cdrecord suddenly doesn't allow burning

[maillist@bestworldweb.homelinux.com]

Try cdrecord as root. This should tell you if it is a permission
problem.

On Wed, 2003-08-06 at 19:32, Joris Huizer wrote:

> Hello everybody,
>
> I've got this problem, the cdrecord allways worked for
> me but now suddenly there are permission problems
>
> jorishuizer@debian:~$ cdrecord -v -eject -force
> blank=all speed=1 dev=0,0,0 cd_image
> /usr/bin/cdrecord: /usr/bin/cdrecord: Permission
> denied
> jorishuizer@debian:~$ cdrecord -scanbus
> /usr/bin/cdrecord:
> /usr/bin/cdrecord: Permission denied
>
> I think this started after I installed SANE but I
> don't have any idea why that could be related;
>
> It seems I'm in the right group for this:
>
> jorishuizer@debian:~$ ls -lh /usr/bin/cdrecord
> -rws--x--- 1 root cdrom 142 Jul 10
> 14:16 /usr/bin/cdrecord
> jorishuizer@debian:~$ groups
> jorishuizer cdrom audio src video
>
> Can anybody tell me what to do to make cd writing
> possible again (for normal users) ?
>
> Thanks very much,
>
> Joris
>
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[Andreas Janssen]

Hello

Joris Huizer (<joris_huizer@yahoo.com>) wrote:

> I've got this problem, the cdrecord allways worked for
> me but now suddenly there are permission problems
>
> jorishuizer@debian:~$ cdrecord -v -eject -force
> blank=all speed=1 dev=0,0,0 cd_image
> /usr/bin/cdrecord: /usr/bin/cdrecord: Permission
> denied
> jorishuizer@debian:~$ cdrecord -scanbus
> /usr/bin/cdrecord:
> /usr/bin/cdrecord: Permission denied
>
> I think this started after I installed SANE but I
> don't have any idea why that could be related;
>
> It seems I'm in the right group for this:
>
> jorishuizer@debian:~$ ls -lh /usr/bin/cdrecord
> -rws--x--- 1 root cdrom 142 Jul 10
> 14:16 /usr/bin/cdrecord
> jorishuizer@debian:~$ groups
> jorishuizer cdrom audio src video
>
> Can anybody tell me what to do to make cd writing
> possible again (for normal users) ?

Did you check the permissions for the device files /dev/scd* and
/dev/sg*? They should be owned by root.cdrom and be read-writable by
owner and group.

best regards
Andreas Janssen

--
Andreas Janssen
[email]andreas.janssen@bigfoot.com[/email]
PGP-Key-ID: 0xDC801674
Registered Linux User #267976


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[Danilo Raineri]

Joris Huizer wrote:

> /usr/bin/cdrecord: Permission denied

It seems that /usr/bin/cdrecord has been replaced by a script, which calls
the appropriate executable depending on the kernel version:

AinSoph:~# cat /usr/bin/cdrecord
#!/bin/sh
VERS=`/sbin/kernelversion`
case $VERS in
2.0|2.2)
exec cdrecord.shm "$@"
;;
2.4|*)
exec cdrecord.mmap "$@"
;;
esac

You can fiddle with the permissions of cdrecord.*

On my system, everything works if I chmod +r /usr/bin/cdrecord

--
Danilo Raineri, [email]danirain@tin.it[/email]


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[Sridhar M.A.]

On Wed, Aug 06, 2003 at 11:43:14AM +0000, Danilo Raineri wrote:

> Joris Huizer wrote:
>

> > /usr/bin/cdrecord: Permission denied

>
> It seems that /usr/bin/cdrecord has been replaced by a script, which calls
> the appropriate executable depending on the kernel version:
>
> AinSoph:~# cat /usr/bin/cdrecord
> #!/bin/sh
> VERS=`/sbin/kernelversion`
> case $VERS in
> 2.0|2.2)
> exec cdrecord.shm "$@"
> ;;
> 2.4|*)
> exec cdrecord.mmap "$@"
> ;;
> esac
>
> You can fiddle with the permissions of cdrecord.*
>
> On my system, everything works if I chmod +r /usr/bin/cdrecord
>

Do it the debian way. Add yourself to the cdrom group. /dev/scd0 has
root.cdrom as owner. That will solve the OP's problem.

