![执行 Start-Process 后,Powershell“忘记”访问 UNC 路径](https://linux22.com/image/1620247/%E6%89%A7%E8%A1%8C%20Start-Process%20%E5%90%8E%EF%BC%8CPowershell%E2%80%9C%E5%BF%98%E8%AE%B0%E2%80%9D%E8%AE%BF%E9%97%AE%20UNC%20%E8%B7%AF%E5%BE%84.png)
我的 powershell 脚本中有一个非常奇怪的行为:
$env:SEE_MASK_NOZONECHECKS = 1
$path = "FileSystem::\\some_server\share\Build-Agent-Tools"
# If $path would be a local path, the very last line (UNC access) would never fail
$runtime = "$path\dotnet-runtime-2.2.8-win-x64.exe"
$res = Start-Process -Wait -FilePath $runtime -ArgumentList "/install /passive /norestart" -PassThru
@(Get-ChildItem -Path $path ) # This says $path not found, what?!!
我的做法:我从给定的 UNC 路径中选择一个 dotnet-runtime 安装程序并将其安装在我的机器上。然后,我在选择的运行时可执行文件的同一 UNC 路径上执行 Get-ChildItem,然后出现此错误:
Get-ChildItem : Cannot find path '\\some_server\share\Build-Agent-Tools' because it does not exist.
At D:\Untitled1.ps1:11 char:3
+ @(Get-ChildItem -Path $path ) # This says $path not found, what?!!
+ ~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (\\some_server\share\Build-Agent-Tools:String) [Get-ChildItem], ItemNotFoundException
+ FullyQualifiedErrorId : PathNotFound,Microsoft.PowerShell.Commands.GetChildItemCommand
其他可执行文件不会产生此类问题。此外,从非 UNC路径,然后Get-ChildItem
在同一路径上执行上面相同的代码就可以了。
在这种情况下会发生什么?
我还发现插入Start-Sleep 5
后 Start-Process
在失败Get-ChildItem
之前有时帮助。有时 5 秒失败,有时 10 秒有效。
这可能是什么问题?
答案1
嗯,这不是一个完整的解决方案,但我添加了一个辅助方法,可以等待路径准备就绪
function Wait-For-Path-Ready($path) {
echo "Waiting for '$path' be ready"
$tries = 100
$waitInMs = 100
$success = $false
for ($i = 0; $i -le $tries; ++$i) {
try {
Get-ChildItem $path -ErrorAction Stop | Out-Null
$success = $true
break;
}
catch {
echo "Path not ready, retrying"
Start-Sleep -Milliseconds $waitInMs
}
}
if( $success )
{
echo "Path is ready"
}
else {
throw "$path failed to become ready after $($tries*$waitInMs / 1000) seconds"
}
}
用法:
Wait-For-Path-Ready "somepath`