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# Rattler: Rust crates for fast handling of conda packages
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[pixi-url]: https://pixi.sh
Rattler is a library that provides common functionality used within the conda ecosystem ([what is conda & conda-forge?](#what-is-conda--conda-forge)).
The goal of the library is to enable programs and other libraries to easily interact with the conda ecosystem without being dependent on Python.
Its primary use case is as a library that you can use to provide conda related workflows in your own tools.
Rattler is written in Rust and tries to provide a clean API to its functionalities (see: [Components](#components)).
With the primary goal in mind we aim to provide bindings to different languages to make it easy to integrate Rattler in non-rust projects.
Rattler is actively used by [pixi](https://github.com/prefix-dev/pixi), [rattler-build](https://github.com/prefix-dev/rattler-build), and the https://prefix.dev backend.
## Showcase
This repository also contains a binary (use `cargo run` to try) that shows some of the capabilities of the library.
This is an example of installing an environment containing `cowpy` and all its dependencies _from scratch_ (including Python!):
## Give it a try!
Before you begin, make sure you have the following prerequisites:
- A recent version of [git](https://git-scm.com/book/en/v2/Getting-Started-Installing-Git)
- A recent version of [pixi](https://github.com/prefix-dev/pixi)
Follow these steps to clone, compile, and run the rattler project:
```shell
# Clone the rattler repository along with its submodules:
git clone --recursive https://github.com/conda/rattler.git
cd rattler
# Compile and execute rattler to create a JupyterLab instance:
pixi run rattler create jupyterlab
```
The above command will execute the `rattler` executable in release mode.
It will download and install an environment into the `.prefix` folder that contains [`jupyterlab`](https://jupyterlab.readthedocs.io/en/stable/getting_started/overview.html) and all the dependencies required to run it (like `python`)
Run the following command to start jupyterlab:
```shell
# on windows
.\.prefix\Scripts\jupyter-lab.exe
# on linux or macOS
./.prefix/bin/jupyter-lab
```
Voila!
You have a working installation of jupyterlab installed on your system!
You can of course install any package you want this way.
Try it!
## Contributing 😍
We would love to have you contribute!
See the CONTRIBUTION.md for more info. For questions, requests or a casual chat, we are very active on our discord server.
You can [join our discord server via this link][chat-url].
## Components
Rattler consists of several crates that provide different functionalities.
* **rattler_conda_types**: foundational types for all datastructures used within the conda eco-system.
* **rattler_package_streaming**: provides functionality to download, extract and create conda package archives.
* **rattler_repodata_gateway**: downloads, reads and processes information about existing conda packages from an index.
* **rattler_shell**: code to activate an existing environment and run programs in it.
* **rattler_solve**: a backend agnostic library to solve the package satisfiability problem.
* **rattler_virtual_packages**: a crate to detect system capabilities.
* **rattler_index**: create local conda channels from local packages.
* **rattler**: functionality to create complete environments from scratch using the crates above.
* **rattler-lock**: a library to create and parse lockfiles for conda environments.
* **rattler-networking**: common functionality for networking, like authentication, mirroring and more.
* **rattler-bin**: an example of a package manager using all the crates above (see: [showcase](#showcase))
You can find these crates in the `crates` folder.
Additionally, we provide Python bindings for most of the functionalities provided by the above crates.
A python package `py-rattler` is available on [conda-forge](https://prefix.dev/channels/conda-forge/packages/py-rattler) and [PyPI](https://pypi.org/project/py-rattler/).
Documentation for the python bindings can be found [here](https://conda.github.io/rattler/py-rattler).
## What is conda & conda-forge?
The conda ecosystem provides **cross-platform**, **binary** packages that you can use with **any programming language**.
`conda` is an open-source package management system and environment management system that can install and manage multiple versions of software packages and their dependencies.
`conda` is written in Python.
The aim of Rattler is to provide all functionality required to work with the conda ecosystem from Rust.
Rattler is not a reimplementation of `conda`.
`conda` is a package management tool.
Rattler is a _library_ to work with the conda ecosystem from different languages and applications.
For example, it powers the backend of https://prefix.dev.
`conda-forge` is a community-driven effort to bring new and existing software into the conda ecosystem.
It provides _tens-of-thousands of up-to-date_ packages that are maintained by a community of contributors.
For an overview of available packages see https://prefix.dev.