[gentoo-portage-dev] new portageq metadata function to wrap dbapi.aux_get()

[Zac Medico]

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Hi everyone,

It's come to my attention that the built_with_use function in eutils.eclass accesses the installed package database directly.  This is a major problem because it prevents us from being able to have an alternative installed package database implementation without breaking that function.  How about if we add a new portageq function that simply acts as a wrapper to the dbapi.aux_get() function?  If we provide this function, then eutils.eclass can simply use the package that is returned from best_version to do another call that gets the USE flags.  Here's an example of the usage:

portageq metadata / installed sys-apps/portage-2.1-r1 USE

That command would print 1 line with all the USE flags.  If additional metadata keys are specified, it will print each value on a new line.  Does the behavior described above seem good or are there any suggestions to improve it?  Please see the attached patch.

Zac
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