Filesystem of the keys

[Rafiot]

Source key

Whatever the format of the key, the script needs the read rights (and only those one) for the copy. We might have to change the permissions as root.

Destination key

The copy only works if the destination key is formatted in vfat (fat32).

To support other file systems, we have to make sure the permissions are correct and the script has the proper rights to write on the stick.

The clean way to support it is to run different mount options based on the FS type, and if needed to run chown on the key.
Important thing there: making sure everybody can R/W all the documents on the output key: the user needs full right on thie key, whatever his uid/gid on his computer is: "other" on ext* has to be rw.

A nice to have is making sure the execution rights are removed from everything (except directories).