Embed a settings.gschema.xml with compile_resources and gio::resources_register_include!

Platform Language bindings
1

My question is whether this is possible. Create a settings.gschema.xml:

<?xml version="1.0" encoding="utf-8"?>
<schemalist>
  <schema id="org.domain.myapp" path="/org/domain/myapp/">
    <key name="is-switch-enabled" type="b">
      <default>false</default>
      <summary>Default switch state</summary>
    </key>
  </schema>
</schemalist>

Which is then put into a resource file such as this:

<?xml version="1.0" encoding="UTF-8"?>
<gresources>
  <gresource prefix="/org/domain/myapp/">
    <file>settings.gschema.xml</file>
  </gresource>
</gresources>

Then include it with compile_resources, load it with gio::resources_register_include!("my.gresource").expect("Failed to register resources."); and finally access it in some way similar to let settings = gio::Settings::new("org.domain.myapp");.

I have tried several different ways and all of them fail with: Settings schema ‘org.domain.myapp’ is not installed :cry:

2

I don’t think this would work out of the box; no such behaviour is documented for GSettings.

If you wish to load an embedded schema, you’d likely need to embed the compiled settings as a resource, copy it from resources to a temporary directory on startup, create a schema source for that directory (see SettingsSchemaSource.new_from_directory, and then create your GSettings object with your schema explicitly looked up from that source.

That’d be rather… unusual behaviour for a Gtk application, tho. Why do you wish to include the settings schema as a resource?

3

It would be to make the application more portable and not have to be installing things here and there. Especially for Windows which is a bit hellish.

In any case, I think it would be interesting if it were supported in the same way that composite templates or CSS are supported.

4

It is not: allow creating schema source from resource (#499) · Issues · GNOME / GLib · GitLab

It does not matter if you do it for your own settings: GTK and other libraries have their own settings as well, which means they would need to switch to embedded schemas first.

5

Wow, I’ve hit the 13 year “bug”!

Well, mystery solved. It is true that it would be interesting if it could be done, but I understand the difficulties of why it is not done.

6

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