PowerShell从脚本运行脚本：如果调用失败，则调用者失败

Question

我有./main.ps1用参数（来自main.ps1的行）调用./worker1.ps1和worker2.ps1：

# other stuff in main script
$args = @()
$args += ("-PARAM1", "$VAR1")
$args += ("-PARAM2", "$VAR2")
$worker1 = "./workers/worker1.ps1"
Invoke-Expression "$worker1 $args" -ErrorAction Stop
# other stuff in main script
$worker2 = "./workers/worker2.ps1"
Invoke-Expression "$worker2 $args" -ErrorAction Stop

如果worker1.ps1失败，则有exit 1行，
问题在于，即使worker1.ps1失败，worker2.ps1也会调用main.ps1

如何避免这种情况并在其中一个调用失败后立即使主脚本失败？

Answer 1

• 按照Theo的建议，避免使用$args作为自定义变量，因为它是由PowerShell本身管理的所谓的automatic variable。

  < / li>

• Invoke-Expression should generally be avoided;肯定是don't use it to invoke an external program or PowerShell script。

• 使用hash table而不是 array 在数据结构中表达参数，然后使用splatting传递它。

• 如果脚本使用带有非零参数的exit来指示失败，请查询自动$LASTEXITCODE变量以推断失败。

将它们放在一起：

# other stuff in main script

# Define the arguments as a *hashtable*.
$htArgs = @{
  PARAM1 = $VAR1
  PARAM2 = $VAR2
}

foreach ($worker in './workers/worker1.ps1', './workers/worker2.ps1') {
  & $worker @htArgs # Note the @ sigil for splatting
  if ($LASTEXITCODE) { Throw "$worker signaled failure via exit code $LASTEXITCODE" } 
}

Answer 2

由于我没有要处理的程序，因此我创建了一对夫妇来复制我以为你在说的话，例如失败时，Worker1.ps1返回1。

所以主程序看起来像这样：

$TFArgs = @{ReturnCD = 0
            CallNumber = 1}


$RVal = & .\test\Test-CallFail.ps1 @TFArgs 
$RVal
Write-Host " "

If ($RVal -ne 1) {
       $TFArgs = @{ReturnCD = 1
                   CallNumber = 2}
  $RVal = & .\test\Test-CallFail.ps1 @TFArgs
  $Rval
}  

被调用程序如下：

Param (
  [INt] $ReturnCd,
  [Int] $CallNumber
)

Write-Host "Call Number: $CallNumber"
"$ReturnCd"

因此，如果第一个调用的ReturnCD为0，即成功，输出将如下所示：

Call Number: 1
0

Call Number: 2
1

如果将ReturnCD更改为1，即失败，则它看起来像这样：

Call Number: 1
1

第二个电话没有拨打。

HTH

Answer 3

$ Result =调用表达式“ $ worker1 $ args” -ErrorAction Stop

主脚本中的其他内容

如果（$ Result） { $ worker2 =“ ./workers/worker2.ps1” 调用表达式“ $ worker2 $ args” -ErrorAction Stop }

Answer 4

经过几次尝试，我发现了简单的方法：

# other stuff in main script
& ./workers/worker1.ps1 -PARAM1 "$VAR1" -PARAM2 "$VAR2"
if ($LASTEXITCODE -ne 0) {
    Write-Output "worker1 has failed"
    exit 1
} else {
    Write-Output "worker1 has completed"
}
# other stuff in main script
& ./workers/worker2.ps1