Set IPv4 subnet only if specified or error on regular network new net…

… creation.

docker/docker-network-create.sh

@@ -26,7 +26,8 @@
 # You must/might inform the parameters below:
 # 1. Network name which should be created
 # 2. [optional] (default: ) Subnet for the IPV4
-#   - This option is required if you are activating IPv6
+#   - You can set 'false' or send an empty string to this option if
+#   only wants to activate IPv6
 # 3. [optional] (default: false) Set 'true' if IPv6 should be enabled
 # 4. [optional] (default: ) Subnet for the IPV6
 # in the network options
@@ -38,9 +39,10 @@ docker_network_create()
     local LOCAL_NETWORK_NAME LOCAL_ENABLE_IPv4 LOCAL_ENABLE_IPv6 LOCAL_RESULT
 
     LOCAL_NETWORK_NAME=${1:-null}
-    LOCAL_IPv4_SUBNET=${2:-"172.17.0.0/16"}
+    LOCAL_IPv4_SUBNET=${2:-null}
     LOCAL_ENABLE_IPv6=${3:-false}
     LOCAL_IPv6_SUBNET=${4:-"2001:db8:1:1::/112"}
+    LOCAL_IPv4_DEFAULT="172.172.0.0/16" # This will be used in case of error when creating a docker network
 
     [[ $LOCAL_NETWORK_NAME == "" || $LOCAL_NETWORK_NAME == null ]] && echoerror "You must inform the network name to the function: '${FUNCNAME[0]}'"
 
@@ -50,12 +52,21 @@ docker_network_create()
 
     # Create docker network
     if [[ "$LOCAL_ENABLE_IPv6" == true ]]; then
-        if ! docker network create $LOCAL_NETWORK_NAME --ipv6 --subnet=$LOCAL_IPv6_SUBNET --subnet=$LOCAL_IPv4_SUBNET; then
-            ERROR_DOCKER_NETWORK_CREATE=true
+        if [[ $LOCAL_IPv4_SUBNET == "" || $LOCAL_IPv4_SUBNET == null || $LOCAL_IPv4_SUBNET == false ]]; then
+            docker network create $LOCAL_NETWORK_NAME --ipv6 --subnet=$LOCAL_IPv6_SUBNET && return
+            docker network create $LOCAL_NETWORK_NAME --ipv6 --subnet=$LOCAL_IPv6_SUBNET --subnet=$LOCAL_IPv4_DEFAULT && return
+        else
+            docker network create $LOCAL_NETWORK_NAME --ipv6 --subnet=$LOCAL_IPv6_SUBNET --subnet=$LOCAL_IPv4_SUBNET && return
         fi
     else
-        if ! docker network create $LOCAL_NETWORK_NAME --subnet=$LOCAL_IPv4_SUBNET; then
-            ERROR_DOCKER_NETWORK_CREATE=true
+        if [[ $LOCAL_IPv4_SUBNET == "" || $LOCAL_IPv4_SUBNET == null || $LOCAL_IPv4_SUBNET == false ]]; then
+            docker network create $LOCAL_NETWORK_NAME && return
+            docker network create $LOCAL_NETWORK_NAME --subnet=$LOCAL_IPv4_DEFAULT && return
+        else
+            docker network create $LOCAL_NETWORK_NAME --subnet=$LOCAL_IPv4_SUBNET && return
         fi
     fi
+
+    ERROR_DOCKER_NETWORK_CREATE=true
+    return
 }