[GitHub Action] How to concatenate a string with a GitHub Actions environment variable?

[kevinadhiguna]

Hi, I would like to ask how to concatenate a string and a GitHub Actions environment variable which is GITHUB_SHA in this case.

List of GitHub Action environment variables : Environment variables - GitHub Docs

This is the file (main.yml) :

image1062×480 59.8 KB

This is the error I got in GitHub Action :

error: invalid tag "***/strapi-v4-dockerize:development-$GITHUB_SHA": invalid reference format
Error: buildx failed with: error: invalid tag "***/strapi-v4-dockerize:development-$GITHUB_SHA": invalid reference format

Expected output :
myaccount/strapi-v4-dockerize:development-ffac537e6cbbf934b08745a378932722df287a53

Any help is appreciated.

[airtower-luna]

$GITHUB_SHA is shell syntax, but the tags argument isn’t a shell. Pretty much the only place in an Actions workflow where you have a shell are run steps.

You need to use Actions syntax here. I think ${{ github.sha }} is what you want, see github context.

[kevinadhiguna]

Thanks @airtower-luna !

It worked.

[brianjmurrell]

But if one did want to do a concatenation in a shell run step such as:

echo "contains: ${{ contains(needs.Import-commit-pragmas.outputs.pr-repos, ${{ inputs.NAME }}@) }}"

what is the correct way to do that so that the second argument of contains() is inputs.NAME plus @ concatenated?

And then alternatively what if one wanted to do the same in an if: statement such as:

    if: |
        ${{ !contains(needs.Import-commit-pragmas.outputs.pr-repos, ${{inputs.NAME}}@) }}

[airtower-luna]

You'll probably need the format() function, something similar to:

contains(needs.Import-commit-pragmas.outputs.pr-repos, format('{0}@', inputs.NAME))

Mind that using ${{ }} templating in run scripts can create injection vulnerabilities, probably better to set an environment variable for the step and use that in the script.