fetch GeoLite2-Country.mmdb.gz after 30 days of file age

thirdparty/fetch-geoip-db.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+# Die on any error for Travis CI to automatically retry:
+set -e
+
+download_dir="${0%/*}/download"
+mkdir -p "${download_dir}"
+cd "${download_dir}"
+
+filename="GeoLite2-Country.mmdb.gz"
+
+# Database does not exist or is older than 30 days.
+if [[ ! -e $filename ]] || [[ -n $(find . -name $filename -mtime +30 -print) ]]; then
+	rm -f $filename
+	echo "Updating GeoIP country database from MaxMind."
+	curl -s -L -O http://geolite.maxmind.com/download/geoip/database/$filename
+	cp $filename ../..
+fi
+