collective.recipe.omelette 0.4

Creates a unified directory structure of all namespace packages, symlinking to the actual contents, in order to ease navigation.

Code repository: http://svn.plone.org/svn/collective/buildout/collective.recipe.omelette/trunk

Change history

0.4 (2008-04-07)

• Added option to include Products directories. [davisagli]
• Fixed ignore-develop option. [davisagli]

0.3 (2008-03-30)

• Fixed test infrastructure. [davisagli]
• Added option to ignore develop eggs [claytron]
• Added option to ignore eggs [claytron]
• Added option to override the default omelette location. [davisagli]

0.2 (2008-03-16)

• Fixed so created directories are not normalized to lowercase. [davisagli]

0.1 (2008-03-10)

• Initial basic implementation. [davisagli]
• Created recipe with ZopeSkel. [davisagli]

Detailed Documentation

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.

location

(optional) Override the directory in which the omelette is created (default is parts/[name of buildout part])

ignore-develop

(optional) Ignore eggs that you are currently developing (listed in ${buildout:develop}). Default is False

ignores

(optional) List of eggs to ignore when preparing your omelette.

products

(optional) List of old Zope 2-style products directories whose contents should be included in the omelette, in a directory called Products.

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)
Installing omelette.
<BLANKLINE>

Now we have an easily navigable link:

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

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

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

You can also include old-style Products directories in the omelette (for Zope developers):

>>> write('buildout.cfg',
... """
... [buildout]
... parts =
...     productdistros
...     omelette
...
... [productdistros]
... recipe = plone.recipe.distros
... urls = http://plone.org/products/pressroom/releases/3.1/pressroom-3-1.tgz
...
... [omelette]
... recipe = collective.recipe.omelette
... products =
...     ${productdistros:location}
...     ${buildout:directory}/duplicate-product-test
... """)
>>> mkdir('duplicate-product-test')
>>> mkdir('duplicate-product-test/PressRoom')
>>> print system(buildout + ' -q')

Any subdirectories of the products directories will be added to the omelette:

>>> ls('parts/omelette/Products')
d PressRoom

If a subdirectory of the same name appears in two different product directories, the first one encountered will take precedence:

>>> os.readlink('parts/omelette/Products/PressRoom')
'/sample-buildout/parts/productdistros/PressRoom'

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 + ' -q')
>>> os.path.exists('parts/omelette')
False
>>> os.path.exists('parts/frittata')
True

You can also override the location of the omelette if you want to put it somewhere else entirely:

>>> write('buildout.cfg',
... """
... [buildout]
... eggs = setuptools
... parts = omelette
...
... [omelette]
... recipe = collective.recipe.omelette
... eggs = ${buildout:eggs}
... location = ${buildout:directory}/omelette
... """)
>>> print system(buildout + ' -q')
>>> os.path.exists('omelette')
True

You can ignore a particular package:

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

Or ignore all development eggs:

>>> write('buildout.cfg',
... """
... [buildout]
... eggs = collective.recipe.omelette
... parts = omelette
...
... [omelette]
... recipe = collective.recipe.omelette
... eggs = ${buildout:eggs}
... ignore-develop = true
... """)
>>> print system(buildout + ' -q')
>>> ls('parts/omelette')
d setuptools
d zc

Running the tests

The subversion checkout of collective.recipe.omelette includes a buildout which installs a script for running the tests.

Just run::

python2.4 bootstrap.py bin/buildout bin/test

Known issue: The tests run buildout in a separate process, so it’s currently impossible to put a pdb breakpoint in the recipe and debug during the test. If you need to do this, set up another buildout which installs an omelette part and includes collective.recipe.omelette as a development egg.

Reporting bugs or asking questions

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

Contributors

• David Glick [davisagli], Author
• Clayton Parker [claytron], Code Monkey

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