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nixpkgs/shell.nix
Robert Hensing 5407a105c8 shell.nix: Support nix-shell -A
It used to be that `nix-shell -A hello` would launch the build shell
for the `hello` package.
By adding `/shell.nix`, that stopped working, as all versions of
`nix-shell` resolve the unspecified file to `$PWD/shell.nix` if it
exists, and now it does.

I have to admit that this use of `//` is not pretty, but the UX/DX
hard to match.
2024-11-02 23:51:41 +01:00

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Nix

# A shell to get tooling for Nixpkgs development
#
# Note: We intentionally don't use Flakes here,
# because every time you change any file and do another `nix develop`,
# it would create another copy of the entire ~500MB tree in the store.
# See https://github.com/NixOS/nix/pull/6530 for the future
#
# Note: We use a pinned Nixpkgs so that the tools are readily available even
# when making changes that would otherwise require a new build of those tools.
# If you'd like to test out changes to the tools themselves, you can pass
#
# nix-shell --arg nixpkgs ./.
#
{
system ? builtins.currentSystem,
nixpkgs ? null,
}:
let
inherit (import ./ci { inherit nixpkgs system; }) pkgs;
# For `nix-shell -A hello`
curPkgs = builtins.removeAttrs (import ./. { inherit system; }) [
# Although this is what anyone may expect from a `_type = "pkgs"`,
# this file is intended to produce a shell in the first place,
# and a `_type` tag could confuse some code.
"_type"
];
in
curPkgs
// pkgs.mkShellNoCC {
packages = with pkgs; [
# The default formatter for Nix code
# See https://github.com/NixOS/nixfmt
nixfmt-rfc-style
# Helper to review Nixpkgs PRs
# See CONTRIBUTING.md
nixpkgs-review
];
}