lock blockstore for pin add

License: MIT
Signed-off-by: Jeromy <jeromyj@gmail.com>

core/commands/pin.go

@@ -50,6 +50,9 @@ on disk.
 			return
 		}
 
+		unlock := n.Blockstore.RLock()
+		defer unlock()
+
 		// set recursive flag
 		recursive, found, err := req.Option("recursive").Bool()
 		if err != nil {