我有一个詹金斯（Jenkins）职位，该职位的升职可以运行Powershell脚本。

升级过程操作是Windows PowerShell：

& "\\myserver\mypath\$ENV:BUILD_NUMber\\deployStuff.ps1" -environment "Dev"

脚本的开头：

param (
    [Parameter(Mandatory=$true)][string]$Environment
)

Write-Host "Deploy  - Environment = $Environment"
$root = (Get-Item $PSScriptRoot)
Write-Host "root = $root"

没有什么非常令人兴奋的。除了当我选中“限制此升级过程的运行位置”并指定我的一个从属设备之外，它可以工作，并且如果我取消选中它，或者指定我在主服务器上运行它，则会得到异常：

Started by user jdege
Building on master in workspace E:\jenkins_home\jobs\Promote Development Branch\workspace
Promoting Promote Development Branch #18
[workspace] $ powershell.exe -NonInteractive -ExecutionPolicy ByPass "& 'C:\Users\KORCOM~1\AppData\Local\Temp\hudson2695983892011285716.ps1'"
Deploy - Environment = Dev
Get-Item : Cannot bind argument to parameter 'Path' because it is null.
At \\myserver\mypath\$ENV:BUILD_NUMber\\deployStuff.ps1:6 char:18
+ $root = (Get-Item <<<<  $PSScriptRoot)
    + CategoryInfo          : InvalidData: (:) [Get-Item],ParameterBindingValidationException
    + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,microsoft.PowerShell. 
   Commands.GetItemCommand

这为什么在从属设备上起作用，而在主设备上却不起作用？

Mathias建议我尝试$ Myinvocation.PSScriptRoot。

我更改的脚本：

param (
    [Parameter(Mandatory=$true)][string]$Environment
)

$root = Get-Item $PSScriptRoot
Write-Host "root - $root"
$root2 = Get-Item $Myinvocation.PSScriptRoot
Write-Host "root2 - $root2"

我的输出：

Started by user jdege
Building on master in workspace E:\jenkins_home\jobs\Promote Development Branch\workspace
Promoting Promote Development Branch #25
[workspace] $ powershell.exe -NonInteractive -ExecutionPolicy ByPass "& 'C:\Users\KORCOM~1\AppData\Local\Temp\hudson1494277122445286804.ps1'"
try PSScriptRoot
Get-Item : Cannot bind argument to parameter 'Path' because it is null.
At \\ch-vmfile1\PublishedBuilds\kt_everything\development\8\deploy_bats\deploy_bats\deployMigrator.
ps1:6 char:17
+ $root = Get-Item <<<<  $PSScriptRoot
    + CategoryInfo          : InvalidData: (:) [Get-Item],microsoft.PowerShell. 
   Commands.GetItemCommand

root - 
try Myinvocation.PSScriptRoot
root2 - 
Get-Item : Cannot bind argument to parameter 'Path' because it is null.
At \\ch-vmfile1\PublishedBuilds\kt_everything\development\8\deploy_bats\deploy_bats\deployMigrator.
ps1:18 char:20
+ $parent = (Get-Item <<<<  $PSScriptRoot).parent.parent.FullName
    + CategoryInfo          : InvalidData: (:) [Get-Item],microsoft.PowerShell. 
   Commands.GetItemCommand

Get-Item : Cannot bind argument to parameter 'Path' because it is null.
At \\ch-vmfile1\PublishedBuilds\kt_everything\development\8\deploy_bats\deploy_bats\deployMigrator.
ps1:33 char:29
+ . (Join-Path -Path (Get-Item <<<<  $PSScriptRoot) -ChildPath deployFunctions.ps1)
    + CategoryInfo          : InvalidData: (:) [Get-Item],microsoft.PowerShell. 
   Commands.GetItemCommand

换句话说，我看到的与$ PSScriptRoot相同的$ Myinvocation.PSScriptRoot错误。