From db6ef69e5b7676aaf277071858b347105292b715 Mon Sep 17 00:00:00 2001
From: James Bardin <j.bardin@gmail.com>
Date: Wed, 16 Aug 2017 15:19:17 -0400
Subject: [PATCH] fix race in MockResourceProvider

Input can be called concurrently from multiple nodes in the graph.
---
 terraform/resource_provider_mock.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/terraform/resource_provider_mock.go b/terraform/resource_provider_mock.go
index f5315339fb..95f8c56a22 100644
--- a/terraform/resource_provider_mock.go
+++ b/terraform/resource_provider_mock.go
@@ -94,6 +94,8 @@ func (p *MockResourceProvider) Close() error {
 
 func (p *MockResourceProvider) Input(
 	input UIInput, c *ResourceConfig) (*ResourceConfig, error) {
+	p.Lock()
+	defer p.Unlock()
 	p.InputCalled = true
 	p.InputInput = input
 	p.InputConfig = c