Backup/restore script for debian packages

debian-backup

#!/bin/bash
# ---------------------------------------------------------------------------
# debian-backup - Tool for backup/restore debian packages

# Copyright 2013, Miguel A. Baldi Horlle ([email protected])

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program 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 General Public License at (http://www.gnu.org/licenses/) for
# more details.

# Defaults
_EXEC_MODE=""
_BKP_FOLDER="debian.bak"

usage() { 
    echo "Usage: $0 [-b [<BACKUP_FOLDER>]] | [-r [<BACKUP_FOLDER>]]" 1>&2;
    echo "Examples" 1>&2;
    echo "" 1>&2;
    echo "  Backup debian repositories and installed packages information" 1>&2;
    echo "  to default folder: $(pwd)/$_BKP_FOLDER" 1>&2;
    echo "    terminal>$0 -b" 1>&2;
    echo "" 1>&2;
    echo "  Backup debian repositories and installed packages information" 1>&2;
    echo "  to folder: $(pwd)/mybackup" 1>&2;
    echo "    terminal>$0 -b mybackup" 1>&2;
    echo "" 1>&2;
    echo "  Restore debian repositories and installed packages information" 1>&2;
    echo "  from default folder: $(pwd)/$_BKP_FOLDER" 1>&2;
    echo "    terminal>$0 -r" 1>&2;
    echo "" 1>&2;
    echo "  Restore debian repositories and installed packages information" 1>&2;
    echo "  from folder: $(pwd)/mybackup" 1>&2;
    echo "    terminal>$0 -r mybackup" 1>&2;
    exit 2
}
check_tools() {
    hash dpkg 2>/dev/null || { 
        echo >&2 "In order to run we require 'dpkg' but it's not installed.  Aborting.";
        exit 1; 
    }
    hash apt-key 2>/dev/null || { 
        echo >&2 "In order to run we require 'apt-key' but it's not installed.  Aborting.";
        exit 1; 
    }
    hash apt-get 2>/dev/null || { 
        echo >&2 "In order to run we require 'apt-get' but it's not installed.  Aborting.";
        exit 1; 
    }
    hash sudo 2>/dev/null || { 
        echo >&2 "In order to run we require 'sudo' but it's not installed.  Aborting.";
        echo >&2 "Debian: apt-get install sudo";
        exit 1; 
    }
}

while getopts ":br" o; do
    case "${o}" in
        b)
            if [ -n "$_EXEC_MODE" ]; then
                echo "You can't specify both options at same time!"
            else
                _EXEC_MODE="backup"
            fi
            ;;
        r)
            if [ -n "$_EXEC_MODE" ]; then
                echo "You can't specify both options at same time!"
            else
                _EXEC_MODE="restore"
            fi
            ;;
        \?)
            usage
            ;;
    esac
done
shift $((OPTIND-1))
if [ -z "$_EXEC_MODE" ]; then
    echo "You must specify one of the preceding basic options!"
    usage
    exit 1
fi
echo "[debian-backup] executing $_EXEC_MODE ..."
echo "[debian-backup] checking tools..."
check_tools

# Custom backup folder informed
if [ -n "$1" ]; then
    _BKP_FOLDER="$1"
fi
echo "[debian-backup] using backup folder[$_BKP_FOLDER]"
    
echo "[debian-backup] in order to proceed, we need sudo here. Sorry"
echo ""

case "$_EXEC_MODE" in
    backup)
        mkdir -p $_BKP_FOLDER
        echo "[debian-backup] backing up Debian package sources list..."
        sudo cp -Rv /etc/apt/sources.list* $_BKP_FOLDER
        echo "[debian-backup] backing up Debian installed packages list..."
        dpkg --get-selections > $_BKP_FOLDER/package.list
        echo "[debian-backup] backing up repositories GPG keys..."
        sudo apt-key exportall > $_BKP_FOLDER/repo.keys
        echo "[debian-backup] backup completed: "
        cd $_BKP_FOLDER
        echo "$(pwd)"
        ls -lh
        ;;
    restore)
        if [ ! -d "$_BKP_FOLDER" ]; then
            echo "Backup folder does not exist!"
            exit 3
        fi
        cd $_BKP_FOLDER
        echo "[debian-backup] restoring Debian package sources list..."
        sudo cp -Rv sources.list* /etc/apt/
        echo "[debian-backup] restoring repositories GPG keys..."
        sudo apt-key add repo.keys
        echo "[debian-backup] updating package information..."
        sudo apt-get update
        echo "[debian-backup] restoring Debian installed packages list..."
        sudo dpkg --set-selections < package.list
        echo "[debian-backup] installing Debian packages ..."
        sudo apt-get install dselect
        ;;
esac
echo "done!"