Validate jib during jail import

usr/local/share/bastille/import.sh

@@ -152,6 +152,11 @@ update_jailconf() {
             sed -i '' "s|path.*=.*;|path = ${bastille_jailsdir}/${TARGET_TRIM}/root;|" "${JAIL_CONFIG}"
             sed -i '' "s|mount.fstab.*=.*;|mount.fstab = ${bastille_jailsdir}/${TARGET_TRIM}/fstab;|" "${JAIL_CONFIG}"
         fi
+
+        # Check for the jib script
+        if grep -qw "vnet" "${JAIL_CONFIG}"; then
+            vnet_requirements
+        fi
     fi
 }
 
@@ -209,6 +214,7 @@ generate_config() {
     # See if we need to generate a vnet network section
     if [ "${IS_VNET_JAIL:-0}" = "1" ]; then
         NETBLOCK=$(generate_vnet_jail_netblock "${TARGET_TRIM}" "" "${VNET_DEFAULT_INTERFACE}")
+        vnet_requirements
     else
         # If there are multiple IP/NIC let the user configure network
         if [ -n "${IPV4_CONFIG}" ]; then
@@ -335,6 +341,17 @@ workout_components() {
     fi
 }
 
+vnet_requirements() {
+    # VNET jib script requirement
+    if [ ! "$(command -v jib)" ]; then
+        if [ -f "/usr/share/examples/jails/jib" ] && [ ! -f "/usr/local/bin/jib" ]; then
+            install -m 0544 /usr/share/examples/jails/jib /usr/local/bin/jib
+        else
+            warn "Warning: Unable to locate/install jib script required by VNET jails."
+        fi
+    fi
+}
+
 config_netif() {
     # Get interface from bastille configuration
     if [ -n "${bastille_network_loopback}" ]; then