Set custom facts persistently

Create /etc/ansible/facts.d/zerotier.fact on each node containing custom facts in json format. This can then be used to prevent pointless reconfiguration of existing nodes whenever a new one is added to the inventory. In this commit it merely skips the installation tasks.

files/set_facts.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+FACTS_DIR='/etc/ansible/facts.d'
+FACT_FILE="${FACTS_DIR}/zerotier.fact"
+NODE_STATUS=($(zerotier-cli status))
+NETWORKS=$(zerotier-cli listnetworks | tail -n+2)
+
+function file_content {
+    if [ ! -z "$NETWORKS" ]; then
+        echo "{"
+        echo "  \"node_id\":\"${NODE_STATUS[2]}\","
+        echo "  \"networks\": ["
+        while read -r; do
+            network=($REPLY)
+            echo "    {"
+            echo "    \"id\":\"${network[2]}\","
+            echo "    \"status\":\"${network[5]}\""
+            echo "    }"
+        done <<< $NETWORKS
+        echo "  ]"
+        echo "}"
+    else
+        echo "{\"node_id\":\"${NODE_STATUS[2]}\"}"
+    fi
+}
+
+if [ ! -d "$FACTS_DIR" ]; then
+    mkdir -p $FACTS_DIR
+fi
+
+file_content > $FACT_FILE
+
+
+# TO-DO
+# Consider something that hadles JSON better than Bash does
+# The above will fail when it runs in to more than 1 network