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Added explanation about workdir override in entrypoint #14553

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Feb 1, 2022
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Added explanation about workdir override in entrypoint #14553

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Added explanation about workdir override in entrypoint
nikola-jokic Jan 24, 2022
d71e158
Update content/actions/creating-actions/dockerfile-support-for-github…
nikola-jokic Feb 1, 2022
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Merge branch 'main' into patch-2
skedwards88 Feb 1, 2022
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6 changes: 6 additions & 0 deletions content/actions/creating-actions/dockerfile-support-for-github-actions.md
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Expand Up @@ -47,6 +47,12 @@ If you define `entrypoint` in an action's metadata file, it will override the `E

The Docker `ENTRYPOINT` instruction has a _shell_ form and _exec_ form. The Docker `ENTRYPOINT` documentation recommends using the _exec_ form of the `ENTRYPOINT` instruction. For more information about _exec_ and _shell_ form, see the [ENTRYPOINT reference](https://docs.docker.com/engine/reference/builder/#entrypoint) in the Docker documentation.

{% warning %}

**Warning:** If you are using `WORKDIR` inside your Dockerfile, when specifying a path to your `entrypoint`, use the absolute path. The `WORKDIR` override will change the present working directory to `/github/workspace`, but the previous steps would be using the `WORKDIR` you specified in a Dockerfile.

{% endwarning %}
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If you configure your container to use the _exec_ form of the `ENTRYPOINT` instruction, the `args` configured in the action's metadata file won't run in a command shell. If the action's `args` contain an environment variable, the variable will not be substituted. For example, using the following _exec_ format will not print the value stored in `$GITHUB_SHA`, but will instead print `"$GITHUB_SHA"`.

```dockerfile
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