Backup Modelbrouwers

run_backup.sh

#!/bin/env bash

#
# Adapted from http://webgnuru.com/linux/rsync_incremental.php
#

USER='modelbrouw'
HOST='modelbrouwers.nl'
DAYS_BETWEEN_FULL=30  # number of days between full backups.

TARGET_SUFFIX="media"
TARGET_BASE="/run/media/bbt/40d67de8-f4b6-4707-9947-f96f44efd7bf/"
SOURCE="/home/modelbrouw/django/production/$TARGET_SUFFIX"


today=`date -I`
prev_day=$today  # check if backup from today exists


get_target() {
    root_dir=$TARGET_BASE$1
    if [[ $2 ]]; then
        root_dir=$root_dir/$2
    fi
    echo $root_dir
}


LOG=`get_target $today 'rsync_inc.log'`

# do the date calculations
# determine if a full/incremental backup should be taken
run_backup() {
    i=0
    PREV_BACKUP=`get_target $prev_day`

    while [ $i -lt 100 ] && [ ! -d $PREV_BACKUP ]
    do
        i=$[i+1]
        prev_day=`date -I -d "$i day ago"`
        PREV_BACKUP=`get_target $prev_day`
    done

    if [ $i -eq '0' ]; then
        echo "Backup already created"
        # exit
    else
        echo $i 'days since last backup'
    fi

    # create the target directory
    TARGET=`get_target $today`
    echo -e 'Backup target:' $TARGET "\n"
    mkdir -p $TARGET

    if [ $i -lt $DAYS_BETWEEN_FULL ]; then
        echo -e "creating incremental backup, based on" $prev_day "\n"
        incremental_backup
    else
        echo -e "creating full backup \n"
        source ./backup.sh
    fi
}


incremental_backup() {
    DEST=`get_target $today $TARGET_SUFFIX`
    COMP=`get_target $prev_day $TARGET_SUFFIX`
    echo 'remote source directory:' $SOURCE
    echo 'backup destination:' $DEST

    SSH="-e ssh $USER@$HOST:$SOURCE/"
    OPT="-rvLtShP"

    echo $LOG
    rsync $OPT --link-dest=$COMP $SSH $TARGET/$TARGET_SUFFIX > $LOG
}

run_backup