segfault authored Jan 04, 2021 and intrigeri committed Oct 12, 2022

Split the Persistent Storage app (formerly known as
tails-persistence-setup) into a backend and a frontend, both written in
Python. The frontend communicates with the backend via a D-Bus service.

New features:

* Support for activating Persistent Storage immediately, without
  rebooting (refs: #11529)

* Support for activating features selectively

* Support for mounting files

  live-boot only supported mounting directories, but it's actually useful
  to also be able to mount single files.

* Correctly handle error condition for feature activation with symlinks

  If a feature using symlinks is activated but the source directory is
  empty, an error is now returned, because there are no files which
  symlinks could be created for.