Bug#991639: udev: 80-debian-compat.rules can yield non-stable and inconsistent symlinks

[Michael Biebl]

Am 29.07.21 um 15:07 schrieb Vincent Lefevre:
> Package: udev
> Version: 247.3-6
> Severity: normal
> 
> My machine has 2 DVD-RW drives, and /lib/udev/rules.d/80-debian-compat.rules
> sometimes yields the following symlinks:
> 
> lrwxrwxrwx 1 root root 3 2021-07-29 14:25:55 /dev/cdrw -> sr1
> lrwxrwxrwx 1 root root 3 2021-07-29 14:25:55 /dev/dvd -> sr0
> lrwxrwxrwx 1 root root 3 2021-07-29 14:25:55 /dev/dvdrw -> sr0
> 
> instead of /dev/cdrw -> sr0 for the first one, to be consistent with
> the other symlinks.
> 
> I already reported the issue in 2017 (4 years ago!), but nothing has
> been done yet. See
> 
> * Initial message:
>    https://lists.debian.org/debian-user/2017/04/msg00789.html


And the comment from 2017 still holds true:
https://lists.debian.org/debian-user/2017/04/msg00790.html

"
See the comment in there:

# These rules will create symlinks for CD/DVD drives, to help old
# programs which are unable to automatically discover the devices.
# The first detected device gets the symlink, but this is not stable across
# reboots.

So, yes, what you see can happen depending on the order devices are
discovered.
"


The kernel hasn't changed. It still probes devices asynchronously.
There is not much we can do about that.

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