GitHub Actions 中的条件“需求”？

Question

我的 GitHub 工作流程如下所示：

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - run: echo "build"

  test:
    runs-on: ubuntu-latest
    needs: build

    steps:
      - run: echo "build"

  deploy:
    runs-on: ubuntu-latest
    needs: [build, test]

    steps:
      - run: echo "deploy"

现在，我想使该deploy步骤仅tests在分支为 时才需要该步骤main。

那可能吗？

本质上我想做这样的事情：

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - run: echo "build"

  test:
    runs-on: ubuntu-latest
    needs: build

    steps:
      - run: echo "build"

  deploy:
    runs-on: ubuntu-latest
    needs: contains(branch, "master") ? [build, test] : [build] #notice this line

    steps:
      - run: echo "deploy"

Answer 1

GitHub 操作不允许有条件的需求（不幸的是，恕我直言）。

然而，有一个解决方法：通过在needs. 无论先决条件发生什么，所有需要运行的作业都需要将if条件设置为always()。

如果先前作业的失败应该导致终止，您需要添加一个步骤来验证作业结果。

这是一个通用的适配解决方案：

jobs:
  init_job:
    runs-on: ubuntu-latest
    steps:
      - run: echo "initial run"

  conditional_job:
    runs-on: ubuntu-latest
    needs: init_job
    if: ${{ your condition here }}
    steps:
      - run: echo "conditonal run"

  final_job:
    needs: conditional_job
    if: always()
    steps:
      - name: fail if conditional job failed
        if: ${{ needs.conditional_job.result == 'failure' }}
        run: exit 1
      - run: echo "final run"

Answer 2

不理想，但你可以使用这个：

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - run: echo "build"

  test:
    runs-on: ubuntu-latest
    needs: build

    steps:
      - run: echo "build"

  deploy-main:
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main'
    needs: [build, test]

    steps:
      - run: echo "deploy"
        
  deploy:
    runs-on: ubuntu-latest
    if: github.ref != 'refs/heads/main'
    needs: build

    steps:
      - run: echo "deploy"