Using grails projects in Hudson

Being an agile software development company we use a continuous integration (CI) server like Hudson.
For our grails projects we wrote a simple ant target -call-grails to call the batch or the shell scripts:

    <condition property="grails" value="${grails.home}/bin/grails.bat">
        <os family="windows"/>
    </condition>
    <property name="grails" value="${grails.home}/bin/grails"/>

    <target name="-call-grails">
		<chmod file="${grails}" perm="u+x"/>
        <exec dir="${basedir}" executable="${grails}" failonerror="true">
            <arg value="${grails.task}"/>
            <arg value="${grails.file.path}"/>
            <env key="GRAILS_HOME" value="${grails.home}"/>
        </exec>
    </target>

Calling it is as easy as calling any ant target:

  <target name="war" description="--> Creates a WAR of a Grails application">
        <antcall target="-call-grails">
            <param name="grails.task" value="war"/>
            <param name="grails.file.path" value="${target.directory}/${artifact.name}"/>
        </antcall>
    </target>

One pitfall exists though, if your target takes no argument(s) after the task you have to use a different call:

	<target name="-call-grails-without-filepath">
		<chmod file="${grails}" perm="u+x"/>
        <exec dir="${basedir}" executable="${grails}" failonerror="true">
            <arg value="${grails.task}"/>
            <env key="GRAILS_HOME" value="${grails.home}"/>
        </exec>
    </target>