Update docker files from latest Rafael's changes

docker/scripts/lib/base_functions.sh

@@ -0,0 +1,66 @@
+is_set() {
+    local var=$1
+
+    [[ -n $var ]]
+}
+
+
+is_zero() {
+    local var=$1
+
+    [[ -z $var ]]
+}
+
+
+file_exist() {
+    local file=$1
+
+    [[ -e $file ]]
+}
+
+
+is_true() {
+    local var=${1,,}
+    local choices=("yes" "1" "y" "true")
+    for ((i=0;i < ${#choices[@]};i++)) {
+        [[ "${choices[i]}" == $var ]] && return 0
+    }
+    return 1
+}
+
+
+# overwrite this function to get hostname from other sources
+# like dns or etcd
+get_nodename() {
+    echo ${HOSTNAME}
+}
+
+
+join_cluster() {
+    local cluster_node=$1
+
+    is_zero ${cluster_node} \
+        && exit 0
+
+    echo "Join cluster..."
+
+    local erlang_node_name=${ERLANG_NODE%@*}
+    local erlang_cluster_node="${erlang_node_name}@${cluster_node}"
+
+    response=$(${EJABBERDCTL} ping ${erlang_cluster_node})
+    while [ "$response" != "pong" ]; do
+        echo "Waiting for ${erlang_cluster_node}..."
+        sleep 2
+        response=$(${EJABBERDCTL} ping ${erlang_cluster_node})
+    done
+
+    echo "Join cluster at ${erlang_cluster_node}... "
+    NO_WARNINGS=true ${EJABBERDCTL} join_cluster $erlang_cluster_node
+
+    if [ $? -eq 0 ]; then
+        touch ${CLUSTER_NODE_FILE}
+    else
+        echo "cloud not join cluster"
+        exit 1
+    fi
+}