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Portsnap is a system for securely updating the ports tree by
distributing signed compressed snapshots.  This is the client
half of that system; it downloads compressed snapshots into
/usr/local/portsnap ("portsnap fetch") and uses those to extract
a ports tree into /usr/ports ("portsnap extract") or update an
existing tree ("portsnap update").

In addition to operating entirely over HTTP, portsnap can use under
a tenth of the bandwidth required by CVSup if a copy of the ports
tree is being updated every few days.

WWW: http://www.daemonology.net/portsnap/

- Colin Percival
cperciva@daemonology.net