Wednesday, October 1st, 2008

pyinstall pybundles

Update: pyinstall has been renamed to pip (per the suggestions in the comments to this post)

I added pybundles to pyinstall very shortly before I announced pyinstall. I hadn’t actually tried it out that much. Since then I’ve made three more minor releases of pyinstall, and I think the bundle support is working pretty decently.

A .pybundle file is just a bunch of source code, all the source code you need to install some package(s). For instance, for Deliverance I’ve created a bundle file so you can do:

$ easy_install pyinstall virtualenv
$ pyinstall.py -E DeliveranceTest/ \\
>   http://deliverance.openplans.org/dist/Deliverance-snapshot-latest.pybundle

This creates a virtualenv environment in DeliveranceTest/, unpacks all the source from the bundle, and installs all of it. It’s not magical — it still has to compile the source and move the files around — but it does mean just a single download, and the versions of everything that is installed aren’t going to change unless that bundle file is regenerated.

I’ve been thinking about some other features for pybundles, like post installation scripts. All of this has raised a problem though: pyinstall needs to be a two-level command, with commands like:

pyinstall.py install X pyinstall.py bundle Y pyinstall.py freeze req.txt and of course the not-yet-implemented: pyinstall.py remove Z

But pyinstall.py install does not read well. It’s not too late to rename the package (yet again), or just rename the script. Ideas?

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