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Built-in Pipelines

Melange provides several built-in pipelines to facilitate the process of building packages for popular ecosystems, such as Python, Perl, and Maven.

How built-in pipelines are located

Pipelines are invoked in Melange builds by their file path. All built-in pipelines are located in the pkg/build/pipelines directory. Therefore, to consume a pipeline that has a file name of fetch.yaml and is located in the sample folder, the syntax in your Melange YAML would be:

...
pipeline:
  - uses: sample/fetch

Creating new built-in pipelines

New pipelines can be created by adding YAML files to the pkg/build/pipelines directory. Melange needs to be rebuilt before the new pipelines become available. For local tests, you can install a development version of Melange using go install . in the root directory. For CI builds, it is necessary to bump the melange dependency in wolfictl.

Bump the Melange dependency on wolfictl

To bump the Melange dependency on wolfictl:

  1. Fork and clone the wolfi-dev/wolfictl repository locally.
  2. From the root of the repository, run the following commands: 
    go get chainguard.dev/melange@main
go mod tidy
  3. Submit a pull request with your changes.
  4. A new image with your updated version will be created when the image creation workflow runs again.

Ecosystem-specific pipeline documentation