Ivy custom url resolver - ant

Question

I am trying to create custom resolver in my ivysettings.xml file:
<ivysettings>
<settings defaultResolver="default"/>
<resolvers>
<chain name="default">
<url name="scala-tools">
<ivy pattern="http://scala-tools.org/repo-releases/[organisation]/[module]/[revision]/ivy-[revision].xml" />
<artifact pattern="http://scala-tools.org/repo-releases/[organisation]/[module]/[revision]/[artifact]-[revision].[ext]"/>
<artifact pattern="http://scala-tools.org/repo-releases/[organisation]/[module]/[revision]/[artifact].[ext]"/>
</url>
<!--<ibiblio name="ibiblio"/>-->
</chain>
</resolvers>
</ivysettings>
As you can see, I have just one UrlResolver that will try to find my dependencies in scala-tools repo. If I specify my dependencies correctly than ivy will try to find it in http://scala-tools.org/repo-releases/org.scala-lang/scala-library/2.8.0/scala-library-2.8.0.jar and http://scala-tools.org/repo-releases/org.scala-lang/scala-library/2.8.0/scala-library.jar (yep, according to my instructions in ivysettings.xml) Obviously, it doesn't find anything. To get thing working I must specify dependencies in this way:
<ivy-module version="2.2">
<info organisation="org.yoba" module="Yoba"/>
<dependencies>
<dependency org="org/scala-lang" name="scala-library" rev="2.8.0"/>
<!--<dependency org="org.scala-lang" name="scala-library" rev="2.8.0"/>-->
<dependency org="org/scala-lang" name="scala-compiler" rev="2.8.0"/>
<!--<dependency org="org.scala-lang" name="scala-compiler" rev="2.8.0"/>-->
</dependencies>
</ivy-module>
Q:How to change artifact pattern / something else to force ivy to make it's job right way?
1: http://scala-tools.org/repo-releases/ scala-tools repo

Answer 1

ivy.xml
I checked the POM for scala-compiler and discovered that it references the module scala-library. This means only need one dependency declaration is required in the ivy file:
<ivy-module version="2.0">
<info organisation="org.yoba" module="Yoba"/>
<dependencies>
<dependency org="org.scala-lang" name="scala-compiler" rev="2.8.0" conf="default"/>
</dependencies>
</ivy-module>
The version number needs to be "2.0"
Included the default mapping to avoid downloading the optional dependencies
ivysettings.xml
I recommend using the ibiblio resolver when downloading from any Maven compliant repository.
<ivysettings>
<settings defaultResolver="scalatools"/>
<resolvers>
<ibiblio name="scalatools" root="http://scala-tools.org/repo-releases" m2compatible="true"/>
</resolvers>
</ivysettings>
If you need to download other libraries the settings file can be enhanced, so that ivy only retrieves the scala modules from the scala repository
<ivysettings>
<settings defaultResolver="central"/>
<resolvers>
<ibiblio name="central" m2compatible="true"/>
<ibiblio name="scalatools" root="http://scala-tools.org/repo-releases" m2compatible="true"/>
</resolvers>
<modules>
<module organisation="org.scala-lang" resolver="scalatools"/>
</modules>
</ivysettings>