According to DHCPCD(8):
-U, --dumplease [interface]
Dumps the current lease for the interface to stdout. If no
interface is given then all interfaces are dumped. Use the -4 or
-6 flags to specify an address family. If a lease is piped in
via standard input then that is dumped. In this case, specifying
an address family is mandatory.
So piping in the actual lease should work. Having said that, dhcpcd -U6 alc0,
dhcpcd -U alc0, dhcpcd -U6, and dhcpcd -U all timeout:
beta# dhcpcd -U6 alc0
dhcpcd_readdumptimeout
beta# dhcpcd -U alc0
dhcpcd_readdumptimeout
beta# dhcpcd -U6
dhcpcd_readdumptimeout
beta# dhcpcd -U
dhcpcd_readdumptimeout
I understand not backporting it. I will live without being able to dump the
lease until then.
