Jenkins X Release Version

This is a simple and standalone binary that can be used in CD pipelines to calculate the next release version.

By default it:

• retrieves the previous version - which is the latest git tag matching the semver spec
• use conventional commits to calculate the next release version
• print the next release version to the standard output using a specific format

But it also supports other strategies to read the previous version and calculate the next version.

Optionally, you can also create a tag - and push it to a remote git repository.

Usage

Just run jx-release-version in your project's top directory, and it should just print the next release version. It won't write anything to disk.

It accepts the following CLI flags:

• -dir: the location on the filesystem of your project's top directory - default to the current working directory.
• -previous-version: the strategy to use to read the previous version. Can also be set using the PREVIOUS_VERSION environment variable. Default to auto.
• -commit-headlines: the commit headlines to use to generate the next semantic version. Can also be set using the COMMIT_HEADLINES environment variable. Default to ``.
• -next-version: the strategy to use to calculate the next version. Can also be set using the NEXT_VERSION environment variable. Default to auto.
• -output-format: the output format of the next release version. Can also be set using the OUTPUT_FORMAT environment variable. Default to {{.Major}}.{{.Minor}}.{{.Patch}}.
• -tag: if enabled, a new tag will be created. Can also be set using the TAG environment variable with the "TRUE" value.
• -tag-prefix: the prefix for the new tag - prefixed before the output. Can also be set using the TAG_PREFIX environment variable. Default to "v".
• -push-tag: if enabled, the new tag will be pushed to the origin remote. Can also be set using the PUSH_TAG environment variable. Default to true.
• -fetch-tags: if enabled, the tags will be fetched from the origin remote, before detecting the previous version. Can also be set using the FETCH_TAGS environment variable.
• -git-user: the name of the author/committer used to create the git tag. Can also be set using the GIT_NAME environment variable. Default to the value set in the git config.
• -git-email: the email of the author/committer used to create the git tag. Can also be set using the GIT_EMAIL environment variable. Default to the value set in the git config.
• -debug: if enabled, will print debug logs to stdout in addition to the next version. It can also be enabled by setting the JX_LOG_LEVEL environment variable to debug.

Features

• standalone - no dependencies required. It uses an embedded git implementation to read the Git repository's information.
• simple configuration through CLI flags or environment variables.
• by default works even on an empty git repository.
• multiple strategies to read the previous version and/or calculate the next version.
• custom output format.
• create (and push) a git tag for the new version.
• github action.

Reading the previous version

There are different ways to read the previous version:

Auto

The auto strategy is the default one. It tries to find the latest git tag, or if there are no git tags, it just use 0.0.0 as the previous version.

Usage:

• jx-release-version -previous-version=auto
• jx-release-version - the auto strategy is already the default one

From tag

The from-tag strategy uses the latest git tag as the previous version. Note that it only uses tags which matches the semver spec - other tags are just ignored.

Optionally, it can filter tags based on a given pattern: if you use from-tag:v1 it will use the latest tag matching the v1 pattern. Note that it uses Go's stdlib regexp - you can see the syntax. This feature can be used to maintain 2 major versions in parallel: for each, you just configure the right pattern, so that jx-release-version retrieves the right previous version, and bump it as it should.

Optionally, it can fetch the tags from a remote repository named origin, if you set the -fetch-tags flag, or the FETCH_TAGS environment variable to true. It will fetch the tags before trying to find the previous version.

Note that if it can't find a tag, it will fail.

Usage:

• jx-release-version -previous-version=from-tag
• jx-release-version -previous-version=from-tag:v1

From file

The from-file strategy will read the previous version from a file. Supported formats are:

• Helm Charts, using the Chart.yaml file
• Makefile, using the Makefile file
• Automake, using the configure.ac file
• CMake, using the CMakeLists.txt file
• Python, using the setup.py file
• Maven, using the pom.xml file
• Javascript, using the package.json file
• Gradle, using the build.gradle, build.gradle.kts or gradle.properties file

Usage:

• if you use jx-release-version -previous-version=from-file it will auto detect which file to use, trying the supported formats in the order in which they are listed. If a "format" supports multiple files (such as Gradle), it will try to read the version from each file - in the order in which they are listed.
• if you specify a file, it will use it to find the previous version. For example:
  • jx-release-version -previous-version=from-file:pom.xml
  • jx-release-version -previous-version=from-file:charts/my-chart/Chart.yaml
  • jx-release-version -previous-version=from-file:Chart.yaml -dir=charts/my-chart

Manual

The manual strategy can be used if you already know the previous version, and just want jx-release-version to use it.

Usage:

• jx-release-version -previous-version=manual:1.2.3
• jx-release-version -previous-version=1.2.3 - the manual prefix is optional

Calculating the next version

There are different ways to calculate the next version:

Auto

The auto strategy is the default one. It tries to use the semantic strategy, but if it can't find a tag for the previous version, it will fallback to incrementing the patch component.

