sata/ata device permission for user

[Polytropon]

On Thu, 18 Apr 2013 00:32:09 -0700 (PDT), Beeblebrox wrote:
> >> The user also needs access to the corresponding pass device which is shown
> by "camcontrol devlist". He also needs access to /dev/xpt0 I think. 

Correct, that matches my settings. :-)



> <HL-DT-ST DVDRAM GSA-4165B DL05>   at scbus6 target 0 lun 0 (cd0,pass3)
> 
> crw-------  1 root  operator  0x48 Apr 18 07:08 pass0
> crw-------  1 root  operator  0x49 Apr 18 07:08 pass1
> crw-------  1 root  operator  0x4a Apr 18 07:08 pass2
> crw-------  1 root  operator  0x4b Apr 18 07:08 pass3
> crw-------  1 root  operator  0x42 Apr 18 07:08 xpt0
> 
> User is member of operator group.

But the group permissions are --- (none).



> However, I agree with your idea because
> just now I was working with cdrtools and got this error, but when I ran as
> root no error:
> 
> % cdda2wav summary --device /dev/cd0
> cdda2wav: Permission denied. Open of /dev/xpt0 failed. Cannot open or use
> SCSI driver.
> cdda2wav: For possible targets try 'cdda2wav -scanbus'. Make sure you are
> root.
> Probably you did not define your SCSI device.
> Set the CDDA_DEVICE environment variable or use the -D option.

You should be able to see something like this:

% cdda2wav summary --device /dev/cd0
No target specified, trying to find one...
cdda2wav: Too many CD/DVD/BD-Recorder targets found.
scsibus0:
        0,0,0     0) 'HL-DT-ST' 'DVDRAM GSA-H42N ' 'RL00' Removable CD-ROM
        0,1,0     1) 'HL-DT-ST' 'DVD-ROM GDR8163B' '0L30' Removable CD-ROM
        0,2,0     2) *
        0,3,0     3) *
        0,4,0     4) *
        0,5,0     5) *
        0,6,0     6) *
        0,7,0     7) *
cdda2wav: Select a target from the list above and use 'cdda2wav dev=b,t,l'.


As it has been mentioned, access to xpt is also required.
It should be fine to set this via group permissions.

This is an example of possible settings:

	link    cd0     dvd
	own     cd0     root:operator
	perm    cd0     0660
	own     cd1     root:operator
	perm    cd1     0660
	own     pass0   root:operator
	perm    pass0   0660
	own     pass1   root:operator
	perm    pass1   0660
	own     xpt0    root:operator
	perm    xpt0    0660

See "man xpt" for details.


-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...