From 3afee66aaa1a06db46aea97c29aae4e4f68b8713 Mon Sep 17 00:00:00 2001
From: Jonas Winkler <jonas.winkler@jpwinkler.de>
Date: Sat, 21 Nov 2020 20:14:48 +0100
Subject: [PATCH] updated entrypoint script to wait for postgres

---
 docker/docker-entrypoint.sh | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/docker/docker-entrypoint.sh b/docker/docker-entrypoint.sh
index c6e0d1cab..dfa7cfc65 100644
--- a/docker/docker-entrypoint.sh
+++ b/docker/docker-entrypoint.sh
@@ -15,8 +15,42 @@ map_uidgid() {
     fi
 }
 
+
+wait_for_postgres() {
+	attempt_num=1
+	max_attempts=5
+
+	echo "Waiting for PostgreSQL to start..."
+
+	host="${PAPERLESS_DBHOST}"
+
+	while !</dev/tcp/$host/5432 ;
+	do
+
+		if [ $attempt_num -eq $max_attempts ]
+		then
+			echo "Unable to connect to database."
+			exit 1
+		else
+			echo "Attempt $attempt_num failed! Trying again in 5 seconds..."
+
+		fi
+
+		attempt_num=$(expr "$attempt_num" + 1)
+		sleep 5
+	done
+
+
+}
+
+
 migrations() {
 
+	if [[ -n "${PAPERLESS_DBHOST}" ]]
+	then
+		wait_for_postgres
+	fi
+
 	(
 		# flock is in place to prevent multiple containers from doing migrations
 		# simultaneously. This also ensures that the db is ready when the command