create: Allow specifying a custom config file to override default

usr/local/share/bastille/create.sh

@@ -43,6 +43,7 @@ usage() {
     
     -B | --bridge                          Enables VNET, VNET containers are attached to a specified, already existing external bridge.
     -C | --clone                           Creates a clone container, they are duplicates of the base release, consume low space and preserves changing data.
+    -c | --config                          Use a customized configuration file to override the default values.
     -D | --dual                            Creates the jails with both IPv4 and IPv6 networking ('inherit' and 'ip_hostname' only).
     -E | --empty                           Creates an empty container, intended for custom jail builds (thin/thick/linux or unsupported).
     -L | --linux                           This option is intended for testing with Linux jails, this is considered experimental.
@@ -667,6 +668,7 @@ LINUX_JAIL=""
 STATIC_MAC=""
 DUAL_STACK=""
 VALIDATE_RELEASE="1"
+OPT_CONFIG=""
 while [ $# -gt 0 ]; do
     case "${1}" in
         -h|--help|help)
@@ -681,6 +683,22 @@ while [ $# -gt 0 ]; do
             CLONE_JAIL="1"
             shift
             ;;
+        -c|--config)
+            OPT_CONFIG="${2}"
+	    if [ ! -f "${OPT_CONFIG}" ]; then
+                if [ ! -f /usr/local/etc/bastille/${OPT_CONFIG} ]; then
+                    error_notify "Not a valid config file: ${OPT_CONFIG}"
+		    usage
+                else
+                    info "Using custom config: ${OPT_CONFIG}"
+		    . /usr/local/etc/bastille/${OPT_CONFIG}
+                fi
+	    else
+                info "Using custom config: ${OPT_CONFIG}"
+                . "${OPT_CONFIG}"
+	    fi
+            shift 2
+            ;;
         -D|--dual)
             DUAL_STACK="1"
             shift