Azure Pipelines：在 Powershell 中设置和访问变量

Question

在 Azure 管道中，我有一个 Powershell 任务（内联脚本），我在其中设置了一个变量

Write-Host "##vso[task.setvariable variable=deployActivity]false"

紧接着这一行，只是为了检查设置变量的目的，我有以下 powershell -

if ($(deployActivity) -eq $true) {
    Write-Host "deployActivity=true (bool)"
}

但是，这失败并出现错误：

deployActivity : The term 'deployActivity' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

问题-

1. 在上面做什么来检索变量 - 是否正确/可能？还是说一个变量只能在后续任务中引用
2. 为什么会失败？ Powershell中变量的引用是否需要其他语法？

请告诉我。

谢谢

Answer 1

根据该命令的documentation：

在taskcontext的变量服务中设置一个变量。第一个任务 可以设置一个变量，后面的任务都可以使用这个变量。 该变量作为环境暴露给以下任务 变量。

它仅在设置它之后的任务中可用。如果您需要在同一个脚本中引用该值，您应该已经知道内部变量应该是什么。

这个示例 YML 适合我：

# Starter pipeline
# Start with a minimal pipeline that you can customize to build and deploy your code.
# Add steps that build, run tests, deploy, and more:
# https://aka.ms/yaml

trigger:
- master

pool:
  vmImage: 'windows-2019'

steps:

    
- task: PowerShell@2
  inputs:
    targetType: 'inline'
    script: 'Write-Host "##vso[task.setvariable variable=deployActivity]"Example string""'

- task: PowerShell@2
  inputs:
    targetType: 'inline'
    script: 'Write-Host "Deploy Activity: $(deployActivity)"'

第二个任务的输出：

Starting: PowerShell
==============================================================================
Task         : PowerShell
Description  : Run a PowerShell script on Linux, macOS, or Windows
Version      : 2.170.1
Author       : Microsoft Corporation
Help         : https://docs.microsoft.com/azure/devops/pipelines/tasks/utility/powershell
==============================================================================
Generating script.
========================== Starting Command Output ===========================
"C:\windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoLogo -NoProfile -NonInteractive -ExecutionPolicy Unrestricted -Command ". 'D:\a\_temp\3a04683f-6159-4bee-862b-2e899e977789.ps1'"
Deploy Activity:  Example string
Finishing: PowerShell

Answer 2

尝试用"" - "$(deployActivity)"包装变量：

if ("$(deployActivity)" -eq $true) {
    Write-Host "deployActivity=true (bool)"
}