Add ttyUSB dialup devices in the toolbox

[mildred]

Sometimes, in the toolbox, you need to access external hardware, either to communicate with an external device or flash a chip. Inside the toolbox, /dev/ttyUSB* is empty.
It would be nice if those devices were available. Possibly those devices can only appear after the toolbox has been entered. Perhaps sharing the entire /dev tree would not be that bad.

[debarshiray]

I don't have any /dev/ttyUSB* on my host currently. I suppose those are just files under /dev, and not sub-directories, right?

I think we should look at bind mounting the entire /dev. @rhatdan warned me that PTYs could cause problems, and I haven't looked into that.

[mildred]

I don't have any /dev/ttyUSB* on my host currently. I suppose those are just files under /dev, and not sub-directories, right?

Yes, directly under /dev, and they appear dynamically (when you plug an USB serial device). I was convinced for no good reason that it was impossible to share /dev inside the toolbox, but if you do this at the toolbox creation, it works

[mildred]

With PR #119, if I manually chown the device to my user/group on the host, I can access it from within the toolbox.

However, if I make myself part of the dialup group (the ttyUSB0 device is owned by root:dialup), the device appears as nobody:nobody in the toolbox and is inaccessible although it's accessible on the host.

[thawkins]

You should also support /dev/ttyACMx style devices too, they are often used for arduino, cnc, laser engraver and 3d Printer connections.

[debarshiray]

Now that PR #119 has been merged, this issue can be closed.

You should also support /dev/ttyACMx style devices too, they are often
used for arduino, cnc, laser engraver and 3d Printer connections.

New toolbox containers will have the entire /dev bind mounted from the host. So barring permission problems arising out of the files not being world accessible, things should be working now.