nixos-rebuild: try to get Nix fallback from new channel first #56115
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If our old Nix can’t evaluate the Nixpkgs channel, try the fallback from the new channel /first/. That way we can upgrade Nix to a newer version and support breaking changes to Nix (like seen in the upgrade o Nix 2.0). This change should be backported to older NixOS versions!
matthewbauer
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GrahamcOfBorg
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6.topic: nixos
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If our old Nix can’t evaluate the Nixpkgs channel, try the fallback
from the new channel /first/. That way we can upgrade Nix to a newer
version and support breaking changes to Nix (like seen in the upgrade
o Nix 2.0).
This change should be backported to older NixOS versions! It would enable users to go from pre-Nix 2.0 NixOS to NixOS requiring 2.0.
Using this patch I was able to update from NixOS 17.09 to NixOS 19.03pre.