collective.recipe.omelette 0.1

Introduction

Namespace packages offer the huge benefit of being able to distribute parts of a large system in small, self-contained pieces. However, they can be somewhat clunky to navigate, since you end up with a large list of eggs in your egg cache, and then a seemingly endless series of directories you need to open to actually find the contents of your egg.

This recipe sets up a directory structure that mirrors the actual python namespaces, with symlinks to the egg contents. So, instead of this…:

egg-cache/
    my.egg.one-1.0-py2.4.egg/
        my/
            egg/
                one/
                    (contents of first egg)
    my.egg.two-1.0-py2.4.egg/
        my/
            egg/
                two/
                    (contents of second egg)

…you get this:

omelette/
    my/
        egg/
            one/
                (contents of first egg)
            two/
                (contents of second egg)

Caveat 1: Don’t try to manually add any eggs to the omelette!

Caveat 2: This only works with filesystems that support symlinks (so no go on Windows).

Supported options

The recipe supports the following options:

eggs

List of eggs which should be included in the omelette.

Example usage

Usage is pretty basic. The following installs a buildout and omelette featuring the setuptools egg (for the sake of example, since it has no dependencies):

>>> write('buildout.cfg',
... """
... [buildout]
... eggs = setuptools
... parts = omelette
...
... [omelette]
... recipe = collective.recipe.omelette
... eggs = ${buildout:eggs}
... """)

Running the buildout gives us:

>>> print system(buildout)
Upgraded:
...
Installing omelette.
<BLANKLINE>

Now we have an easily navigable link:

>>> import os
>>> os.path.exists('parts/omelette/setuptools')
True

And it points to the real location of the egg’s contents:

>>> os.readlink('parts/omelette/setuptools')
'/sample-buildout/eggs/setuptools-....egg/setuptools'

If we call the part something else, the omelette should be created there instead (and the old one removed):

>>> write('buildout.cfg',
... """
... [buildout]
... eggs = setuptools
... parts = frittata
...
... [frittata]
... recipe = collective.recipe.omelette
... eggs = ${buildout:eggs}
... """)
>>> print system(buildout)
Uninstalling...
>>> os.path.exists('parts/omelette')
False
>>> os.path.exists('parts/frittata')
True

Reporting bugs or asking questions

There is a shared bugtracker and help desk on Launchpad: https://bugs.launchpad.net/collective.buildout/