Using cvs add command in Ant to 'update' a module - eclipse

Question

Using ant through eclipse. What I'm trying to do is to add files or subdirectories to a module that already exists in the repository.
The problem is that I do not know (or shouldn't) what kind of files or subdirectories the script is going to find in the previously checked-out module.
Checksout module -> Modifies it (adding files, subsdirs) -> Add that module to the control version -> Commits
I'm making an approach like this:
<target name="checkout" >
<cvs cvsrsh="plink" cvsroot="${cvsroot}" package="${mymodule}" dest="${extract.dir}" command="checkout"/>
</target>
<target name="cvs_add" >
<cvs cvsrsh="plink" cvsroot="${cvsroot}" package="${mymodule}" dest="${extract.dir}" command="add -kb"/>
</target>
And getting this message:
[cvs] cvs add: in directory .:
[cvs] cvs [add aborted]: there is no version here; do 'cvs checkout' first
I also tried using ant-contrib's 'foreach', in order to navigate between files and subdirs, also not working.
I'd love a non-ant-contrib advice in this matter, or something not related with exec task. But I'm open minded.

Answer 1

I have came up with this solution:
<ac:for param="file">
<path>
<fileset dir="${mymodule}">
<!-- <include name="**/*.jar"/> -->
</fileset>
</path>
<sequential>
<local name="filename" />
<basename property="filename" file="#{file}"/>
<echo message="${filename}"/>
<cvs cvsrsh="plink" cvsroot="${cvsroot}" dest="${mymodule}" command="add -kb ${filename}"/>
</sequential>
</ac:for>
I finally surrender to ant-contrib. If anyone make a different approach, let me know.