Re: trixie: cdrecord can no longer write to CD

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

D.R.Evans wrote:
> I just discovered that, following the upgrade from bookworm to trixie on my
> main desktop machine, when I try to write a hierarchy of data files to the
> CD drive, k3b says: "Cdrecord [sic] has no permission to open the device".
>
> Unhelpfully, k3b doesn't tell me what is the name of the device it is trying
> to open, nor what permission it (or cdrecord) lacks :-(

The mentioned "cdrecord" is probably wodim from package cdrkit.

The device is possibly /dev/sr0 if it is the only optical drive that
is attached to the computer.
But suspiciously

  sudo wodim --devices

talks of /dev/sg1, which on my Debian 12 is the generic SCSI device
associated to /dev/sr0. The number after "sg" may be different on your
system. Ask wodim.

The needed permissions are rw. Normally these permissions are given
to owner "root", group "cdrom", and by ACL to the desktop user.
Inquire by

  sudo getfacl /dev/sr0

which on my Debian 12 with fvwm user "thomas" says:

  # file: dev/sr0
  # owner: root
  # group: cdrom
  user::rw-
  user:thomas:rw-
  group::rw-
  mask::rw-
  other::---

and 

  sgdev=/dev/sg1
  sudo getfacl "$sgdev"

which on my Debian 12 shows the same permissions as /dev/sr0.


> Any suggestions as to what I might need to change?

If the rw-permission for your user is missing, try

  username=...your.user.name...
  sudo setfacl -m user:"$username":rw /dev/sr0
  sudo setfacl -m user:"$username":rw "$sgdev"

It might be that some of the automats set the device permissions when
the system starts up. It will be an adventure on its own to find the
place where this is controlled.


Have a nice day :)

Thomas