pg_autovacuum rc for FreeBSD

/usr/ports/databases/postgresql-contrib comes with the very useful (until 8.1, anyway) pg_autovacuum daemon, but no rc script. Here's one I whipped up:

/usr/local/etc/rc.d/019.pg_autovacuum.sh

#!/bin/sh
#
# PROVIDE: pg_autovacuum
# REQUIRE: postgresql
# KEYWORD: FreeBSD shutdown

# Add the following line to /etc/rc.conf to enable `pg_autovacuum':
#
# pg_autovacuum_enable="YES"
#
#

. /etc/rc.subr


pg_autovacuum_enable=${pg_autovacuum_enable:-"NO"}
pg_autovacuum_flags=${pg_autovacuum_flags:-"-v 300 -V 0.5"}

name=pg_autovacuum
rcvar=`set_rcvar`
command=/usr/local/bin/pg_autovacuum
load_rc_config ${name}
command_args="-D ${pg_autovacuum_flags}"
pg_autovacuum_user=pgsql

run_rc_command "$1"

I did submit a PR with this by way of send-pr, but it doesn't seem to have ended up in the PR repository. I'm not sure what to do about that, as it's the recommended way to submit PRs!