#! /bin/bash

function init {
echo "Backify is starting, looking for configuration file..." >&2

config='backup.cfg'
config_secured='sbackup.cfg'

if [ ! -f "$config" ] 
    then
    echo "Error: Config file not found: $config" >&2
    echo "Please create a config file or specify the location of an existing file." >&2
    exit 1
fi

if grep -E -q -v '^#|^[^ ]*=[^;]*' "$config"; then
  echo "Config file is unclean, cleaning it..." >&2
  grep -E '^#|^[^ ]*=[^;&]*'  "$config" > "$config_secured"
  config="$config_secured"
fi

source "$config"

echo "Configuration file loaded" >&2

if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi
}

function system {

  if [ -f /etc/redhat-release ] 
  then
    echo "Discovered Red Hat-based OS..."
    system='rhel'
  elif [ -f /etc/lsb-release ] 
  then
    echo "Discovered Ubuntu-based OS..."
    system='ubuntu'
  else
    echo "Error: Unable to detect OS type."
    exit 1
  fi

echo "Discovered $system based OS..." >&2
}

function makedir {
timestamp=$(date +%Y%m%d_%H%M)
mkdir /tmp/backify-$timestamp
tmpdir="/tmp/backify-$timestamp"
}

function wwwbackup {
if [ "$www_backup" = true ]
then 
    echo "Backing up wwwroot..." >&2
    mkdir -p $tmpdir/wwwdata
    cp -r $www_dir/ $tmpdir/wwwdata/
    echo "Finished" >&2
fi
}

function vhostbackup {
if [ "$vhost_backup" = true ]
then 
    echo "Backing up vhosts..." >&2
    mkdir -p $tmpdir/vhosts
    cp -r $vhost_dir/ $tmpdir/vhosts/
    echo "Finished" >&2
fi
}

function logbackupcentos {
if [ "$log_backup" = true ]
then 
    echo "Backing up system logs..." >&2
    mkdir -p $tmpdir/syslogs
    cp /var/log/syslog $tmpdir/syslogs/
    cp /var/log/message $tmpdir/syslogs/

    if [ "$fail2ban_log" = true ]
    then
        cp /var/log/fail2ban.log $tmpdir/syslogs/
    fi

    if [ "$log_backup_web" = true]
    then
        if [ "$apache" = true ]
        then
            mkdir -p $tmpdir/apachelogs
            cp -r /var/log/httpd $tmpdir/apachelogs
        fi
        if [ "$nginx" = true ]
        then
            mkdir -p $tmpdir/nginxlogs
            cp -r /var/log/nginx $tmpdir/nginxlogs
        fi
    fi

    if [ "$log_purge" = true]
    then
        echo "Purging logs..." >&2
        truncate -s 0 /var/log/syslog 
        truncate -s 0 /var/log/message
        if [ "$apache" = true ]
        then
            truncate -s 0 /var/log/httpd/*
            rm /var/log/httpd/*.gz
        fi
        if [ "$nginx" = true ]
        then
            truncate -s 0 /var/log/nginx/*
            rm /var/log/nginx/*.gz
        fi
        if [ "$fail2ban_log" = true ]
        then
            truncate -s 0 /var/log/fail2ban.log
        fi
    fi
    echo "Finished" >&2
fi
}

function logbackupubuntu {
if [ "$log_backup" = true ]
then 
    echo "Backing up system logs..." >&2
    mkdir -p $tmpdir/syslogs
    cp /var/log/syslog $tmpdir/syslogs/
    cp /var/log/message $tmpdir/syslogs/

    if [ "$fail2ban_log" = true ]
    then
        cp /var/log/fail2ban.log $tmpdir/syslogs/
    fi

    if [ "$log_backup_web" = true]
    then
        if [ "$apache" = true ]
        then
            mkdir -p $tmpdir/apachelogs
            cp -r /var/log/apache2 $tmpdir/apachelogs
        fi
        if [ "$nginx" = true ]
        then
            mkdir -p $tmpdir/nginxlogs
            cp -r /var/log/nginx $tmpdir/nginxlogs
        fi
    fi

    if [ "$log_purge" = true]
    then
        echo "Purging logs..." >&2
        truncate -s 0 /var/log/syslog 
        truncate -s 0 /var/log/message
        if [ "$apache" = true ]
        then
            truncate -s 0 /var/log/apache2/*
            rm /var/log/apache2/*.gz
        fi
        if [ "$nginx" = true ]
        then
            truncate -s 0 /var/log/nginx/*
            rm /var/log/nginx/*.gz
        fi
        if [ "$fail2ban_log" = true ]
        then
            truncate -s 0 /var/log/fail2ban.log
        fi
    fi
    echo "Finished" >&2
fi
}

function push {
    if [ "$rsync_push" = true ]
    then
        #Push - Dockerized
        if [ "push_clean" = true ]
        then
            rm /opt/backify-$timestamp.tar.gz
        fi
    fi
}

function dockerbackup {
    if [ "$docker_enabled" = true]
    then
        if [ "$docker_images" = true]
        then
            echo "Backing up Docker images..." >&2
            for i in `docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/`
            do container_name=$i
            echo -n "$container_name - "
            container_image=`docker inspect --format='{{.Config.Image}}' $container_name`
            mkdir -p $tmpdir/containers/$container_name
            save_dir="$tmpdir/containers/$container_name/$container_name-image.tar"
            docker save -o $save_dir $container_image
            echo "Finished" >&2
            done
        fi
        if [ "$docker_volumes" = true ]
        then
            echo "Backing up Docker volumes..." >&2
            for i in `docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/`
            do container_name=$i
            mkdir -p $tmpdir/containers/$container_name
            echo -n "$container_name - "
	        docker run --rm --userns=host \
  	        --volumes-from $container_name \
  	        -v $backup_path:/backup \
  	        -e TAR_OPTS="$tar_opts" \
  	        piscue/docker-backup \
            backup "$tmpdir/containers/$container_name/$container_name-volume.tar.xz"
	        echo "Finished" >&2
            done
        fi    
        if [ "$docker_data" = true ]
        then
            echo "Backing up container information..." >&2
            for i in `docker inspect --format='{{.Name}}' $(docker ps -q) | cut -f2 -d\/`
            do container_name=$i
            echo -n "$container_name - "
            container_data=`docker inspect $container_name`
            mkdir -p $tmpdir/containers/$container_name
            echo $container_data > $tmpdir/containers/$container_name/$container_name-data.txt
            echo "Finished" >&2
            done
        fi
    fi
}

function runbackup {
    # init, config check
    init
    # run system detection
    system
    if [ "$enabled" = true ]
    then
        # step 1 : create directory
        makedir
        # step 2 : www backup
        wwwbackup
        # step 3 : vhost backup
        vhostbackup
        # step 4: log backup
        if [ $system = "rhel" ]
        then
            logbackuprhel
        fi
        if [ $system = "ubuntu" ]
        then
            logbackupubuntu
        fi
        # step 5: docker backup
        dockerbackup
        # archive data
        echo "Creating backup archive..." >&2
        tar -czvf /opt/backify-$timestamp.tar.gz $tmpdir
        # push data to server
        push
        echo "Voila, enjoy the rest of the day" >&2
    else
        echo "Backup is disabled in the configuration" >&2
    fi
}

runbackup