php如何实现更新功能

/**
 * 升级包规定的目录结构
 * xxx_版本号.zip(如：xxx_1.0.0.zip)
 * |
 * |————mysql
 * | |
 * | |___mysql_update.sql(更新脚本)
 * | |___mysql_rockback.sql（回滚脚本）
 * | 
 * |____php
 * 
*/

create table test(id init(11));
create table test2(id init(11));
mysql_rockback.sql
drop table test;
drop table test2;
4.代码
class UpgradeSys{
 public $update_log = "/tmp/web/update_log.log"; //系统升级日志
 public $return_log = "/tmp/web/return_log.log"; //系统回滚日志
 public $progress_log = "/tmp/web/progress_log.log"; //记录进度
 public $root_dir = "/Users/feng/Documents/work/test"; //站点代码的根目录
 public $aFile = ["log","runtime"];//忽略文件夹相对路径
 public $backup_dir = "/tmp/web/backup_dir";//备份目录
 public $upload_dir = "/tmp/web/upload_dir";//升级包目录
 public $sys_version_num = '1.0.0';//当前系统的版本 这个在实际应用中应该是虫数据库获取得到的，这里只是举个例子
 /** 展示升级界面 */
 public function index()
 {
 include("update.html");
 }
 /**
 * 处理升级包上传
 */
 public function upload()
 {
 $params = $_POST;
 if($_FILES)
 {
 $name = $_FILES['file']['tmp_name'];
 if(!$name || !is_uploaded_file($name))
 {
 echo json_encode(["status"=>0,"msg"=>"请上传升级包文件"]);
 die;
 }
 }
 //校验后缀
 $astr = explode('.',$name);
 $ext = array_pop($astr);
 if($ext != 'zip')
 {
 echo json_encode(["status"=>0,"msg"=>"请上传文件格式不对"]);
 die;
 }
 //校验升级密码
 // if(!isset($params['password']) || $params['password'] != $this->password)
 // {
 // echo json_encode(["status"=>0,"msg"=>"密码错误"]);
 // die;
 // }
 //对比版本号
 $astr = explode('_',$name);
 $version_num = str_replace(".zip", '',array_pop($astr));
 if(!$version_num)
 {
 echo json_encode(["status"=>0,"msg"=>"获取版本号失败"]);
 die;
 }
 //对比
 if(!$this->compare_version($version_num))
 {
 echo json_encode(["status"=>0,"msg"=>"不能升级低版本的"]);
 die;
 }
 $package_name = $this->upload_dir.'/'.$version_num.'.zip';
 if(!move_uploaded_file($name,$package_name))
 {
 echo json_encode(["status"=>0,"msg"=>"上传文件失败"]);
 die;
 }
 //记录下日志
 $this->save_log("上传升级包成功！");
 $this->update_progress("20%");
 //备份code
 $result = $this->backup_code();
 if(!$result)
 {
 $this->save_log("备份失败！");
 echo json_encode(["status"=>0,"msg"=>"备份失败"]);
 die;
 }
 $this->update_progress("30%");
 //执行升级
 $this->execute_update($package_name);
 }
 /**
 * 升级操作
 * @return [type] [description]
 */
 private function execute_update($package_name)
 {
 //解压 如何使用zip加密压缩，这里解压缩的时候注意要解密
 exec(" cd $upload_dir && unzip $package_name ");
 $package_name = str_replace(".zip","",$package_name);
 if(!is_dir($package_name))
 {
 $this->save_log("解压失败");
 echo json_encode(["status"=>0,"msg"=>"解压失败"]);
 die;
 }
 $this->update_progress("50%");
 //升级mysql
 if(file_exists($this->upload_dir.'/'.$package_name."/mysql/mysql_update.sql"))
 {
 $result = $this->database_operation($this->upload_dir.'/'.$package_name."/mysql/mysql_update.sql");
 if(!$result['status'])
 {
 echo json_encode($result);die;
 }
 }
 $this->update_progress("70%");
 //升级PHP
 if(is_dir($this->upload_dir.'/'.$package_name.'/php'))
 {
 exec("cd {$this->upload_dir}/{$package_name}/php && cp -rf ./* $this->root_dir ",$mdata,$status);
 if($status != 0 )
 {
 $this->save_log("php更新失败");
 //数据库回滚
 if(file_exists($this->upload_dir.'/'.$package_name."/mysql/mysql_rockback.sql"))
 {
 $this->save_log("数据库回滚");
 $this->database_operation($this->upload_dir.'/'.$package_name."/mysql/mysql_rockback.sql");
 
 }
 //php代码回滚
 $cmd = "cp -rf " .$this->backup_dir."/".$this->sys_version_num.'/'.basename($this->root_dir)."/* ".$this->root_dir;
 exec($cmd,$mdata,$status);
 $this->save_log("php回滚");
 echo json_encode(["status"=>0,"msg"=>"php更新失败"]);
 die;
 }
 }
 //把解压的升级包清除
 exec("rm -rf $upload_dir/$package_name ");
 
 $this->update_progress("100%");
 //更新系统的版本号了
 //更新php的版本号了(应该跟svn／git的版本号一致)
 //更新数据库的版本号了(应该跟svn／git的版本号一致)
 echo json_encode(["status"=>1,"msg"=>"升级成功"]);
 die;
 }
 /**
 * 比较代码版本
 * @return [type] [description]
 */
 private function compare_version($version_num='1.0.0')
 {
 
 return version_compare($version_num,$this->sys_version_num,'>');
 }
 /**
 * 备份代码
 */
 private function backup_code()
 {
 //rsync 要确定系统是否已经安装
 $cmd = "cd $root_dir && cd .. && rsync -av ";
 foreach ($this->aFile as $key => $value) {
 $cmd ."--exclude ". basename($this->root_dir) ."/".$value ." ";
 }
 $cmd .= basename($this->root_dir)." ".$this->backup_dir."/".$this->sys_version_num;
 exec($cmd,$mdata,$status);
 if($status != 0)
 {
 return false;
 }
 //这里还可以对备份的文件进行压缩
 return true;
 }
 /**
 * 数据库操作
 */
 public function database_operation($file)
 {
 $mysqli = new mysqli("localhost","root","root","test");
 if($mysqli->connect_errno)
 {
 return ["status"=>0,"msg"=>"Connect failed:".$mysqli->connect_error];
 }
 $sql = file_get_contents($file);
 $a = $mysqli->multi_query($sql);
 return ["status"=>1,"msg"=>"数据库操作OK"];
 }
 /**
 * 返回系统升级的进度
 */
 public function update_progress($progress)
 {
 exec(" echo '".$progress."' > $this->progress_log ");
 }
 /**
 * 记录日志
 */
 public function save_log($msg,$action="update")
 {
 $msg .= date("Y-m-d H:i:s").":".$msg."
";
 if($action == "update")
 {
 exec(" echo '".$msg."' >> $this->update_log ");
 }else
 {
 exec(" echo '".$msg."' >> $this->return_log ");
 }
 }
}