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github-slug-action/README.md
2020-04-26 02:12:41 +02:00

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# GitHub Slug action
[![Actions Status](https://github.com/rlespinasse/github-slug-action/workflows/Build/badge.svg)](https://github.com/rlespinasse/github-slug-action/actions)
This action slug and expose some github variables.
`Slug` 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
Others `Slug`-ish commands are available:
- `Slug URL` a variable will be like the `slug` variable but the `.` character will also be replaced by `-`
- `Short SHA` a variable will limit the string size to 8 characters
## Exposed environment variables
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v2.x
- name: Print slug/short variables
run: |
echo "Slug variables"
echo " - ${{ env.GITHUB_REF_SLUG }}"
echo " - ${{ env.GITHUB_HEAD_REF_SLUG }}"
echo " - ${{ env.GITHUB_BASE_REF_SLUG }}"
echo " - ${{ env.GITHUB_REPOSITORY_SLUG }}"
echo "Slug URL variables"
echo " - ${{ env.GITHUB_REF_SLUG_URL }}"
echo " - ${{ env.GITHUB_HEAD_REF_SLUG_URL }}"
echo " - ${{ env.GITHUB_BASE_REF_SLUG_URL }}"
echo " - ${{ env.GITHUB_REPOSITORY_SLUG_URL }}"
echo "Short SHA variables"
echo " - ${{ env.GITHUB_SHA_SHORT }}"
```
Read [default environment variables](https://help.github.com/en/actions/configuring-and-managing-workflows/using-environment-variables#default-environment-variables) page for more information.
### GITHUB_REF_SLUG(_URL)
Slug the environment variable **GITHUB_REF**
The branch or tag ref that triggered the workflow.
_If neither a branch or tag is available for the event type, the variable will not exist._
| GITHUB_REF | GITHUB_REF_SLUG | GITHUB_REF_SLUG_URL |
|--------------------------------|---------------------|---------------------|
| refs/heads/master | master | master |
| refs/heads/feat/new_feature | feat-new-feature | feat-new-feature |
| refs/tags/v1.0.0 | v1.0.0 | v1-0-0 |
| refs/tags/product@1.0.0-rc.2 | product-1.0.0-rc.2 | product-1-0-0-rc-2 |
| refs/heads/New_Awesome_Product | new-awesome-product | new-awesome-product |
> **NOTE :**
> GITHUB_REF_SLUG_URL is design to be used as subdomain in an URL.
_Additional variables (only set for forked repositories) :_
- `GITHUB_HEAD_REF_SLUG`/`GITHUB_HEAD_REF_SLUG_URL`, The branch of the head repository **GITHUB_HEAD_REF**
- `GITHUB_BASE_REF_SLUG`/`GITHUB_BASE_REF_SLUG_URL`, The branch of the base repository **GITHUB_BASE_REF**
### GITHUB_REPOSITORY_SLUG
Slug the environment variable **GITHUB_REPOSITORY**
The owner and repository name.
| GITHUB_REPOSITORY | GITHUB_REPOSITORY_SLUG | GITHUB_REPOSITORY_SLUG_URL |
|----------------------------|----------------------------|----------------------------|
| octocat/Hello-World | octocat-hello-world | octocat-hello-world |
| rlespinasse/Hello-World.go | rlespinasse-hello-world.go | rlespinasse-hello-world-go |
> **NOTE :**
> GITHUB_REF_SLUG_URL is design to be used as subdomain in an URL.
### GITHUB_SHA_SHORT
Short the environment variable **GITHUB_SHA**
The commit SHA that triggered the workflow
| GITHUB_SHA | GITHUB_SHA_SHORT |
|------------------------------------------|------------------|
| ffac537e6cbbf934b08745a378932722df287a53 | ffac537e |
### Use slug variable in an URL
In an URL, use `<GITHUB_VARIABLE>_SLUG_URL` instead of **<GITHUB_VARIABLE>_SLUG** as subdomain to be compliant.
> **NOTE :**
> <GITHUB_VARIABLE>_SLUG can be used in an URL only as part of the _resource path_.
```yaml
- name: Inject slug/short variables
uses: rlespinasse/github-slug-action@v2.x
- name: Deploy dummy application using slug in the 'subdomain' part
run: |
./deploy-application.sh --url "https://${{ env.<GITHUB_VARIABLE>_SLUG_URL }}.staging.app.mycompagny.com"
- name: Deploy dummy application using slug in the 'resource path' part
run: |
./deploy-application.sh --url "https://staging.app.mycompagny.com/${{ env.<GITHUB_VARIABLE>_SLUG }}"
```