megapixels: search for postprocessing programs in NixOS specific global location

    zbar

  ];

  patches = [

    # In the settings menu of Megapixels the user can select a different postprocessing script. The path to the script is then stored in a dconf setting. If the path changes, for example because it is in the Nix store and a dependency of the postprocessor changes, Megapixels will try to use this now non-existing old path. This will cause Megapixels to not save any images that were taken until the user opens the settings again and selects a postprocessor again. Using a global path allows the setting to keep working.

    # Note that this patch only fixes the issue for external postprocessors like postprocessd but the postprocessor script that comes with Megapixels is still refered to by the Nix store path.

    ./search-for-postprocessors-in-NixOS-specific-global-location.patch

  ];

  postInstall = ''

    glib-compile-schemas $out/share/glib-2.0/schemas

  '';

--- a/src/process_pipeline.c

+++ b/src/process_pipeline.c

@@ -179,10 +179,10 @@ mp_process_find_all_processors(GtkListStore *store)

                         store, &iter, 0, buffer, 1, "(built-in) postprocess.sh", -1);

         }

-        // Find extra packaged postprocessor scripts

-        // These should be packaged in

-        // /usr/share/megapixels/postprocessor.d/executable

-        sprintf(buffer, "%s/megapixels/postprocessor.d", DATADIR);

+        // Find extra system postprocessor scripts

+        // These should be accessible in

+        // /run/current-system/sw/share/megapixels/postprocessor.d/executable

+        sprintf(buffer, "/run/current-system/sw/share/megapixels/postprocessor.d");

         DIR *d;

         struct dirent *dir;

         d = opendir(buffer);

@@ -192,8 +192,7 @@ mp_process_find_all_processors(GtkListStore *store)

                                 continue;

                         }

                         sprintf(buffer,

-                                "%s/megapixels/postprocessor.d/%s",

-                                DATADIR,

+                                "/run/current-system/sw/share/megapixels/postprocessor.d/%s",

                                 dir->d_name);

                         gtk_list_store_insert(store, &iter, -1);

                         gtk_list_store_set(