#!/bin/bash
# Usage: ./server_file_backup.sh $BACKUP_DIR $SAVE_DIR
# Or: curl -s https://git.immiles.com/miles/scripts/raw/master/server_file_backup.sh | bash -s $BACKUP_DIR $SAVE_DIR

#set -ex

# Set Var
BACKUP_DIR=$1
SAVE_DIR=$2
DATE=`date +"%Y%m%d_%H%M%S"`
LOG_FILE=$HOME/logs/file_backup.log
FILE_BASENAME=`echo $BACKUP_DIR | sed 's#/#_#g'`
FILE_BASENAME=${FILE_BASENAME:1}

RETENTION=$((14*24*60))  # 2 weeks
KEEP=7

mkdir -p $HOME/logs

echo "--------------------------$DATE------------------------" >> $LOG_FILE
echo "[BEGIN] Backup [$BACKUP_DIR]" >> $LOG_FILE

# Backup
exclude=( `cat /proc/mounts | awk '{print $2}' | grep -E 'aliyun|google'` )
exclude_options=()
for x in "${exclude[@]}"; do
  exclude_options+=(--exclude="$x")
done

tar_cmd="tar ${exclude_options[@]} --ignore-failed-read -jpcf $SAVE_DIR/$FILE_BASENAME.$DATE.tar.bz2 $BACKUP_DIR >> $LOG_FILE 2>&1"
echo $tar_cmd >> $LOG_FILE

eval $tar_cmd >> $LOG_FILE 2>&1

if [ $? == "0" ];then
    echo "[SUCCESS] Files in [$SAVE_DIR] backup" >> $LOG_FILE
    echo "--------------------------$DATE------------------------" >> $LOG_FILE
else
    echo "[FAIL] Files in [$SAVE_DIR] backup" >> $LOG_FILE
    echo "--------------------------$DATE------------------------" >> $LOG_FILE
    exit 1
fi

# Clean up
find $SAVE_DIR -name "*.tar.bz2" -type f -printf '%T@ %p\n' -mmin +$RETENTION | sort -nr | tail -n +$KEEP | awk '{ print $2 }' | xargs -r rm >> $LOG_FILE 2>&1

exit 0