Replace wait_for_database with depends_on and healthcheck.

docker-compose.yml

@@ -3,6 +3,9 @@ version: '3'
 services:
 
   db:
+    healthcheck:
+        test: ["CMD-SHELL", "pg_isready -U postgres"]
+        interval: 2s
     image: postgis/postgis:14-3.3-alpine
     environment:
       - POSTGRES_HOST_AUTH_METHOD=trust
@@ -10,6 +13,9 @@ services:
       - db:/var/lib/postgresql/data
 
   app:
+    depends_on:
+      db:
+        condition: service_healthy
     image: umap/umap:1.3.2
     ports:
       - "${PORT-8000}:8000"

docker/entrypoint.sh

@@ -3,24 +3,6 @@ set -eo pipefail
 
 source /venv/bin/activate
 
-# default variables
-: "${SLEEP:=1}"
-: "${TRIES:=60}"
-
-function wait_for_database {(
-  echo "Waiting for database to respond..."
-  tries=0
-  while true; do
-    [[ $tries -lt $TRIES ]] || return
-    (echo "from django.db import connection; connection.connect()" | umap shell) >/dev/null
-    [[ $? -eq 0 ]] && return
-    sleep $SLEEP
-    tries=$((tries + 1))
-  done
-)}
-
-# first wait for the database
-wait_for_database
 # then migrate the database
 umap migrate
 # then collect static files