[geofft]

Which was, as it happens, the reason chroot was invented (to test the installer of newer versions of UNIX without having a brand-new physical system). Better tooling around chroot is absolutely useful.

I guess it's a misnomer to use the word "container", since that usually means things like Linux containers with security isolation almost as good as OS virtualization.

[iMil]

Right, the "container" word is now vastly associated to docker, yet I picked a word I know IT people will get and which is generic enough. I'll think on an alternative buzzword ;) Thanks for your support!

[ChristianBundy]

The word you're looking for is "chroot".