Wait for DB on boot

stacksmith/user-scripts/run.sh

@@ -1,10 +1,20 @@
 #!/bin/bash
-set -euxo pipefail
+set -euo pipefail
 
 readonly CONF=/build/env.config
 
 source ${CONF}
 
+# wait for DB
+check_db() {
+    mongo $MONGO_URL --eval "db.runCommand( { connectionStatus: 1} )" --quiet |  python -c 'import json,sys;obj=json.load(sys.stdin);code = 0 if obj["ok"]==1 else 1; sys.exit(code);'
+}
+until check_db; do
+    period=5
+    echo "Cannot connect to db, waiting ${period} seconds before trying again..."
+    sleep ${period}
+done
+
 cd /build
 echo "starting the wekan service..."
 node main.js