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

[Ken Bloom]

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I don't know what was actually wrong with the permissions after all (I was =
in the cdrom group, and mkisofs had a devfs file entry to make it work, but=
 it didn't regardless.)

I finally made it work by changing the command I used to invoke mkisofs fro=
m the option -M0,0,0 to the option -M /dev/cdrom (which is a symlink to /de=
v/cdroms/cdrom0) and that made it work

On 2004.01.31 07:52, Ken Herron wrote:
> --On Saturday, January 31, 2004 01:12:51 AM -0800 "Samuel N. Merritt"=20
> <spam@andcheese.org> wrote:
>=20
> > 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.
> >>
> >> Devfs complains about /dev/sg0
> >>
> >> [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
> >
> >
> > I'd set the device to 664 and make sure that the user running the
> > backup script is in the "cdrom" group.
>=20
> Some systems will change the ownership on various devices to match the=20
> user logged in on the console, then set the ownership back when the user=
=20
> logs out. The idea is to let the person sitting in front of the computer=
=20
> have access to the cd-roms, sound device, etc. See if you have a file=20
> named "console.perms" in /etc/security or some similar location. You=20
> should be able to adjust it to include the scsi generic devices.
>=20
> --=20
> Ken Herron
> _______________________________________________
> vox-tech mailing list
> vox-tech@lists.lugod.org
>=20

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