build: Use meson's gnome.post_install()

... instead of the external script.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2077>

meson.build

@@ -295,7 +295,11 @@ if get_option('gtk_doc')
   subdir('docs/reference')
 endif
 
-meson.add_install_script('meson/postinstall.py')
+gnome.post_install(
+  glib_compile_schemas: true,
+  gtk_update_icon_cache: true
+)
+
 meson.add_dist_script('meson/generate-manpages.py')
 meson.add_dist_script('meson/generate-stylesheets.py')
 meson.add_dist_script('meson/check-version.py', meson.project_version(), 'NEWS')

meson/postinstall.py

@@ -1,27 +0,0 @@
-#!/usr/bin/env python3
-
-import os
-import subprocess
-
-prefix = os.environ.get('MESON_INSTALL_PREFIX', '/usr/local')
-datadir = os.path.join(prefix, 'share')
-
-# Packaging tools define DESTDIR and this isn't needed for them
-if 'DESTDIR' not in os.environ:
-    print('Updating icon cache...')
-    icon_cache_dir = os.path.join(datadir, 'icons', 'hicolor')
-    if not os.path.exists(icon_cache_dir):
-        os.makedirs(icon_cache_dir)
-    subprocess.call(['gtk-update-icon-cache', '-qtf', icon_cache_dir])
-
-    print('Updating desktop database...')
-    desktop_database_dir = os.path.join(datadir, 'applications')
-    if not os.path.exists(desktop_database_dir):
-        os.makedirs(desktop_database_dir)
-    subprocess.call(['update-desktop-database', '-q', desktop_database_dir])
-
-    print('Compiling GSettings schemas...')
-    schemas_dir = os.path.join(datadir, 'glib-2.0', 'schemas')
-    if not os.path.exists(schemas_dir):
-        os.makedirs(schemas_dir)
-    subprocess.call(['glib-compile-schemas', schemas_dir])

subprojects/extensions-app/build-aux/meson/postinstall.py

@@ -1 +0,0 @@
-../../../../meson/postinstall.py

subprojects/extensions-app/meson.build

@@ -60,7 +60,9 @@ if not meson.is_subproject()
 
   subdir('po')
 
-  meson.add_install_script('build-aux/meson/postinstall.py')
+  gnome.post_install(
+    gtk_update_icon_cache: true
+  )
 
   if appstream_util.found()
     meson.add_dist_script('build-aux/meson/check-version.py',