From a9e7e7bcc26272b6ad17cc9fff3e652869203ccf Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Tue, 28 Mar 2023 07:26:28 +0100
Subject: [PATCH] ftp: Fix "501 Not a valid pathname." errors when creating
 directories

Some servers return a 501 error when using MLST on a non-existing
directory. This patch allows it.

I don't think this is correct usage according to the RFC, but the RFC
doesn't explicitly state which error code should be returned for
file/directory not found.
---
 backend/ftp/ftp.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/backend/ftp/ftp.go b/backend/ftp/ftp.go
index 0419971fa..cedd07861 100644
--- a/backend/ftp/ftp.go
+++ b/backend/ftp/ftp.go
@@ -693,6 +693,12 @@ func (f *Fs) findItem(ctx context.Context, remote string) (entry *ftp.Entry, err
 			if err == fs.ErrorObjectNotFound {
 				return nil, nil
 			}
+			if errX := textprotoError(err); errX != nil {
+				switch errX.Code {
+				case ftp.StatusBadArguments:
+					err = nil
+				}
+			}
 			return nil, err
 		}
 		if entry != nil {