subpatch operates on several key principles. It utilizes “git add” to incorporate subproject files into the superproject, treating them as normal files. The metadata is stored in a Git-config-style configuration file. subpatch supports modifications to subprojects, facilitating a linear patch stack, and simplifies the process of importing new versions and rebasing local modifications. If you are currently using git-submodules or Google’s repo tool and you are frustrated, subpatch is maybe interesting for you!