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https://github.com/rlespinasse/github-slug-action
GitHub Action to expose slug value of GitHub environment variables inside your GitHub workflow
https://github.com/rlespinasse/github-slug-action
continuous-delivery continuous-deployment continuous-integration github-actions hacktoberfest short slug workflows
Last synced: about 2 months ago
JSON representation
GitHub Action to expose slug value of GitHub environment variables inside your GitHub workflow
- Host: GitHub
- URL: https://github.com/rlespinasse/github-slug-action
- Owner: rlespinasse
- License: mit
- Created: 2019-11-05T23:54:11.000Z (almost 5 years ago)
- Default Branch: v4.x
- Last Pushed: 2024-07-16T06:55:17.000Z (2 months ago)
- Last Synced: 2024-08-01T13:17:36.103Z (about 2 months ago)
- Topics: continuous-delivery, continuous-deployment, continuous-integration, github-actions, hacktoberfest, short, slug, workflows
- Language: Shell
- Homepage:
- Size: 1.2 MB
- Stars: 244
- Watchers: 5
- Forks: 35
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Contributing: CONTRIBUTING.md
- Funding: .github/FUNDING.yml
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
- Security: SECURITY.md
Awesome Lists containing this project
README
# GitHub Slug action
This GitHub Action will expose the slug/short values of [some GitHub environment variables][default-environment-variables] 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)
- [Migration from previous versions](#migration-from-previous-versions)
- [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)
- [Troubleshooting](#troubleshooting)
- [The SHORT variables doesn't have the same lengths as before](#the-short-variables-doesnt-have-the-same-lengths-as-before)
- [One of the environment variables doesn't work as intended](#one-of-the-environment-variables-doesnt-work-as-intended)
- [Known environment variable conflicts](#known-environment-variable-conflicts)
- [GITHUB_REF_NAME](#github_ref_name)
- [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 `-` characters
- limit the string size to 63 characters
- remove trailing `-` characters
Others Slug-ish commands are available
- `SLUG_URL` on a variable to have a `slug` variable compliant to be used in an URL
- Like `SLUG` but `.`, and `_` are also replaced by `-`
- `SHORT` on a variable will limit the string size to ~8 characters
- Useful for _sha_ value
- `_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`
- `_CS` on others variables to keep the value case-sensitive
- Like `GITHUB_REF_SLUG_CS`
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
```
Others configurations
- With a prefix
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v4
with:
prefix: CI_
```
- With another max length for slug values
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v4
with:
slug-maxlength: 80 # Use 'nolimit' to remove use of a max length (Default to 63)
```
- With another length for short values
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v4
with:
short-length: 7 # By default it's up to git to decide, use 8 to have the v3.x behavior
```
**Warning**: If you leave it empty, you need to checkout the source first in order to let git decide the size by itself.
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.
### Migration from previous versions
The short sha length is not the same as previous version.
- `v4` let git configuration decide of it (but you can override it),
- `v3` and before, it's always a length of 8 characters.
So to reproduce previous behavior, use
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v4
with:
short-length: 8 # Same as v3 and before
```
## 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
_OWNER_PART_SLUG](docs/slug-variables.md#github_repository_owner_part_slug) | GITHUB_REPOSITORY_OWNER_PART | The owner name. |
| [GITHUB_REPOSITORY
_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.
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.
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_ |
Only set for [following webhook events][webhooks-and-events]
- `create`
- `delete`
### 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
_OWNER_PART_SLUG_URL](docs/slug-variables.md#github_repository_owner_part_slug_url) | GITHUB_REPOSITORY_OWNER_PART | The owner name. |
| [GITHUB_REPOSITORY
_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.
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.
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_ |
Only set for [following webhook events][webhooks-and-events]
- `create`
- `delete`
### 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
_PULL_REQUEST
_HEAD_SHA_SHORT](docs/short-variables.md#github_event_pull_request_head_sha_short) | _github.event
.pull_request
.head.sha_ | The commit SHA on pull request that trigger workflow.
Only set for [following webhook events][webhooks-and-events]
- `pull_request`
- `pull_request_review`
- `pull_request_review_comment`
- `pull_request_target`
## Troubleshooting
### The SHORT variables doesn't have the same lengths as before
Since `v4`, it's git who manage the short variables by using [git rev-parse][git-revparse] behaviour.
