optical devices now in disk group instead of cdrom

optical devices now in disk group instead of cdrom

[William Hubbs]

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All,

someone on gentoo just reported to me that the following rule has been
deleted from udev-174, which is leaving his optical devices in the
standard "disk" group. He does not want to add his users to this group.

SUBSYSTEM=="block", KERNEL=="sr[0-9]*", SYMLINK+="scd%n", GROUP="cdrom"

Did you intend to move optical devices to the disk group?

Thanks,

William


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Re: optical devices now in disk group instead of cdrom

[Tom Gundersen]

On Mon, Nov 7, 2011 at 7:45 AM, William Hubbs <w.d.hubbs@gmail.com> wrote:
> someone on gentoo just reported to me that the following rule has been
> deleted from udev-174, which is leaving his optical devices in the
> standard "disk" group. He does not want to add his users to this group.
>
> SUBSYSTEM="block", KERNEL="sr[0-9]*", SYMLINK+="scd%n", GROUP="cdrom"
>
> Did you intend to move optical devices to the disk group?

I'm having similar questions from Arch users, so would also be
interested in an explanation. Especially, why /dev/srX is not assigned
the same group as the corresponding /dev/sgX.

On a (possibly) related note: The 'sg' module is no longer loaded
explicitly (as of 'rules: do not load sg module'). Why is this no
longer needed, and how is it supposed to work? I have heard of
problems with missing /dev/sgX devices, but have not yet figured out
exactly what the problem was (too many weird things going on).

Cheers,

Tom

Re: optical devices now in disk group instead of cdrom

[Kay Sievers]

On Sun, Nov 6, 2011 at 21:45, William Hubbs <w.d.hubbs@gmail.com> wrote:
> someone on gentoo just reported to me that the following rule has been
> deleted from udev-174, which is leaving his optical devices in the
> standard "disk" group. He does not want to add his users to this group.
>
> SUBSYSTEM="block", KERNEL="sr[0-9]*", SYMLINK+="scd%n", GROUP="cdrom"
>
> Did you intend to move optical devices to the disk group?

No, that wasn't intentional, only the symlinks were meant to be
removed. Added the permissions setting back now.

Thanks,
Kay

Re: optical devices now in disk group instead of cdrom

[Kay Sievers]

On Sun, Nov 6, 2011 at 23:25, Tom Gundersen <teg@jklm.no> wrote:
> On a (possibly) related note: The 'sg' module is no longer loaded
> explicitly (as of 'rules: do not load sg module'). Why is this no
> longer needed, and how is it supposed to work? I have heard of
> problems with missing /dev/sgX devices, but have not yet figured out
> exactly what the problem was (too many weird things going on).

The sg devices are replaced by the bsg devices or by the SG_IO
commands on the block device. The few people who rely on the legacy
ones should just force-load the module, udev does no longer
unconditionally load it.

Kay