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Ubuntu – Environment variable in GitHub Actions not interpolated correctly

In the beginning of a (re-usable) workflow

env:
  STAGING_GCR_PROJECT: my-project-id

and when using it

  slack_staging_success:
    needs: build_staging
    runs-on: ubuntu-latest
    if: ${{ always() && contains(join(needs.*.result, ','), 'success') }}
    env:
      STAGING_IMAGE: "gcr.io/$STAGING_GCR_PROJECT/${{ inputs.image_name }}:${{ inputs.image_tag }}"

    
    steps:
      
    - name: slack success for staging
      uses: rtCamp/action-slack-notify@v2
      env:
        SLACK_ICON: $SLACK_ICON_SUCCESS
        SLACK_COLOR: green
        SLACK_MESSAGE: "STAGING image ${{ env.STAGING_IMAGE }} was built / pushed with SUCCESS"

In Slack the message interpolates as

STAGING image gcr.io/$STAGING_GCR_PROJECT/echo-server:1.0.2 failed to be built

Why isn’t $STAGING_GCR_PROJECT interpolated correctly?

Tags:

2

Answers


  1. 0

    In order to use workflow environment variables, use the prefix env. and enclose it in ${{ }} just like you did with the inputs:

    env:
  STAGING_IMAGE: "gcr.io/${{ env.STAGING_GCR_PROJECT }}/${{ inputs.image_name }}:${{ inputs.image_tag }}"
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  2. 0

    It is not supported at the moment, to have env variable inside env.

    The docs on env mentions it:

    variables in the env map cannot be defined in terms of other variables in the map.

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