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Create a Meta Buildpack

Conveniently build a Meta Buildpack project through Packer with almost no need to modify the code.

This article will take the Leo smart contract as an example to introduce how to create a Meta Buildpack.

A Meta Buildpack is a special type of buildpack that can aggregate multiple other buildpack collections.

To comply with the Buildpacks specification, creating a Meta Buildpack requires you to write a buildpack.toml file listing the names of multiple other buildpacks.

Overall Process

Here are the steps to initialize a Meta Buildpack:

  1. Create a Meta Buildpack configuration file named config.toml.

  2. In the config.toml file, specify the buildpack dependencies you wish to combine, for example:

repo = "amp-buildpacks/leo-dist"
version = "0.1.6"

repo = "amp-buildpacks/aleo"
version = "0.1.10"
  1. Use the Packer CLI tool to initialize your Meta Buildpack project.

  2. Run the official pack build command to build your Meta Buildpack.

Initializing the Project

1. Create the project and corresponding folders directly

packer init -t meta -c config.toml leo

2. Use in an empty folder

First, go into an empty folder, then run:

cd leo
packer init -t meta -c config.toml

3. Force overwrite an existing project

If you wish to overwrite an existing project, you can use the following command:

packer init -t meta -f -c config.toml leo

Please note that using the -f option will forcefully overwrite the existing project and all its contents. Before performing this operation, make sure you have fully backed up the project in case of any unforeseen issues.

This will complete the creation of the leo Meta Buildpack project.

Check the project file tree, and you will find the following related files have been automatically created.

> tree .github .
├── pipeline-descriptor.yml
└── workflows
    └── pb-update-pipeline.yml
├── buildpack.toml
└── package.toml