Re: [gentoo-dev] Dependencies that're available at pkg_*inst

[Ciaran McCreesh <ciaran.mccreesh@googlemail.com>]

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On Sat, 19 Apr 2008 18:38:06 +0200
"Marijn Schouten (hkBst)" <hkBst@gentoo.org> wrote:
> Every package dependency in DEPEND is installed and usable before
> src_unpack starts, right? So is the question here whether or not they
> can be uninstalled right before pkg_{pre,post}inst starts?

If we're using binaries, DEPEND is usually ignored.

> I don't know what the general use of pkg_preinst is, but in
> pkg_postinst the package itself should be runnable, so its RDEPENDS
> should be installed and usable at this point. So perhaps we should
> define that "usable" means "each of its RDEPENDs is installed and has
> had its pkg_postinst function run". The recursion of that definition
> then comes from the requirement that RDEPENDs should be usable before
> pkg_postinst starts running.

No good. That prevents RDEPEND <-> RDEPEND cycles from being solved,
and the package manager has to be able to solve that.

> If only one of those packages has a pkg_postinst then it is still
> solvable. If they both have a pkg_postinst then one of those is
> probably not essential for the actual usability of the package and
> should be removed. A final possibility is that the pkg_postinsts are
> both necessary for a fully functional package but not for the
> functionality used in the other pkg_postinst. If this is the case,
> then perhaps we should specify deps according to which ebuild phase
> they are necessary for?

Not with current EAPIs we can't.

> SRC_UNPACK_DEP="app-arch/unzip"
> SRC_COMPILE_DEP="dev-scheme/bigloo"
> SRC_INSTALL_DEP=""

Labels are a cleaner solution to this. But again, we're discussing
current EAPIs here.

-- 
Ciaran McCreesh

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