#!/bin/bash

backup_num=3

function help() {
  echo "-in 源文件路径"
  echo "-out 备份路径"
  echo "-backup_num 备份数量"
  echo "-inKey 使用公钥加密，详情：https://github.com/Rehtt/archive"
  echo "-genKey 生成密钥对，详情：https://github.com/Rehtt/archive"
  exit 0
}

while [ $# -gt 0 ]; do
  case $1 in
  -in)
    in_path="$2"
    shift
    ;;
  -out)
    out="$2"
    shift
    ;;
  -backup_num)
    backup_num=$2
    shift
    ;;
  -inKey)
    inKey="$2"
    shift
    ;;
  -genKey)
    archive -generateRsaKey
    exit 0
    shift
    ;;
  -help)
    help
    ;;
  -h)
    help
    ;;
  esac
  shift
done

if [ x"$in_path" = x ]; then
  help
fi
if [ x"$out" = x ]; then
  help
fi

filename=$(basename "$in_path")
tmp_file="/tmp/$filename-$(date +%Y-%m-%d).tar.xz"
out="$out/$filename"

function get_last_file() {
  local time=1
  del_file=""
  file_num=0
  while [ $# -gt 0 ]; do
    local name=$1
    local name=${name##*/}
    local t=$(echo $name | grep -o '[[:digit:]]\{4,\}-[[:digit:]]\{1,2\}-[[:digit:]]\{1,2\}')
    if [ x"$t" = x ]; then
      shift
      continue
    fi
    local date_str=$(date +%s -d "$t")
    file_num=$(($file_num + 1))
    #    echo $name
    local now=$(date +%s)
    if [[ $(($now - $date_str)) -gt $time ]]; then
      local time=$(($now - $date_str))
      del_file=$name
    fi
    shift
  done
}

#判断是否加密
if [ x"$inKey" = x ]; then
  tar -Jcvf "$tmp_file" "$in_path"
else
  tmp_file=$tmp_file.d
  if [ x"$(which archive)" = x ]; then
    echo "缺少archive"
    help
  fi
  archive -a -e -inKey "$inKey" -in "$in_path" -out "$tmp_file"
fi

# 判断是本地保存还是用rclone保存
if [[ $(echo "$out" | grep ":") != "" ]]; then
  if [ x"$(which rclone)" = x ]; then
    echo "缺少rclone"
    help
  fi
  rclone mkdir "$out"
  list=$(rclone ls "$out")
  get_last_file $list
  while [ $file_num -ge $backup_num ]; do
    rclone delete "$out/$del_file"
    list=$(rclone ls "$out")
    get_last_file $list
  done
  rclone copy "$tmp_file" "$out"
else
  mkdir -p "$out"
  list=$(ls "$out")
  get_last_file $list
  while [ $file_num -ge $backup_num ]; do
    rm -f "$out/$del_file"
    list=$(ls "$out")
    get_last_file $list
  done
  cp "$tmp_file" "$out"
fi
rm -f "$tmp_file"
Last modification：October 26, 2022
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