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#!/bin/bash
#
# Shell script (BASH) used in cron to made a backup of the given directory in $1
# to the directory in $2

# In order to run this script, you must have following tools installed:
# - tar
# - gpg
# - rm
# - chown
# - chmod
#
#
# Installation
# Customize the script according to your need. You need to setup :
# - A list of folders, separated by space, and finished with the last /
# - The folder where the backup goes
# - A GPG passphrase
# - The file where to log the messages                         (default /var/log/backup.log)
# - The number of days the backups are stored         (default 5)
# - The owner uid                                                 (default root)
# - The owner gid                                                 (default root)
# - The owner rights                                                 (default 400)
#
# --------------------------------------------------------------------
# This is a free shell script under GNU GPL version 2.0 or above
# Copyright (C) 2005 ReFlectiv project.
# Feedback/comment/suggestions : http://www.reflectiv.net/
# -------------------------------------------------------------------------

# List of folders to save
LIST_F0LDERS=`/var/www/site1/ /var/www/site2/ /var/www/site3/`;

# Folder where the backups goes
BACKUP_FOLDER="/root/snapshoots/";

# The password for the archive
GPG_PASS="passphrase";

# File name where to log the messages
LOG_FILE="/var/log/backup.log";

# Number of days the archives are keeped
KEEPING_DAYS=5;

# UID & GID of the archived file
BU_UID="root";
BU_GID="root";

# Access rights to the archived file
BU_CHMOD=400;

# Only change if your UNIX stores bin in diffrent location
TAR="/bin/tar";
GPG="/usr/bin/gpg";
RM="/bin/rm";
CHOWN="/bin/chown";
CHMOD="/bin/chmod";
MKDIR="/bin/mkdir";

#######################################################################
# Do not change anything below
#######################################################################

# We mades the vars
UNIX_DATE=`date +"%Y_%m_%d"`;
CURRENT_DATE=`date +"%d/%m/%Y - %H:%M:%S"`;
TGZ_FILE=$UNIX_DATE".tgz";
GPG_FILE=$TGZ_FILE".gpg";

# Function called to log info into the file
function log {
        echo "["$CURRENT_DATE"] - "$1 >> $LOG_FILE;

        if [ ! $2 == "" ]; then
                exit 1;
        fi
}

log "Starting backup";

# Preliminary tests
[ -x $TAR ] || log "tar not find" 1;
[ -x $GPG ] || log "gpg not find" 1;
[ -x $RM ] || log "rm not find" 1;
[ -x $CHOWN ] || log "chown not find" 1;
[ -x $CHMOD ] || log "chmod not find" 1;
[ -x $MKDIR ] || log "mkdir not find" 1;

# We test if the file is correctly called
#[ $# -eq 2 ] || log "Invalid number of parameters" 1;

# We test if the destination folder exists
[ -d $BACKUP_FOLDER ] ||
log "The backup destination folder "$BACKUP_FOLDER" seems to not exists." 1;

for FOLDER in $LIST_F0LDERS
do
        # We test if the original folder exists
        [ -d $FOLDER ] || log "The folder "$FOLDER" does not exists !" 1;

        # We mades sample vars
        BACKUP_SUBFOLDER=`basename $FOLDER`;

        if [ ! -d $BACKUP_FOLDER$BACKUP_SUBFOLDER"/" ]; then
                # We create the folder
                $MKDIR $BACKUP_FOLDER$BACKUP_SUBFOLDER"/";

                # We set the same rights and acces as the archived/encrypted file
                $CHOWN $BU_UID:$BU_GID $BACKUP_FOLDER$BACKUP_SUBFOLDER"/";
                $CHMOD $BU_CHMOD $BACKUP_FOLDER$BACKUP_SUBFOLDER"/";
        fi

        # We goes to the backup folder
        cd $FOLDER;

        # We make the archive
        $TAR -czf $BACKUP_FOLDER$BACKUP_SUBFOLDER"/"$TGZ_FILE .
        # If an error occured ...
        [ $? -eq 0 ] || log "An error occured with the command tar" 1;

        # We goes to the backup directory
        cd $BACKUP_FOLDER$BACKUP_SUBFOLDER;

        # We encrypt the archive
        $GPG --yes -c --passphrase $GPG_PASS --s2k-cipher-algo RIJNDAEL256 $TGZ_FILE;
        # If an error occured ...
        [ $? -eq 0 ] || log "An error occured with the command gpg" 1;

        # We delete the archive
        $RM $TGZ_FILE;
        # If an error occured ...
        [ $? -eq 0 ] || log "An error occured with the command rm" 1;

        # We modify the user/groups for the file
        $CHOWN $BU_UID:$BU_GID $GPG_FILE;
        # If an error occured ...
        [ $? -eq 0 ] || log "An error occured with the command rm" 1;

        # We modify the chmod for the file
        $CHMOD $BU_CHMOD $GPG_FILE;
        # If an error occured ...
        [ $? -eq 0 ] || log "An error occured with the command rm" 1;

        OLD_ARCHIVE=`date --date $KEEPING_DAYS' days ago' "+%Y_%m_%d"`".tgz.gpg";
        if [ -f $OLD_ARCHIVE ]; then
                log "Deleting old archive "$OLD_ARCHIVE;
                rm $OLD_ARCHIVE;
        fi

        log $FOLDER" folder saved";
done

log "Backup finished successfully";
exit 0;