nixos-enter cannot be used reliably

[RaitoBezarius]

Describe the bug

nixos-enter is an important tool to repair / debug NixOS systems externally.

Alas, since Nix 2.11 (and probably before for other reasons on other things), it is not reliable and cannot be used without extensive Nix knowledge to workaround its quirks.

Steps To Reproduce

Steps to reproduce the behavior:

1. nixos-enter --root /mnt
2. Run any nix-related commands
3. Experiment an "in-chroot" but "unpivoted from /mnt" situation

Expected behavior

nix should work as expected at least, I am not talking about systemd-related stuff.

Notify maintainers

nixos-install-tools has no maintainers.

see NixOS/nix#7602

[VincentVanlaer]

For context, while the bug in my opinion is not caused by nixos-enter, there is a way to modify nixos-enter that works around the issue. The patch for that can be found in NixOS/nix#7602 . I'm happy to make a PR with that patch if desired.