Apache Ivy: Resolve dependency using a pattern - ant

Question

I want to download artifacts using ivy:resolve, but using a pattern that uses the [conf] attribute. So I have defined the following in
IvySettings.xml
<caches defaultCacheDir="${env.IvyLib}\cache" artifactPattern="[conf]\[artifact].[ext]" checkUpToDate="false" />
Notice the pattern artifactPattern="[conf]\[artifact].[ext]", so I want to resolve the dependencies and place them in a folder as per their configuration. I have defined the following configuration in
Ivy.xml
<configurations>
<conf name="ConfGroup1" description="First group of dependencies"/>
<conf name="ConfGroup2" description="Second group of dependencies"/>
</configurations>
<dependencies>
<dependency org="derby-db" name="derby-db" rev="10.2.2.0" conf="ConfGroup1->default">
<artifact name="derby-db" type="zip" ext="zip" />
</dependency>
<dependency org="derby-db" name="derby-db" rev="10.4.1.3" conf="ConfGroup2->default">
<artifact name="derby-db" type="zip" ext="zip" />
</dependency>
</dependencies>
Now the dependencies get resolved fine, but only 1 folder gets created for configuration: default. No folder is being created for ConfGroup1 & ConfGroup2 configurations. How can I be able to create multiple folders as per my defined configurations during resolve?
P.S., I know this can be achieved using ivy:retrieve, but I do not want to use it, because it will involve copying artifacts from ivy cache to another place after ivy:resolve, and I have multi-gigabyte worth of artifacts. Copying them separately will create additional overhead during the build, which I cannot afford due to the project requirements.

Answer 1

The ivy retrieve task has a symlinks option, that can be used to conserve space.
Example
├── build.xml
├── ivysettings.xml
├── ivy.xml
└── target
├── ivy-reports
│   ├── ivy-report.css
│   ├── myorg-mymod-ConfGroup1.html
│   └── myorg-mymod-ConfGroup2.html
└── lib
├── ConfGroup1
│   └── db-derby-10.12.1.1.zip -> /home/mark/.ivy2/cache/db-derby/db-derby/zips/db-derby-10.12.1.1.zip
└── ConfGroup2
└── db-derby-10.11.1.1.zip -> /home/mark/.ivy2/cache/db-derby/db-derby/zips/db-derby-10.11.1.1.zip
build.xml
<project name="demo" default="resolve" xmlns:ivy="antlib:org.apache.ivy.ant">
<property name="build.dir" location="target"/>
<target name="resolve">
<ivy:resolve/>
<ivy:report todir='${build.dir}/ivy-reports' graph='false' xml='false'/>
<ivy:retrieve pattern='${build.dir}/lib/[conf]/[module]-[revision].[ext]' symlink="true"/>
</target>
</project>
ivy.xml
<ivy-module version="2.0">
<info organisation="myorg" module="mymod"/>
<configurations>
<conf name="ConfGroup1" description="First group of dependencies"/>
<conf name="ConfGroup2" description="Second group of dependencies"/>
</configurations>
<dependencies>
<dependency org="db-derby" name="db-derby" rev="10.12.1.1" conf="ConfGroup1->default">
<artifact name="db-derby" type="zip" ext="zip" />
</dependency>
<dependency org="db-derby" name="db-derby" rev="10.11.1.1" conf="ConfGroup2->default">
<artifact name="db-derby" type="zip" ext="zip" />
</dependency>
</dependencies>
</ivy-module>
ivysettings.xml
<ivysettings>
<settings defaultResolver="central"/>
<resolvers>
<ibiblio name="central" m2compatible="true" />
<url name="db-derby">
<artifact pattern="http://ftp.heanet.ie/mirrors/www.apache.org/dist//db/derby/[module]-[revision]/[module]-[revision]-bin.[ext]"/>
</url>
</resolvers>
<modules>
<module organisation="db-derby" resolver="db-derby" />
</modules>
</ivysettings>