How to get the short sha for the github workflow?

Question

I am creating a workflow in GitHub which creates and uses a docker image. Therefore I have started my workflow file with a global environment variable for this docker image which is visible for all the jobs in my workflow:

name: continuous integration on:   push:     branches:       - '**'  env:   IMAGE: docker.pkg.github.com/${{ github.repository }}/jactor-persistence:${{ github.sha }} 

I want to replace ${{ github.sha }} with the short sha of the head commit, the same as the result of the following command git rev-parse --short HEAD

Is this possible?

Answer 1

As VonC mentioned, you can just compute the string yourself in a previous step.

      - name: Set outputs         id: vars         run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"       - name: Check outputs         run: echo ${{ steps.vars.outputs.sha_short }} 

Answer 2

You can also set an environment variable with the short sha:

    - name: Add SHORT_SHA env property with commit short sha       run: echo "SHORT_SHA=`echo ${GITHUB_SHA} | cut -c1-8`" >> $GITHUB_ENV 

SHORT_SHA can then be used like any other environment variable, e.g. like this:

    - name: My step       run: myscript ${SHORT_SHA}