Public SourceMage Discussion List

[Eric Sandall <eric AT sandall.us>]

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On Sun, 11 Sep 2005, Flavien Bridault wrote:
> Hello !
>
> Well, trying to get gnome-volume-manager 1.5.1 working, I think I
> highlighted several interesting problems concerning udev, hotplug, dbus
> and hal. I got the stuff working, but some changes need to be done, and
> as I'm not an expert, I would like to hear some others opinions.
>
> 1) First of all, hal needs to have to more options enabled :
> --enable-sysfs-carrier --enable-hotplug-map
>
> Should we put this optional, or default ?

Does it break anything adding them? If they make hal work as people
would expect (e.g. for gnome-volume-manager) and they don't break any
other packages that use hal, then I say add them by default.

> 2) Hal is launched with haldaemon user, but with current default udev
> rules on block devices, it will have no access to them (that worked with
> 0.4 but no longer with 0.5), and causing automounting impossible. The
> devices does even not appear with lshal. So the first idea would be to
> add haldaemon in root group, but I guess it is not very secure. So we
> may, as a lot of distros, add disk, cdrom, cdrw, floppy, or scsi groups
> for each category of devices and then add haldaemon in this group. Your
> thoughts ?

We already have groups for disk, cdrom, and floppy, plus the cdrtools
package optionally adds a cdrecord group (IIRC). I'd be fine with
adding haldaemon to those groups if it makes it functional.

> Those two points are sufficient to make gvm working using /etc/fstab.
> Pmount can be used then (optionally I think), but a sorcery bug
> currently prevents it to be used by gvm [0]. pmount uses /media to mount
> devices that do not appear in /etc/fstab. That will re-launch the
> debates about using /media or not. Well in fact, I'm not sure /media is
> not yet in the default SMGL root layout, can someone clarify this
> point ?

It's currently setup by the ISOs, but we're still on FHS 2.2 (IIRC)
which does not have /media nor /srv (since we as a distro voted not to
use them when FHS was asking).

> The two last points are not useful for gvm, but as I investigated
> through them, I would be interested in having more informations about
> them, or maybe if someone already tried these stuff.
>
> 3) I read things about making udevsend the hotplug multiplexer ( using :
> sysctl -w kernel.hotplug="/sbin/udevsend" ) instead of /sbin/hotplug for
> kernels >= 2.6.10. I don't really understand what is the real difference
> with that, and anyway I didn't see a lot of difference using it. I don't
> know a lot of things about hotplug, but I saw that a lot of distros use
> it. In the same way, these distros used to create a
> symlink /etc/hotplug.d/default/10-udev.hotplug which points
> to /sbin/udevsend, in order to call udevsend first when a hotplug event
> comes. I wonder is this is not redundant...

Until we know what it does, I say leave it as the default. Volunteers
are, of course, welcome to work on it. ;)

> 4) dbus-launch with gnome-session question. I thought it was needed to
> get gvm working, but in fact, digital camera detection no more works
> when I launch gnome-session with dbus-launch... Maybe there is something
> that I didn't well setup ?

Might depend on the camera? I believe some cameras need drivers (e.g.
from libgphoto2), but I haven't played with cameras much.

> I have the general feeling we are not really up-to-date with
> udev/hotplug setup, so that might be the time to do that. I will really
> appreciate any clarifications, because, as I already said it, I'm not
> very familiar with all these stuffs... ;-)

We just use the default setups, but it would be nice to have them
setup 'properly' if we're not already doing so.

> [0] http://bugs.sourcemage.org/show_bug.cgi?id=9754

Thanks for looking into this Flavien!

- -sandalle

- --
Eric Sandall                     |  Source Mage GNU/Linux Developer
eric AT sandall.us                  |  http://www.sourcemage.org/
http://eric.sandall.us/          |  SysAdmin @ Inst. Shock Physics @ WSU
http://counter.li.org/  #196285  |  http://www.shock.wsu.edu/
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