From 9662554f53fc68fdbbf0eabed8c7733effdb35b4 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 ffdb874c3..4c3048f8b 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)