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# 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 ? (
# On 26.05 we need a CI-pinned Nixpkgs revision that supports x86_64-darwin.
# TODO: remove after 26.05 support ends.
if system == "x86_64-darwin" && (builtins.readFile ./.version) == "26.05" then
let
pinned = (builtins.fromJSON (builtins.readFile ./ci/pinned.json)).pins;
warn = builtins.warn or (import ./lib).warn;
inherit (pinned."nixpkgs-26.05-darwin")
url
hash
revision
branch
;
withWarning = warn (toString [
"The currently pinned Nixpkgs (${pinned.nixpkgs.revision}) does not support ${system},"
"using revision (${revision}) from ${branch}."
"You may experience some differences to CI."
]);
in
withWarning fetchTarball {
inherit url;
sha256 = hash;
}
else
null
),
}:
let
inherit (import ./ci { inherit nixpkgs system; }) pkgs fmt;
# For `nix-shell -A hello`
curPkgs = 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 = [
# Helper to review Nixpkgs PRs
# See CONTRIBUTING.md
pkgs.nixpkgs-reviewFull
# Command-line utility for working with GitHub
# Used by nixpkgs-review to fetch eval results
pkgs.gh
# treefmt wrapper
fmt.pkg
];
}
// {
formatter = fmt.pkg;
}
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