[Nix-dev] How to upgrade when Nix is too old to evaluate nixpkgs

[Domen Kožar]

Did you try running switch? It should know how to upgrade Nix.

On Thu, Jun 30, 2016 at 5:10 PM, Bjørn Forsman <bjorn.forsman at gmail.com>
wrote:

> Hi all,
>
> I picked up an old NixOS installation from 2013, with nix 1.5.3. I
> tried to upgrade to NixOS 16.03:
>
>   $ nixos-rebuild build
>   ...
>   error: evaluation aborted with the following error message: `This
> version of Nixpkgs requires Nix >= 1.10, please upgrade! See
>
> https://nixos.org/wiki/How_to_update_when_Nix_is_too_old_to_evaluate_Nixpkgs
> '
>
> The wiki page suggests to download something from hydra that now
> yields a 404 error. I know the wiki is in read-only mode and NixOS
> documentation generally needs work, so I check hydra myself to find
> the correct URL:
>
>   http://hydra.nixos.org/build/37216316
>
> The problem is that none of the build artifacts can be downloaded!
> Every URL return a 404 error saying:
>
>   Path /nix/store/hmd2dzzsfan51snxgfy3ngmid5rvf08s-nix-1.11.2-debug is
> no longer available.
>
> (Going to builds a few weeks/months back gives the same error, just a
> different hash.)
>
> Suggestions?
>
> Best regards,
> Bjørn Forsman
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