HAL depreciated, but what replaced it?

Stanislav Ochotnicky sochotnicky at redhat.com
Thu Oct 13 16:17:44 UTC 2011

Excerpts from Richard Shaw's message of Thu Oct 13 16:13:00 +0200 2011:
> On Wed, Oct 12, 2011 at 8:16 PM, Dan Williams <dcbw at redhat.com> wrote:
> > udev replaced HAL, along with some additional helpers.  udev has a
> > database too, much like HAL.  You can use libudev or libgudev (if you
> > use glib) to talk to udev and get information.
> Ok, I found python-gudev which lets me talk to udev!
> And I thought the documentation on UDisks was poor. The only
> documentation in the package is a README file with a bad link and a
> test program.

You can use [1] (or look in your kernel source directory) for gudev
API documentation. The python wrapper basically does 1:1 copy of the

> >> I've worked around that for testing the property
> >> "DriveMediaCompatibility" > 0 since it returns an array but this would
> >> also pick up flash card readers, zip, and jaz drives. I'll have to
> >> modify that to look for "optical" on the front of any members of the
> >> array.
> >>
> >> Second, I can not find any property that reports the disc capacity.
> >> The only property that looked close is "DriveSize" but for a blank
> >> disc this reports the same as the SectorSize, 2048.
> >
> I'm thinking the equivalent in the python wrapper is "PartitionSize".
> The problem is that it AND "DeviceSize" both report 2048...

There is still a possibility there is a bug (or a missing feature) in
udisks. Maybe have a look at udisks/udev bug tracker?

> Right now I'm using the test program provided with python-gudev and I
> think I'm making headway. It has a property "ID_TYPE" that is "cd" for
> optical drives so that's one problem down. Now I just have to figure
> out how to:
> 1. Get the drive capacity.
> 2. Get the media state.
> 3. Detect and properly handle media changes.

Good luck finding what you are looking for,

[1] ftp://slackware.oregonstate.edu/pub/linux/utils/kernel/hotplug/gudev/index.html

Stanislav Ochotnicky <sochotnicky at redhat.com>
Software Engineer - Base Operating Systems Brno

PGP: 7B087241
Red Hat Inc.                               http://cz.redhat.com
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