Re: [gentoo-dev] CDRW permissions and devfsd

[Stuart Bouyer]

On 水, 2002-08-28 at 07:39, Yrjö Hatakka wrote:
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> On Tuesday 27 August 2002 13:23, Stuart Bouyer wrote:
>
> > add this line to devfsd.conf
> >
> > REGISTER        ^sr0$       PERMISSIONS root.cdrw 660
> >
>
> Nope no avail besides cdrecord wants sg0
>
> yrjo_h@cartman yrjo_h $ cdrecord dev=/dev/sr0 -scanbus
> Cdrecord 1.11a30 (i686-pc-linux-gnu) Copyright (C) 1995-2002 Jörg Schilling
> scsidev: '/dev/sr0'
> devname: '/dev/sr0'
> scsibus: -2 target: -2 lun: -2
> cdrecord: Read-only file system. Cannot open '/dev/sr0'. Cannot open SCSI
> driver.
> cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are
> root.
>
>
> > I think you'll find that the cdrw is a scsi scdrom rather than a scsi
> > generic device.
> >
> > stu@gentoo-bear etc $ ls -l /dev/cdrw
> > lr-xr-xr-x    1 root     root            3 2002-08-28  /dev/cdrw -> sr0
> >
>
> yrjo_h@cartman yrjo_h $ l /dev/cdrw
> lr-xr-xr-x    1 root     root            3 Aug 27 22:31 /dev/cdrw -> sg0
> yrjo_h@cartman yrjo_h $ l /dev/sg0
> lr-xr-xr-x    1 root     root           36 Aug 27 22:31 /dev/sg0 ->
> scsi/host0/bus0/target0/lun0/generic
> yrjo_h@cartman yrjo_h $ l /dev/scsi/host0/bus0/target0/lun0/generic
> crw-r-----    1 root     root      21,   0 Jan  1  1970
> /dev/scsi/host0/bus0/target0/lun0/generic
>
> cartman root # kill -HUP `pidof devfsd`
> cartman root # l /dev/sg0
> lr-xr-xr-x    1 root     root           36 Aug 27 22:31 /dev/sg0 ->
> scsi/host0/bus0/target0/lun0/generic
> cartman root # l /dev/scsi/host0/bus0/target0/lun0/generic
> crw-rw----    1 root     cdrw      21,   0 Jan  1  1970
> /dev/scsi/host0/bus0/target0/lun0/generic
> cartman root #
>
> What to next ?, I'm out of ides
>

Do you have scsi-cdrom support in the kernel or as a module? Otherwise
as normal user I can't use cdrecord as it looks for sg0.

from my kernel .config
#
# SCSI support
#
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=y
CONFIG_SD_EXTRA_DEVS=40
# CONFIG_CHR_DEV_ST is not set
# CONFIG_CHR_DEV_OSST is not set
CONFIG_BLK_DEV_SR=y
CONFIG_BLK_DEV_SR_VENDOR=y
CONFIG_SR_EXTRA_DEVS=2
CONFIG_CHR_DEV_SG=y
CONFIG_SCSI_DEBUG_QUEUES=y
CONFIG_SCSI_MULTI_LUN=y
CONFIG_SCSI_CONSTANTS=y
# CONFIG_SCSI_LOGGING is not set

Another thing to try is check in /lib/dev-state, where devfsd keeps all
its permissions and make sure that it isn't being set there. Not sure
why it changes after a SIGHUP, but not a boot time though

Stuart Bouyer