This script queries ZFS for passphrase-prompt volumes, and then attempts to locate and load keys for those volumes via a naming scheme:
$HOSTNAME.$POOLNAME.$VOLUMEPATH.zfs
slashes are replaced with dots, and dot-segments are dropped until a keyfile
is found or there are no more segments. The text of the keyfile is piped
directly to zfs load. Currently, only fetching keys via curl is supported.