通过自动的Powershell文件夹侦听器运行Shell脚本

问题描述

在过去的几天里,我一直在使用mcpcmag's articule来整理Powershell脚本,以观察c驱动器上的特定文件夹是否有新文件。当最终用户请求电子邮件时,将创建新文件。新文件是一个.sh文件,其中包含一个cURL命令,该命令会向SendGrid API发送发布请求。

这是下面的powershell脚本:

# Create a listener for our emailOut directory 
$watcher = New-Object System.IO.FileSystemWatcher

# Set the path and turn on the listener 
$watcher.Path = 'C:\emailOut'
$watcher.EnableRaisingEvents = $true

$action =
{
    # set the shellScript to the full path of the added file
    $shellScript = $event.SourceEventArgs.fullPath
    # get the name of the file
    $name = (Get-Item $shellScript).Name
    # set the path which the file will be moved to on completion
    $oldFolderDir = "C:\emailOut\old\" + $name
    
    # run the script
    & $shellScript

    # set the log file path
    $logFile = "C:\emailOut\emailLog_" + $(get-date -format FileDate) + ".txt"

    # set the log message
    $logInfo = $name + " ---> " + $(get-date)

    # add entry to log file
    $logInfo | Out-File $logFile -Append -encoding utf8


    # Move the script file into the historic folder
    Move-Item -Path $shellScript -Destination $oldFolderDir

}

# Start the watcher
Register-ObjectEvent $watcher 'Created' -Action $action

评论使过程相当容易解释,但为了简要描述,这是发生(或应该发生)的事情:

  1. 文件进入正在监视的文件夹
  2. 运行Shell脚本
  3. 条目已添加到日志文件
  4. 文件已移至旧文件夹
  5. 完成

不幸的是,我运行shell脚本的方式似乎有问题。运行该进程时,很明显该脚本正在运行,因为一小段时间出现了一个黑框,但没有发送电子邮件。我已经检查了原始脚本,没有任何问题,因为当我双击.sh文件时,电子邮件将完美发送。

有什么想法吗?

在此先感谢您的帮助或建议。

解决方法

我认为您在这里有一个逻辑问题:

文件进入正在监视的文件夹
[PowerShell] Shell脚本正在运行

问题是在调用Register-ObjectEvent之后,脚本结束,powershell进程终止,这隐式删除了FileSystemWatcher。 您应该始终在想要捕获事件的所有时间运行脚本。

您可以通过计划任务运行它,并使用选项Do not start a new instance (如果有实例在运行),并设置为每N分钟重复一次(以在脚本失败或有人杀死时恢复脚本过程等)。此PowerShell实例必须正在运行才能继续获取事件。

$eventSI = 'CustomSI_FSWCreated'

$watcher = New-Object System.IO.FileSystemWatcher
$watcher.Path = 'S:\SCRIPTS\FileTest'
$watcher.EnableRaisingEvents = $true

$action = { [System.Console]::WriteLine($event.SourceEventArgs.fullPath) }

# Start the watcher
Register-ObjectEvent -InputObject $watcher -EventName 'Created' -Action $action -SourceIdentifier $eventSI | Out-Null
try
{
    $l = 1;
    while($true)    
    {
        # Actually this timeout only sets the frequence of dots on your screen. Set it bigger if you want or remove Write-Host-s
        Wait-Event -Timeout 1 
        Write-Host "." -NoNewline
        $l++;
        if ($l -ge 40) 
        {
            Write-Host ""
            $l = 1;
        }
    }
}
finally
{
    # This executes when you press Ctrl+C
    Unregister-Event -SourceIdentifier $eventSI
    $watcher.EnableRaisingEvents = $false
    $watcher.Dispose()
    Write-Host "Unregistered FSWE"
}
,

只想分享我的最终工作解决方案。 在运行脚本之前,我确实尝试过Start-Sleep -seconds 5,但是很遗憾,这没有达到预期的结果。

经过反复试验,我得出了一个可行的解决方案:

# Create a listener for our emailOut directory 
$watcher = New-Object System.IO.FileSystemWatcher

# Set the path and turn on the listener 
$watcher.Path = 'C:\emailOut'
$watcher.EnableRaisingEvents = $true

$action =
{
   # set the shellScript to the full path of the added file
   $shellScript = $event.SourceEventArgs.fullPath
   # get the name of the file
   $name = (Get-Item $shellScript).Name
   #set the path which the file will be moved to on completion
   $oldFolderDir = "C:\emailOut\old\" + $name

   #### SOLUTION START ###

   #go to where bash.exe is stored
   cd "C:\Program Files\Git\bin"

   # run the script
   & .\bash.exe $shellScript

   ### SOLUTION END ###

   # set the log file path
   $logFile = "C:\emailOut\emailLog_" + $(get-date -format FileDate) + ".txt"

   # set the log message
   $logInfo = $name + " ---> " + $(get-date)

   # add entry to log file
   $logInfo | Out-File $logFile -Append -encoding utf8


   # Move the script file into the historic folder
   Move-Item -Path $shellScript -Destination $oldFolderDir

  }

  # Start the watcher
  Register-ObjectEvent $watcher 'Created' -Action $action

基本上,我通过将cURL脚本传递给git bash.exe来运行脚本。 如有任何其他疑问或问题,请随时与我联系。

帕特里克

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