[gentoo-portage-dev] forcing a USE flag if another is on

[gentoo-portage-dev] forcing a USE flag if another is on

[Amit Dor-Shifer]

Is there some method of specifing "if USE flag X is enabled, enable USE 
flag y as-well"? Something like a "conditional" use.force file in profiles/.
Amit

[gentoo-portage-dev] Re: forcing a USE flag if another is on

[Duncan]

Amit Dor-Shifer posted on Wed, 30 Dec 2009 16:45:40 +0200 as excerpted:

> Is there some method of specifing "if USE flag X is enabled, enable USE
> flag y as-well"? Something like a "conditional" use.force file in
> profiles/. Amit

That should be doable globally using /etc/portage/bashrc or the like (
/etc/portage/profile/bashrc).  For specific packages, it's doable using 
/etc/portage/env/cat-egory/<pkgname> files, altho that's not so well 
documented.

In any of those cases, syntax is standard bash, so you get the full range 
of bash conditionals and scripting available to setup your environment as 
complicated as you wish.  (However, it is my understanding that the 
/etc/portage/env files only get sourced for the bash/ebuild.sh side of 
portage, not for the python side, so stuff like depchecks and features 
that are dealt with on the python side, won't necessarily work as 
expected.  Test it if in doubt... or put it in one of the bashrcs, with a 
conditional so it's only applied to the package in question.)

-- 
Duncan - List replies preferred.   No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master."  Richard Stallman

Re: [gentoo-portage-dev] Re: forcing a USE flag if another is on

[Brian Harring]

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On Wed, Dec 30, 2009 at 04:20:45PM +0000, Duncan wrote:
> Amit Dor-Shifer posted on Wed, 30 Dec 2009 16:45:40 +0200 as excerpted:
> 
> > Is there some method of specifing "if USE flag X is enabled, enable USE
> > flag y as-well"? Something like a "conditional" use.force file in
> > profiles/. Amit
> 
> That should be doable globally using /etc/portage/bashrc or the like (
> /etc/portage/profile/bashrc).

It's not doable via bashrc (bashrc runs at build time)- intentionally 
to block abuses of this sort I might add.

Reiterating- playing w/ USE in bash doesn't change the USE state 
python/package manager side, meaning you'll not get the proper 
depedencies pulled in...

~harring

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Re: [gentoo-portage-dev] forcing a USE flag if another is on

[Zac Medico]

On 12/30/2009 06:45 AM, Amit Dor-Shifer wrote:
> Is there some method of specifing "if USE flag X is enabled, enable USE
> flag y as-well"? Something like a "conditional" use.force file in
> profiles/.
> Amit

We plan to extend the IUSE syntax to support that in a future EAPI.
See this bug:

  http://bugs.gentoo.org/show_bug.cgi?id=238887

-- 
Thanks,
Zac