context: add open_device_with_fd()

[elmarco]

See API documentation for details.

[a1ien]

I think this function must be unsafe. And also #34
How I said I don't like this api, but if you describe why it's worth to implement I can add

[elmarco]

Agree, the function should probably be unsafe, similar to other FromRawFd Rust APIs.

Regarding ownership, we can document it that the DeviceHandle will own and close the fd on close/Drop.

It is a useful function, not only for Android, but on Linux. You can write a privileged process that open the USB device and give it to a user (spice-gtk had to modify ACL/permission on the file to do that in the past, but we can do better now, this has several advantages over the current approach) Thanks

[elmarco]

@a1ien ping, thanks

[a1ien]

LGTM. Thanks

[elmarco]

Thanks!