GLib-GIO-ERROR **: Settings schema 'com.github.mfru.vala-todo' is not installed - glib

Question

First off, I am new to Vala, Gtk and Meson, so I might be looking in the totally wrong directions.
I'm running on Pop_OS! 20.10.
I want to compile a small example Vala application with support for GSettings.
However, when compiling with ninja, installing with sudo ninja install and then executing I get the error mentioned in the title.
It seems that even though my gschema file is copied into /usr/share/glib-2.0/schemas, running glib-compile-schemas in my post-install script is not doing anything.
I could also confirm that by running glib-compile-schemas manually and then checking with dconf Editor whether my settings are available which they aren't.
data/gschema.xml
<?xml version="1.0" encoding="UTF-8"?>
<schemalist>
<schema path="/com/github/mfru/vala-todo" id="com.github.mfru.vala-todo">
<key name="pos-x" type="i">
<default>360</default>
<summary>Horizontal position</summary>
<description>The saved horizontal position of our window</description>
</key>
<key name="pos-y" type="i">
<default>360</default>
<summary>Vertical position</summary>
<description>The saved vertical position of our window</description>
</key>
<key name="window-width" type="i">
<default>600</default>
<summary>Window width</summary>
<description>The saved width of our window</description>
</key>
<key name="window-height" type="i">
<default>400</default>
<summary>Window height</summary>
<description>The saved height of our window</description>
</key>
</schema>
</schemalist>
data/meson.build
install_data(
'gschema.xml',
install_dir: join_paths (get_option ('datadir'), 'glib-2.0', 'schemas'),
rename: meson.project_name () + '.geschema.xml'
)
meson/post-install.py
#!/usr/bin/env python3
import os
import subprocess
schemadir = os.path.join(os.environ['MESON_INSTALL_PREFIX'], 'share', 'glib-2.0', 'schemas')
print("Schemadir is", schemadir)
if 'DESTDIR' not in os.environ:
print("Compiling the gsettings schemas...")
subprocess.call(['glib-compile-schemas', schemadir])
I also reconfigured the meson prefix with meson build --prefix=/usr --reconfigure as at first the Prefix pointed to /usr/local but all existing schemas on my system are under /usr/share
Finally, what I expect to happen is that my example application starts without crashing because of missing GSettings.
Resources I looked into:
https://mesonbuild.com/Configuring-a-build-directory.html
https://developer.gnome.org/gio/stable/glib-compile-schemas.html
Is there any way to create GSettings schema during installation in Vala?

Answer 1

You have a typo in your build.meson file.
It should be .gschema.xml instead of .geschema.xml.