GitHub Workflow中set-output警告更新后仍未消除的问题排查

问题描述 #

尝试更新GitHub Workflow中的set-output语法，已参考GitHub官方指南修改，但仍收到语法过时警告。当前使用actions/checkout@v3，相关工作流代码如下（原代码仅注释了新语法，未实际启用）：

jobs:
  build:
    runs-on: ubuntu-latest
    outputs:
      branch: ${{ steps.extract_branch.outputs.branch }}
      channel: ${{ steps.extract_channel.outputs.channel }}
    steps:
    - uses: actions/checkout@v3
      # In this step, this action saves a list of existing images,
      # the cache is created without them in the post run.
      # It also restores the cache if it exists.
    - name: Install Octopus CLI 🐙
      uses: OctopusDeploy/install-octopus-cli-action@v3
    - name: Extract branch name
      shell: bash
      id: extract_branch
      run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
      # run: echo "branch=$(echo ${GITHUB_REF#refs/heads/})" >> $GITHUB_OUTPUT
    - name: Determine Octopus Deployment Channel
      shell: bash
      id: extract_channel
      run: |
          BRANCH="${{ steps.extract_branch.outputs.branch }}"
          CHANNEL="Features"
            if [[ "$BRANCH" == "main" ]] || [[ "$BRANCH" == "release/*" ]]; then
              CHANNEL="default"
            fi
            
            echo "##[set-output name=channel;]$(echo $CHANNEL)"
        # echo "channel=$(echo $CHANNEL)" >> $GITHUB_OUTPUT

解决步骤 #

• 彻底移除旧的##[set-output]语法，启用注释中的echo "key=value" >> $GITHUB_OUTPUT格式
• 简化变量输出逻辑：无需嵌套echo命令，直接输出变量即可，减少冗余
• 修正分支匹配逻辑：bash中==不支持通配符，需用=~结合正则表达式匹配release/*分支

修改后的完整工作流代码 #

jobs:
  build:
    runs-on: ubuntu-latest
    outputs:
      branch: ${{ steps.extract_branch.outputs.branch }}
      channel: ${{ steps.extract_channel.outputs.channel }}
    steps:
    - uses: actions/checkout@v3
      # In this step, this action saves a list of existing images,
      # the cache is created without them in the post run.
      # It also restores the cache if it exists.
    - name: Install Octopus CLI 🐙
      uses: OctopusDeploy/install-octopus-cli-action@v3
    - name: Extract branch name
      shell: bash
      id: extract_branch
      # 简化分支提取逻辑，直接输出到GITHUB_OUTPUT
      run: echo "branch=${GITHUB_REF#refs/heads/}" >> $GITHUB_OUTPUT
    - name: Determine Octopus Deployment Channel
      shell: bash
      id: extract_channel
      run: |
          BRANCH="${{ steps.extract_branch.outputs.branch }}"
          CHANNEL="Features"
          # 使用正则匹配所有以release/开头的分支
          if [[ "$BRANCH" == "main" ]] || [[ "$BRANCH" =~ ^release/ ]]; then
            CHANNEL="default"
          fi
          # 直接输出CHANNEL变量到GITHUB_OUTPUT
          echo "channel=$CHANNEL" >> $GITHUB_OUTPUT

关键说明 #

1. 旧的##[set-output]命令已被GitHub标记为过时，必须完全替换为$GITHUB_OUTPUT的输出方式
2. bash环境中，==仅支持精确字符串匹配，通配符匹配需使用=~运算符结合正则表达式
3. 避免使用echo $(echo $VAR)的冗余写法，直接引用变量即可减少不必要的系统调用

内容的提问来源于stack exchange，提问作者Sabrina Grosse