Thanks for the pointers.
@cdesai There doesn’t seem to be any occurrence of PRODUCT in your scripts - did you use some equivalent?
(also the XML bits generated by the rebuilds already use that script:)
/bin/bash -c "development/build/tools/mk_sdk_repo_xml.sh out/host/linux-x86/sdk/sdk_x86_64/repository.xml prebuilts/devtools/repository/sdk-repository-10.xsd build-tools linux out/host/linux-x86/sdk/sdk_x86_64//sdk-repo-linux-build-tools-userdebug.9.0.0_r33.zip:sdk-repo-linux-build-tools-userdebug.9.0.0_r33.zip platform-tools linux out/host/linux-x86/sdk/sdk_x86_64//sdk-repo-linux-platform-tools-userdebug.9.0.0_r33.zip:sdk-repo-linux-platform-tools-userdebug.9.0.0_r33.zip docs linux out/host/linux-x86/sdk/sdk_x86_64//sdk-repo-linux-docs-userdebug.9.0.0_r33.zip:sdk-repo-linux-docs-userdebug.9.0.0_r33.zip platforms linux out/host/linux-x86/sdk/sdk_x86_64//sdk-repo-linux-platforms-userdebug.9.0.0_r33.zip:sdk-repo-linux-platforms-userdebug.9.0.0_r33.zip samples linux out/host/linux-x86/sdk/sdk_x86_64//sdk-repo-linux-samples-userdebug.9.0.0_r33.zip:sdk-repo-linux-samples-userdebug.9.0.0_r33.zip sources linux out/host/linux-x86/sdk/sdk_x86_64//sdk-repo-linux-sources-userdebug.9.0.0_r33.zip:sdk-repo-linux-sources-userdebug.9.0.0_r33.zip"
Starting from a file from Google with a huge proprietary license on top doesn’t sound good.
Before rebuilding the XML this or that way, we need to be able to actually test it though 
I had made a quick skim in sdklibs, it’s a bit hard to figure things out, some of it is depracated, and some of the sdkmanager logic is in another subproject afaics.