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Maximilian Bosch 2b02ce0e48
libexpr: throw a more helpful eval-error if a builtin is not available due to a missing feature-flag
I found it somewhat confusing to have an error like

    error: attribute 'getFlake' missing

if the required experimental-feature (`flakes`) is not enabled. Instead,
I'd expect Nix to throw an error just like it's the case when using e.g. `nix
flake` without `flakes` being enabled.

With this change, the error looks like this:

    $ nix-instantiate -E 'builtins.getFlake "nixpkgs"'
    error: Cannot call 'builtins.getFlake' because experimental Nix feature 'flakes' is disabled. You can enable it via '--extra-experimental-features flakes'.

           at «string»:1:1:

                1| builtins.getFlake "nixpkgs"
                 | ^

I didn't use `settings.requireExperimentalFeature` here on purpose
because this doesn't contain a position. Also, it doesn't seem as if we
need to catch the error and check for the missing feature here since
this already happens at evaluation time.
2021-09-29 11:57:15 +02:00
.github
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doc/manual Quiet 2021-09-22 14:12:31 +02:00
m4
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scripts fix install on macOS monterey 2021-09-21 13:38:29 -05:00
src libexpr: throw a more helpful eval-error if a builtin is not available due to a missing feature-flag 2021-09-29 11:57:15 +02:00
tests Revert "Merge pull request #4922 from nrdxp/default-submodules" 2021-09-22 17:25:25 +02:00
.dir-locals.el
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flake.nix flake: Use the real nixUnstable from nixpkgs 2021-09-20 14:37:09 +02:00
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Nix

Open Collective supporters Test

Nix is a powerful package manager for Linux and other Unix systems that makes package management reliable and reproducible. Please refer to the Nix manual for more details.

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On Linux and macOS the easiest way to install Nix is to run the following shell command (as a user other than root):

$ curl -L https://nixos.org/nix/install | sh

Information on additional installation methods is available on the Nix download page.

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See our Hacking guide in our manual for instruction on how to build nix from source with nix-build or how to get a development environment.

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