[gentoo-dev] Re: [gentoo-commits] gentoo-x86 commit in mail-filter/dspam: ChangeLog dspam-3.8.0-r7.ebuild

[Donnie Berkholz]

On 10:11 Mon 01 Oct     , Alin Năstac wrote:
> In this case, $(use mysql || use postgres && use_enable virtual-users)
> will result in use_enable virtual-users being executed if and only if
> USE="-mysql postgres". See this pseudocode:

No .... if use mysql succeeds, || use postgres is skipped entirely and 
we go straight to the && use_enable. It's considered directly in order 
with no precedence.

To stretch it out:

	if use mysql; then               # skip || use postgres
		enable virtual-users
	if ! use mysql; then             # run OR: use postgres
		if use postgres; then
			enable virtual-users
		fi
	fi

>     if use mysql do nothing
>     else if use postgres
>           use_enable virtual
>
> Wouldn't be best to die in pkg_setup if USE="virtual-users -mysql
> -postgres" ?

It's better to do something smart than to force interactivity. In this 
case, you as the maintainer would decide whether this USE combo meant 
the user wanted virtual-users (if so, forcibly enable one of mysql or 
postgres), or whether the user definitely did not want to pull in a 
database (if so, force off virtual-users).

Thanks,
Donnie
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