Add flatpak update plugin for system-wide flatpaks

improves: QubesOS/qubes-issues#2766
requires: QubesOS/qubes-core-agent-linux#604

Author: alimirjamali

vmupdate/agent/source/plugins/flatpak_updater.py

@@ -0,0 +1,54 @@
+# coding=utf-8
+#
+# The Qubes OS Project, http://www.qubes-os.org
+#
+# Copyright (C) 2025  Ali Mirjamali <[email protected]>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+# USA.
+
+import subprocess
+
+from pathlib import Path
+
+def flatpak_updater(os_data, log, **kwargs):
+    """
+    Distro agnostic plugin to update system-wide flatpaks
+    """
+
+    if not Path("/usr/bin/flatpak"):
+        return
+
+    log.info("Flatpak is installed. Checking for flatpak updates.")
+    proc = subprocess.Popen(
+        ["flatpak", "remotes", "--columns", "name"],
+        stdout=subprocess.PIPE
+    )
+    flatpak_updates_available = False
+    for remote in proc.stdout.read().decode().strip().split("\n"):
+        if subprocess.Popen(
+            ["flatpak", "remote-ls", remote, "--system", "--updates"],
+            stdout=subprocess.PIPE
+        ).stdout.read().decode().strip():
+            flatpak_updates_available = True
+            break
+    if not flatpak_updates_available:
+        log.info("No flatpak updates found.")
+        return
+
+    log.info("Flatpak updates found. Updating flatpaks...")
+    subprocess.run(
+        ["flatpak", "update", "--noninteractive", "-y"]
+    )