add pixi until 0.15.2 lands in nixpkgs-unstable

modules/languages/python.nix

@@ -6,6 +6,7 @@
 }: let
   inherit (lib) mkIfIn;
   cfg = config.oizys.languages;
+  pixi = pkgs.callPackage ../../pkgs/pixi.nix {};
 in {
   config = mkIfIn "python" cfg {
     environment.systemPackages = let

pkgs/pixi.nix

@@ -0,0 +1,76 @@
+{ lib
+, stdenv
+, rustPlatform
+, fetchFromGitHub
+, pkg-config
+, openssl
+, installShellFiles
+, darwin
+, testers
+, pixi
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "pixi";
+  version = "0.15.2";
+
+  src = fetchFromGitHub {
+    owner = "prefix-dev";
+    repo = "pixi";
+    rev = "v${version}";
+    hash = "sha256-bh8Uu6Q2AND50Qzivc6k1Z8JWudkHC2i4YW1Hxa69SM=";
+  };
+
+  cargoHash = "sha256-yMIcPwnuN7F2ZrOtJw8T+nxeSzLsYn+iC34bYeWpi/w=";
+
+  nativeBuildInputs = [
+    pkg-config
+    installShellFiles
+  ];
+
+  buildInputs = [
+    openssl
+  ]
+  ++ lib.optionals stdenv.isDarwin (
+    with darwin.apple_sdk_11_0.frameworks; [ CoreFoundation IOKit SystemConfiguration Security ]
+  );
+
+  # There are some CI failures with Rattler. Tests on Aarch64 has been skipped.
+  # See https://github.com/prefix-dev/pixi/pull/241.
+  doCheck = !stdenv.isAarch64;
+
+  preCheck = ''
+    export HOME="$(mktemp -d)"
+  '';
+
+  checkFlags = [
+    # Skip tests requiring network
+    "--skip=add_channel"
+    "--skip=add_functionality"
+    "--skip=add_functionality_os"
+    "--skip=add_functionality_union"
+    "--skip=add_pypi_functionality"
+    "--skip=test_alias"
+    "--skip=test_cwd"
+    "--skip=test_incremental_lock_file"
+  ];
+
+  postInstall = ''
+    installShellCompletion --cmd pix \
+      --bash <($out/bin/pixi completion --shell bash) \
+      --fish <($out/bin/pixi completion --shell fish) \
+      --zsh <($out/bin/pixi completion --shell zsh)
+  '';
+
+  passthru.tests.version = testers.testVersion {
+    package = pixi;
+  };
+
+  meta = with lib; {
+    description = "Package management made easy";
+    homepage = "https://pixi.sh/";
+    license = licenses.bsd3;
+    maintainers = with lib.maintainers; [ aaronjheng edmundmiller ];
+    mainProgram = "pixi";
+  };
+}