Re: [gentoo-dev] Fw: [gentoo-commits] gentoo-x86 commit in app-backup/bacula: bacula-5.0.2-r2.ebuild ChangeLog

[Thomas Beierlein <tomjbe@gentoo.org>]

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Hi Jorge,

On Thu, 22 Jul 2010 18:04:59 +0000
"Jorge Manuel B. S. Vicetto" <jmbsvicetto@gentoo.org> wrote:
> If you want to use sqlite3 as default and assuming your prefer
> postgres over mysql, you can use the following and drop the die from
> pkg_setup.
> 
> DEPEND="
... snip ...
>     !bacula-clientonly? (
>         sqlite3? (
>             app-backup/bacula[-mysql.-postgres]
>             dev-db/sqlite:3
>         )
>         !sqlite3? (
>             postgres? (
>                 mysql? ( app-backup/bacula[-mysql] )
>                 dev-db/postgresql-base[threads]
>             )
>             !postgres? (
>                 mysql? ( virtual/mysql )
>                 !mysql? ( app-backup/bacula[sqlite3] )
>             )
>             !bacula-nodir? ( virtual/mta )
>     )
... snip ...
> "

interesting. I did not know that an ebuild can use-depend on itself.
Good to know.

I had implemented a simpler solution in meantime. But I will test your
solution. It would shorten the ebuild by a good amount (It is already
much to big and complicated).

Furthermore it catches the problems very early (before merging the
wrong dependencies).

Only downside I see is that the user has to find out why she gets the
messages about the wrong USE flag requirements. Say, you want to build
it with mysql and have 'sqlite' in make.conf your
	USE=mysql emerge bacula
resultes in a 
        emerge: there are no ebuilds built with USE flags to satisfy
 		"app-backup/bacula[-mysql,-postgres]".
And than you have to think.

Anyway I will think over it. 

Regards,
	Thomas.
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