如何在Github行动中获得当前的分支?

假设${{github。Ref}}类似于refs/heads/mybranch，你可以使用以下方法提取分支名称:

steps:
  - name: Prints the current branch name
    run: echo "${GITHUB_BRANCH##*/}"
    env:
      GITHUB_BRANCH: ${{ github.ref }}

如果你的分支包含斜杠(比如feature/foo)，使用下面的语法:

steps:
  - name: Prints the current branch name
    run: echo "${GITHUB_REF#refs/heads/}"

致谢:@rmunn评论

或者使用已接受答案的方法，这里是更短的版本(lint友好):

steps:
  - name: Get the current branch name
    shell: bash
    run: echo "::set-output name=branch::${GITHUB_REF#refs/heads/}"
    id: myref

然后在其他步骤中引用${{steps.myref.outputs.branch}}。

注:

上述方法仅适用于基于unix的映像(Linux和macOS)。 对于文档，请阅读:GitHub Actions的上下文和表达式语法。

我相信GITHUB_REF是唯一包含分支名称的环境变量。

你可以从字符串的其余部分提取分支名称，如下所示:

${GITHUB_REF##*/}

例子:

$ GITHUB_REF=refs/heads/feature-branch-1
$ echo ${GITHUB_REF##*/}
feature-branch-1

更新:添加了一个完整的工作流示例。

工作流

name: CI
on: push
jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Git checkout
        uses: actions/checkout@v1
      - name: Branch name
        run: echo running on branch ${GITHUB_REF##*/}
      - name: Build
        run: docker build -t tedmiston/tag-example:${GITHUB_REF##*/} .

来源:https://github.com/tedmiston/x/blob/master/.github/workflows/workflow.yml

示例输出-主分支

Run docker build -t tedmiston/tag-example:${GITHUB_REF##*/} .
  docker build -t tedmiston/tag-example:${GITHUB_REF##*/} .
  shell: /bin/bash -e {0}
Sending build context to Docker daemon  146.9kB

Step 1/1 : FROM alpine
latest: Pulling from library/alpine
9d48c3bd43c5: Pulling fs layer
9d48c3bd43c5: Verifying Checksum
9d48c3bd43c5: Download complete
9d48c3bd43c5: Pull complete
Digest: sha256:72c42ed48c3a2db31b7dafe17d275b634664a708d901ec9fd57b1529280f01fb
Status: Downloaded newer image for alpine:latest
 ---> 961769676411
Successfully built 961769676411
Successfully tagged tedmiston/tag-example:master

日志:https://github.com/tedmiston/x/commit/cdcc58a908e41d3d90c39ab3bf6fef1ad2c4238a/checks一步:16

示例输出-非主分支

Run docker build -t tedmiston/tag-example:${GITHUB_REF##*/} .
  docker build -t tedmiston/tag-example:${GITHUB_REF##*/} .
  shell: /bin/bash -e {0}
Sending build context to Docker daemon  144.9kB

Step 1/1 : FROM alpine
latest: Pulling from library/alpine
9d48c3bd43c5: Pulling fs layer
9d48c3bd43c5: Verifying Checksum
9d48c3bd43c5: Download complete
9d48c3bd43c5: Pull complete
Digest: sha256:72c42ed48c3a2db31b7dafe17d275b634664a708d901ec9fd57b1529280f01fb
Status: Downloaded newer image for alpine:latest
 ---> 961769676411
Successfully built 961769676411
Successfully tagged tedmiston/tag-example:branch-name-test

日志:https://github.com/tedmiston/x/commit/4e8d31259f861aaa2c30375756fc081c3659bddf/checks一步:16

有关参数展开语法的更多信息，请参阅这个答案。

作为参考，GitHub Actions的虚拟环境页面列出了执行环境中可用的所有环境变量。

GitHub Action FranzDiebold/ GitHub -env- vals - Action公开了几个有用的环境变量，例如当前分支名称及其slug值。我为这个用例做了这个操作。

使用

steps:
  - uses: FranzDiebold/github-env-vars-action@v1.2.0
  - name: Print environment variables
    run: |
      echo "GITHUB_REPOSITORY_SLUG=$GITHUB_REPOSITORY_SLUG"
      echo "GITHUB_REPOSITORY_OWNER=$GITHUB_REPOSITORY_OWNER"
      echo "GITHUB_REPOSITORY_OWNER_SLUG=$GITHUB_REPOSITORY_OWNER_SLUG"
      echo "GITHUB_REPOSITORY_NAME=$GITHUB_REPOSITORY_NAME"
      echo "GITHUB_REPOSITORY_NAME_SLUG=$GITHUB_REPOSITORY_NAME_SLUG"
      echo "GITHUB_REF_SLUG=$GITHUB_REF_SLUG"
      echo "GITHUB_REF_NAME=$GITHUB_REF_NAME"
      echo "GITHUB_REF_NAME_SLUG=$GITHUB_REF_NAME_SLUG"
      echo "GITHUB_SHA_SHORT=$GITHUB_SHA_SHORT"

所有操作系统(Linux, macOS和Windows)的演示也可以在存储库的演示工作流文件!

为了获得delete事件上的ref名称，我最终使用了sed。

on:
  delete:
...
steps:
  - name: Do something
    shell: bash
    run: |
      refname=$(sed -e s:refs/heads/::g -e s:/:-:g <<< ${{ github.event.ref }})

剪掉指针/头/并将斜杠转换为破折号，例如。引用/heads/feature/somefeature到feature-somefeature

我添加了一个单独的步骤，用于从$GITHUB_REF提取分支名称，并将其设置为步骤输出

- name: Extract branch name
  shell: bash
  run: echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
  id: extract_branch

在那之后，我可以在接下来的步骤中使用它

- name: Push to ECR
  id: ecr
  uses: jwalton/gh-ecr-push@master
  with:
    access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
    secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
    region: us-west-2
    image: eng:${{ steps.extract_branch.outputs.branch }}

如果你使用的是V2的actions/checkout，那么你总是可以运行git branch——show-current来获取当前签出的分支的名称。