Execute a hook in './hooks/<service>/<action>' when that event is received - with hook for first start up

compose-hooks.sh

#!/usr/bin/env bash
set -e

declare -A first_start

function handle_event() {
    local entry="$1"
    local action=$(echo $entry | jq -r '.action')
    local service=$(echo $entry | jq -r '.service')
    local hook="./hooks/$service/$action"
    if [ -x "$hook" ]; then
        "$hook" "$entry"
    fi
    
    if [ "$action" == "create" ]; then
        first_start["$service"]=1
    fi

    if [ "$action" == "start" ] && [ "${first_start[$service]}" -eq "1" ]; then
        unset first_start["$service"]
        local subhook="./hooks/$service/first_start"
        if [ -x "$subhook" ]; then
            "$subhook" "$entry"
        fi
    fi
}

docker-compose events --json | (
    while read line; do
        handle_event "$line"
    done
)