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stdenv/check-meta: Advertise the NIXPKGS_ALLOW_* environment variables #81990

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@jakobrs jakobrs commented Mar 7, 2020

Motivation for this change

This seemed like a reasonable addition whose absence has bothered me for a while.

What’s new

The error raised when trying to build a package marked as broken, insecure or unfree, or that is not supported on your system, will tell you about the environment variable you can set to ignore the error. Example:

error: Package ‘apple-framework-Foundation’ in /home/jakob/nixpkgs/pkgs/os-specific/darwin/apple-sdk/default.nix:137 is not supported on ‘x86_64-linux’, refusing to eva
luate.

a) For `nixos-rebuild` you can set
  { nixpkgs.config.allowUnsupportedSystem = true; }
in configuration.nix to override this.

b) For `nix-env`, `nix-build`, `nix-shell` or any other Nix command you can add
  { allowUnsupportedSystem = true; }
to ~/.config/nixpkgs/config.nix, or you can set the NIXPKGS_ALLOW_UNSUPPORTED_SYSTEM environment variable.

(use '--show-trace' to show detailed location information)
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/) N/A
  • Determined the impact on package closure size (by running nix path-info -S before and after) N/A
  • Ensured that relevant documentation is up to date (I think)
  • Fits CONTRIBUTING.md.

Advertises the relevant NIXPKGS_ALLOW_* environment variable in the
error message that is presented whenever someone tries to build a
broken, unfree, or insecure package, or tries to build a package on an
unsupported system.
@jakobrs jakobrs force-pushed the idontknowwhattonamethisbranch branch from 3d8fe05 to 508fcae Compare March 7, 2020 20:36
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stale bot commented Sep 4, 2020

Hello, I'm a bot and I thank you in the name of the community for your contributions.

Nixpkgs is a busy repository, and unfortunately sometimes PRs get left behind for too long. Nevertheless, we'd like to help committers reach the PRs that are still important. This PR has had no activity for 180 days, and so I marked it as stale, but you can rest assured it will never be closed by a non-human.

If this is still important to you and you'd like to remove the stale label, we ask that you leave a comment. Your comment can be as simple as "still important to me". But there's a bit more you can do:

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@stale stale bot added the 2.status: stale https://github.com/NixOS/nixpkgs/blob/master/.github/STALE-BOT.md label Sep 4, 2020
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2.status: stale https://github.com/NixOS/nixpkgs/blob/master/.github/STALE-BOT.md 6.topic: stdenv Standard environment 10.rebuild-darwin: 0 10.rebuild-linux: 0
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