some bug fixes

pkg/scan/timeout.go

@@ -0,0 +1,39 @@
+// Copyright (C) 2019 Marius Schellenberger
+
+package scan
+
+import (
+	"fmt"
+	"os/exec"
+	"time"
+)
+
+func timeout(cmd *exec.Cmd, t time.Duration) (output []byte, err error) {
+	done := make(chan error)
+	out := make(chan []byte)
+	go func() {
+		o, e := cmd.Output()
+		done <- e
+		out <- o
+	}()
+	select {
+	case <-time.After(t):
+		e := cmd.Process.Kill()
+		err = <-done
+		<-out
+		if e != nil {
+			err = e
+		} else {
+			err = fmt.Errorf("command '%s' timed out: %s", cmd.Path, err)
+		}
+	case e := <-done:
+		exerr, ok := e.(*exec.ExitError)
+		if ok {
+			err = fmt.Errorf("%s\n%s", e, string(exerr.Stderr))
+		} else {
+			err = e
+		}
+		output = <-out
+	}
+	return
+}