Allow the sync command to pass --preserve-timestamp to cp

command/sync.go

@@ -114,8 +114,9 @@ type Sync struct {
 	fullCommand string
 
 	// flags
-	delete   bool
-	sizeOnly bool
+	delete            bool
+	sizeOnly          bool
+	preserveTimestamp bool
 
 	// s3 options
 	storageOpts storage.Options
@@ -137,8 +138,9 @@ func NewSync(c *cli.Context) Sync {
 		fullCommand: commandFromContext(c),
 
 		// flags
-		delete:   c.Bool("delete"),
-		sizeOnly: c.Bool("size-only"),
+		delete:            c.Bool("delete"),
+		sizeOnly:          c.Bool("size-only"),
+		preserveTimestamp: c.Bool("preserve-timestamp"),
 
 		// flags
 		followSymlinks: !c.Bool("no-follow-symlinks"),
@@ -358,6 +360,9 @@ func (s Sync) planRun(
 	defaultFlags := map[string]interface{}{
 		"raw": true,
 	}
+	if s.preserveTimestamp {
+		defaultFlags["preserve-timestamp"] = s.preserveTimestamp
+	}
 
 	// only in source
 	for _, srcurl := range onlySource {