maildir: log mail checking errors, if any

Add the logging of stdout/stderr of mail checking process in maildir
worker if it returns an error.

The user still sees just the exit status, but log gets a more detailed
information for further analysis.

Signed-off-by: Vitaly Ovchinnikov <v@postbox.nz>
Acked-by: Robin Jarry <robin@jarry.cc>
Reviewed-by: Tim Culverhouse <tim@timculverhouse.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/worker/maildir/worker.go b/worker/maildir/worker.go
index de882589..620e6c17 100644
--- a/worker/maildir/worker.go
+++ b/worker/maildir/worker.go
@@ -927,7 +927,14 @@ func (w *Worker) handleCheckMail(msg *types.CheckMail) {
 	ch := make(chan error)
 	go func() {
 		defer log.PanicHandler()
-		err := cmd.Run()
+
+		_, err := cmd.Output()
+		if err != nil {
+			var exitError *exec.ExitError
+			if errors.As(err, &exitError) {
+				err = fmt.Errorf("%w\n%s", err, string(exitError.Stderr))
+			}
+		}
 		ch <- err
 	}()
 	select {