From f66928a846198778b52c75b45737de4d33d6cc54 Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Mon, 1 Feb 2021 15:17:25 +0000
Subject: [PATCH] drive: fix copyid command with a bare filename: can't use
 empty string as a path

Before this change, running

    rclone backend copyid drive: ID file.txt

Failed with the error

    command "copyid" failed: failed copying "ID" "file.txt": can't use empty string as a path

This fixes the problem.
---
 backend/drive/drive.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backend/drive/drive.go b/backend/drive/drive.go
index eab0c3bba..43e43a986 100755
--- a/backend/drive/drive.go
+++ b/backend/drive/drive.go
@@ -3064,6 +3064,9 @@ func (f *Fs) copyID(ctx context.Context, id, dest string) (err error) {
 	if destLeaf == "" {
 		destLeaf = info.Name
 	}
+	if destDir == "" {
+		destDir = "."
+	}
 	dstFs, err := cache.Get(ctx, destDir)
 	if err != nil {
 		return err