Re: [gentoo-dev] linux-info.eclass: check_extra_config requires a configured kernel

[Ian Stakenvicius <axs@gentoo.org>]

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On 04/11/11 11:11 AM, Fabio Erculiani wrote:
> On Fri, Nov 4, 2011 at 3:46 PM, Mike Gilbert <floppym@gentoo.org> wrote:
>>
>> It is good that we warn users about this when they install the package,
>> but I don't think the ebuild should die.
> 
> I've always found ebuilds dying at kernel config checks really annoying.
> Checking kernel features at build time (if we die) is broken and
> should be banned IMO:
> 
> 1) in case of packages not needing kernel headers for building (but
> just checking for a feature)
> a) this breaks the compilation inside chroots on build servers where
> the goal is to just build the package (hint: binpkgs)
> b) it is anyway unable to reliably check if the feature is actually
> available or not (/proc/config.gz might be unavailable, as well as
> kernel sources or headers)

As i think has already been mentioned, when building binpkgs or building
for other systems, since the idea here is to ensure build-time
requirements are met, things should be OK as long as you have a
configured kernel for the target in place as well.  And you probably
should; if you're building packages for target systems you might as well
configure and/or build their kernels too.

Also as was mentioned, /proc/config.gz would never be appropriate in
these cases since the running kernel probably has nothing to do with the
target system's kernel.

> 
> 2) in case of packages needing kernel headers (or sources) for building
> a) doing the check in pkg_setup() breaks binpkgs support (the check
> becomes part of a build time task, and not install time)

.. so you're recommending the check be moved to pkg_preinst() ?  Or
perhaps duplicated into both pkg_setup/pkg_pretend and pkg_preinst ?
That would be doable, wouldn't it?

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