On 9/24/07, Jim Fulton <jim@zope.com> wrote:
Or would it require the recipe writer to explicitly 'subclass' (?) cmmi to get patch functionality?
I prefer composition. A number of recipes reuse the egg recipe through composition.
Generally, an egg will need to explicitly provide a Python API for other eggs. See, for example, http://pypi.python.org/pypi/ zc.recipe.egg/1.0.0b6#egg-recipe-api-for-other-recipes
Gotcha, that makes sense.
Or even, would a 'post-fetch'/'pre-build' generalization be desired, 'patch' being one such application?
I have no idea what that is. :)
My intent is: "Given any recipe, no matter where data is coming from (be it an egg in PyPI, a Subversion checkout or a tarball), I would like to be able to perform an operation in the 'local copy' of the data, without depending on the person that wrote the recipe to have allowed me to do so" An example being, after a recipe that does a Subversion checkout runs, my custom operation kicks in and applies a patch to the local copy before the buildout processing continues. I believe that this might be doable today by writing custom configuration, but maybe it's such a common case that could be simplified. Maybe something along the lines of (note: this is all pseudo-config): """ [Step1] recipe = some.recipe.checkout url = svn://url-to-repo/package [Step2] recipe = zc.recipe.cmmi source = {Step1:location} patch = /path/to/my/patch [zope2] products = {Step2:location} """ I believe that something like this might already work today, if not it might be easy to make it work that way. But what I'm after is to avoid Step2 above by listing the patch to be applied in Step1 even if 'some.recipe.checkout' does not support the 'patch' option directly. All in all, if you tell me that the hypotetical Step2 above really can't be avoided and that the best option is to make 'some.recipe.checkout' and any other recipes out support the 'patch' option directly, I would be fine with that too. Does it make more sense now? -- Sidnei da Silva Enfold Systems http://enfoldsystems.com Fax +1 832 201 8856 Office +1 713 942 2377 Ext 214