See this forum thread for more details: http://jayasoft.org/node/218
The following is from one message in that thread:
A resolver that wraps another resolver but also can invoke an ant build script for a dependency if an Ant script is available. The build script would be invoked at most once per build for each dependency. Something like this:
1. Need latest version for dependency "A".
2. Is there an Ant script for dependency "A"?
- If yes: invoke script if it has not yet been invoked for this build
3. Call wrapped resolver to actually retrieve the published artifact(s).
Note: I don't think this would apply if a specific version is being referenced - only if something like "test.integration" is being referenced?
The trick then would be to figure out if a) a dependency has an Ant build script, b) where the script is located, and c) what target to call on the script.
Then, all I do is tell Ivy to resolve in my main Ant build and it will do the rest to ensure that all my dependencies are up-to-date.