How do I have sbt's Jetty use a local domain name? - scala

Question

I'd like the version of Jetty launched by sbt> ~jetty to listen on my.name.local, which I've set to 127.0.0.1 in /etc/hosts. It seems to be possible to change Jetty's settings from within sbt.
Here's what I have for my project:
import sbt._
class LiftProject(info: ProjectInfo) extends DefaultWebProject(info) {
// ...
val jetty = "org.eclipse.jetty" % "jetty-webapp" % "7.3.0.v20110203" % "test"
override lazy val jettyInstance = new JettyRunner(customJettyConfiguration)
def customJettyConfiguration = {
val myLog = log
val myJettyClasspath = jettyClasspath
val myScanDirectories = scanDirectories
val myScanInterval = scanInterval
new CustomJettyConfiguration {
def classpath = jettyRunClasspath
def jettyClasspath = myJettyClasspath
def war = jettyWebappPath
def contextPath = jettyContextPath
def classpathName = "test"
def parentLoader = buildScalaInstance.loader
def scanDirectories = Path.getFiles(myScanDirectories).toSeq
def scanInterval = myScanInterval
def port = jettyPort
def log = myLog
override def jettyConfigurationXML =
<Configure class="org.eclipse.jetty.webapp.WebAppContext">
<Set name="virtualHosts">
<Array type="java.lang.String">
<Item>my.name.local</Item>
</Array>
</Set>
</Configure>
}
}
}
While it seems to launch without complaints, visiting my.name.local doesn't hit Jetty as far as I can tell.

Answer 1

Rather than running sbt as root (dangerous), I personally prefer rerouting port 80 to 8080 using iptables on Linux :
sudo iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 8080
Which works only until the next reboot. To make the setting persistent on Ubuntu 10.04, I use :
sudo bash -c "iptables-save > /etc/iptables.rules"
echo "#!/bin/sh
iptables-restore < /etc/iptables.rules
exit 0
" > /etc/network/if-pre-up.d/iptablesload
echo "#!/bin/sh
iptables-save -c > /etc/iptables.rules
if [ -f /etc/iptables.downrules ]; then
iptables-restore < /etc/iptables.downrules
fi
exit 0
" > /etc/network/if-post-down.d/iptablessave
chmod +x /etc/network/if-post-down.d/iptablessave
chmod +x /etc/network/if-pre-up.d/iptablesload
(see this Ubuntu iptables wiki)

Answer 2

I posted too soon. All I need to do is override jettyPort:
override def jettyPort = 80
And run sbt via sudo.