Support USB booting

[tjhorner]

USB drives are mounted as /dev/usbdiskXX, so I changed the glob to match. I don't know if this still matches normal drives, and I don't really have the ability to test that.

[homeassistant]

Hi @tjhorner,

It seems you haven't yet signed a CLA. Please do so here.

Once you do that we will be able to review and accept this pull request.

Thanks!

[agners]

I don't know if this still matches normal drives, and I don't really have the ability to test that.

I triggered a development build with this change, I can try it on a Intel NUC booting from a S-ATA drive. I assume you tested USB boot then?

[agners]

Seems to boot fine on my Intel NUC booting from a S-ATA hard drive.

[tjhorner]

Yep, USB boot works. I tested it by running the commands manually in the boot shell. I'll try copying the boot partition from the dev build over to my NUC to see if it works too.

As I was falling asleep last night, I thought of something: why not just make the glob /dev/*.hassos-kernel0? That way anything with the label will get mounted, not just anything considered a "disk".

[agners]

why not just make the glob /dev/*.hassos-kernel0? That way anything with the label will get mounted, not just anything considered a "disk".

What else would be able to store hassos-kernel0 then a disk? 🤷‍♂️

Let's tackle that when there is an use case.

[tjhorner]

Well, sure, a physical disk is the only thing that could store it, but I'm mostly wondering what other identifiers (besides "usbdisk" and "disk") barebox can store at /dev. I looked through the docs but couldn't find anything useful. Basically, as a user, I expect anything that Barebox can detect should be able to boot into Home Assistant OS.