Re: [kde-linux] Hotplug (USB) Problem with KDE 3.5.5 - dbus/hal

[Kevin Krammer <kevin.krammer@xxxxxx>]

On Monday 11 June 2007, Hans Hacker wrote:
> Well, the problem is, that we have dozends or more different groups...
> I thought about writing a script which adds all the different groups
> to '/etc/dbus-1/system.d/hal.conf' ...
> but i would prefer a somewhat cleaner method !

Well, the cleanest method from the system's perspective is of course to add 
all users who are allowed to  mount to the plugdev group.

If all users are allowed to handle plugable devices, it might be possible to 
have the HAL interface available without any restrictions, probably by using 
wildcards such as * in the group name.

> Can i switch back to pmount ? pmount would work perfect, because
> it accepts the settings from '/etc/security/group.conf'

Hmm, no idea.
Might depend on how the packages were built.

> I couldn't figure out how exactly kde mounts the devices ... i renamed
> 'kio_media_mounthelper' and wrote me a perl-script (with this name) which
> should mount the device via 'pmount' but it appears that kde doesn't use
> 'kio_media_mounthelper' ...

Mounting is delegated to HAL, I think kio_media_mounthelper has been used 
prior to the introduction of HAL.

The workflow is basically like this:
1) HAL detects the new device
2) it sends a signal on the system bus to notify other processes about this
3) the KDED module mediamanager detects this signal and opens the action 
dialog
4) if the chosen action requires a mount operation, mediamanager does a D-Bus 
call to HAL, asking it to mount the device, passing mount options the user 
has configured for this kind of device
5) HAL can additionally have its own (central) configuration of mount options, 
though I don't know if they are used in either case or only when the user 
process does not pass its own.

I am also not sure if HAL uses a mount helper or if it does the mount call 
itself.

Cheers,
Kevin

-- 
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring

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