add test-smtp command

src/pacroller/config.py

@@ -24,7 +24,12 @@ else:
     _config = dict()
 
 if (smtp_cfg := (CONFIG_DIR / CONFIG_FILE_SMTP)).exists():
-    _smtp_config: dict = json.loads(smtp_cfg.read_text())
+    try:
+        _smtp_cfg_text = smtp_cfg.read_text()
+    except PermissionError:
+        _smtp_config = dict()
+    else:
+        _smtp_config: dict = json.loads(_smtp_cfg_text)
 else:
     _smtp_config = dict()
 

src/pacroller/mailer.py

@@ -17,9 +17,9 @@ class MailSender:
         self.mailfrom = SMTP_FROM
         self.mailto = SMTP_TO.split()
         self.smtp_cls = smtplib.SMTP_SSL if self.ssl else smtplib.SMTP
-    def send_text_plain(self, text: str, subject: str = f"pacroller from {hostname}", mailto: List[str] = list()) -> None:
+    def send_text_plain(self, text: str, subject: str = f"pacroller on {hostname}", mailto: List[str] = list()) -> bool:
         if not SMTP_ENABLED:
-            return
+            return None
         for _ in range(NETWORK_RETRY):
             try:
                 server = self.smtp_cls(self.host, self.port)
@@ -40,6 +40,8 @@ class MailSender:
                 break
         else:
             logger.error(f"unable to send email after {NETWORK_RETRY} attempts {text=}")
+            return False
+        return True
 
 if __name__ == "__main__":
     logging.basicConfig(level=logging.DEBUG, format='%(asctime)s - %(module)s - %(funcName)s - %(levelname)s - %(message)s')

src/pacroller/main.py

@@ -264,8 +264,8 @@ def main() -> None:
             logger.debug(f'needrestart {p.stdout=}')
     import argparse
     parser = argparse.ArgumentParser(description='Unattended Upgrades for Arch Linux')
-    parser.add_argument('action', choices=['run', 'status', 'reset', 'fail-reset', 'reset-failed'],
-                        help="what to do", metavar="run / status / reset ")
+    parser.add_argument('action', choices=['run', 'status', 'reset', 'fail-reset', 'reset-failed', 'test-smtp'],
+                        help="what to do", metavar="run / status / reset / test-smtp")
     parser.add_argument('-d', '--debug', action='store_true', help='enable debug mode')
     parser.add_argument('-v', '--verbose', action='store_true', help='show verbose report')
     parser.add_argument('-m', '--max', type=int, default=1, help='Number of upgrades to show')
@@ -321,6 +321,15 @@ def main() -> None:
             if PACMAN_SCC:
                 clear_pkg_cache()
 
+    elif args.action == 'test-smtp':
+        logger.info('sending test mail...')
+        if _smtp_result := MailSender().send_text_plain("This is a test mail\nIf you see this email, your smtp config is working."):
+            logger.info("success")
+        elif _smtp_result is None:
+            logger.warning("smtp is disabled")
+        else:
+            logger.error("fail")
+
     elif args.action == 'status':
         count = 0
         failed = False