azure - If/Else 逻辑和自定义变量

Question

我正在尝试运行一些 if / else我的管道中的逻辑使用 expressions .

trigger:
  - dev
  - qa
  - main
  - test/*

resources:
  - repo: self

variables:
  vmImageName: 'ubuntu-latest'
  # We get rid off the 'refs/heads/' to isolate the branch name and deduce the environment we're running on.
  # If running on 'main' branch, env value will be 'prod'.
  env: $[replace(replace(variables['Build.SourceBranchName'], 'main', 'prod'), 'refs/heads/', '')]

stages:
  - stage: Build
    displayName: Build stage
    jobs:
      - job: Build
        displayName: Build
        pool:
          vmImage: $(vmImageName)
        steps:
          - script: | # this below block works as expected            
              if [[ $(env) == "dev" ]] ; then
                echo "dev"
              elif [[ $(env) == "qa" ]] ; then
                echo "qa"
              elif [[ $(env) == "prod" ]] ; then
                echo "prod"
              else 
                echo "We are running on an unmanaged branch"
              fi
            displayName: Test 1        
          - script: echo "Deploying to $(env)"
            ${{ if in(variables['env'], 'prod', 'qa', 'dev') }}:
              displayName:  Deploy to a managed environment # we never get there
            ${{ else }}:
              displayName: Deploy to an unmanaged environment # always here

我已经尝试了 variables['env']和variables.env语法为 stated here但运气不好了。

知道为什么我的实现不起作用吗？我想我可以使用系统的variables['Build.SourceBranchName']进入那个if/else声明，但我想了解我的代码有什么问题。

Answer 1

因为 $[replace(replace(variables['Build.SourceBranchName'], 'main', 'prod'), 'refs/heads/', '')] 是运行时表达式，并且 displayName 在运行时之前计算 - 当 YAML 文件编译到计划中时。

这就是 Build.SourceBranchName 适合您的原因，因为此变量是在运行时之前评估的。