System

+-------+    +- VirtualBox ---------+
|       |    |           +- QEMU -+ |
| Local | -> | Ubuntu -> |  ARM   | |
|       |    |           | Ubuntu | |
+-------+    |           +--------+ |
             +----------------------+

Build VirtualBox VM

$ vagrant up

Start QEMU

$ vagrant ssh
$ ~/sync/qemu.sh

or after SSH is configured,

$ ssh -F .ssh_config default '~/sync/qemu.sh'

or

$ make qemu

Wait until Cloud-init v. X.Y.Z finished at ... appers. You cannot login with username and password.

Login to ARM Ubuntu on QEMU

On another local terminal,

$ vagrant ssh
$ ssh -p 2222 vagrant@localhost

or after SSH is configured,

$ vagrant ssh
$ ssh arm

or

$ ssh -F .ssh_config arm

Configure SSH

After starting QEMU, on local terminal,

$ ./setup_ssh.sh

Provision ARM Ubuntu

After first login to ARM Ubuntu, execute ~/sync/arm_provision.sh to provision. Then please logout and login back.

Sync files between local and ARM Ubuntu

A command

$ make arm-sync

... synchonizes sync directory between local environment and ARM Ubuntu on QEMU.

This way is tentative. The sharing will be automated in the future.