CDrecord rund for root, not other user(s)

ewto · 01-11-2004, 11:41 PM

I've been reading all the other posts about CD record problems, but can't find one that quite solves my problem.

When I run cdrecord as root, I have no problem, it burns away happily.

When I try to run it as any other user, I get:

Code:

drecord 2.0 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling
TOC Type: 1 = CD-ROM
cdrecord: Operation not permitted. WARNING: Cannot do mlockall(2).
cdrecord: WARNING: This causes a high risk for buffer underruns.
cdrecord: Operation not permitted. WARNING: Cannot set RR-scheduler
cdrecord: Permission denied. WARNING: Cannot set priority using setpriority().
cdrecord: WARNING: This causes a high risk for buffer underruns.
scsidev: '1,0,0'
scsibus: 1 target: 0 lun: 0
cdrecord: Permission denied. Cannot open '/dev/sg0'. Cannot open SCSI driver.
cdrecord: For possible targets try 'cdrecord -scanbus'. Make sure you are root.
cdrecord: For possible transport specifiers try 'cdrecord dev=help'.
Cdrecord 2.0 (i686-pc-linux-gnu) Copyright (C) 1995-2002 J?rg Schilling

This was working fine up until a few days ago, and I haven't made a single change to the machine that I know of; although I did have to do my first reboot in 90 days in order to try to resolve an issue with a usb card reader I have... after the reboot, this error started happening.

I did run cdrecord-scanbus and 1,0,0 is the correct address, although I guess that's obvious since it works when I run it as root.

It's obviously a permissions problem to me ... but WHERE?

Thanks!

the cdrom burner's line in my /etc/fstab looks like this:

Code:

/dev/cdrom   /mnt/cdrom   udf,iso9660,noauto,users,kudzu,ro 0 0

ewto · 01-12-2004, 01:58 AM

Ok, I have it working for now by using sudo.

In my sudoers file I added the line:

Code:

%username ALL=(ALL)  NOPASSWD: ALL

I relatively certain that this presents a security problem ... but for now it has my program running. What is the correct format for me to assign the sudo to only the cdrecord program? I tried several ways and visudo kept telling me there was a syntax error.

Thanks

hw-tph · 01-12-2004, 05:35 AM

Quick and dirty solution: chmod a+rw /dev/sg0, then chmod a+rw /dev/scd0.
For more elegant solutions using group access, search these forums.

Håkan

ewto · 01-12-2004, 06:20 AM

Thanks!

That sounds much safer than the sudo solution.

Thanks again for your time!