Ensure data dir is present

internal/torrent/util.go

@@ -2,6 +2,7 @@ package torrent
 
 import (
 	"fmt"
+	"os"
 	"strings"
 )
 
@@ -22,3 +23,15 @@ func isStreamable(filePath string) bool {
 		strings.HasSuffix(filePath, ".wmv") ||
 		strings.HasSuffix(filePath, ".m4v")
 }
+
+func ensureDir(dirName string) error {
+	if _, err := os.Stat(dirName); os.IsNotExist(err) {
+		err := os.Mkdir(dirName, 0755)
+		if err != nil {
+			return err
+		}
+	} else if err != nil {
+		return err
+	}
+	return nil
+}