[Zope-CMF] Re: GenericSetup extension profile import step mis-feature

[yuppie]

Hi!


Rob Miller wrote:
> i'm pretty much in support of the proposal as it's evolved so far.  

I'm not.

> here's my understanding of it at this point:
> 
> - the import step registry will record the profile from which a given 
> import step is included.  if multiple profiles include the same step in 
> their import_steps.xml, they will both be recorded as related to that 
> import step.

What means "same step"? Step with same handler, same ID, same version, 
same title or same description? I guess you mean same handler, but what 
about the other metadata? Which profile has the 'right' metadata?

> - when a profile is imported, only the import steps from the base 
> profile and all transitively dependent profiles will be run.  (clearly 
> this depends on actually finishing the dependency support.)
> 
> - when a profile is exported (or a snapshot is generated), all of the 
> registered steps will be used.
> 
> this way, a naively coded import handler can only cause a problem when 
> the profile it is associated with (or any other profile that explicitly 
> depends on the problematic profile) is run.  writing imperative handlers 
> should still be discouraged, but the damage that they can cause is 
> contained.

I'd prefer it if naively coded import handlers always cause problems - 
this way the problems are easily identified and fixed.


A global handler registry is *much* simpler. It allows to remove a lot 
of code instead of making things even more complex than they already are.


Cheers,

	Yuppie