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# GitHub Slug action
[![Release][release-badge]][releases]
![Lint][lint-badge]
[![Licence][license-badge]][license]
This GitHub Action will expose the slug/short values of [some GitHub environment variables][github-env-vars] inside your GitHub workflow.
## Table of Contents
- [GitHub Slug action](#github-slug-action)
- [Table of Contents](#table-of-contents)
- [Overview](#overview)
- [Use this action](#use-this-action)
- [Available Environment variables](#available-environment-variables)
- [Enhanced variables](#enhanced-variables)
- [Partial variables](#partial-variables)
- [Slug variables](#slug-variables)
- [Slug URL variables](#slug-url-variables)
- [Short variables](#short-variables)
- [Contribute](#contribute)
- [Troubleshooting](#troubleshooting)
- [One of the environment variables doesn't work as intended](#one-of-the-environment-variables-doesnt-work-as-intended)
- [An action could not be found at the URI](#an-action-could-not-be-found-at-the-uri)
- [Thanks for talking about us](#thanks-for-talking-about-us)
## Overview
`SLUG` on a variable will
- put the variable content in lower case
- replace any character by `-` except `0-9`, `a-z`, `.`, and `_`
- remove leading and trailing `-` character
- limit the string size to 63 characters
<details>
<summary>Others <b>Slug-ish</b> commands are available</summary>
<p>
- `SLUG_URL` on a variable to have a `slug` variable compliant to be used in an URL
- Like `SLUG` but `.` is also replaced by `-`
- `SHORT` on a variable will limit the string size to 8 characters
- Useful for _sha_ value
- `<KEY>_PART` on a variable will give a part of a variable defined by a key
- Like `GITHUB_REPOSITORY_OWNER_PART` for the owner part of `GITHUB_REPOSITORY`
- `<VAR>_CS` on others variables to keep the value case-sensitive
- Like `GITHUB_REF_SLUG_CS`
</p>
</details>
Additional enhanced environment variables can be compute to help you around GitHub environment variables.
## Use this action
Add this in your workflow
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v4.x
```
Check for more [examples][examples] (OS usage, URL use, ...)
**Tip:** Use [Dependabot][dependabot] to maintain your `github-slug-action` version updated in your GitHub workflows.
## Available Environment variables
**Note**: If you don't find what you search for, read more about [available `GitHub` variables](docs/github-variables.md), and propose a [new custom variable][custom-variable].
### Enhanced variables
- `GITHUB_REF_NAME` will contains the reference name (branch or tag)
- based on `GITHUB_HEAD_REF` in a [`pull-request*`][webhooks-and-events] event context,
- based on `GITHUB_REF` in others event context.
**NOTE:** All enhanced variables are available in all **slug** formats.
### Partial variables
| Variable | Partial version of | Description |
| -------------------------------------------------------------------------------------- | ------------------ | ------------------------------------------------------ |
| [GITHUB_REPOSITORY_OWNER_PART](docs/partial-variables.md#github_repository_owner_part) | GITHUB_REPOSITORY | The Owner part of GITHUB_REPOSITORY variable |
| [GITHUB_REPOSITORY_NAME_PART](docs/partial-variables.md#github_repository_name_part) | GITHUB_REPOSITORY | The Repository name part of GITHUB_REPOSITORY variable |
### Slug variables
**NOTE:** `_CS` suffix available
| Variable | Slug version of | Description |
| ------------------------------------------------------------------------------------------------- | ---------------------------- | -------------------------------------------------------------------------------------------------------------------- |
| [GITHUB_REPOSITORY_SLUG](docs/slug-variables.md#github_repository_slug) | GITHUB_REPOSITORY | The owner and repository name. |
| [GITHUB_REPOSITORY<br>_OWNER_PART_SLUG](docs/slug-variables.md#github_repository_owner_part_slug) | GITHUB_REPOSITORY_OWNER_PART | The owner name. |
| [GITHUB_REPOSITORY<br>_NAME_PART_SLUG](docs/slug-variables.md#github_repository_name_part_slug) | GITHUB_REPOSITORY_NAME_PART | The repository name. |
| [GITHUB_REF_SLUG](docs/slug-variables.md#github_ref_slug) | GITHUB_REF | The branch or tag ref that triggered the workflow. |
| [GITHUB_HEAD_REF_SLUG](docs/slug-variables.md#github_head_ref_slug) | GITHUB_HEAD_REF | The branch of the head repository.<br>Only set for [pull-request][event-pull-request] event and forked repositories. |
| [GITHUB_BASE_REF_SLUG](docs/slug-variables.md#github_base_ref_slug) | GITHUB_BASE_REF | The branch of the base repository.<br>Only set for [pull-request][event-pull-request] event and forked repositories. |
| [GITHUB_EVENT_REF_SLUG](docs/slug-variables.md#github_event_ref_slug) | _github.event.ref_ | <br>Only set for [following webhook events][webhooks-and-events]<ul><li>`create`</li><li>`delete`</li></ul> |
### Slug URL variables
**NOTE:** `_CS` suffix available
| Variable | Slug URL version of | Description |
| --------------------------------------------------------------------------------------------------------- | ---------------------------- | --------------------------------------------------------------------------------------------------------------------- |
| [GITHUB_REPOSITORY_SLUG_URL](docs/slug-url-variables.md#github_repository_slug_url) | GITHUB_REPOSITORY | The owner and repository name. |
