Re: [gentoo-dev] The fallacies of GLEP55

[Tobias Klausmann]

Hi! 

On Fri, 15 May 2009, Ciaran McCreesh wrote:
> > eval `grep '^EAPI=' ebuildfile | head -n 1`
> >
> > will set EAPI in the current scope to EAPI in the ebuild, without
> > sourcing it, unless the issue with something like this would be its
> > use of grep and head, but these are both in the system set, so unless
> > you don't want to depend on the system set, I don't know what the
> > objection would be.
>
> The objection is that your code doesn't work. It's entirely legal to
> do, say:
>
>     export EAPI="1"

Change the spec, then. Or aren't we talking about
writing/changing/clarifying a spec right now? I mean... yes,
ebuilds are actually bash scripts. But I don't see a problem with
using a subset of what's allowed for *this* *specific* line. 

Actually, I personally would prefer taking it out of the
parsed-by-bash part entirely. Add it as a shebang-like line at
the top:

#EAPI-1

as the first or second line. Allowing it on the second line
allows you to later bolt on a true shebang-line if you should so
desire. Only having to look at the first two lines makes finding
it out easier (note that I don't call that parsing on purpose).

> or:
>
>     inherit versionator
>
>     if version_is_at_least 2 ; then
>         EAPI="2"
>     else
>         EAPI="0"
>     fi

I was under the impression that it's illegal to change/set the
EAPI after using inherit.

Regards,
Tobias

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