[issue14950] Make packaging.install API less confusing and more extensible

[Éric Araujo]

Changes by Éric Araujo :


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resolution:  -> out of date
stage:  -> committed/rejected
status: open -> closed

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[issue14950] Make packaging.install API less confusing and more extensible

[Alexis Metaireau]

Alexis Metaireau  added the comment:

Attaching a work in progress file which intend to replace the current 
install.py file. The implementation isn't finished yet but the overall design 
is here.

It comes with four classes:

- Installer which manages the overall installation procedure. It shares a 
distribution cache with the dependency handler so distributions are not 
downloaded / extracted multiple times. The installer is able to install / 
remove single distributions OR distributions with their dependency tree.
- DependencyHandler which takes care about getting the dependencies from either 
the metadata stored in the indexes or inside the distirbutions.
- The DistributionCache class is just a store containing the location of the 
distributions that had been extracted/downloaded. It provides methods to ease 
the work with them (so any external user don't need to care about the state of 
the distribution when requesting it).
- DirectoryMover provides a way to deal with moving/deleting operations with a 
commit/rollback API. The goal is to simplify a lot the current API and to 
provide a reusable tool for other installers. why not putting this in shutil at 
some point.

This file is provided here mostly for feedback, but the work is not finished 
yet.

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Added file: http://bugs.python.org/file25831/install.py

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[issue14950] Make packaging.install API less confusing and more extensible

[Éric Araujo]

Éric Araujo  added the comment:

BTW I suggest you work off a d2 checkout; I have not ported all changes from 
Montreal sprints to cpython/p7g at the moment.

--
title: packaging.install does not have a clear API. -> Make packaging.install 
API less confusing and more extensible

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