Re: [gentoo-dev] RFC: auto-detection of unpack dependencies

[Doug Goldstein]

Marius Mauch wrote:
> As a result of Cardoes earlier mail we talked a bit about possible
> solutions in #gento-portage, and I suggested to let portage
> automatically inject the deps based on SRC_URI pattern matching.
> A mapping of extensions and their unpack deps would be kept in the tree
> (e.g. mapping '.tar.bz2' to '( app-arch/tar app-arch/bzip2 )'
>
> Benefits:
> - simplified depstrings for most packages (I assume >90% of the tree)
> - easier maintenance if dependencies are changing, or additional
> implementations become supported (this could also be achieved with
> virtuals though)
> - potentially more accurate dependencies, as some common errors would
> be eliminated (e.g. proper treatment of use-conditionals, not adding
> unpack deps to RDEPEND)
> - long-term adds the possibility to remove bzip2, gzip and tar from
> @system
>
> Potential problems:
> - might cause trouble for some packages that use custom code for
> unpacking, or due to circular deps, this could simply be solved with a
> new RESTRICT value though.
> - automagic deps could be confusing to devs/users
> - not available for existing EAPIs (due to the mentioned problems)
> - slightly slower dep calculations due to the extra processing
> - possible match errors
>
> So, is this something ebuild maintainers would like in general, or does
> such a feature cause you nightmares?
>
> Marius
>
I'm in favor of this.
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