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nixos-rebuild: Don’t reset the experimental features #123246

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merged 1 commit into from May 16, 2021

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thufschmitt
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Motivation for this change

Make sure that the Nix experimental-features set by a user aren’t overwritten when running nixos-rebuild --flake by using --extra-experimental-features rather than --experimental-features.

Fix NixOS/nix#4784

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.

Make sure that the Nix `experimental-features` set by a user aren’t overwritten when running `nixos-rebuild --flake` by using `--extra-experimental-features` rather than `--experimental-features`.

Fix NixOS/nix#4784
@teto
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teto commented May 16, 2021

does --extra-X append to --X ? if yes LGTM

@thufschmitt
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does --extra-X append to --X ? if yes LGTM

Yep’, see https://nixos.org/manual/nix/unstable/command-ref/conf-file.html?highlight=extra-#description

@domenkozar domenkozar merged commit e9d4e7f into NixOS:master May 16, 2021
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"experimental feature 'ca-derivations' is disabled" even though it is enabled
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