Implemented sane script validation. WTF did I think later..?

internal/radio/liquidsoap/liquidsoap.go

@@ -1,10 +1,8 @@
 package liquidsoap
 
 import (
-	"os"
 	"os/exec"
 	"syscall"
-	"time"
 
 	"github.com/pkg/errors"
 )
@@ -20,23 +18,21 @@ func NewLiquidsoap(liquidsoapPath, scriptPath string) (*Liquidsoap, error) {
 		return nil, err
 	}
 
+	out, err := exec.Command(liquidsoapPath, "--verbose", "-c", scriptPath).CombinedOutput()
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot check script")
+	}
+
+	if len(out) > 0 {
+		return nil, errors.Errorf("script validation failed: %s", string(out))
+	}
+
 	cmd := exec.Command(liquidsoapPath, scriptPath)
 
 	if err := cmd.Start(); err != nil {
 		return nil, err
 	}
 
-	// If there are errors in a script this time will be sufficient to wait
-	// for them to occure.
-	time.Sleep(4 * time.Second)
-
-	if _, err := os.FindProcess(cmd.Process.Pid); err != nil {
-		if err_wait := cmd.Wait(); err != nil {
-			return nil, errors.Wrap(err, err_wait.Error())
-		}
-		return nil, err
-	}
-
 	return &Liquidsoap{
 		command: cmd}, nil
 }