Source handlers are used to pull sources from the location specified in the part definition into the part source work directory. They may provide a method to update specific files that have been modified without re-pulling the entire source tree. Changes were introduced in 5d56713 to allow removal of pulled files that have been deleted in the part source. The local source handler, however, is not used only for the primary source handler purpose, it's also used to migrate contents from the source work directory to the build work directory, regardless of the type of the part's source. (We should investigate how to refactor this to use the migration mechanisms directly without reusing the source handler.) As a consequence of the way deleted file removal was implemented and the reuse of the local source handler for build migration, artifacts created during the build process were removed in a source update. Deleted file updates should cover only files removed from the original source without affecting build artifacts. Refactor source handlers to preserve build artifacts by removing only entries present in the source work directory that are not in the original source from the build work directory. In the long term part handling should be refactored to be decoupled from the local source handler. Signed-off-by: Claudio Matsuoka <claudio.matsuoka@canonical.com> - [x] Have you signed the [CLA](http://www.ubuntu.com/legal/contributors/)? -----