Design and Scope - installer

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# Design and Scope

## What this is for

This project is born out of this discussion. Effectively, the volunteers who maintain the Python Packaging toolchain identified a need for a library in the ecology that handles the details of “wheel -> installed package”. This is that library.

There’s also a need for “a fast tool to populate a package into an environment” and this library can be used to build that. This package itself might also “grow” a CLI, to provide just that functionality.

## What is provided

- Abstractions for installation of a wheel distribution.

- Utilities for writing concrete implementations of these abstractions.

- Concrete implementations of these abstraction, for the most common usecase.

- Utilities for handling wheel RECORD files.

- Utilities for generating Python script launchers.