initial version

docker/mongo-init.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# Initiates the single-node replica set "rs0" if it does not exist yet and
+# waits until the member is primary. Runs as a one-shot container.
+set -euo pipefail
+
+HOST="${MONGO_HOST:-al-mongo}"
+PORT="${MONGO_PORT:-27017}"
+
+echo "Waiting for MongoDB at ${HOST}:${PORT} ..."
+until mongosh --host "${HOST}" --port "${PORT}" --quiet \
+	--eval 'db.adminCommand({ ping: 1 }).ok' >/dev/null 2>&1; do
+	sleep 2
+done
+
+if [ "$(mongosh --host "${HOST}" --port "${PORT}" --quiet \
+	--eval 'try { rs.status().ok } catch (e) { 0 }')" != "1" ]; then
+	echo "Initiating replica set rs0 ..."
+	mongosh --host "${HOST}" --port "${PORT}" --quiet \
+		--eval 'rs.initiate({ _id: "rs0", members: [{ _id: 0, host: "al-mongo:27017" }] })'
+fi
+
+echo "Waiting for primary ..."
+until mongosh --host "${HOST}" --port "${PORT}" --quiet \
+	--eval 'db.hello().isWritablePrimary' | grep -q true; do
+	sleep 2
+done
+
+echo "Replica set rs0 is ready."