#!/bin/bash
 
# 设置数据库配置
USER="root"
PASSWORD="pass"
DEFAULTS_FILE="/etc/my.cnf"  # 指定你的配置文件
#DATADIR="/var/lib/mysql"
BASE_BACKUP_DIR="/www/embk/xtr"
SOCKET_FILE="/tmp/mysql.sock"
 
# 获取当前日期
CURRENT_DATE=$(date +%Y-%m-%d)
FULL_BACKUP_DIR="$BASE_BACKUP_DIR/full_$CURRENT_DATE"
FULL_BACKUP_LOG="$BASE_BACKUP_DIR/log_full_$CURRENT_DATE.log"
INCREMENTAL_BACKUP_DIR="$BASE_BACKUP_DIR/incremental_$CURRENT_DATE"
INCREMENTAL_BACKUP_LOG="$BASE_BACKUP_DIR/log_incremental_$CURRENT_DATE.log"

## check directory has exists
if [ -e $FULL_BACKUP_DIR ]; then
    echo $FULL_BACKUP_DIR"exists!"
else
    mkdir -p $FULL_BACKUP_DIR
fi

if [ ! -e $INCREMENTAL_BACKUP_DIR ];then
    mkdir -p $INCREMENTAL_BACKUP_DIR
fi


 
# 检查是否为周日
if [ "$(date +%u)" -eq 7 ]; then
    # 周日进行全量备份
    echo "Starting full backup..."
    xtrabackup --defaults-file="$DEFAULTS_FILE" --backup --target-dir="$FULL_BACKUP_DIR" --user="$USER" --password="$PASSWORD" --socket="$SOCKET_FILE" --compress --compress-threads=2 > "$FULL_BACKUP_LOG" 2>&1
    echo "Full backup completed."
else
    # 其他天进行增量备份
    LAST_FULL_DIR=$(ls -d "$BASE_BACKUP_DIR/full_"* | sort | tail -n 1)
    LAST_INCREMENTAL_DIR=$(ls -d "$BASE_BACKUP_DIR/incremental_"* | sort | tail -n 1)
 
    if [ -z "$LAST_FULL_DIR" ]; then
        echo "No previous full backup found. Exiting."
        exit 1
    fi
 
    if [ -z "$LAST_INCREMENTAL_DIR" ]; then
        echo "No previous incremental backup found. Using the last full backup for the base."
        LAST_INCREMENTAL_DIR="$LAST_FULL_DIR"
    fi
 
    echo "Starting incremental backup based on $LAST_INCREMENTAL_DIR..."
    xtrabackup --defaults-file="$DEFAULTS_FILE"  --backup --no-lock --target-dir="$INCREMENTAL_BACKUP_DIR" --incremental-basedir="$LAST_INCREMENTAL_DIR"  --user="$USER" --password="$PASSWORD" --socket="$SOCKET_FILE"  --compress > "$INCREMENTAL_BACKUP_LOG" 2>&1
    echo "Incremental backup completed."
fi