Action Get Latest Tag

This is a GitHub Action to get a latest Git tag.

It would be more useful to use this with other GitHub Actions' outputs.

Inputs

NAME	DESCRIPTION	TYPE	REQUIRED	DEFAULT
semver_only	Whether gets only a tag in the shape of semver. v prefix is accepted for tag names.	bool	false	false
initial_version	The initial version. Works only when inputs.with_initial_version == true.	string	false	v0.0.0
with_initial_version	Whether returns inputs.initial_version as outputs.tag if no tag exists. true and false are available.	bool	false	true

If inputs.semver_only is true, the latest tag among tags with semver will be set for outputs.tag.

This input is useful for versioning that binds a major version is the latest of that major version (e.g., v1 == v1.*), like GitHub Actions. In such a case, the actual latest tag is a major version, but the version isn't as we expected when we want to work with semver.

Let's say you did the following versioning.

$ git tag v1.0.0 && git push origin v1.0.0
$ # some commits...
$ git tag v1.1.0 && git push origin v1.1.0
$ git tag v1 && git push origin v1 # bind v1 to v1.1.0.

In such a case, outputs.tag varies like this:

• inputs.semver_only=false -> outputs.tag=v1
• inputs.semver_only=true -> outputs.tag=v1.1.0

Outputs

NAME	DESCRIPTION	TYPE
tag	The latest tag. If no tag exists and inputs.with_initial_version == false, this value is ''.	string

Example

name: Push a new tag with Pull Request

on:
  pull_request:
    types: [closed]

jobs:
  release:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2

      - uses: actions-ecosystem/action-release-label@v1
        id: release-label
        if: ${{ github.event.pull_request.merged == true }}

      - uses: actions-ecosystem/action-get-latest-tag@v1
        id: get-latest-tag
        if: ${{ steps.release-label.outputs.level != null }}

      - uses: actions-ecosystem/action-bump-semver@v1
        id: bump-semver
        if: ${{ steps.release-label.outputs.level != null }}
        with:
          current_version: ${{ steps.get-latest-tag.outputs.tag }}
          level: ${{ steps.release-label.outputs.level }}

      - uses: actions-ecosystem/action-push-tag@v1
        if: ${{ steps.release-label.outputs.level != null }}
        with:
          tag: ${{ steps.bump-semver.outputs.new_version }}
          message: '${{ steps.bump-semver.outputs.new_version }}: PR #${{ github.event.pull_request.number }} ${{ github.event.pull_request.title }}'

For a further practical example, see .github/workflows/release.yml.

License

Copyright 2020 The Actions Ecosystem Authors.

Action Get Latest Tag is released under the Apache License 2.0.