#!/usr/bin/env bash
#
# source - functions acting on the source host.
#
# Copyright 2015 - 2019 Einhard Leichtfuß
#
# This file is part of rsync-backup.
#
# rsync-backup is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# rsync-backup is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with rsync-backup.  If not, see <https://www.gnu.org/licenses/>.
#


# Set up a new local mirror file tree on the source.
#
# requires: assert_is_dir, create_dir, replace_symlink,
#           $src_path, $src_mirror_reldir,
#           $RSYNC, ${rsync_args[@]}, ${filter_args[@]},
#           $DATEFMT,
#
function src_prepare
{
	local mirrors_dir="${src_path}/${src_mirror_reldir}"
	local old_mirror="${mirrors_dir}/old"
	local new_mirror="${mirrors_dir}/new"
	local tmp_mirror="${mirrors_dir}/tmp"
	local bakdate

	assert_is_dir "$src_path" || return $?

	message 'Create mirror of the source tree...'

	if [[ ! -d "$mirrors_dir" ]]
	then
		create_dir "$mirrors_dir" || return $?
		create_dir "$tmp_mirror" || return $?
		ln -s 'none' "$old_mirror" || return $RET_ERROR
	else
		replace_symlink "$new_mirror" "$old_mirror" || return $?
		create_dir "$tmp_mirror" || return $?
	fi

	"$RSYNC" \
		--exclude="/${src_mirror_reldir}/***" \
		"${rsync_args[@]}" \
		"${filter_args[@]}" \
		--link-dest="$src_path" \
		"${src_path}/" "$tmp_mirror" || return $RET_ERROR

	bakdate=`date +"$DATEFMT"`
	mv "$tmp_mirror" "${mirrors_dir}/${bakdate}" || return $RET_ERROR
	ln -s "$bakdate" "$new_mirror" || return $RET_ERROR

	message 'Finished creating mirror of the source tree.'

	return $RET_SUCCESS
}

# vi: ft=bash ts=2 sw=2 noet