From 7c41244e1504f7b20d76bf1248bd78519b1cc15c Mon Sep 17 00:00:00 2001
From: Megan Marsh <megan@hashicorp.com>
Date: Thu, 3 Oct 2019 14:50:53 -0700
Subject: [PATCH] use a unique temp dir for each build to prevent concurrent
 builds from stomping on each other

---
 builder/docker/step_temp_dir.go | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/builder/docker/step_temp_dir.go b/builder/docker/step_temp_dir.go
index c9578076e..72236dd96 100644
--- a/builder/docker/step_temp_dir.go
+++ b/builder/docker/step_temp_dir.go
@@ -3,6 +3,7 @@ package docker
 import (
 	"context"
 	"fmt"
+	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -34,16 +35,7 @@ func ConfigTmpDir() (string, error) {
 		configdir = fp
 	}
 
-	td := filepath.Join(configdir, "tmp")
-	_, err = os.Stat(td)
-	if os.IsNotExist(err) {
-		log.Printf("Creating tempdir in %s", td)
-		if err = os.MkdirAll(td, 0755); err != nil {
-			return "", err
-		}
-	} else if err != nil {
-		return "", err
-	}
+	td, err := ioutil.TempDir(configdir, "tmp")
 	log.Printf("Set Packer temp dir to %s", td)
 	return td, nil
 }