Fix duplicate route table entries added to route table file

Given duplicate route entries can be added because of different
route types, we need to account for this in the route table addition
logic to ensure only a single route table gets added in case multiple
routes from that table exist.

Fixes #11

ansible/roles/cloudinit/files/var/lib/vmware/ovf-to-cloud-init.sh

@@ -38,6 +38,8 @@ management_gw_key="network.management_gateway"
 workload_gw_key="network.workload_gateway"
 frontend_gw_key="network.frontend_gateway"
 
+workload_routes_key="network.workload.routes"
+
 # These are the display names for the nics
 management_net_name="management"
 workload_net_name="workload"
@@ -84,6 +86,10 @@ escapeString () {
     echo "$escaped"
 }
 
+getWorkloadRoutes() {
+  routes=$(ovf-rpctool get.ovf "${workload_routes_key}")
+}
+
 # Persist a string to a file
 # Input values:
 # - The string to write

ansible/roles/vmware/files/var/lib/vmware/routetablectl.sh

@@ -118,12 +118,26 @@ function down_routes() {
   mv -f "${RT_TABLES_FILE}.tmp" "${RT_TABLES_FILE}"
 }
 
+# Adds route tables to the route tables file. Prevents duplicates from being added.
+add_route_tables() {
+  tables=$(grep -E '^\w' "${CONFIG_FILE}" | cut -d, -f1,2 | uniq)
+  for table in ${tables}; do
+    IFS=, read -ra line <<< "${table}"
+    cfg_table_id="${line[0]}"
+    cfg_table_name="${line[1]}"
+    echo2 "create new route table id=${cfg_table_id} name=${route_table_name}"
+    printf '%d\t%s\n' "${cfg_table_id}" "${route_table_name}" >>"${RT_TABLES_FILE}"
+  done
+}
+
 # Enables the custom route tables.
 function up_routes() {
   # Enabling the custom route tables first requires removing any custom route
   # tables.
   down_routes
 
+  add_route_tables
+
   while IFS= read -r line; do
     # Skip empty and commented lines.
     if [ -z "${line}" ] || [ "${line::1}" == "#" ]; then
@@ -147,10 +161,6 @@ function up_routes() {
     cfg_dev="$(dev_from_mac "${cfg_mac_addr}")"
     route_table_name="${RT_TABLE_NAME_PREFIX}${cfg_table_name}"
 
-    # Create a new route table.
-    echo2 "create new route table id=${cfg_table_id} name=${route_table_name}"
-    printf '%d\t%s\n' "${cfg_table_id}" "${route_table_name}" >>"${RT_TABLES_FILE}"
-
     if [[ "${cfg_gateway}" == "" ]]; then
         cfg_destination=$(python3 -c "import sys; import ipaddress; print(ipaddress.ip_network(sys.argv[1], strict=False))" "${cfg_cidr}")
         host="$(echo "${cfg_cidr}" | cut -d/ -f 1)"