fix wg conf logic

docker/wireguard.go

@@ -79,6 +79,7 @@ func buildWgConf() (string, error) {
 	return res, nil
 }
 
+// write latest conf
 func writeWgConf() error {
 	newConf, err := buildWgConf()
 	if err != nil {
@@ -97,15 +98,16 @@ func writeWgConf() error {
 	return nil
 }
 
+// either write directly or create volumes
 func writeWgConfToFile(filePath string, content string) error {
+	// try writing to path
 	err := ioutil.WriteFile(filePath, []byte(content), 0644)
 	if err != nil {
-		return fmt.Errorf("Failed to write new WG config: %v", err)
-	}
-	// Copy to volume
-	err = copyFileToVolume(filePath, "/etc/wireguard/", "wireguard")
-	if err != nil {
-		return fmt.Errorf("Failed to copy WG config file to volume: %v", err)
+		err = copyFileToVolume(filePath, "/etc/wireguard/", "wireguard")
+		// otherwise create the volume
+		if err != nil {
+			return fmt.Errorf("Failed to copy WG config file to volume: %v", err)
+		}
 	}
 	return nil
 }
@@ -145,4 +147,4 @@ func copyFileToVolume(filePath string, targetPath string, volumeName string) err
 		return err
 	}
 	return nil
-}
+}