From 34b750977bebc6e8d2d9e92890e0f12bde58b1ce Mon Sep 17 00:00:00 2001
From: Damon Kohler <damonkohler@google.com>
Date: Fri, 19 May 2017 08:29:09 +0200
Subject: [PATCH] Do not ignore docker history command errors. (#298)

---
 scripts/save_docker_cache.sh | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/scripts/save_docker_cache.sh b/scripts/save_docker_cache.sh
index a9a3a4b..7b2000e 100755
--- a/scripts/save_docker_cache.sh
+++ b/scripts/save_docker_cache.sh
@@ -23,7 +23,8 @@ set -o pipefail
 
 if [[ ${TRAVIS_BRANCH} == "master" ]] &&
     [[ ${TRAVIS_PULL_REQUEST} == "false" ]]; then
-  mkdir -p $(dirname ${DOCKER_CACHE_FILE});
-  docker save $(docker history -q cartographer:${LSB_RELEASE} |
-      grep -v '<missing>') | gzip > ${DOCKER_CACHE_FILE};
+  mkdir -p $(dirname ${DOCKER_CACHE_FILE})
+  IMAGE_NAMES=$(docker history -q cartographer:${LSB_RELEASE} | grep -v '<missing>')
+  docker save ${IMAGE_NAMES} | gzip > ${DOCKER_CACHE_FILE}.new
+  mv ${DOCKER_CACHE_FILE}.new ${DOCKER_CACHE_FILE}
 fi