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Remove nix fallback paths #471439
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6.topic: hygieneCleaning up and removing cruftCleaning up and removing cruft6.topic: nixosIssues or PRs affecting NixOS modules, or package usability issues specific to NixOSIssues or PRs affecting NixOS modules, or package usability issues specific to NixOS9.needs: upstream fixThis PR needs upstream to change somethingThis PR needs upstream to change something
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6.topic: hygieneCleaning up and removing cruftCleaning up and removing cruft6.topic: nixosIssues or PRs affecting NixOS modules, or package usability issues specific to NixOSIssues or PRs affecting NixOS modules, or package usability issues specific to NixOS9.needs: upstream fixThis PR needs upstream to change somethingThis PR needs upstream to change something
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IIUC, the nix fallback paths provided a way for
nixos-rebuildto bootstrap a new Nix evaluation of Nix in case the new Nix expression for Nix did not evaluate under the current Nix.While a degree of paranoia around upgrade robustness is of course warranted, I don't believe we have needed this in this decade, and indeed the new
nixos-rebuildimplementation does not implement this functionality.However
nixos/modules/installer/tools/nix-fallback-paths.nixremains.Should it?
cc @edolstra @NixOS/nix-team