first working version

pkg/core/timeout.go

@@ -1,6 +1,7 @@
 package core
 
 import (
+	"errors"
 	"os/exec"
 	"time"
 )
@@ -24,7 +25,12 @@ func Timeout(cmd *exec.Cmd, t time.Duration) (output []byte, err error) {
 		}
 		err = <-done
 	case e := <-done:
-		err = e
+		exerr, ok := e.(*exec.ExitError)
+		if ok {
+			err = errors.New(e.Error() + "\n" + string(exerr.Stderr))
+		} else {
+			err = e
+		}
 		output = <-out
 	}
 	return