GitHub auto-versioning post-processing

You can delegate the post-processing to a GitHub workflow.

There is a global configuration, and there are a specific configuration at the branch level (in the postProcessingConfig parameter).

For the global configuration, you can go to Settings > GitHub Auto Versioning Post Processing and define the following attributes:

Configuration - Default GitHub configuration to use for the connection
Repository - Default repository (like owner/repository) containing the workflow to run
Workflow - Name of the workflow containing the post-processing (like post-processing.yml)
Branch - Branch to launch for the workflow
Retries - The amount of times we check for successful scheduling and completion of the post-processing job
Retry interval - The time (in seconds) between two checks for successful scheduling and completion of the post-processing job

The postProcessingConfig property at the branch level must contain the following parameters:

Parameter	Default value	Description
`dockerImage`	Required	This image defines the environment for the upgrade command to run in
`dockerCommand`	Required	Command to run in the Docker container
`commitMessage`	Required	Commit message to use to commit and push the result of the post-processing
`config`	Optional	GitHub configuration to use for the connection, using the defaults if not specified
`repository`	Optional	GitHub repository (`owner/repo`), to override the default settings
`branch`	Optional	Branch to use when launching the workflow, to override the default settings
`workflow`	Optional	Name of the workflow containing the post-processing (like `post-processing.yml`), to override the defaults
`parameters`	Optional	List of extra inputs to pass to the workflow (see below)

The dockerImage, dockerCommand and commitMessage parameters, and every parameters value, are templated using the auto-versioning templating context. For example:

commitMessage: "Upgrading to ${VERSION}"

The workflow branch configuration property can be used to set the post-processing workflow to one in the very branch targeted by the auto versioning process. This would override the global settings.

Example of a simple configuration relying on the global settings:

postProcessing: github
postProcessingConfig:
    dockerImage: openjdk:11
    dockerCommand: ./gradlew dependencies --write-locks
    commitMessage: "Resolving the dependency locks"

Transient failures

The call starting the workflow is made up to three times in a row, waiting 2 then 4 seconds, when GitHub answers with a 502, 503 or 504 HTTP error, or when Yontrack cannot connect to GitHub. Any other error, like a 4xx, is not retried, and neither is a read timeout: GitHub has then most likely started the workflow already.

Note

GitHub may answer with an error after having actually accepted the start of the workflow. Retrying the call may then start the workflow twice. Yontrack still identifies the run it has started through a unique ID passed to the workflow, but the other run goes on.

Once started, the workflow run is looked up in the list of runs of the repository, as many times as the Retries setting says and with its Retry interval between two attempts.

A client error (4xx) while looking for the run, like a missing permission, fails the post-processing right away.

If the call still fails after its three attempts, or if the run cannot be found in time, the post-processing fails on a transient error: the whole auto-versioning request can then be retried automatically, if enabled.

Warning

When the run of the workflow cannot be found in time, it may still exist and complete later, pushing to the upgrade branch while the automatic retry recreates it. The delay before an automatic retry makes this unlikely.

A workflow run which completes without success, or which does not complete in time, is a final failure and is never retried automatically.

Extra parameters

On top of the inputs Yontrack always sends, arbitrary inputs can be passed to the workflow:

postProcessing: github
postProcessingConfig:
    dockerImage: openjdk:11
    dockerCommand: ./gradlew dependencies --write-locks
    commitMessage: "Resolving the dependency locks"
    parameters:
      - name: source_release
        value: ${sourceBuild.release}

Each value is templated. An extra parameter using the name of a built-in input overrides it.

Warning

Every input passed to the workflow — including the extra parameters — must be declared in the workflow's workflow_dispatch.inputs section, otherwise GitHub rejects the dispatch.

Workflow inputs

Yontrack launches the workflow with the following inputs:

Input	Description
`id`	Unique client ID generated by Yontrack to identify the workflow run it has launched
`repository`	Repository to process, like `yontrack/yontrack`
`upgrade_branch`	Branch containing the changes to process
`docker_image`	This image defines the environment for the upgrade command to run in
`docker_command`	Command to run in the Docker container
`commit_message`	Commit message to use to commit and push the result of the post-processing
`version`	The version which is upgraded to

The code below shows an example of a workflow suitable for post-processing:

name: post-processing

on:
  # Manual trigger only
  workflow_dispatch:
    inputs:
      id:
        description: "Unique client ID"
        required: true
        type: string
      repository:
        description: "Repository to process, like 'yontrack/yontrack'"
        required: true
        type: string
      upgrade_branch:
        description: "Branch containing the changes to process"
        required: true
        type: string
      docker_image:
        description: "This image defines the environment for the upgrade command to run in"
        required: true
        type: string
      docker_command:
        description: "Command to run in the Docker container"
        required: true
        type: string
      commit_message:
        description: "Commit message to use to commit and push the result of the post processing"
        required: true
        type: string
      version:
        description: "The version which is upgraded to"
        required: true
        type: string

jobs:
  processing:
    runs-on: ubuntu-latest
    container:
      image: ${{ inputs.docker_image }}
    steps:
      - name: logging
        run: |
          touch inputs.properties
      - name: artifact
        uses: actions/upload-artifact@v4
        with:
          name: inputs-${{ inputs.id }}.properties
          path: inputs.properties
          if-no-files-found: error
      - name: checkout
        uses: actions/checkout@v3
        with:
          repository: ${{ inputs.repository }}
          ref: ${{ inputs.upgrade_branch }}
          token: ${{ secrets.YONTRACK_AUTO_VERSIONING_POST_PROCESSING }}
      - name: processing
        run: ${{ inputs.docker_command }}
      - name: publication
        run: |
          git config --local user.email "<some email>"
          git config --local user.name "<some name>"
          git add --all
          git commit -m "${{ inputs.commit_message }}"
          git push origin "${{ inputs.upgrade_branch }}"

Important

all the inputs Yontrack sends must be declared, otherwise GitHub rejects the dispatch
the id input and its output into a local file artifact is required by Yontrack to follow up on the workflow process (the GitHub API does not allow to explicitly retrieve a workflow run when it's launched) - see the generation & archiving of the inputs.properties file in the example above.
commit & pushing the changed files is required for the post-processing to be considered complete

The rest of the workflow can be adapted at will.