#!/bin/bash

# Copyright (C) 2009 Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


# This is an example ganeti script that should be run from cron on all
# nodes; it will archive the ganeti configuration into a separate
# directory tree via GIT, so that it is possible to restore the
# history of cluster configuration changes if needed

# The script requires the lockfile-progs package and the git software

# Note that since Ganeti 2.0, config.data is the authoritative source
# of configuration; as such, we don't need to backup the ssconf files,
# and the other files (server.pem, rapi.pem, hmac.key, known_hosts,
# etc.) do no hold critical data (they can be regenerated at will, as
# long as they are synchronised).

set -e

LOCALSTATEDIR=@LOCALSTATEDIR@
SYSCONFDIR=@SYSCONFDIR@

GANETIDIR=${LOCALSTATEDIR}/lib/ganeti
CONFIGDATA=${GANETIDIR}/config.data

GNTBKDIR=${LOCALSTATEDIR}/lib/gnt-config-backup
LOCKFILE=${LOCALSTATEDIR}/lock/gnt-config-backup

# exit if no ganeti config file (no cluster configured, or not M/MC)
test -f $CONFIGDATA || exit 0

# We use a simple lock method, since our script should be fast enough
# (no network, not talking to ganeti-masterd) that we don't expect to
# run over 5 minutes if the system is healthy
lockfile-create "$LOCKFILE" || exit 1
trap 'lockfile-remove $LOCKFILE' EXIT

test -d $GNTBKDIR || mkdir $GNTBKDIR

cd $GNTBKDIR

test -d .git || git init

cp -f $CONFIGDATA config.data
git add config.data
git commit -q -m "Automatic commit by gnt-config-backup"

touch last_run