Usual nncp-xfer command requires filesystem it can operate on. That presumes random access media storage usage, like hard drives, USB flash drives and similar. But media like CD-ROM and especially tape drives are sequential by nature. You can prepare intermediate directory for recording to CD-ROM disc/tape, but that requires additional storage and is inconvenient.
Bundles, created with nncp-bundle command are convenient
alternative to ordinary
nncp-xfer. Bundle is just a collection
of encrypted packets, stream of packets. It could be
sequentially streamed for recording and digested back.
$ nncp-bundle -tx SOMENODE | cdrecord -tao - # record directly to CD $ nncp-bundle -tx SOMENODE | dd of=/dev/sa0 bs=10240 # record directly to tape $ dd if=/dev/cd0 bs=2048 | nncp-bundle -rx # read directly from CD $ dd if=/dev/sa0 bs=10240 | nncp-bundle -rx # read directly from tape
zpool exportand struggling with file permissions.
$ nncp-bundle -tx SOMENODE | dd of=/dev/da0 bs=1M # record directly to # hard/flash drive $ dd if=/dev/da0 bs=1M | nncp-bundle -rx # read directly from drive
Technically bundle is valid POSIX.1-2001
with directory/files hierarchy identical to that is used in
nncp-xfer: NNCP/RECIPIENT/SENDER/PACKET. So bundle can also
be created by manual tar-ing of
nncp-xfer resulting directory.