From e3de4030df037b42b4ae7a26aa03110882c1149e Mon Sep 17 00:00:00 2001
From: Thomas Ferreira de Lima <tlima@princeton.edu>
Date: Tue, 18 Dec 2018 18:38:51 -0500
Subject: [PATCH] http://mirrors.fedoraproject.org is unreliable. Retry yum 5
 times.

---
 ci-scripts/docker/docker_build.sh | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/ci-scripts/docker/docker_build.sh b/ci-scripts/docker/docker_build.sh
index fd3cff7a2..235335161 100755
--- a/ci-scripts/docker/docker_build.sh
+++ b/ci-scripts/docker/docker_build.sh
@@ -14,7 +14,12 @@ fi
 echo PY_VERSION=$PY_VERSION
 echo DOCKER_IMAGE=$DOCKER_IMAGE
 
-yum install -y zlib-devel ccache zip || exit 1  # sometimes the epel server is down.
+# sometimes the epel server is down. retry 5 times
+for i in $(seq 1 5); do 
+    yum install -y zlib-devel ccache zip && s=0 && break || s=$? && sleep 15; 
+done
+
+[ $s -eq 0 ] || exit $s
 
 if [[ $DOCKER_IMAGE == "quay.io/pypa/manylinux1_x86_64" ]]; then
     ln -s /usr/bin/ccache /usr/lib64/ccache/c++