nixos/locate: rip out dbfile overrides

All the locate versions we have support LOCATE_PATH, so just use that
instead of adding indirections all over the place AND forcing people
to rebuild their locate implementation if they want the path changed.

nixos/modules/misc/locate.nix

@@ -230,9 +230,9 @@ in
         plocate = (mkIf isPLocate (mkMerge [ common plocate ]));
       };
 
-    environment.systemPackages = [ (cfg.locate.override { dbfile = cfg.output; }) ];
+    environment.systemPackages = [ cfg.locate ];
 
-    environment.variables = mkIf (!isMorPLocate) { LOCATE_PATH = cfg.output; };
+    environment.variables.LOCATE_PATH = cfg.output;
 
     environment.etc = {
       # write /etc/updatedb.conf for manual calls to `updatedb`

pkgs/tools/misc/mlocate/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, config, dbfile ? config.locate.dbfile or "/var/cache/locatedb" }:
+{ lib, stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
   pname = "mlocate";
@@ -9,9 +9,6 @@ stdenv.mkDerivation rec {
     sha256 = "0gi6y52gkakhhlnzy0p6izc36nqhyfx5830qirhvk3qrzrwxyqrh";
   };
 
-  buildInputs = [ ];
-  makeFlags = [ "dbfile=${dbfile}" ];
-
   meta = with lib; {
     description = "Merging locate is an utility to index and quickly search for files";
     homepage = "https://pagure.io/mlocate";

pkgs/tools/misc/plocate/default.nix

@@ -1,5 +1,4 @@
-{ config
-, stdenv
+{ stdenv
 , lib
 , fetchgit
 , pkg-config
@@ -8,7 +7,6 @@
 , systemd
 , liburing
 , zstd
-, dbfile ? config.locate.dbfile or "/var/cache/locatedb"
 }:
 stdenv.mkDerivation rec {
   pname = "plocate";
@@ -31,8 +29,6 @@ stdenv.mkDerivation rec {
 
   mesonFlags = [
     "-Dsystemunitdir=${placeholder "out"}/etc/systemd/system"
-    "-Dsharedstatedir=${builtins.dirOf dbfile}"
-    "-Ddbpath=${builtins.baseNameOf dbfile}"
   ];
 
   meta = with lib; {