From 57f1bb7bb25bd8541f467ed9507157d90f6ac02b Mon Sep 17 00:00:00 2001
From: Jon Fautley <jon@dead.li>
Date: Thu, 4 Jan 2018 14:52:47 +0000
Subject: [PATCH] sftp: add 'set_modtime' hidden configuration option

---
 docs/content/sftp.md |  5 +++++
 sftp/sftp.go         | 12 +++++++-----
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/docs/content/sftp.md b/docs/content/sftp.md
index 3c984744c..6dab5afb5 100644
--- a/docs/content/sftp.md
+++ b/docs/content/sftp.md
@@ -147,6 +147,11 @@ Modified times are stored on the server to 1 second precision.
 
 Modified times are used in syncing and are fully supported.
 
+Some SFTP servers disable setting/modifying the file modification time after
+upload (for example, certain configurations of ProFTPd with mod_sftp). If you
+are using one of these servers, you can set the option `set_modtime = false` in
+your RClone backend configuration to disable this behaviour.
+
 ### Limitations ###
 
 SFTP supports checksums if the same login has shell access and `md5sum`
diff --git a/sftp/sftp.go b/sftp/sftp.go
index 7d287c880..dffc35a91 100644
--- a/sftp/sftp.go
+++ b/sftp/sftp.go
@@ -812,14 +812,16 @@ func (o *Object) SetModTime(modTime time.Time) error {
 	if err != nil {
 		return errors.Wrap(err, "SetModTime")
 	}
-	err = c.sftpClient.Chtimes(o.path(), modTime, modTime)
-	o.fs.putSftpConnection(&c, err)
-	if err != nil {
-		return errors.Wrap(err, "SetModTime failed")
+	if fs.ConfigFileGetBool(o.fs.name, "set_modtime", true) {
+		err = c.sftpClient.Chtimes(o.path(), modTime, modTime)
+		o.fs.putSftpConnection(&c, err)
+		if err != nil {
+			return errors.Wrap(err, "SetModTime failed")
+		}
 	}
 	err = o.stat()
 	if err != nil {
-		return errors.Wrap(err, "SetModTime failed")
+		return errors.Wrap(err, "SetModTime stat failed")
 	}
 	return nil
 }