| [GITHUB_REPOSITORY<br>_OWNER_PART_SLUG_URL](docs/slug-variables.md#github_repository_owner_part_slug_url) | GITHUB_REPOSITORY_OWNER_PART | The owner name. |
| [GITHUB_REPOSITORY<br>_NAME_PART_SLUG_URL](docs/slug-variables.md#github_repository_name_part_slug_url) | GITHUB_REPOSITORY_NAME_PART | The repository name. |
| [GITHUB_REF_SLUG_URL](docs/slug-url-variables.md#github_ref_slug_url) | GITHUB_REF | The branch or tag ref that triggered the workflow. |
| [GITHUB_HEAD_REF_SLUG_URL](docs/slug-url-variables.md#github_head_ref_slug_url) | GITHUB_HEAD_REF | The branch of the head repository.<br>Only set for [pull-request][webhooks-and-events] event and forked repositories. |
| [GITHUB_BASE_REF_SLUG_URL](docs/slug-url-variables.md#github_base_ref_slug_url) | GITHUB_BASE_REF | The branch of the base repository.<br>Only set for [pull-request][webhooks-and-events] event and forked repositories. |
| [GITHUB_EVENT_REF_SLUG_URL](docs/slug-url-variables.md#github_event_ref_slug_url) | _github.event.ref_ | <br>Only set for [following webhook events][webhooks-and-events]<ul><li>`create`</li><li>`delete`</li></ul> |
### Short variables
| Variable | Short version of | Description |
| -------------------------------------------------------------------------------------------------------------------- | -------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [GITHUB_SHA_SHORT](docs/short-variables.md#github_sha_short) | GITHUB_SHA | The commit SHA that triggered the workflow. |
| [GITHUB_EVENT<br>_PULL_REQUEST<br>_HEAD_SHA_SHORT](docs/short-variables.md#github_event_pull_request_head_sha_short) | _github.event<br>.pull_request<br>.head.sha_ | The commit SHA on pull request that trigger workflow.<br>Only set for [following webhook events][webhooks-and-events]<ul><li>`pull_request`</li><li>`pull_request_review`</li><li>`pull_request_review_comment`</li><li>`pull_request_target`</li></ul> |
## Contribute
Follow [Developers guide](DEVELOPERS.md)
## Troubleshooting
### One of the environment variables doesn't work as intended
[**Note**][naming-conventions]: GitHub reserves the `GITHUB_` environment variable prefix for internal use by GitHub. Setting an environment variable or secret with the `GITHUB_` prefix will result in an error.
Currently, a GitHub workflow setting a `GITHUB_` variable will not cause an error, it will just fail silently.
And if a custom `GITHUB_` variable is in conflict with an official `GITHUB_` variable, the offical `GITHUB_` variable will override custom one.
<details>
<summary>Test workflow</summary>
<p>
```yaml
name: Test
on: push
jobs:
build:
runs-on: ubuntu-latest
steps:
- run: echo ${GITHUB_REF}
# print "refs/heads/v4.x"
- run: echo "GITHUB_REF=one_value" >> "$GITHUB_ENV"
- run: echo ${GITHUB_REF}
# print "refs/heads/v4.x"
- run: echo "GITHUB_REF_SLUG=another_value" >> "$GITHUB_ENV"
- run: echo ${GITHUB_REF_SLUG}
# print "another_value"
```
</p>
</details>
### An action could not be found at the URI
If your workflow fail on the `Set up job` task with this kind of log :
```text
Download action repository 'rlespinasse/github-slug-action@master'
##[error]An action could not be found at the URI 'https://api.github.com/repos/rlespinasse/github-slug-action/tarball/master'
```
> The master branch doesn't exists anymore.
>
> The master branch EOL has been set to **2020-10-25** after a 6-month deprecation period (more information on the [EOL issue][issue-15])
Please, use the current branch `v4.x` or a version tag (see [releases pages][releases]) in order to fix your workflow.
## Thanks for talking about us
- [Mettre en place une CI/CD Angular avec GitHub Actions & Netlify][article-1] (in french :fr:)
- [Github Actions : enfin des pipelines accessibles aux développeurs][talk-1] (in french :fr:)
- [Action spotlight by Michael Heap][article-2]
- The next one is you. _Don't hesitate to add youself to this list._
[release-badge]: https://img.shields.io/github/workflow/status/rlespinasse/github-slug-action/Release?label=Build&logo=github&style=flat-square
[lint-badge]: https://img.shields.io/github/workflow/status/rlespinasse/github-slug-action/Lint?label=Lint&logo=github&style=flat-square
[license-badge]: https://img.shields.io/github/license/rlespinasse/github-slug-action?style=flat-square
[actions]: https://github.com/rlespinasse/github-slug-action/actions
[license]: https://github.com/rlespinasse/github-slug-action/blob/v4.x/LICENSE
[examples]: https://github.com/rlespinasse/github-slug-action/tree/v4.x/examples
[custom-variable]: https://github.com/rlespinasse/github-slug-action/issues/new?assignees=&labels=enhancement&template=feature_request.md&title=
[releases]: https://github.com/rlespinasse/github-slug-action/releases
[issue-15]: https://github.com/rlespinasse/github-slug-action/issues/15
[github-env-vars]: https://docs.github.com/en/free-pro-team@latest/actions/reference/environment-variables#default-environment-variables
[dependabot]: https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot
[webhooks-and-events]: https://docs.github.com/en/developers/webhooks-and-events/webhook-events-and-payloads
[naming-conventions]: https://docs.github.com/en/actions/reference/environment-variables#naming-conventions-for-environment-variables
[article-1]: https://esensconsulting.medium.com/mettre-en-place-une-ci-cd-angular-avec-github-actions-netlify-ca0b59b99ed8
[article-2]: https://michaelheap.com/github-slug-action/
[talk-1]: https://www.youtube.com/watch?v=RHnTJBwcE98
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