Include ant modified selector based on condition

Question

I am modifying my exiting ant script to support differential builds. For that I have used modified selector in fileset for finding only modified files. But the problem is when I am doing full build I need to bypass modified filter based on some property or param. As shown below. Is there anyway to do that.

<project name="test" default="dt" basedir=".">
    <target name="dt1">
        <copy todir="ant_temp2">
            <fileset dir="ant_temp1">
                <if>
                    <equals arg1="${ABC}" arg2="true" />
                    <then>
                        <modified update="true" />
                    </then>
                </if>
                <exclude name="*.txt"/>
            </fileset>
        </copy>
    </target>

    <target name="dt">
        <antcall target="dt1">
            <param name="ABC" value="true" />
        </antcall>
    </target>

    <target name="dt2">
        <antcall target="dt1" />    
    </target>
</project>

If I invoke the above ant script using dt target then I need to consider modified and the exclude in fileset task. If it is invoke using dt2 then I need to consider only exclude in the fileset task.

I am not able to use the above script beacuse fileset does not support nested if task. That's why I am looking for alternative way to do this. Please suggest some ways to do this.

P.S: I don't want to create the two targets with the same copy task one with including modified and exclude in fileset and another target with only exclude .

Answer 1

I have used below ant script to achieve my requirements.

<project name="test" default="dt" basedir=".">
    <patternset  id="fs1">
        <exclude name="*.txt"/>
    </patternset >

    <target name="dt1">
        <copy todir="ant_temp2">
            <fileset dir="ant_temp1">
                <patternset refid="fs1" />
            </fileset>
        </copy>
    </target>

    <target name="dt3">
        <copy todir="ant_temp2">
            <fileset dir="ant_temp1">
                <modified update="true" />
                <patternset refid="fs1" />
            </fileset>
        </copy>
    </target>
</project>

I have created reusable pattern set and developers will update their exclusions in that pattern set and i am reusing that pattern sets for normal and incremental builds.

Answer 2

You can use if and unless attributes on targets to make their execution conditional on a property. You should move the conditional part to its own target (if not already done) and then add an if or unless condition to the target.

I'm not completely clear from your example, but this might mean having the copy in two targets, including the modified part in only one of them. In that case, you could make each target conditional on the same property - one as if the other as unless.