andrewlow
commented
10 months ago I have a solution! The reason I am posting here is so that anyone looking for a solution can find it easier once this is closed.
NixOS when installed on a 'bare metal' machine doesn't expose the 'sg' devices at all. At first I thought this was a docker specific issue, but it turns out that the problem is NixOS itself - docker is innocent.
This forum post: https://discourse.nixos.org/t/makemkv-cant-find-my-usb-blu-ray-drive/23714 captures the problem and the solution. I will repeat here.
In the naive install / broken state - the lsscsi -g command shows the problem
$ lsscsi -g
[0:0:0:0] cd/dvd ASUS DRW-1814BL 1.10 /dev/sr0 -
[3:0:0:0] cd/dvd HL-DT-ST BDDVDRW CH12LS28 1.00 /dev/sr1 -
[.. other drives cut...] Yeah - so the - is the issue here. We expect that there should be /dev/sgY devices listed.
We can manually fix this with this command on the NixOS host
$ sudo modprobe sgThis will cause /dev/sg0 and /dev/sg1 to appear (or did on my system)
Then the docker container will work.
If you want your NixOS install to be fixed properly - you need to add the following to your /etc/nixos/configuration.nix file
# Add missing kernel mods to create /dev/sgY devices
boot.kernelModules = [ "sg" ];Now your installation will always have the /dev/sgY devices that MakeMKV requires.
Current Behavior
A naive user on NixOS may not realize that while docker works fine, this container will fail because MakeMKV has some unique requirements about detecting the optical drives.
Expected Behavior
It would be nice if /dev/sgY wasn't required - but it is.
Steps To Reproduce
Following installation instructions for this container with docker on NixOS results in it not being able to find any optical drives.
Environment
Container creation
docker run -d \ --name=makemkv \ -p 5800:5800 \ -v /home/roo/data/makemkv:/config:rw \ -v /home/user/Videos:/output:rw \ --device=/dev/sr0 \ --device=/dev/sr1 \ --restart=unless-stopped \ jlesage/makemkv
Container log
Container inspect
No response
Anything else?
No response