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The old location keeps working because we create a symlink. The interesting part of this is that the sandbox now can't modify, remove or replace the file, and it is in a fixed position. This means that given a sandboxed pid, we can find this file as "/proc/$pid/root/.flatpak-info". This is very nice for two reasons: * We can use this instead of the cgroup to find out if a pid is sandboxed or not. This means we can drop the dependency on systemd --user for this. * We can get more information about the peer process that the app id. For instance, we can see what permissions the sandboxed app has.
Flatpak is a system for building, distributing and running sandboxed desktop applications on Linux.
See http://flatpak.org/ for more information.
Read documentation for the flatpak commandline tools and for the libflatpak library API.