Revert "emacs: replace fetchFromSavannah with mirror; adjust build"

This reverts commit a019344338.

This commit needs some fixes.  Compared to adding fixes, I think it is
more clear and easier to read to revert it first and re-apply this
commit together with fixes as a whole.

pkgs/applications/editors/emacs/default.nix

@@ -13,7 +13,7 @@ lib.makeScope pkgs.newScope (
       inherit lib;
       inherit (pkgs)
         fetchFromBitbucket
-        fetchurl
+        fetchFromSavannah
         ;
     };
 

pkgs/applications/editors/emacs/make-emacs.nix

@@ -69,6 +69,7 @@
   # Boolean flags
   withNativeCompilation ? stdenv.buildPlatform.canExecute stdenv.hostPlatform,
   noGui ? false,
+  srcRepo ? true,
   withAcl ? false,
   withAlsaLib ? false,
   withAthena ? false,
@@ -199,11 +200,9 @@ mkDerivation (finalAttrs: {
     ];
 
   postPatch = lib.concatStringsSep "\n" [
-
-    # See: https://github.com/NixOS/nixpkgs/issues/170426
-    ''
-      find . -type f \( -name "*.elc" -o -name "*loaddefs.el" \) -exec rm {} \;
-    ''
+    (lib.optionalString srcRepo ''
+      rm -fr .git
+    '')
 
     # Add the name of the wrapped gvfsd
     # This used to be carried as a patch but it often got out of sync with
@@ -248,6 +247,11 @@ mkDerivation (finalAttrs: {
   nativeBuildInputs = [
     makeWrapper
     pkg-config
+  ]
+  ++ lib.optionals (variant == "macport") [
+    texinfo
+  ]
+  ++ lib.optionals srcRepo [
     autoreconfHook
     texinfo
   ]

pkgs/applications/editors/emacs/sources.nix

@@ -1,7 +1,7 @@
 {
   lib,
   fetchFromBitbucket,
-  fetchurl,
+  fetchFromSavannah,
 }:
 
 let
@@ -26,9 +26,9 @@ let
       src =
         {
           "mainline" = (
-            fetchurl {
-              url = "mirror://gnu/emacs/emacs-${rev}.tar.xz";
-              inherit hash;
+            fetchFromSavannah {
+              repo = "emacs";
+              inherit rev hash;
             }
           );
           "macport" = (
@@ -108,7 +108,7 @@ in
     version = "30.2";
     variant = "mainline";
     rev = "30.2";
-    hash = "sha256-s/NvGKbdJxVxM3AWYlfeL64B+dOM/oeM7Zsebe1b79k=";
+    hash = "sha256-3Lfb3HqdlXqSnwJfxe7npa4GGR9djldy8bKRpkQCdSA=";
     patches = fetchpatch: [
       (builtins.path {
         name = "inhibit-lexical-cookie-warning-67916.patch";