如何解决通过自动的Powershell文件夹侦听器运行Shell脚本
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:
- 文件进入正在监视的文件夹
- 运行Shell脚本
- 条目已添加到日志文件
- 文件已移至旧文件夹
- 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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