jsonnet-bundler

NOTE: This project is alpha stage. Flags, configuration, behavior and design may change significantly in following releases.

The jsonnet-bundler is a package manager for Jsonnet.

Install

go install -a github.com/jsonnet-bundler/jsonnet-bundler/cmd/jb@latest

NOTE: please use a recent Go version to do this, ideally Go 1.13 or greater.

This will put jb in $(go env GOPATH)/bin. If you encounter the error jb: command not found after installation then you may need to add that directory to your $PATH as shown in their docs.

Package Install

Arch Linux AUR
Mac OS X via Homebrew: brew install jsonnet-bundler
Fedora (>= 32): sudo dnf install golang-github-jsonnet-bundler

Features

Fetches transitive dependencies
Can vendor subtrees, as opposed to whole repositories

Current Limitations

Always downloads entire dependent repositories, even when updating
If two dependencies depend on the same package (diamond problem), they must require the same version

Example Usage

Initialize your project:

mkdir myproject
cd myproject
jb init

The existence of the jsonnetfile.json file means your directory is now a jsonnet-bundler package that can define dependencies.

To depend on another package (another Github repository): Note that your dependency need not be initialized with a jsonnetfile.json. If it is not, it is assumed it has no transitive dependencies.

jb install https://github.com/anguslees/kustomize-libsonnet

Now write myconfig.jsonnet, which can import a file from that package. Remember to use -J vendor when running Jsonnet to include the vendor tree.

local kustomize = import 'kustomize-libsonnet/kustomize.libsonnet';

local my_resource = {
  metadata: {
    name: 'my-resource',
  },
};

kustomize.namePrefix('staging-')(my_resource)

To depend on a package that is in a subtree of a Github repo (this package also happens to bring in a transitive dependency):

jb install https://github.com/prometheus-operator/prometheus-operator/jsonnet/prometheus-operator

Note that if you are copy pasting from the Github website's address bar, remove the tree/master from the path.

If pushed to Github, your project can now be referenced from other packages in the same way, with its dependencies fetched automatically.

All command line flags

$ jb -h
usage: jb [<flags>] <command> [<args> ...]

A jsonnet package manager

Flags:
  -h, --help     Show context-sensitive help (also try --help-long and
                 --help-man).
      --version  Show application version.
      --jsonnetpkg-home="vendor"  
                 The directory used to cache packages in.
  -q, --quiet    Suppress any output from git command.

Commands:
  help [<command>...]
    Show help.

  init
    Initialize a new empty jsonnetfile

  install [<flags>] [<uris>...]
    Install new dependencies. Existing ones are silently skipped

  update [<uris>...]
    Update all or specific dependencies.

  rewrite
    Automatically rewrite legacy imports to absolute ones

Design

This is an implemention of the design specified in this document: https://docs.google.com/document/d/1czRScSvvOiAJaIjwf3CogOULgQxhY9MkiBKOQI1yR14/edit#heading=h.upn4d5pcxy4c

TECHNOFAB11/jsonnet-bundler