#!/bin/bash

s3cmd=/home/iet/bin/s3cmd

BACKUP_PATHS=""
CLONE_PATH=""
STORE_PATH=""
REMOTE_S3_PATH=""
BACKUP_NAME="some-account"
STORE_DAILY_REMOTE=7
STORE_WEEKLY_REMOTE=5

STORE_DAILY_LOCAL=30
STORE_WEEKLY_LOCAL=30

cfg="$0.cfg"
. $cfg

check_config()
{
    if [  "$BACKUP_PATHS" == "" ] || [ "$CLONE_PATH" == "" ] || [ "$STORE_PATH" == "" ] || [ "$REMOTE_S3_PATH" == "" ]; then
        echo "Invalid config in '$cfg'"
        exit 1
    fi
}

log()
{
    d=$(date +"%Y-%m-%d %H:%M:%S")
    echo "$d - $*"
}

getFilesToDelete()
{
    keep=0
    files=$1
    keepCount=$2
    for f in $files ; do
        ((keep++))
        if (( $keep > $keepCount )); then
            echo $f
        fi
    done
}

check_config

mkdir -p $CLONE_PATH
mkdir -p $STORE_PATH

for p in $BACKUP_PATHS; do
    echo "rsync item '$p'"
    rsync -av $p $CLONE_PATH
done
log Creating snapshot archive 

date=$(date +%Y-%m-%d)

weekly_day=7
weekly=""
if [ "$(date +%u)" == "$weekly_day" ]; then
    weekly=$(date +%U)
    weekly="-week-$weekly"
fi

day="$date$weekly"

dstfile="$day-$BACKUP_NAME.tar.gz"
dstfilepath=$STORE_PATH/$dstfile

filesLocalDaily=$(ls -1 $STORE_PATH | grep -v "\-week\-" | sort -nr)
filesLocalWeekly=$(ls -1 $STORE_PATH | grep "\-week\-" | sort -nr)

filesDelLocal=$(
getFilesToDelete "$filesLocalDaily" $STORE_DAILY_LOCAL
getFilesToDelete "$filesLocalWeekly" $STORE_WEEKLY_LOCAL
)

for f in $filesDelLocal; do
    fp=$STORE_PATH/$f
    echo "removing $fp"
    rm -f $fp
done

log Compressing files
cd $CLONE_PATH
#tar -czf $dstfilepath ./*
tar -czf $dstfilepath .


log Uploading to S3


filesRemoteDaily=$($s3cmd ls $REMOTE_S3_PATH | awk '{print $4}' | grep -v "\-week\-" | sort -nr)
filesRemoteWeekly=$($s3cmd ls $REMOTE_S3_PATH | awk '{print $4}' | grep "\-week\-" | sort -nr)

filesDelRemote=$(
getFilesToDelete "$filesRemoteDaily" $STORE_DAILY_REMOTE
getFilesToDelete "$filesRemoteWeekly" $STORE_WEEKLY_REMOTE
)

for f in $filesDelRemote; do
    echo "removing $f"
    $s3cmd del $f
done

$s3cmd put $dstfilepath $REMOTE_S3_PATH/$dstfile

log Backup finished