Ant snippet for GAE rolling deployment

gistfile1.txt

	<target name="deploy-prod" depends="auth, optimize">
		<property name="appid" value="theappid" />
		<tstamp>
			<format property="vnum" pattern="yyyy-MM-dd-HHmm"/>
		</tstamp>

		<echo message="Deploying to version: ${vnum}" />

		<appcfg action="update" war="${staging.dir}">
			<options>
				<arg value="--oauth2" />
			    <arg value="--application=${appid}" />
				<arg value="--version=${vnum}" />
			</options>
		</appcfg>

		<get src="http://${vnum}.${appid}.appspot.com/ping" dest="${build.dir}/warmup-garbage" verbose="true" />
	</target>

	<target name="deploy-prod-switch" depends="deploy-prod">
		<appcfg action="set_default_version" war="${staging.dir}">
			<options>
				<arg value="--oauth2" />
			    <arg value="--application=${appid}" />
				<arg value="--version=${vnum}" />
			</options>
		</appcfg>
	</target>