Report a nicer error instead of traceback

When we try to open a non-existent file, report a nice error instead of
just a long traceback.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/patatt/__init__.py b/patatt/__init__.py
index a9e0ff6..58b5d33 100644
--- a/patatt/__init__.py
+++ b/patatt/__init__.py
@@ -915,7 +915,12 @@ def cmd_validate(cmdargs, config: dict):
     import mailbox
     if len(cmdargs.msgfile) == 1:
         # Try to open as an mbox file
-        mbox = mailbox.mbox(cmdargs.msgfile[0])
+        try:
+            mbox = mailbox.mbox(cmdargs.msgfile[0])
+        except IOError as ex:
+            logger.critical('E: %s', ex)
+            sys.exit(1)
+
         messages = dict()
         for msg in mbox:
             subject = msg.get('Subject', 'No subject')