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distutils/packaging-related utilities used by some of STScI's packages

Project description

Introduction

This package contains utilities used to package some of STScI’s Python projects; specifically those projects that comprise stsci_python and Astrolib.

It currently consists mostly of some setup_hook scripts meant for use with distutils2/packaging and/or d2to1, and a customized easy_install command meant for use with distribute.

This package is not meant for general consumption, though it might be worth looking at for examples of how to do certain things with your own packages, but YMMV.

Features

Hook Scripts

Currently the main features of this package are a couple of setup_hook scripts. In distutils2, a setup_hook is a script that runs at the beginning of any pysetup command, and can modify the package configuration read from setup.cfg.

stsci.distutils.hooks.use_packages_root

If using the packages_root option under the [files] section of setup.cfg, this hook will add that path to sys.path so that modules in your package can be imported and used in setup. This can be used even if packages_root is not specified–in this case it adds ‘’ to sys.path.

stsci.distutils.hooks.glob_data_files

Allows filename wildcards as understood by glob.glob() to be used in the data_files option. This hook must be used in order to have this functionality since it does not normally exist in distutils.

stsci.distutils.hooks.svn_info_pre_hook

This hook is best used as a pre-hook for the build_py and sdist commands. It creates a Python module called svninfo.py which contains three variables: __svn_version__ (the SVN revision info as returned by the svnversion command), __full_svn_info__ (as returned by the svn info command), and __setup_datetime__ (the date and time that setup.py was last run). These variables can be imported in the __init__.py package for degugging purposes. The svninfo.py module will only be created in a package that imports from svninfo in its __init__.py.

stsci.distutils.hooks.svn_info_post_hook

The complement to svn_info_pre_hook. This will delete any svninfo.py files created during a build in order to prevent them from cluttering an SVN working copy (note, however, that svninfo.py is not deleted from the build/ directory, so a copy of it is still preserved). It will also not be deleted if the current directory is not an SVN working copy. For example, if source code extracted from a source tarball it will be preserved.

stsci.distutils.hooks.numpy_extension_hook

This is a pre-command hook for the build_ext command. To use it, add a [build_ext] section to your setup.cfg, and add to it:

pre-hook.numpy-extension-hook = stsci.distutils.hooks.numpy_extension_hook

This hook must be used to build extension modules that use Numpy. The primary side-effect of this hook is to add the correct numpy include directories to include_dirs. To use it, add ‘numpy’ to the ‘include-dirs’ option of each extension module that requires numpy to build. The value ‘numpy’ will be replaced with the actual path to the numpy includes.

stsci.distutils.hooks.is_display_option

This is not actually a hook, but is a useful utility function that can be used in writing other hooks. Basically, it returns True if setup.py was run with a “display option” such as –version or –help. This can be used to prevent your hook from running in such cases.

Commands

Currently one custom command is included: stsci.distutils.command.easier_install. This is meant as a replacement for the distribute/setuptools easy_install command. It works exactly the same way, but includes a new feature: Local source directories can be searched for package dependencies.

The directories to search can be specified by adding them to the find-links option in the [easy_intall] section of setup.cfg. Though find-links can already be used to point to egg files or source tarfiles on the local filesystem, this adds the ability to point to existing source checkouts to search for dependencies.

Currently this only supports source distributions that have their package metadata in setup.cfg (distutils2 style), but this could be extended to support other more common distribution styles. For example, checking for EGG-INFO, or even calling setup.py egg_info and using that to determine whether or not a source checkout matches some requirement.

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