File support-use-of-gce-instance-credentials-109.patch of Package salt.9310

From 11dec96e5f84df4678ca51bcaecbd42092f892c2 Mon Sep 17 00:00:00 2001
From: jgleissner <jgleissner@suse.com>
Date: Wed, 19 Sep 2018 14:37:12 +0200
Subject: [PATCH] Support use of GCE instance credentials (#109)

* Integration of MSI authentication with azurearm cloud driver (#105)

* allow empty service_account_private_key in GCE driver

Passing an emoty service_account_private_key to libcloud will enable
authentication using instance credentials, which is used by CaaSP in GCE.
---
 salt/cloud/clouds/gce.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/salt/cloud/clouds/gce.py b/salt/cloud/clouds/gce.py
index 75109491be..1018e36ed5 100644
--- a/salt/cloud/clouds/gce.py
+++ b/salt/cloud/clouds/gce.py
@@ -134,7 +134,8 @@ def __virtual__():
 
         parameters = details['gce']
         pathname = os.path.expanduser(parameters['service_account_private_key'])
-        if salt.utils.cloud.check_key_path_and_mode(
+        # empty pathname will tell libcloud to use instance credentials
+        if pathname and salt.utils.cloud.check_key_path_and_mode(
                 provider, pathname
         ) is False:
             return False
-- 
2.17.1