Locally-built Flatpak AppData does not show in PureOS Store

Software PureOS
1

I’m creating a Flatpak app for the Librem 5. I might want to distribute it to Flathub. In order to show a summary, Git repo and other information, I’ve added an AppData XML file to my build that looks something like this:

com.example.gnome.App.metainfo.xml

<?xml version="1.0" encoding="UTF-8"?>
<component type="desktop-application">
<id>com.example.gnome.App</id>

  <name>My App</name>
  <summary>A summary</summary>
  <description>
    <p>A description</p>
  </description>

  <metadata_license>CC0-1.0</metadata_license>
  <project_license>GPL-3.0-or-later</project_license>

  <url type="vcs-browser">https://example.com/vcs/my-app.git</url>
  <launchable type="desktop-id">com.example.gnome.App.desktop</launchable>
  <content_rating type="oars-1.1" />
  <!-- ... etcetera ... -->

meson.build

metainfo_file = i18n.merge_file(
        input: 'com.example.gnome.App.metainfo.xml.in',
       output: 'com.example.gnome.App.metainfo.xml',
       po_dir: '../po',
      install: true,
  install_dir: join_paths(get_option('datadir'), 'metainfo')
)

appstream_util = find_program('appstream-util', required: true)
if appstream_util.found()
  test('Validate appstream file',
        appstream_util,
        args: ['validate', metainfo_file],
        verbose: true)
endif

I tried both appdata.xml and metainfo.xml (the latter is now recommended, apparently).

It validates when I run appstream-util validate against it. Then, when I use Gnome Builder (version 43.5) and create a .flatpak, I double click to open it in PureOS store. However, none of the metadata, including name and summary, shows. In fact, everything looks pretty empty. It says it’s a proprietary app, no screenshots are available, no age rating, etc.

What am I doing wrong? Is the AppData not in the generated .flatpak? I would like to be able to test this locally before pushing to Flathub.

2

Wild guess, but perhaps the store is querying flathub for your app’s information and not seeing any?

3

Good one, but after some experimentation, I don’t think so. When I run tcpdump in the background, I don’t see any traffic while opening the .flatpak.

When I inspect the contents of the .flatpak with xxd, I also don’t see the contents of the AppData anywhere. Of course, that might not mean anything, it might be converted to some non-human-readable binary format. (I thought I just mention it, because I do see other human-readable strings in the .flatpak.)