#!/bin/bash

# Copyright (c) 2009, 2010, 2012 Peter Palfrader
# Copyright (c) 2015 Aurelien Jarno
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

set -e
set -u

MYLOGNAME="`basename "$0"`[$$]"
RSYNCDIRS=(/srv/upload.debian.org/UploadQueue/ /srv/security.upload.debian.org/SecurityUploadQueue/)

usage() {
	echo "local Usage: $0 <host>"
	echo "via ssh orig command: rsync <stuff>"
}

one_more_arg() {
	if [ "$#" -lt 1 ]; then
		usage >&2
		exit 1
	fi
}

info() {
	logger -p daemon.info -t "$MYLOGNAME" "$1"
}

croak() {
	logger -s -p daemon.warn -t "$MYLOGNAME" "$1"
	exit 1
}

do_rsync() {
	local remote_host="$1"
	shift

	local allowed_rsyncs
	allowed_rsyncs=()

	local rsyncdir
	for rsyncdir in "${RSYNCDIRS[@]}"; do
		if [ -d "$rsyncdir" ]; then
			allowed_rsyncs+=("--server -vlogDtprxze.iLsf --partial . $rsyncdir") # wheezy
			allowed_rsyncs+=("--server -vlogDtprxze.iLsfx --partial . $rsyncdir") # jessie
			allowed_rsyncs+=("--server -vlogDtprxze.iLsfxC --partial . $rsyncdir") # stretch
		fi
	done
	for cmd_idx in ${!allowed_rsyncs[*]}; do
		allowed="${allowed_rsyncs[$cmd_idx]}"
		if [ "$*" = "$allowed" ]; then
			info "Running for host $remote_host: rsync $*"
			exec rsync --chmod=F640 "$@"
			croak "Exec failed"
		fi
	done

	info "NOT allowed for $remote_host: rsync $*"
	echo >&2 "This rsync command ($@) not allowed."
	exit 1
}

if [ "${1:-}" = "-h" ] || [ "${1:-}" = "--help" ]; then
	usage
	exit 0
fi

one_more_arg "$@"
remote_host="$1"
shift


# check/parse remote command line
if [ -z "${SSH_ORIGINAL_COMMAND:-}" ] ; then
	croak "Did not find SSH_ORIGINAL_COMMAND"
fi
set "dummy" ${SSH_ORIGINAL_COMMAND}
shift

info "host $remote_host called with $*"

one_more_arg "$@"
action="$1"
shift

case "$action" in
	# rsync command to upload packages
	rsync)
		do_rsync "$remote_host" "$@"
		;;
	# just ignore any other commands (e.g. chmod)
	*)
		info "Ignored operation '$action'"
		;;
esac