[paranoia] SOLVED: Problems with cdparanoia

[Bill Davidsen]

The "problem" is that you need write permissions on the sg device to write
commands to it. One approach would be to make the group of the CD sg
device something like "ripper" and add group write. Then set that group on
paranoia and set the setgid bit.

That uses all standard UNIX features, you could also put just trusted
users in the ripper group (also standard and more secure) or try ACLs
(POSIX but somewhat less common code and needs tools). 


-- 
bill davidsen <davidsen at tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.





Hi !

Are you doing this as root? If nhot, you can access the /dev/cdrom device
for read as any user (typical permissions) but can't write to /dev/sg0 as
a normal user, so you can't write the read command to the device. Remember
that at low level when you send data to the device it is a write to the
generic device.

You are right, that's exactly the problem !!! (thanks to Kevin too for its
answer !!! ;-) )
I have tested this week end and I can use libparanoia as root but only as
root !

So I have 2 questions :
1) Why paranoia need to be root to EXTRACT (I mean not to write)
informations. Why it is not like playing an audio cd ???
I can understand for cdrecord but I definitely don't understand for a ripp
of cd ! ;-)

2) Is there any solution to fix this horrible problem ? I have written my
own encoding application (for GNUStep), and I want that the user use itself
the application (because of the user context and easy use).

I have tested many configurations of file rights and nothing works ... HELP
! ;-)

Thanks for help 

Stéphane PERON





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