Thiago Kenji Okada
0dce56f3f5
When `path://` or `git+file://` protocol is used in Flake mode (that is the most common case since we normalize the paths, see PR #375493) and the current working directory in a symlink pointing base store path to the Nix store (e.g., /run/opengl-driver/lib), there is a nasty bug where Nix resolves the path as the Nix store path of the current derivation instead of the target derivation. Since we blindly activate this path, this can corrupt the installation and break some other activation scripts, like `systemd-boot-builder.py`. While it is possible to recover this situation using `nix-env -p /nix/var/nix/profiles/system --delete-generations old`, this is far from ideal. This commit solves it by validating that the resolved NixOS configuration path includes at least `$out/nixos-version`. I am not sure if this is going to break some cases so there is a escape hatch in the form of the environment variable `NIXOS_REBUILD_I_UNDERSTAND_THE_CONSEQUENCES_PLEASE_BREAK_MY_SYSTEM`, but in general it looks safe.
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