+graph_driver=$6
+
+if [[ "$image_repo" = "<none>" ]] ; then
+ image_repo=none
+ image_tag=latest
+fi
+
+# Print free space in /var/lib/docker
+function freespace() {
+ df -B1 /var/lib/docker | tail -n1 | sed 's/ */ /g' | cut -d' ' -f4
+}
+
+# Run docker-in-docker script and then wait for it to come up
+function start_docker {
+ /root/dnd.sh $graph_driver &
+ for i in $(seq 1 10) ; do
+ if docker version >/dev/null 2>/dev/null ; then
+ return
+ fi
+ sleep 1
+ done
+ false
+}
+
+# Kill docker from pid then wait for it to be down
+function kill_docker {
+ if test -f /var/run/docker.pid ; then
+ kill $(cat /var/run/docker.pid)
+ fi
+ for i in $(seq 1 10) ; do
+ if ! docker version >/dev/null 2>/dev/null ; then
+ return
+ fi
+ sleep 1
+ done
+ false
+}
+
+# Ensure that we clean up docker graph and/or lingering cache files on exit
+function cleanup {
+ kill_docker
+ rm -rf /var/lib/docker/*
+ rm -rf /root/.cache/arvados/docker/*
+ echo "Available space after cleanup is $(freespace)"
+}
+
+trap cleanup EXIT
+
+start_docker
+
+echo "Initial available space is $(freespace)"