#!/bin/sh
# PostgreSQL 自动备份脚本

set -e

BACKUP_DIR="/backups"
DATE=$(date +%Y%m%d_%H%M%S)
BACKUP_FILE="$BACKUP_DIR/backup_$DATE.sql.gz"

echo "开始备份 PostgreSQL 数据库：$DATE"

# 创建备份目录
mkdir -p $BACKUP_DIR

# 执行备份
PGPASSWORD=$POSTGRES_PASSWORD pg_dump \
  -h $POSTGRES_HOST \
  -U $POSTGRES_USER \
  -d $POSTGRES_DB \
  --no-owner \
  --no-acl \
  | gzip > $BACKUP_FILE

# 检查备份是否成功
if [ -f "$BACKUP_FILE" ]; then
  BACKUP_SIZE=$(du -h "$BACKUP_FILE" | cut -f1)
  echo "备份完成：$BACKUP_FILE (大小: $BACKUP_SIZE)"
else
  echo "备份失败！"
  exit 1
fi

# 删除 30 天前的备份
find $BACKUP_DIR -name "backup_*.sql.gz" -mtime +30 -delete
echo "已清理 30 天前的备份文件"

echo "备份任务完成"