jw.pkg.cmds.distro.CmdRebootRequired: Add class

Add the command distro.CmdRebootRequired, adding support for "distro
reboot-required". The command exits with status code 1 if a reboot is
required and 0 otherwise.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/distro/backend/debian/RebootRequired.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+
+import os
+from argparse import Namespace
+
+from .....lib.log import *
+from ...Cmd import Cmd
+from ..BeRebootRequired import BeRebootRequired as Base
+
+class RebootRequired(Base):
+
+    def __init__(self, parent: Cmd):
+        super().__init__(parent)
+
+    async def run(self, args: Namespace):
+        reboot_required = '/run/reboot_required'
+        if os.path.exists(reboot_required):
+            if args.verbose:
+                log(NOTICE, f'Yes. {reboot_required} exists.')
+                required_pkgs = '/run/reboot-required.pkgs'
+                if os.path.exists(required_pkgs):
+                    with open(required_pkgs, 'r') as f:
+                        content = f.read()
+                        print(f'-- From {required_pkgs}:')
+                        print(content.strip())
+            return 1
+        if args.verbose:
+            log(NOTICE, f'No. {reboot_required} doesn\'t exist.')
+        return 0