Regards,

--
Sridhar M.A.

One Bell System - it sometimes works.


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[Joris Huizer]

--- Danilo Raineri <raidan77@tin.it> wrote:

> Joris Huizer wrote:
>

> > /usr/bin/cdrecord: Permission denied

>
> It seems that /usr/bin/cdrecord has been replaced by
> a script, which calls
> the appropriate executable depending on the kernel
> version:
>
> AinSoph:~# cat /usr/bin/cdrecord
> #!/bin/sh
> VERS=`/sbin/kernelversion`
> case $VERS in
> 2.0|2.2)
> exec cdrecord.shm "$@"
> ;;
> 2.4|*)
> exec cdrecord.mmap "$@"
> ;;
> esac
>
> You can fiddle with the permissions of cdrecord.*
>
> On my system, everything works if I chmod +r
> /usr/bin/cdrecord
>
> --
> Danilo Raineri, [email]danirain@tin.it[/email]
>
>

Well that idea about cdrecord seems to be the case
indeed. However, I did
chown root:cdrom cdrecord.mmap
chown root:cdrom cdrecord.shm

And ls -l /usr/bin/cdrecord* now gives me:
-rws--x--- 1 root cdrom 142 Jul 10
14:16 /usr/bin/cdrecord
-rwxr-xr-x 1 root cdrom 307K Jul 10
14:16 /usr/bin/cdrecord.mmap
-rwxr-xr-x 1 root cdrom 307K Jul 10
14:16 /usr/bin/cdrecord.shm

but before a cdmod +r cdrecord still replied,
/usr/bin/cdrecord: /usr/bin/cdrecord: Permission
denied

The /dev/scd* "files" are all root.cdrom; the /dev/sg*
"files" are all root.root

I was allready in the cdrom group so I tried the
following. I did chmod +r /usr/bin/cdrecord - and now
running cdrecord results in:

jorishuizer@debian:~$ cdrecord -v -eject -force -immed
speed=1 dev=0,0,0 cd_image
Cdrecord 2.01a16 (i686-pc-linux-gnu) Copyright (C)
1995-2003 Jörg Schilling
TOC Type: 1 = CD-ROM
cdrecord.mmap: Operation not permitted. WARNING:
Cannot do mlockall(2).
cdrecord.mmap: WARNING: This causes a high risk for
buffer underruns.
cdrecord.mmap: Operation not permitted. WARNING:
Cannot set RR-scheduler
cdrecord.mmap: Permission denied. WARNING: Cannot set
priority using setpriority().
cdrecord.mmap: WARNING: This causes a high risk for
buffer underruns.
scsidev: '0,0,0'
scsibus: 0 target: 0 lun: 0
cdrecord.mmap: Permission denied. Cannot open
'/dev/sg0'. Cannot open SCSI driver.
cdrecord.mmap: For possible targets try 'cdrecord
-scanbus'. Make sure you are root.
cdrecord.mmap: For possible transport specifiers try
'cdrecord dev=help'.
cdrecord.mmap: Also make sure that you have loaded the
sg driver and the driver for
cdrecord.mmap: SCSI hardware, eg. ide-scsi if you run
IDE/ATAPI drives over
cdrecord.mmap: ide-scsi emulation. Read
/usr/share/doc/cdrecord/README.ATAPI.setup!

?? now what should I do ? Should I change /dev/sg0 to
the cdrom group too ? :-s

By the way, why did cdrecord change to a script
(without a warning it seems) ?

Thanks very much for your help,

Joris

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