[vox-tech] devfs and mkisofs, don't have permission to create multisession cd's

Samuel N. Merritt vox-tech@lists.lugod.org
Sat, 31 Jan 2004 01:12:51 -0800


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On Fri, Jan 30, 2004 at 04:04:02PM -0800, Ken Bloom wrote:
> I have a backup script that I run periodically (and I haven't run it
> in two whole weeks), and I was trying to run it today but since having
> switched to devfs, the permissions on the cd drive's device file seem
> to have changed (probably as a result of the switch), so that I can't
> read the file system. As a result, I can't add new sessions to a CD
> because a permissions error keeps mkisofs from reading the previous
> sessions on the CD.
>=20
> Devfs complains about /dev/sg0
>=20
> [bloom@kabloom ~]% ls -l /dev/sg0
> lr-xr-xr-x    1 root     root           36 2004-01-30 07:22 /dev/sg0
> -> scsi/host0/bus0/target0/lun0/generic
> [bloom@kabloom ~]% ls -l `readlink -f /dev/sg0`
> crw-r--r--    1 root     cdrom     21,   0 1969-12-31 16:00
> /dev/scsi/host0/bus0/target0/lun0/generic
>=20
> Does anybody know what the correct permissions should be, or how to
> fix this problem?

I'd set the device to 664 and make sure that the user running the
backup script is in the "cdrom" group.=20


--=20
Samuel Merritt
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