Comment 2 for bug 911184

It lives in lp:linaro-license-protection in the scripts/ directory. The version being run lives in

  mombin.canonical.com:/home/android-build-linaro/scripts/jenkins-post-sftp.sh

The goal was to clean that up to do what you describe, and to also disallow overwriting of existing files (to ensure nothing can mess up previous build results). There was not enough time to come up with a proper variant to do all that at the time.