Adding new Persistent Storage features

Take these steps to add a new preset feature to the Persistent Storage:

1. Add a new Feature subclass to config/chroot local-includes/usr/lib/python3/dist-packages/tps/configuration/features.py.

2. Add a new Feature subclass to config/chroot local-includes/usr/lib/python3/dist-packages/tps frontend/views/features view.py.

3. Add a new HdyActionRow child to the GtkListBox of the corresponding section you want to add the feature to.

You might need to add on-activated/on-deactivated hooks:

• config/chroot local-includes/usr/local/lib/persistent-storage/on-activated-hooks

• config/chroot local-includes/usr/local/lib/persistent-storage/on-deactivated-hooks

If you do, it's important that all privileged accesses of paths which are writable by an unprivileged user (e.g. amnesia) are done via the /run/nosymfollow mountpoint to avoid symlink attacks. For more information, see the section on symlink attacks in persistence.

Note that's is possible that on-activated hooks are run multiple times without the on-deactivated hooks being run in between, so they must handle that case gracefully.