How do I get the stuff

go get github.com/couchbaselabs/cbfs

And you'll find the source in $GOPATH/src/github.com/couchbaselabs/cbfs (and a cbfs binary should be in your path)

How do I build the stuff

cd $GOPATH/src/pkg/github.com/couchbaselabs/cbfs
go build

How do I run the stuff

mkdir -p /tmp/localdata
./cbfs -nodeID=$mynodeid \
       -bucket=cbfs \
       -couchbase=http://$mycouchbaseserver:8091/
       -root=/tmp/localdata \
       -viewProxy

The server will be empty at this point, you can install the monitor using cbfsclient (go get github.com/couchbaselabs/cbfs/tools/cbfsclient)

cbfsclient http://localhost:8484/ upload \
    $GOPATH/src/github.com/couchbaselabs/cbfs/monitor monitor

Then go to http://localhost:8484/monitor/