Date: Sun, 6 May 2007 00:20:28 +0200
From: Colin Leroy <colin@colino.net>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Richard Purdie <rpurdie@openedhand.com>, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] led-class.c permission change
Message-ID: <20070506002028.53230d56@localhost.localdomain>
In-Reply-To: <20070505224803.67f76749@the-village.bc.nu>
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	<20070505224803.67f76749@the-village.bc.nu>
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On 05 May 2007 at 22h05, Alan Cox wrote:

Hi,=20

> > This patch changes the led brightness file's permissions to 0666,
> > so that a user's MUA can light up the mail LED without needing root
> > permissions. =20
>=20
> NAK.
>=20
> The management of user specific temporary permissions belongs in user
> space with a safe "no" default value to stop background daemons doing
> silly things.

Mmh, ok... My usage pattern for this is for an MUA plugin[1] that does
write 1 to /sys/class/leds/asus:mail/brightness, for example, when new
mail comes. The MUA typically runs as user and until now most of the
handled LEDs had no such permission problems
(/proc/acpi/asus/mled, /proc/acpi/acer/mailled etc).=20

So, I've got to find a way to write into that file as user so that
things automatically work.

> Take a look at the various pam console management modules (and also
> beat people up to get revoke() support into the kernel).

So, you suggest me to link my plugin to libpam and find something that
allows the plugin to write into /brightness?=20

Thanks,

[1] http://www.claws-mail.org/plugin.php?plugin=3Dacpinotifier
--=20
Colin

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