1 Isolate NixOS QEMU VMs from each other and from the host by using a
2 squashfs for the VM's /nix/store that contains only the VM's dependencies
3 (like the installer has) rather than a virtio mount of the host's entire
6 **Update:** `virtualisation.useNixStoreImage` exists now! But it doesn't
7 work! :( See the note in `checks/mount-grep.nix`