Re: [gentoo-alt] portage prefix chaining support

[Markus Duft]

On Fri, 2009-04-03 at 09:04 +0200, Markus Duft wrote:
> On Thu, 2009-04-02 at 22:22 +0200, Fabian Groffen wrote:
> [snip]
[snip]
> >
> > Now your chaining patches.
> >
> > Apparently you take the total opposite direction now, where you first
> > have a Portage in EPREFIX (how you got it is questionable), and within
> > this Portage you expect it to take stuff it works with (bash, sed) from
> > a different location, let's call it CPREFIX.

another thing i'd like to propose. prefix-chaining does not change the
behaviour of anything as long as no READONLY_EPREFIX is set in
make.conf. i'm taking much care not to break things by accidently taking
executables for example from / or from somewhere they might be broken.
this is true for all of portage/baselayout/etc. (i think i manage to do
it right ;)), but aparently not for the ebuilds.

in some places i simply put a type -P instead of EPREFIX/... as you
said, this is wrong. so i'd like to do something like the portage
function i added yesterday: a function that does this (pseudocode):

find_in_eprefix_or_ro_root(path) {
	if -x $EPREFIX/$path
		return $EPREFIX/$path

	for root in readonly_roots {
		if allows_DEPEND($root) && -x $root/$path
			return $root/$path
	}

	return $EPREFIX/$path
}

i'd like to add this to prefix.eclass. this does not change the
behaviour of an evuild if there is no readonly root set, but makes it
work if there is...

ideas?

Cheers, Markus

[snip]
> Cheers, Markus
>
> >
> >
>
>