#!/usr/bin/env bash
##
# Copyright (C) 2013-2016 Janek Bevendorff
# Website: http://www.refining-linux.org/
# 
# Rotate backup revisions. Intended for use with cron.
# 
# The MIT License (MIT)
#
# 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.
##

if [ "$1" == "" ]; then
	echo "Usage: $(basename $0) <rsnapshot config>"
	exit
fi

if [ "$RSYNC_EXIT_STATUS" == "" ]; then
	echo "This script is intended to be run as rsync post-xfer hook." 2>&1
	exit 1
fi

# rsync exit code descriptions found at
# <https://lxadm.com/Rsync_exit_codes>
msg="unknown code"
case $RSYNC_EXIT_STATUS in
	 0) msg="Success" ;;
	 1) msg="Syntax or usage error" ;;
	 2) msg="Protocol incompatibility" ;;
	 3) msg="Errors selecting input/output files, dirs" ;;
	 4) msg="Requested  action not supported: an attempt was made to manipulate 64-bit files on a platformi " \
	        "that cannot support them; or an option was specified that is supported by the client and not by the server" ;;
	 5) msg="Error starting client-server protocol" ;;
	 6) msg="Daemon unable to append to log-file" ;;
	10) msg="Error in socket I/O" ;;
	11) msg="Error in file I/O" ;;
	12) msg="Error in rsync protocol data stream" ;;
	13) msg="Errors with program diagnostics" ;;
	14) msg="Error in IPC code" ;;
	20) msg="Received SIGUSR1 or SIGINT" ;;
	21) msg="Some error returned by waitpid()" ;;
	22) msg="Error allocating core memory buffers" ;;
	23) msg="Partial transfer due to error" ;;
	24) msg="Partial transfer due to vanished source files" ;;
	25) msg="The --max-delete limit stopped deletions" ;;
	30) msg="Timeout in data send/receive" ;;
	35) msg="Timeout waiting for daemon connection" ;;
esac

if [ $RSYNC_EXIT_STATUS -eq 0 ] || [ $RSYNC_EXIT_STATUS -eq 24 ]; then
	rs-logger info "Backup for user '$(id -un)' finished with exit code ${RSYNC_EXIT_STATUS} (${msg})"
    RSNAPSHOT="rsnapshot"
    if [ -x /usr/bin/rsnapshot ]; then
        RSNAPSHOT="/usr/bin/rsnapshot"
    elif [ -x /opt/bin/rsnapshot ]; then
        RSNAPSHOT="/opt/bin/rsnapshot"
    fi
    $RSNAPSHOT -c "$1" push
	rsnapshot_exit_code=$?
	if [ $rsnapshot_exit_code -eq 1 ]; then
		rs-logger err "Backup rotation for level 'push' of user '$(id -un)' failed."
	elif [ $rsnapshot_exit_code -eq 2 ]; then
		rs-logger warn "Backup rotation for level 'push' of user '$(id -un)' finished with warnings."
	else
		rs-logger info "Backup rotation for level 'push' of user '$(id -un)' finished."
	fi
else
	rs-logger err "Backup for user '$(id -un)' failed with exit code ${RSYNC_EXIT_STATUS} (${msg})"
fi