The length of a short sha depends of the size of our repository and can differ over time.
To manage that moving length, you can use `short-length` input
- set `7` to reproduce `small repository` behavior
- set `8` to reproduce `v3` behavior
**Warning**: The minimum length is 4, the default is the effective value of the [core.abbrev][git-core-abbrev] configuration variable.
### One of the environment variables doesn't work as intended
[**Note**][naming-conventions]: When you set a custom environment variable, you cannot use any of the default environment variable names. For a complete list of these, see [Default environment variables][default-environment-variables]. **If you attempt to override the value of one of these default environment variables, the assignment is ignored.**
If a variable start to be used as default environment variable, the environment variable may have a different behavior than the expected one.
If this append, the `${{ env.GITHUB_AWESOME_VARIABLE }}` and `$GITHUB_AWESOME_VARIABLE` expression will not works in the same way.
- `${{ env.GITHUB_AWESOME_VARIABLE }}` will serve the behavior of this action,
- `$GITHUB_AWESOME_VARIABLE` will serve the behavior of GitHub Action.
Otherwise the two expression will serve the behavior of this action.
This will not occurs if you use the `prefix` input to avoid the issue.
**NOTE:** If detected, the maintainers of this action will choose the best course of action depending of the impact.
#### Known environment variable conflicts
##### GITHUB_REF_NAME
The behavior is the same as the GitHub one except on `pull_request*` workflows ([Ready the full story][issue-104]).
- `${{ env.GITHUB_REF_NAME }}` will serve the behavior of this action,
- `$GITHUB_REF_NAME` will serve the behavior of GitHub Action.
On `pull_request*` workflows, the content will be `/merge` instead of the branch name.
A possible workaround is to use `prefix` input
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v4
with:
prefix: CI_
```
Then `${{ env.CI_GITHUB_REF_NAME }}`, and `$CI_GITHUB_REF_NAME` will serve the behavior of this action.
And `$GITHUB_REF_NAME` will serve the behavior of GitHub Action.
### 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@GIT_REFERENCE'
##[error]An action could not be found at the URI 'https://api.github.com/repos/rlespinasse/github-slug-action/tarball/GIT_REFERENCE'
```
If the `GIT_REFERENCE` value is
- `v4.x` or after, the branch don't exists anymore following the [end-of-life for a branch](SECURITY.md#end-of-life-of-a-branch) security process.
- `master`, the branch don't exists anymore, read more about it on the corresponding issue ([EOL issue][issue-15])
Please, use the current major tag `v4` or a version tag (see [releases pages][releases]) in order to fix your workflow.
## Thanks for talking about us
In English :gb:
- [Action spotlight by Michael Heap][article-2]
- [Serverless Deploy Previews on GitHub Actions][article-3]
- [Let's Build a Continuous Delivery and Branching Process with Github Actions, Vercel and Heroku][article-4]
In French :fr:
- [Mettre en place une CI/CD Angular avec GitHub Actions & Netlify][article-1]
- [Github Actions : enfin des pipelines accessibles aux développeurs][talk-1]
In Chinese :cn:
- [利用github-slug-action暴漏Github Action上下文中的关键变量][article-5]
> The next one is you. _Don't hesitate to add youself to one of these lists._
[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
[issue-104]: https://github.com/rlespinasse/github-slug-action/issues/104
[git-revparse]: https://git-scm.com/docs/git-rev-parse#Documentation/git-rev-parse.txt---shortlength
[git-core-abbrev]: https://git-scm.com/docs/git-config#Documentation/git-config.txt-coreabbrev
[default-environment-variables]: https://docs.github.com/en/actions/learn-github-actions/environment-variables#default-environment-variables
[dependabot]: https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-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/
[article-3]: https://barstool.engineering/serverless-deploy-previews-on-github-actions/
[article-4]: https://javascript.plainenglish.io/lets-build-a-continuous-delivery-and-branching-process-c27dae09f0b6
[article-5]: https://eryajf.github.io/HowToStartOpenSource/views/03-github-tips/10-Use-github-slug-action-to-leak-key-variables-in-the-Github-Action-context.html
[talk-1]: https://www.youtube.com/watch?v=F5mBDmOQcvE