How to start/stop database from rake?

Hello,

I would like to start the database server (postgres) before tests are run and stop it afterwards. For this, I have created a little wrapper around rake:

   $ cat run-rake    #! /bin/sh        DB=`pwd`/db/pgdata        # init database cluster if it does not exist yet    [ -d $DB ] || initdb -D$DB        # start the database server    pg_ctl -D$DB -o "-h '' -k $DB" -l postgreslog start       # wait for it to accept connections    sleep 1        # run rake with original arguments    rake "$*"        # we're done, stop database server again    pg_ctl -D$DB -o "-h '' -k $DB" -l postgreslog stop

But this doesn't "feel" like RoR, So I'd like to integrate it into rake, so I can say "rake foobar" instead of "run-rake foobar"

Any hints?