Usage:

• jx-release-version -next-version=auto
• jx-release-version - the auto strategy is already the default one

Semantic release

The semantic strategy finds all commits between the previous version's git tag and the current HEAD, and then uses conventional commits to parse them. If it finds:

• at least 1 commit with a BREAKING CHANGE: footer, then it will bump the major component of the version
• at least 1 commit with a feat: prefix, then it will bump the minor component of the version
• otherwise it will bump the patch component of the version

Note that if it can't find a tag for the previous version, it will fail, except if you use the -commit-headlines flags to generate semantic next version from a single/multiline string instead of repository commits/tags.

Usage:

• jx-release-version -next-version=semantic
• if you want to strip any prerelease information from the build before performing the version bump you can use:
  • jx-release-version -next-version=semantic:strip-prerelease

Pass commit headlines

If you want to retrieve a semantic version without using tags or commits from a repository, you can manually set the previous version and the commit headlines to use:

• jx-release-version -previous-version=1.2.3 -commit-headlines="feat: a feature"

From file

The from-file strategy will read the next version from a file. Supported formats are:

• Helm Charts, using the Chart.yaml file
• Makefile, using the Makefile file
• Automake, using the configure.ac file
• CMake, using the CMakeLists.txt file
• Python, using the setup.py file
• Maven, using the pom.xml file
• Javascript, using the package.json file
• Gradle, using the build.gradle, build.gradle.kts or gradle.properties file

Usage:

• if you use jx-release-version -next-version=from-file it will auto detect which file to use, trying the supported formats in the order in which they are listed. If a "format" supports multiple files (such as Gradle), it will try to read the version from each file - in the order in which they are listed.
• if you specify a file, it will use it to find the next version. For example:
  • jx-release-version -next-version=from-file:pom.xml
  • jx-release-version -next-version=from-file:charts/my-chart/Chart.yaml
  • jx-release-version -next-version=from-file:Chart.yaml -dir=charts/my-chart

Increment

The increment strategy can be used if you want to increment a specific component of the version.

Usage:

• jx-release-version -next-version=increment:major
• jx-release-version -next-version=increment:minor
• jx-release-version -next-version=increment:patch
• jx-release-version -next-version=increment - by default it will increment the patch component

Manual

The manual strategy can be used if you already know the next version, and just want jx-release-version to use it.

Usage:

• jx-release-version -next-version=manual:1.2.3
• jx-release-version -next-version=1.2.3 - the manual prefix is optional

Output format

The output format of the next release version can be defined using a Go template:

• the template has access to the Version object - so you can use fields such as:
  • Major
  • Minor
  • Patch
  • Prerelease
  • Metadata
  • String
  • Original
• the default format is: {{.Major}}.{{.Minor}}.{{.Patch}}
• you can also use the sprig functions

Usage:

• jx-release-version -output-format=v{{.Major}}.{{.Minor}} - if you only want major/minor
• jx-release-version -output-format={{.String}} - if you want the full version with prerelease / metadata information, if these are set in a file for example

Tag

Most of the time, you'll be using the jx-release-version tool as part of your CD pipelines, so you'll want to do something with the "next version", such as creating (and pushing) a git tag. This behavior is disabled by default, but can easily be enabled by setting the -tag CLI flag - or alternatively setting the TAG environment variable to "true".

If the next version is 1.2.3 for example, by default a new tag named v1.2.3 will be created. You can control the prefix using the -tag-prefix CLI flag - or alternatively by setting the TAG_PREFIX environment variable.

If you want to override the name/email of the author/committer used to create the git tag, you can set the -git-user / -git-email CLI flags, or alternatively the GIT_NAME / GIT_EMAIL environment variables.

Pushing

Creating a new (local) tag is great, but for it to be useful, you will also need to push it to a remote git repository. By default, when the new tag is created, it will also be pushed automatically to the origin remote.

Note that this operation might requires authentication - which you can provide using the GIT_TOKEN environment variable.

Integrations

Tekton Pipelines

If you want to use jx-release-version in your Tekton pipeline, you can add a step in your Task which writes the output of the jx-release-version command to a file, such as:

steps:
- image: ghcr.io/jenkins-x/jx-release-version:2.7.8
  name: next-version
  script: |
    #!/usr/bin/env sh
    jx-release-version > VERSION

GitHub Actions

If you want to use jx-release-version in your GitHub Workflow, you can add the following to your workflow file:

jobs:
  yourjob:
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
          token: ${{ secrets.GIT_BOT_TOKEN }}
      - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*

      - id: nextversion
        name: next release version
        uses: jenkins-x-plugins/[email protected]

      - name: do something with the next version
        run: echo next version is $VERSION
        env:
          VERSION: ${{ steps.nextversion.outputs.version }}

Or to create a new tag and push it, you can:

• use the fregante/setup-git-user action to setup the git name/email to the github-actions bot
  • if you want to use a specific user, you can set the git-user and git-email parameters
• set the tag and github-token parameters

jobs:
  yourjob:
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0
          token: ${{ secrets.GIT_BOT_TOKEN }}
      - run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
      - uses: fregante/setup-git-user@v1

      - name: tag
        id: tag
        uses: jenkins-x-plugins/[email protected]
        with:
          tag: true
          github-token: ${{ secrets.GIT_BOT_TOKEN }}

      - name: do something with the next version
        run: echo next version is $VERSION
        env:
          VERSION: ${{ steps.tag.outputs.version }}