-docker=''
-if docker version > /dev/null 2>&1; then
- docker='docker'
-elif sudo docker version > /dev/null 2>&1; then
- docker='sudo docker'
-elif command -v docker > /dev/null 2>&1; then
- docker='docker'
+set +e
+docker=`which docker.io`
+if [[ "$docker" == "" ]]; then
+ docker=`which docker`
+fi
+set -e
+
+if $docker version > /dev/null 2>&1; then
+ docker="$docker"
+elif sudo $docker version > /dev/null 2>&1; then
+ docker="sudo $docker"
+elif command -v $docker > /dev/null 2>&1; then
+ docker="$docker"