minio/dockerscripts/docker-entrypoint.sh
Harshavardhana 55dd017e62 Deprecate auto detection of container user (#7930)
There is no reliable way to handle fallbacks for
MinIO deployments, due to various command line
options and multiple locations which require
access inside container.

Parsing command line options is tricky to figure
out which is the backend disk etc, we did try
to fix this in implementations of check-user.go
but it wasn't complete and introduced more bugs.

This PR simplifies the entire approach to rather
than running Docker container as non-root by default
always, it allows users to opt-in. Such that they
are aware that that is what they are planning to do.

In-fact there are other ways docker containers can
be run as regular users, without modifying our
internal behavior and adding more complexities.
2019-07-17 19:20:55 +01:00

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#!/bin/sh
#
# MinIO Cloud Storage, (C) 2019 MinIO, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# If command starts with an option, prepend minio.
if [ "${1}" != "minio" ]; then
if [ -n "${1}" ]; then
set -- minio "$@"
fi
fi
## Look for docker secrets in default documented location.
docker_secrets_env() {
ACCESS_KEY_FILE="/run/secrets/$MINIO_ACCESS_KEY_FILE"
SECRET_KEY_FILE="/run/secrets/$MINIO_SECRET_KEY_FILE"
if [ -f "$ACCESS_KEY_FILE" ] && [ -f "$SECRET_KEY_FILE" ]; then
if [ -f "$ACCESS_KEY_FILE" ]; then
MINIO_ACCESS_KEY="$(cat "$ACCESS_KEY_FILE")"
export MINIO_ACCESS_KEY
fi
if [ -f "$SECRET_KEY_FILE" ]; then
MINIO_SECRET_KEY="$(cat "$SECRET_KEY_FILE")"
export MINIO_SECRET_KEY
fi
fi
}
# su-exec to requested user, if service cannot run exec will fail.
docker_switch_user() {
if [ -z "${MINIO_USERNAME}" ] || [ -z "${MINIO_GROUPNAME}" ]; then
addgroup -S "$MINIO_GROUPNAME" >/dev/null 2>&1 && \
adduser -S -G "$MINIO_GROUPNAME" "$MINIO_USERNAME" >/dev/null 2>&1
exec su-exec "${MINIO_USERNAME}:${MINIO_GROUPNAME}" "$@"
else
# fallback
exec "$@"
fi
}
## Set access env from secrets if necessary.
docker_secrets_env
## Switch to user if applicable.
docker_switch_user "$@"