgPackages { inherit lib; } self