Mount additional disks

[thirdeyenick]

Hi there. I wanted to ask if there is already a possibility to mount additional USB connected disks in gokrazy? I'd like to use minio with additional USB disks on my gokrazy powered raspberry pi. If this is not possible so far, I was thinking about an '/etc/fstab' similar approach, but instead of a file, the additional disks can be specified in the gokrazy config. Then the supervise init process could take care of mounting before starting all configured applications and unmounting after all the applications have finished.

[stapelberg]

This is not currently implemented.

You can deploy a small Go program to mount the external disk, though. Hopefully the minio process recovers automatically? Otherwise, you could disable starting minio automatically and start it from your program.

[flber]

Perfect, that seems to work! - would that be something to make a pr for?
Jellyfin had some trouble reading from the drive, but some futzing and it works now :)

[damdo]

@flber May be worth writing a little guide about this on the gokrazy website :)
It might be useful to others!

[flber]

@damdo yeah that could definitely be good, unfortunately it seems my setup is a little fragile right now - I managed to fully crash my install :P (I think it was jellyfin's fault).
But the exfat thing would probably be helpful to document even if it's not part of a larger example.

[stapelberg]

Yeah, feel free to send a PR to include exfat in gokrazy/kernel. If it increases the kernel size significantly we should enable it as a module.

[flber]

Okay, a PR has been made

[thirdeyenick]

For the time being, I added a rough implementation which allows to mount additional partitions, by specifying them in a /perm/mount-disks.json file:

{
  "disks": [
    {
      "partUUID": "<found via blkid>",
      "type": "ext4",
      "mountpoint": "/perm/mounts/disk1",
      "options": ""
    }
  ]
}

I then used a replace directive in my <instance>/builddir/github.com/gokrazy/gokrazy/go.mod file to point to it. So far it works quite well for my use case, but a more advanced implementation might be needed for this.

[stapelberg]

Thanks, I referenced this over in issue #236