fix MTP support on KDE Plasma and Dolphin (#155405)

* fix MTP support on KDE Plasma and Dolphin

* Update pkgs/applications/kde/kio-extras.nix

Co-authored-by: ElXreno <elxreno@gmail.com>

Co-authored-by: Peter Hoeg <peter@hoeg.com>
Co-authored-by: ElXreno <elxreno@gmail.com>

nixos/modules/services/x11/desktop-managers/plasma5.nix

@@ -394,7 +394,8 @@ in
 
       # Extra UDEV rules used by Solid
       services.udev.packages = [
-        pkgs.libmtp
+        # libmtp has "bin", "dev", "out" outputs. UDEV rules file is in "out".
+        pkgs.libmtp.out
         pkgs.media-player-info
       ];
 

pkgs/applications/kde/kio-extras.nix

@@ -19,5 +19,12 @@ mkDerivation {
     kpty syntax-highlighting libmtp libssh openexr openslp
     phonon qtsvg samba solid gperf
   ];
+
+  # org.kde.kmtpd5 DBUS service launches kiod5 binary from kio derivation, not from kio-extras
+  postInstall = ''
+    substituteInPlace $out/share/dbus-1/services/org.kde.kmtpd5.service \
+      --replace Exec=$out Exec=${kio}
+  '';
+
   CXXFLAGS = [ "-I${ilmbase.dev}/include/OpenEXR" ];
 }