Re: [gentoo-dev] Should ${T} be defined in pkg_prepare ?

["Tiziano Müller" <dev-zero@gentoo.org>]

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Am Samstag, den 31.03.2012, 14:44 +0200 schrieb Ulrich Mueller:
> >>>>> On Sat, 31 Mar 2012, Maciej Grela wrote:
> 
> > I've read the PMS and I haven't found information whether this variable
> > is supposed to be set during pkg_prepare or not.
> 
> There is no such stage. You mean pkg_pretend, I suppose?
> 
> > Therefore I ask, what is the proper behaviour here ? Is there
> > documentation on what special env variables are supposed to be
> > defined in each stage ?
> 
> It's specified here:
> <http://dev.gentoo.org/~ulm/pms/4/pms.html#x1-11900012.1>
> 
> | Variable   Legal in   Consistent?    Description
> | ---------------------------------------------------------------------
> | T          All        Partially⁴     The full path to a temporary
> |                                      directory for use by the ebuild. 
> |
> | ⁴Consistent and preserved across a single connected sequence of
> | install or uninstall phases, but not between install and uninstall.
> | When reinstalling a package, this variable must have different
> | values for the install and the replacement.
> 
> > Can this be considered as a bug in paludis ?
> 
> The spec seems to be clear that T is legal in all phases, including
> pkg_pretend.

Well, I'd say: there is no sane value you can assign to $T since you are
not allowed to write anything anyway:

"pkg_pretend must not write to the
filesystem." (http://dev.gentoo.org/~ulm/pms/4/pms.html#x1-9700010.1.2)

and since "pkg_pretend is run separately from the main phase function
sequence, and does not participate in any kind of environment saving" it
is not guaranteed to be set to the same $T later.

Cheers,
Tiziano

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