From cdb494566d93f76f2722e5674d56b475b03993d2 Mon Sep 17 00:00:00 2001
From: Ralph Castain <rhc@open-mpi.org>
Date: Thu, 25 Feb 2016 11:33:26 -0600
Subject: [PATCH] Provide an option to allow isolated singletons

---
 orte/mca/ess/singleton/ess_singleton_module.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/orte/mca/ess/singleton/ess_singleton_module.c b/orte/mca/ess/singleton/ess_singleton_module.c
index 2e1e33840d..69717ae5da 100644
--- a/orte/mca/ess/singleton/ess_singleton_module.c
+++ b/orte/mca/ess/singleton/ess_singleton_module.c
@@ -158,7 +158,7 @@ static int rte_init(void)
     } else if (NULL != getenv("SINGULARITY_CONTAINER")) {
          /* mark that we are in a container */
         opal_setenv("OPAL_PROC_CONTAINER", "1", true, &environ);
-    } else {
+    } else if (NULL != getenv("OPAL_ISOLATED")) {
         /* spawn our very own HNP to support us */
         if (ORTE_SUCCESS != (rc = fork_hnp())) {
             ORTE_ERROR_LOG(rc);