Script to help pipelines detect postgres database containers ready

wait-for-pg-database.sh

#!/bin/bash

triesLimit=20 # Tries for 10s
isDatabaseReady() {
    local lastContainerName=$(docker ps -lq)
    local databaseReadyLogMessage="database system is ready to accept connections"
    echo $(docker logs $lastContainerName --tail 1 | grep -c "$databaseReadyLogMessage")
}
waitForDatabase() {
    local tries=0
    until [ $tries -gt $triesLimit -o $(isDatabaseReady) -gt 0 ]
    do
        sleep .5s
        ((tries++))
    done
}

waitForDatabase