Docker-official-images/test/tests/postgres-initdb/run.sh

#!/bin/bash
set -e

image="$1"
testDir="$(readlink -f "$(dirname "$BASH_SOURCE")")"

export POSTGRES_USER='my cool postgres user'
export POSTGRES_PASSWORD='my cool postgres password'
export POSTGRES_DB='my cool postgres database'

cname="postgres-container-$RANDOM-$RANDOM"
cid="$(
	docker run -d \
		-e POSTGRES_USER \
		-e POSTGRES_PASSWORD \
		-e POSTGRES_DB \
		--name "$cname" \
		-v "$testDir/initdb.sql:/docker-entrypoint-initdb.d/test.sql":ro \
		"$image"
)"
trap "docker rm -f $cid > /dev/null" EXIT

psql() {
	docker run --rm -i \
		--link "$cname":postgres \
		--entrypoint psql \
		-e PGPASSWORD="$POSTGRES_PASSWORD" \
		"$image" \
		--host postgres \
		--username "$POSTGRES_USER" \
		--dbname "$POSTGRES_DB" \
		--quiet --no-align --tuples-only \
		"$@"
}

tries=10
while ! echo 'SELECT 1' | psql &> /dev/null; do
	(( tries-- ))
	if [ $tries -le 0 ]; then
		echo >&2 'postgres failed to accept connetions in a reasonable amount of time!'
		echo 'SELECT 1' | psql # to hopefully get a useful error message
		false
	fi
	sleep 2
done

[ "$(echo 'SELECT COUNT(*) FROM test' | psql)" = 1 ]
[ "$(echo 'SELECT c FROM test' | psql)" = 'goodbye!' ]