如何动态添加Ivy到Ant

Question

Typically, to make Ivy tasks available to an Ant build, you need to:

1. Add ivy.jar to ${ANT_HOME}/lib .
2. Add an xmlns:ivy="antlib:org.apache.ivy.ant" declaration to your build.xml's <project> element.
3. Add a <taskdef> declaration inside build.xml that reference's the ivy.jar 's antlib.xml file where all other tasks are defined.

I'd like to accomplish all of the above except the first step (adding ivy.jar to ${ANT_HOME}/lib ). I'd like to have ivy.jar living somewhere inside my project, say, at lib/buildtime/ivy.jar , and somehow reference lib/buildtime/ivy.jar as where Ivy is located.

Is this possible? If so, how? If not, why? Thanks in advance!

Answer 1

The taskdef (step 3) is not required if the ivy jar is located in a standard ANT library directory.

I would recommend including a special "bootstrap" target that will install the ivy jar. Once this is done all other dependencies (including 3rd party ANT tasks) can be downloaded by ivy as a build dependency.

Here is my default build file that demonstrates the concept:

<project name="demo" default="resolve" xmlns:ivy="antlib:org.apache.ivy.ant">

    <target name="bootstrap" description="Install ivy">
        <mkdir dir="${user.home}/.ant/lib"/>
        <get dest="${user.home}/.ant/lib/ivy.jar" src="http://search.maven.org/remotecontent?filepath=org/apache/ivy/ivy/2.3.0/ivy-2.3.0.jar"/>
    </target>

    <target name="resolve" description="Use ivy to resolve classpaths">
        <ivy:resolve/>

        <ivy:report todir='build/ivy-reports' graph='false' xml='false'/>

        <ivy:cachepath pathid="compile.path" conf="compile"/>
        <ivy:cachepath pathid="test.path"    conf="test"/>
    </target>

    <target name="clean" description="Cleanup build files">
        <delete dir="build"/>
    </target>

    <target name="clean-all" depends="clean" description="Additionally purge ivy cache">
        <ivy:cleancache/>
    </target>

</project>

Notes:

• The "bootstrap" target only needs to be run once on a new development environment. Once installed the ivy jar is available to all future ANT runs.
• This example doesn't use "$ANT_HOME/lib" (which you may not have write permissions for). Instead it uses the lesser known "$HOME/.ant/lib" directory which serves the same purpose.