Getting current branch and commit hash in GitHub action

Question

I want to build a docker image using a GitHub action, migrating from TeamCity.

In the build script, I want to tag the image with a combination of branch and commit, e.g.

Answer 1

A handy way to get the currrent branch and commit sha on the workflow could be getting it and saving on a "variable".

  - name: Declare some variables
    id: vars
    shell: bash
    run: |
      echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
      echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"

  - name: Another step
    run: |
      echo "Branch: ${{ steps.vars.outputs.branch }}"
      echo "Sha: ${{ steps.vars.outputs.sha_short }}"

Maybe your docker-build.sh could receive the branch and she as parameter, os the full version as parameter.

  - name: Create docker image
     run: ./docker-build.sh "${{ steps.vars.outputs.branch }}.${{ steps.vars.outputs.sha_short }}"

OR JUST

  - name: Create docker image
     run: ./docker-build.sh "${GITHUB_REF#refs/heads/}.${GITHUB_SHA}"

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On this action you can see many tests I done to see what works, what don't.