Flatpak in linux uses bubblewrap (namespaces, cgroups, bindmounts, seccomp, basically the same tech behind containers), and constructs /usr based on the framewo

Flatpak in linux uses bubblewrap (namespaces, cgroups, bindmounts, seccomp, basically the same tech behind containers), and constructs /usr based on the frameworks the application requires in its manifest. On the disk, it boils down to a single copy of each framework required. Additionally, the flatpak repository is content addressable, the constructed directory trees are hardlinks to the repository, so multiple versions or even separate frameworks will share identical files.