rabbitmq-server/packaging/docker-image/docker-entrypoint.sh

#!/usr/bin/env bash
set -euo pipefail

# allow the container to be started with `--user`
if [[ "$1" == rabbitmq* ]] && [ "$(id -u)" = '0' ]; then
	if [ "$1" = 'rabbitmq-server' ]; then
		find /var/lib/rabbitmq \! -user rabbitmq -exec chown rabbitmq '{}' +
	fi

	exec gosu rabbitmq "$BASH_SOURCE" "$@"
fi

deprecatedEnvVars=(
	RABBITMQ_DEFAULT_PASS_FILE
	RABBITMQ_DEFAULT_USER_FILE
	RABBITMQ_MANAGEMENT_SSL_CACERTFILE
	RABBITMQ_MANAGEMENT_SSL_CERTFILE
	RABBITMQ_MANAGEMENT_SSL_DEPTH
	RABBITMQ_MANAGEMENT_SSL_FAIL_IF_NO_PEER_CERT
	RABBITMQ_MANAGEMENT_SSL_KEYFILE
	RABBITMQ_MANAGEMENT_SSL_VERIFY
	RABBITMQ_SSL_CACERTFILE
	RABBITMQ_SSL_CERTFILE
	RABBITMQ_SSL_DEPTH
	RABBITMQ_SSL_FAIL_IF_NO_PEER_CERT
	RABBITMQ_SSL_KEYFILE
	RABBITMQ_SSL_VERIFY
	RABBITMQ_VM_MEMORY_HIGH_WATERMARK
)
hasOldEnv=
for old in "${deprecatedEnvVars[@]}"; do
	if [ -n "${!old:-}" ]; then
		echo >&2 "error: $old is set but deprecated"
		hasOldEnv=1
	fi
done
if [ -n "$hasOldEnv" ]; then
	echo >&2 'error: deprecated environment variables detected'
	echo >&2
	echo >&2 'Please use a configuration file instead; visit https://www.rabbitmq.com/configure.html to learn more'
	echo >&2
	exit 1
fi

# if long and short hostnames are not the same, use long hostnames
if [ -z "${RABBITMQ_USE_LONGNAME:-}" ] && [ "$(hostname)" != "$(hostname -s)" ]; then
	: "${RABBITMQ_USE_LONGNAME:=true}"
fi

exec "$@"