Copying files between Linux and CO-IDRIS may be done using mtools.
The diskette image used by mtools is mounted by the MS-DOS VM in VirtualBox.

Example to copy a directory from Linux to CO-IDRIS.

Create tar file on Linux and copy to virtual DOS diskette:

$ tar --old-archive -cvf example.tar example/
...
$ mcopy example.tar a:

In CO-IDRIS import the tar file and extract it:

# import -b -o example.tar a:example.tar
# tar +d -x -v -f example.tar