From f565dfb46ada281acb7faffaa407d2904684cf57 Mon Sep 17 00:00:00 2001
From: Stanley Cheung <stanleycheung@google.com>
Date: Thu, 15 Oct 2015 17:57:09 -0700
Subject: [PATCH] add check to see if file exists

---
 tools/run_tests/run_interop_tests.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/run_tests/run_interop_tests.py b/tools/run_tests/run_interop_tests.py
index fe8050d1bc..cecb73de71 100755
--- a/tools/run_tests/run_interop_tests.py
+++ b/tools/run_tests/run_interop_tests.py
@@ -481,7 +481,7 @@ def build_interop_image_jobspec(language, tag=None):
   # This env variable is used to get around the github rate limit
   # error when running the PHP `composer install` command
   # TODO(stanleycheung): find a more elegant way to do this
-  if language.safename == 'php':
+  if language.safename == 'php' and os.path.exists('/var/local/.composer/auth.json'):
     env['BUILD_INTEROP_DOCKER_EXTRA_ARGS'] = \
       "-v /var/local/.composer/auth.json:/root/.composer/auth.json:ro"
   build_job = jobset.JobSpec(
-- 
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