From bf355c45274733368abc43e234563eb3141f1b68 Mon Sep 17 00:00:00 2001
From: tyhuber1 <68970760+tyhuber1@users.noreply.github.com>
Date: Thu, 30 Jul 2020 08:43:17 -0700
Subject: [PATCH] local: Add --local-no-set-modtime option to prevent modtime
 changes

If this option is enabled, rclone will not set modtime of uploaded files and
the backend will return ModTimeNotSupported as its Precision.

Normally rclone updates modification time of files after they are done
uploading. This can cause permissions issues on Linux platforms when
rclone is copying to a CIFS mount where the user rclone is
running as does not own the file uploaded. If this option is enabled,
rclone will no longer update the modtime after copying a file.

See: https://forum.rclone.org/t/chtimes-error-on-local-mounted-copy/17784
---
 backend/local/local.go | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/backend/local/local.go b/backend/local/local.go
index fcd788c17..85210ddbb 100644
--- a/backend/local/local.go
+++ b/backend/local/local.go
@@ -144,6 +144,17 @@ the OS zeros the file. However sparse files may be undesirable as they
 cause disk fragmentation and can be slow to work with.`,
 			Default:  false,
 			Advanced: true,
+		}, {
+			Name: "no_set_modtime",
+			Help: `Disable setting modtime
+
+Normally rclone updates modification time of files after they are done
+uploading. This can cause permissions issues on Linux platforms when 
+the user rclone is running as does not own the file uploaded, such as
+when copying to a CIFS mount owned by another user. If this option is 
+enabled, rclone will no longer update the modtime after copying a file.`,
+			Default:  false,
+			Advanced: true,
 		}, {
 			Name:     config.ConfigEncoding,
 			Help:     config.ConfigEncodingHelp,
@@ -166,6 +177,7 @@ type Options struct {
 	CaseSensitive     bool                 `config:"case_sensitive"`
 	CaseInsensitive   bool                 `config:"case_insensitive"`
 	NoSparse          bool                 `config:"no_sparse"`
+	NoSetModTime      bool                 `config:"no_set_modtime"`
 	Enc               encoder.MultiEncoder `config:"encoding"`
 }
 
@@ -542,6 +554,10 @@ func (f *Fs) Rmdir(ctx context.Context, dir string) error {
 
 // Precision of the file system
 func (f *Fs) Precision() (precision time.Duration) {
+	if f.opt.NoSetModTime {
+		return fs.ModTimeNotSupported
+	}
+
 	f.precisionOk.Do(func() {
 		f.precision = f.readPrecision()
 	})
@@ -878,6 +894,9 @@ func (o *Object) ModTime(ctx context.Context) time.Time {
 
 // SetModTime sets the modification time of the local fs object
 func (o *Object) SetModTime(ctx context.Context, modTime time.Time) error {
+	if o.fs.opt.NoSetModTime {
+		return nil
+	}
 	var err error
 	if o.translatedLink {
 		err = lChtimes(o.path, modTime, modTime)