#! /bin/sh
# @(#) This script is my personal backup script.
#
# Personal Backup Script.
#
#	Written by seirios@seirios.org
#
#	Need bkup.conf.
#
#	***WARNING***
#	This script runs on NetBSD 6 or CentOS 6.
#
# $Id:$
#

echo "System backup start."

##### Prepare to run.

# DEBUGGING.
#DEBUG=1
# Under debugging, only show all command line. not execute
if [ "x"$DEBUG = "x" ]; then
	EVAL="eval"
else
	EVAL="echo"
fi

CONF=./bkup.conf

# Tempolary file.
CONFTMP=".conftmp"; [ -f $CONFTMP ] && rm -f $CONFTMP
BKDIR="./.bkdir";   [ -f $BKDIR ] && rm -f $BKDIR
BKMYSQL="MYSQL";    [ -f $BKMYSQL ] && rm -f $BKMYSQL

UNAME=`which uname`;         [ "x"$DEBUG != "x" ] && echo "uname     : $UNAME"
CAT=`which cat`;             [ "x"$DEBUG != "x" ] && echo "cat       : $CAT"
GREP=`which grep`;           [ "x"$DEBUG != "x" ] && echo "grep      : $GREP"
CUT=`which cut`;             [ "x"$DEBUG != "x" ] && echo "cut       : $CUT"
TAR=`which tar`;             [ "x"$DEBUG != "x" ] && echo "tar       : $TAR"
GZIP=`which gzip`;           [ "x"$DEBUG != "x" ] && echo "gzip      : $GZIP"
MV=`which mv`;               [ "x"$DEBUG != "x" ] && echo "mv        : $MV"
MYSQLDUMP=`which mysqldump`; [ "x"$DEBUG != "x" ] && echo "mysqldump : $MYSQLDUMP"

OSNAME=`$UNAME -s`;

ROTATE=""			# Log rotate generation.
MYSQL="0"			# Backup MySQL?
MYSQLPASS=""			# MySQL Password

##### Parse commandline argument.

[ $# -gt 1 ] && echo "Too match argument. exit." && exit
[ $# -eq 1 ] && CONF=${1}
[ ! -f $CONF ] && echo "Configuration file is not found. exit." && exit
                             [ "x"$DEBUG != "x" ] && echo "Conf      : $CONF"

##### Parse configuration file.

# ***WARNING***: while loop must runs current shell(not subshell), so runs exec.
$CAT $CONF | $GREP -v '^#' | $GREP -v '^$' > $CONFTMP
exec < $CONFTMP
while read line; do
	FLAG=`echo ${line} | $CUT -d " " -f 1`

	INIT=`echo ${line} | $CUT -b 1`
	if [ $INIT = "[" ]; then
		[ $FLAG = "[CONF]" ]  && BLOCK="CONF"   && continue
		[ $FLAG = "[FILE]" ]  && BLOCK=$BKDIR   && continue
		[ $FLAG = "[MYSQL]" ] && BLOCK=$BKMYSQL && continue
		echo "Unknown BLOCK. Check Configuration." && exit
	fi

	[ x"$BLOCK" = "x" ] && echo "BLOCK is invalid. Check Configuration." && exit

	# Configuratin.
	if [ $BLOCK = "CONF" ]; then
		[ $FLAG = "LOGGEN" ]  && ROTATE=`echo ${line} | $CUT -d " " -f 2`
		[ $FLAG = "BKUPDIR" ] && BKUPDIR=`echo ${line} | $CUT -d " " -f 2` && \
			[ ! -d $BKUPDIR ] && echo "Backup Dir is not exist" && exit
	fi

	# File BLOCK
	[ $BLOCK = $BKDIR ] && [ $FLAG -eq 1 ] && \
		echo "`echo ${line} | $CUT -d " " -f 2`" >> $BLOCK

	# MySQL BLOCK
	[ $BLOCK = $BKMYSQL ] && [ $FLAG -eq 1 ] && \
		MYSQL=1
		MYSQLPASS=`echo ${line} | $CUT -d " " -f 2`
done

[ "x"$DEBUG != "x" ] && \
	echo "OS name   : $OSNAME" &&		\
	echo "Log gen   : $ROTATE" &&		\
	echo "MySQL Bkup: $MYSQL" &&		\
	echo "MySQL Pass: $MYSQLPASS" &&	\
	echo "Target Dir: see $BKDIR";

##### Rotate Backup File
[ "x"$DEBUG != "x" ] && echo "===== Rotate Backup ====="
ROTATE=$(( $ROTATE - 1 ))
while (true); do
	ROTATEFROM=$(( $ROTATE - 1 ))
	[ -f $BKUPDIR/bkup.tgz.$ROTATEFROM ] && \
		$EVAL "$MV $BKUPDIR/bkup.tgz.$ROTATEFROM $BKUPDIR/bkup.tgz.$ROTATE"
	[ -f $BKUPDIR/pkg.txt.$ROTATEFROM ] && \
		$EVAL "$MV $BKUPDIR/pkg.txt.$ROTATEFROM $BKUPDIR/pkg.txt.$ROTATE"
	[ -f $BKUPDIR/mysqldump.sql.gz.$ROTATEFROM ] && \
		$EVAL "$MV $BKUPDIR/mysqldump.sql.gz.$ROTATEFROM $BKUPDIR/mysqldump.sql.gz.$ROTATE"
	ROTATE=$ROTATEFROM
	[ $ROTATE -lt 2 ] && break
done
[ -f $BKUPDIR/bkup.tgz ] && \
	$EVAL "$MV $BKUPDIR/bkup.tgz $BKUPDIR/bkup.tgz.1"
[ -f $BKUPDIR/pkg.txt ] && \
	$EVAL "$MV $BKUPDIR/pkg.txt $BKUPDIR/pkg.txt.1"
[ -f $BKUPDIR/mysqldump.sql.gz ] && \
	$EVAL "$MV $BKUPDIR/mysqldump.sql.gz $BKUPDIR/mysqldump.sql.gz.1"

##### File backup
[ "x"$DEBUG != "x" ] && echo "===== File Backup ====="
$EVAL "$TAR -cz -T $BKDIR -f $BKUPDIR/bkup.tgz"

##### Installed package list
[ "x"$DEBUG != "x" ] && echo "===== Get package List ====="
[ $OSNAME = "NetBSD" ] && $EVAL "/usr/sbin/pkg_info -a > $BKUPDIR/pkg.txt"
[ $OSNAME = "Linux" ]  && $EVAL "/usr/bin/yum list installed > $BKUPDIR/pkg.txt"

##### MySQL backup.
[ "x"$DEBUG != "x" ] && echo "===== MySQL Backup ====="
if [ $MYSQL != "0" -a "x"$MYSQLDUMP != "x" -a "x"MYSQLPASS != "x" ]; then
	$EVAL "$MYSQLDUMP -u root -A -a -e --password=\"$MYSQLPASS\" | $GZIP -9c > $BKUPDIR/mysqldump.sql.gz"
fi

##### Cleanup
[ "x"$DEBUG != "x" ] && [ -f $CONFTMP ] && rm -f $CONFTMP
[ "x"$DEBUG != "x" ] && [ -f $BKDIR ]   && rm -f $BKDIR
[ "x"$DEBUG != "x" ] && [ -f $BKMYSQL ] && rm -f $BKMYSQL

echo "done."