runit/dnscache setup for OS X

djbdns-osx-dscl.sh

#!/bin/sh

# taken from http://qmail.jms1.net/djbdns/osx.shtml
# find appropriate uid/gids by $ dscl . -list /Users UniqueID  | sort -n -k2

# if you are working with a directory services path other than the
# local machine, put the correct path here.
DSPATH="."

# if you need different numeric UID/GID values, set them here
NGID="300"              # for group djbdns
RUID="300"              # for user dnsrun
LUID="301"              # for user dnslog

dscl "$DSPATH" create /Groups/djbdns PrimaryGroupID $NGID

dscl "$DSPATH" create /Users/dnsrun UniqueID $RUID
dscl "$DSPATH" create /Users/dnsrun PrimaryGroupID $NGID
dscl "$DSPATH" create /Users/dnsrun UserShell /bin/false
dscl "$DSPATH" create /Users/dnsrun NFSHomeDirectory /nohome
dscl "$DSPATH" create /Users/dnsrun RealName dnsrun

dscl "$DSPATH" create /Users/dnslog UniqueID $LUID
dscl "$DSPATH" create /Users/dnslog PrimaryGroupID $NGID
dscl "$DSPATH" create /Users/dnslog UserShell /bin/false
dscl "$DSPATH" create /Users/dnslog NFSHomeDirectory /nohome
dscl "$DSPATH" create /Users/dnslog RealName dnslog

dscl "$DSPATH" create /Groups/djbdns GroupMembership dnsrun dnslog

launchd config for runit

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
        <dict>
                <key>Label</key>
                <string>org.smarden.runit</string>
                <key>ServiceDescription</key>
                <string>runit</string>
                <key>ProgramArguments</key>
                <array>
                        <string>/opt/local/bin/runsvdir</string>
                        <string>/opt/local/var/service</string>
                        <string>................................</string>
                </array>
                <key>OnDemand</key>
                <false/>
                <key>WorkingDirectory</key>
                <string>/opt/local/var/service</string>
                <key>EnvironmentVariables</key>
                <dict>
                        <key>PATH</key>
                        <string>/opt/local/bin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin</string>
                </dict>
        </dict>
</plist>

$ sudo mkdir -p /opt/local/var/service
$ sudo /opt/local/bin/dnscache-conf dnsrun dnslog /opt/local/var/dnscache 127.0.0.1
$ sudo ln -nsf /opt/local/var/dnscache /opt/local/var/service/dnscache
$ sudo cp launchd-config-for-runit.plist /Library/LaunchDaemons/org.smarden.runit.plist
$ sudo launchctl load /Library/LaunchDaemons/org.smarden.runit.plist
$ sudo launchctl start org.smarden.runit