Github Actions，如何在作业步骤之间共享计算值? [英] Github Actions, how to share a calculated value between job steps?

问题描述

使用Github Actions是否有DRY方式可以在多个工作步骤中计算和共享值?

Is there a DRY way to calculate and share a value in multiple job steps with Github Actions?

在下面的工作流程yml文件中，回显$ {GITHUB_REF} | cut -d'/'-f3`-$ {GITHUB_SHA} 会重复执行.

In the below workflow yml file, echo ${GITHUB_REF} | cut -d'/' -f3`-${GITHUB_SHA} is repeated in multiple steps.

name: Test, Build and Deploy
on:
  push:
    branches:
      - master
jobs:
  build_and_push:
    name: Build and Push
    runs-on: ubuntu-latest
    steps:
      - name: Docker Build
        uses: "actions/docker/cli@master"
        with:
          args: build . --file Dockerfile -t cflynnus/blog:`echo ${GITHUB_REF} | cut -d'/' -f3`-${GITHUB_SHA}
      - name: Docker Tag Latest
        uses: "actions/docker/cli@master"
        with:
          args: tag cflynnus/blog:`echo ${GITHUB_REF} | cut -d'/' -f3`-${GITHUB_SHA} cflynnus/blog:latest

推荐答案

set-output can be used to define outputs for steps. The outputs can then be used in later steps and evaluated in with and env input sections.

以下是您的示例的外观.

The following is what that would look like for your example.

name: Test, Build and Deploy
on:
  push:
    branches:
      - master
jobs:
  build_and_push:
    name: Build and Push
    runs-on: ubuntu-latest
    steps:
      - name: Set tag var
        id: vars
        run: echo ::set-output name=docker_tag::$(echo ${GITHUB_REF} | cut -d'/' -f3)-${GITHUB_SHA}
      - name: Docker Build
        uses: "actions/docker/cli@master"
        with:
          args: build . --file Dockerfile -t cflynnus/blog:${{ steps.vars.outputs.docker_tag }}
      - name: Docker Tag Latest
        uses: "actions/docker/cli@master"
        with:
          args: tag cflynnus/blog:${{ steps.vars.outputs.docker_tag }} cflynnus/blog:latest

这是另一个示例，展示了如何动态设置动作要使用的多个变量.

Here is another example showing how to dynamically set multiple variables to be used by an action.

      - name: Set output variables
        id: vars
        run: |
          echo ::set-output name=pr_title::"[Test] Add report file $(date +%d-%m-%Y)"
          echo ::set-output name=pr_body::"This PR was auto-generated on $(date +%d-%m-%Y) \
            by [create-pull-request](https://github.com/peter-evans/create-pull-request)."
      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v2
        with:
          title: ${{ steps.vars.outputs.pr_title }}
          body: ${{ steps.vars.outputs.pr_body }}

或者，您可以创建环境变量.

Alternatively you can create environment variables.

      - name: Set environment variables
        run: |
          echo "PR_TITLE=[Test] Add report file $(date +%d-%m-%Y)" >> $GITHUB_ENV
          echo "PR_BODY=This PR was auto-generated on $(date +%d-%m-%Y) by [create-pull-request](https://github.com/peter-evans/create-pull-request)." >> $GITHUB_ENV
      - name: Create Pull Request
        uses: peter-evans/create-pull-request@v2
        with:
          title: ${{ env.PR_TITLE }}
          body: ${{ env.PR_BODY }}

更新:不赞成使用第一个示例中的docker操作.请参阅此答案以了解在GitHub中使用docker的最新方法动作.

Update: The docker actions in the first example are deprecated. Please see this answer for the latest way to work with docker in GitHub Actions.

注意:有关在个不同作业之间共享价值的信息，请参见

Note: For sharing values between different jobs, see this question.

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