#!/bin/bash
# Backup script for Gentoo Linux
# Copyright Reto Glauser aka Blinkeye
# Distributed under the terms of the GNU General Public License v2
# Mailto: stage4 at blinkeye dot ch
# Forum post: http://forums.gentoo.org/viewtopic-t-312817.html
# Date: 20.04.2005
# Modify Date : 12.06.2005 by kkanari.org

version=v1.4.2

# these are the commands we actually need for the backup
command_list="echo tar hostname date split gzip bzip2"

# verify that each command we use exists
for command in $command_list; do
path=`which $command | grep "no $command in"`

if [ ! -x `which $command` -a "$path" ]; then
echo -e "\n\nERROR: $command not found! Check your \$command_list and/or your \$PATH"
exit -1
fi
done

# options for the tar command
tarOptions="--absolute-names --preserve-permissions --totals --ignore-failed-read --verbose --file"

# 백업본을 어디에 둘 것인가?
stage4Location=/backup/gentoo/stage4/

# 백업파일이름결정
stage4prefix=$(hostname)-stage4-`date +\%d.\%m.\%Y`

# 백업하지 않을 형식, 여기서는 공란으로 모두 백업하는 것을 말한다.
#exclude_pattern="--exclude=*.iso --exclude="*.bz2""
exclude_pattern=""

# these files/directories are always excluded
#백업하지 않을 디렉토리들의 목록이다. 나의 경우에는 /data를 제거하는 것을 추가했다.
default_exclude_list="
--exclude=/tmp/*
--exclude=/var/tmp/*
--exclude=/lost+found/*
--exclude=/dev/*
--exclude=/proc/*
--exclude=/mnt/*
--exclude=/sys/*
--exclude=/usr/portage/*
--exclude=/var/log/*
--exclude=$stage4Location
--exclude=/backup/*"
# depending on your choice these files or directories will additionally be excluded
#인터랙티브 백업을 선택했을 때 백업할 것인지를 물어보는 목록
custom_exclude_list="
--exclude=/usr/src/*
--exclude=/home/*"


# files/folder which are children of a folder in an exclude_list
default_include_list="
/var/log/emerge.log
/dev/null
/dev/console"

function verify()
{
for i in $1; do
if [ ! -e "`echo "$i" | cut -d'=' -f2 | cut -d'*' -f1`" ]; then echo "ERROR: `echo "$i" | cut -d'=' -f2` not found! Check your "$2
fi
done
}

echo ""

# check the folder/files stored in $custom_exclude_list exist
verify "$default_exclude_list" "\$default_exclude_list"

# check the folder/files stored in $default_exclude_list exist
verify "$custom_exclude_list" "\$custom_exclude_list"

# check the folder/files stored in $custom_exclude_list exist
verify "$default_include_list" "\$default_include_list"


# print out the version
echo -e "\nBackup script $version"
echo -e "===================="


# how do you want to backup?
echo -e "\nWhat do you want to do? (Use CONTROL-C to abort)\n
Fast (tar.gz):
(1) Minimal backup
(2) Interactive backup


Best (tar.bz2):
(3) Minimal backup
(4) Interactive backup\n"

while [ "$option" != '1' -a "$option" != '2' -a "$option" != '3' -a "$option" != '4' ]; do
echo -en "Please enter your option: "
read option
done

case $option in
[1,3])
stage4Name=$stage4Location/$stage4prefix-minimal.tar

default_exclude_list="$default_exclude_list $custom_exclude_list"

case $option in
1) stage4postfix="gz"
zip="gzip ";;
*) stage4postfix="bz2"
zip="bzip2 ";;
esac
;;

[2,4])
stage4Name=$stage4Location/$stage4prefix-custom.tar

for folder in $custom_exclude_list; do
echo -en "\nDo you want to backup" `echo "$folder" | cut -d'=' -f2`"? (y/n) "
read answer
while [ "$answer" != 'y' -a "$answer" != 'n' ]; do
echo -en "Do you want to backup" `echo "$folder" | cut -d'=' -f2`"? (y/n) "
read answer
done
if [ "$answer" == 'n' ]; then
default_exclude_list="$default_exclude_list $folder"
fi
done

case $option in
2) stage4postfix="gz"
zip="gzip";;
*) stage4postfix="bz2"
zip="bzip2";;
esac
;;
esac

tar_command="tar --create $tarOptions $stage4Name $default_include_list $exclude_pattern"
tar_command_append="tar $default_exclude_list $exclude_pattern $tarOptions $stage4Name -r /"
zip_command="$zip -f $stage4Name"

# show what will be done
echo -ne "\ncreating the stage4 at $stage4Location with the following command:\n\n"$tar_command
echo -n " && "$tar_command_append
echo -n " && "$zip_command

# everything is set, are you sure to continue?
echo -ne "\n\nDo you want to continue? (y/n) "
read answer
while [ "$answer" != 'y' ] && [ "$answer" != 'n' ]; do
echo -ne "Do you want to continue? (y/n) "
read answer
done

if [ "$answer" == 'y' ]; then

# check whether the file already exists (do that before the *.tar files have been created)
if [ -a "$stage4Name.$stage4postfix" ]; then
echo -en "\nDo you want to overwrite $stage4Name.$stage4postfix? (y/n) "
read answer
while [ "$answer" != 'y' ] && [ "$answer" != 'n' ]; do
echo -en "Do you want to overwrite $stage4Name.$stage4postfix? (y/n) "
read answer
done
if [ "$answer" == 'n' ]; then
echo -e "\n* There's nothing to do ... Exiting"
exit 0;
fi
fi

# if necessary, create the stage4Location
if [ ! -d "$stage4Location" ] ; then
echo "* creating directory $stage4Location"
mkdir -p $stage4Location
fi

# mount boot
echo -e "\n* mount boot\n"
mount /boot >/dev/null 2>&1

# do the backup
$tar_command
$tar_command_append
echo -e "\n* $zip $stage4Name"
$zip_command

# copy the current world file to the stage4 location
#echo -e "\n* creating stage4 overview $stage4Name.txt"
#cp /var/lib/portage/world $stage4Name.txt >/dev/null 2>&1

# finished, clean up
echo -e "* stage4 is done"
echo "* umounting boot"
umount /boot

else
echo -e "\n* There's nothing to do ... Exiting"
fi

# Split the archive into chunks (uncomment the 3 lines if you want to split the stage4)
#echo -e "* split $stage4Name.$stage4postfix"
#split --suffix-length=1 --bytes=690m $stage4Name.$stage4postfix "$stage4Name.$stage4postfix"_
#echo "* splitting is done"