Use Region not S3Endpoint

builder/amazon/instance/builder.go

@@ -75,7 +75,7 @@ func (b *Builder) Prepare(raws ...interface{}) ([]string, error) {
 			"-s {{.SecretKey}} " +
 			"-d {{.BundleDirectory}} " +
 			"--batch " +
-			"--url {{.S3Endpoint}} " +
+			"--region {{.Region}} " +
 			"--retry"
 	}
 

builder/amazon/instance/step_upload_bundle.go

@@ -11,7 +11,7 @@ type uploadCmdData struct {
 	BucketName      string
 	BundleDirectory string
 	ManifestPath    string
-	S3Endpoint      string
+	Region          string
 	SecretKey       string
 }
 
@@ -37,7 +37,7 @@ func (s *StepUploadBundle) Run(state multistep.StateBag) multistep.StepAction {
 		BucketName:      config.S3Bucket,
 		BundleDirectory: config.BundleDestination,
 		ManifestPath:    manifestPath,
-		S3Endpoint:      region.S3Endpoint,
+		Region:          region.Name,
 		SecretKey:       config.SecretKey,
 	})
 	if err != nil {