#!/bin/bash
# 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.

set -e

# first arg is `-something` or `+something`
if [ "${1#-}" != "$1" ] || [ "${1#+}" != "$1" ]; then
	set -- /opt/couchdb/bin/couchdb "$@"
fi

# first arg is the bare word `couchdb`
if [ "$1" = 'couchdb' ]; then
	shift
	set -- /opt/couchdb/bin/couchdb "$@"
fi

if [ "$1" = '/opt/couchdb/bin/couchdb' ]; then
	# this is where runtime configuration changes will be written.
	# we need to explicitly touch it here in case /opt/couchdb/etc has
	# been mounted as an external volume, in which case it won't exist.
	# If running as the couchdb user (i.e. container starts as root),
	# write permissions will be granted below.
	touch /opt/couchdb/etc/local.d/docker.ini

	# if user is root, assume running under the couchdb user (default)
	# and ensure it is able to access files and directories that may be mounted externally
	if [ "$(id -u)" = '0' ]; then
		# Check that we own everything in /opt/couchdb and fix if necessary. We also
		# add the `-f` flag in all the following invocations because there may be
		# cases where some of these ownership and permissions issues are non-fatal
		# (e.g. a config file owned by root with o+r is actually fine), and we don't
		# to be too aggressive about crashing here ...
		find /opt/couchdb \! \( -user couchdb -group couchdb \) -exec chown -f couchdb:couchdb '{}' +

		# Ensure that data files have the correct permissions. We were previously
		# preventing any access to these files outside of couchdb:couchdb, but it
		# turns out that CouchDB itself does not set such restrictive permissions
		# when it creates the files. The approach taken here ensures that the
		# contents of the datadir have the same permissions as they had when they
		# were initially created. This should minimize any startup delay.
		find /opt/couchdb/data -type d ! -perm 0755 -exec chmod -f 0755 '{}' +
		find /opt/couchdb/data -type f ! -perm 0644 -exec chmod -f 0644 '{}' +

		# Do the same thing for configuration files and directories. Technically
		# CouchDB only needs read access to the configuration files as all online
		# changes will be applied to the "docker.ini" file below, but we set 644
		# for the sake of consistency.
		find /opt/couchdb/etc -type d ! -perm 0755 -exec chmod -f 0755 '{}' +
		find /opt/couchdb/etc -type f ! -perm 0644 -exec chmod -f 0644 '{}' +
	fi

	if [ ! -z "$NODENAME" ] && ! grep "couchdb@" /opt/couchdb/etc/vm.args; then
		echo "-name couchdb@$NODENAME" >> /opt/couchdb/etc/vm.args
	fi

	if [ "$COUCHDB_USER" ] && [ "$COUCHDB_PASSWORD" ]; then
		# Create admin only if not already present
		if ! grep -Pzoqr "\[admins\]\n$COUCHDB_USER =" /opt/couchdb/etc/local.d/*.ini /opt/couchdb/etc/local.ini; then
			printf "\n[admins]\n%s = %s\n" "$COUCHDB_USER" "$COUCHDB_PASSWORD" >> /opt/couchdb/etc/local.d/docker.ini
		fi
	fi

	if [ "$COUCHDB_SECRET" ]; then
		# Set secret only if not already present
		if ! grep -Pzoqr "\[chttpd_auth\]\nsecret =" /opt/couchdb/etc/local.d/*.ini /opt/couchdb/etc/local.ini; then
			printf "\n[chttpd_auth]\nsecret = %s\n" "$COUCHDB_SECRET" >> /opt/couchdb/etc/local.d/docker.ini
		fi
	fi

	if [ "$COUCHDB_ERLANG_COOKIE" ]; then
		cookieFile='/opt/couchdb/.erlang.cookie'
		if [ -e "$cookieFile" ]; then
			if [ "$(cat "$cookieFile" 2>/dev/null)" != "$COUCHDB_ERLANG_COOKIE" ]; then
				echo >&2
				echo >&2 "warning: $cookieFile contents do not match COUCHDB_ERLANG_COOKIE"
				echo >&2
			fi
		else
			echo "$COUCHDB_ERLANG_COOKIE" > "$cookieFile"
		fi
		chown couchdb:couchdb "$cookieFile"
		chmod 600 "$cookieFile"
	fi

	if [ "$(id -u)" = '0' ]; then
		chown -f couchdb:couchdb /opt/couchdb/etc/local.d/docker.ini || true
	fi

	# if we don't find an [admins] section followed by a non-comment, display a warning
        if ! grep -Pzoqr '\[admins\]\n[^;]\w+' /opt/couchdb/etc/default.d/*.ini /opt/couchdb/etc/local.d/*.ini /opt/couchdb/etc/local.ini; then
		# The - option suppresses leading tabs but *not* spaces. :)
		cat >&2 <<-'EOWARN'
*************************************************************
ERROR: CouchDB 3.0+ will no longer run in "Admin Party"
       mode. You *MUST* specify an admin user and
       password, either via your own .ini file mapped
       into the container at /opt/couchdb/etc/local.ini
       or inside /opt/couchdb/etc/local.d, or with
       "-e COUCHDB_USER=admin -e COUCHDB_PASSWORD=password"
       to set it via "docker run".
*************************************************************
EOWARN
		exit 1
	fi

	if [ "$(id -u)" = '0' ]; then
		export HOME=$(echo ~couchdb)
		exec setpriv --reuid=couchdb --regid=couchdb --clear-groups "$@"
	fi
fi

exec "$@"
