From 1e423d21e18d7c39e1bf8a2e7a762dda4c8edc4a Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Fri, 8 Nov 2019 10:29:45 +0000
Subject: [PATCH] drive: fix listing of the root directory with drive.files
 scope

We attempt to find the ID of the root folder by doing a GET on the
folder ID "root". With scope "drive.files" this fails with a 404
message.

After this change if we get the 404 message, we just carry on using
"root" as the root folder ID and we cache that for future lookups.

This means that changenotify messages will not work correctly in the
root folder but otherwise has minor consequences.

See: https://forum.rclone.org/t/fresh-raspberry-pi-build-google-drive-404-error-failed-to-ls-googleapi-error-404-file-not-found/12791
---
 backend/drive/drive.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/backend/drive/drive.go b/backend/drive/drive.go
index 5e55ba3a3..cc8185395 100644
--- a/backend/drive/drive.go
+++ b/backend/drive/drive.go
@@ -1030,7 +1030,13 @@ func NewFs(name, path string, m configmap.Mapper) (fs.Fs, error) {
 		// Look up the root ID and cache it in the config
 		rootID, err := f.getRootID()
 		if err != nil {
-			return nil, err
+			if gerr, ok := errors.Cause(err).(*googleapi.Error); ok && gerr.Code == 404 {
+				// 404 means that this scope does not have permission to get the
+				// root so just use "root"
+				rootID = "root"
+			} else {
+				return nil, err
+			}
 		}
 		f.rootFolderID = rootID
 		m.Set("root_folder_id", rootID)