allow pulling a docker image from dockerhub instead of building locally
diff --git a/tools/run_tests/dockerize/build_and_run_docker.sh b/tools/run_tests/dockerize/build_and_run_docker.sh
index 1ef34b2..f52f16e 100755
--- a/tools/run_tests/dockerize/build_and_run_docker.sh
+++ b/tools/run_tests/dockerize/build_and_run_docker.sh
@@ -41,13 +41,20 @@
# DOCKERFILE_DIR - Directory in which Dockerfile file is located.
# DOCKER_RUN_SCRIPT - Script to run under docker (relative to grpc repo root)
# OUTPUT_DIR - Directory that will be copied from inside docker after finishing.
+# DOCKERHUB_ORGANIZATION - If set, pull a prebuilt image from given dockerhub org.
# $@ - Extra args to pass to docker run
# Use image name based on Dockerfile location checksum
DOCKER_IMAGE_NAME=$(basename $DOCKERFILE_DIR)_$(sha1sum $DOCKERFILE_DIR/Dockerfile | cut -f1 -d\ )
-# Make sure docker image has been built. Should be instantaneous if so.
-docker build -t $DOCKER_IMAGE_NAME $DOCKERFILE_DIR
+if [ "$DOCKERHUB_ORGANIZATION" != "" ]
+then
+ DOCKER_IMAGE_NAME=$DOCKERHUB_ORGANIZATION/$DOCKER_IMAGE_NAME
+ docker pull $DOCKER_IMAGE_NAME
+else
+ # Make sure docker image has been built. Should be instantaneous if so.
+ docker build -t $DOCKER_IMAGE_NAME $DOCKERFILE_DIR
+fi
# Choose random name for docker container
CONTAINER_NAME="build_and_run_docker_$(uuidgen)"