wait-for-mongo

#!/bin/bash

MONGODB_HOSTNAME=${MONGODB_HOSTNAME:-${MONGODB_HOST:-"localhost"}}
MONGODB_PORT=${MONGODB_PORT:-27017}
MONGODB_USERNAME=${MONGODB_USERNAME:-${MONGODB_USER}}
MONGODB_PASSWORD=${MONGODB_PASSWORD:-${MONGODB_PASS}}
MONGODB_DSN=${MONGODB_DSN:-"mongodb://${MONGODB_USERNAME}:${MONGODB_PASSWORD}@${MONGODB_HOSTNAME}:${MONGODB_PORT}"}
echo -e "\nWaiting for MongoDB (mongodb://${MONGODB_HOSTNAME}:${MONGODB_PORT}) ..."

while ! mongosh --eval 'db.runCommand("ping").ok' --quiet "${MONGODB_DSN}" > /dev/null 2>&1; do
    sleep 1
    echo -n "."
done

echo -e "\n > Connected to MongoDB!"