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{
  system ? builtins.currentSystem,
  pkgs ?
    import (fetchTarball {
      url = "https://github.com/NixOS/nixpkgs/tarball/cfc3698c31b1fb9cdcf10f36c9643460264d0ca8";
      sha256 = "1xn1k48w678hjkrx434n995i68jwkxrwpncyjzrmfz0i9p2y7igh";
    }) {
      config = {};
      overlays = [];
      inherit system;

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Setting up a local experiment

To experiment with source file selection, we'll set up a local project.

To start out, create a new directory, enter it, and set up niv to manage the Nixpkgs dependency:

$ mkdir select
$ cd select
$ nix-shell -p niv --run "niv init --nixpkgs nixos/nixpkgs --nixpkgs-branch nixos-unstable"

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#!/usr/bin/env bash

# This is emulating flake's pure evaluation mode
purePathExpr() {
  local arg=$1
  if [[ -f "$arg" ]]; then
    root=$(dirname "$arg")
  else
    root=$arg
  fi

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(import <nixpkgs/lib>).evalModules {
  modules = [
    ./generic.nix
    ./specific1.nix
    ./specific2.nix
  ];
}

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{ pkgs, lib, config, ... }: with lib.types;

let

  postgresqlInstanceType = submodule {
    options.connectionString = lib.mkOption {
      type = str;
    };
  };

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(import <nixpkgs/lib>).evalModules {
  modules = [
    ({ lib, config, ... }: {


      options.foo = lib.mkOption {
        type = lib.types.int;
      };
      options.bar = lib.mkOption {
        default = { };

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let with

Originally described in NixOS/rfcs#110 (comment)

{ pkgs, hello }:
let
  with pkgs;
  myHello = hello.override { ... };
in [

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• f3031298b22e @marsam - chipsec: disable on non-Linux
• 2cdc05763f4f @marsam - chipsec: disable on non-Linux
• 7bfde4b33400 @zimbatm - Revert "st: enable build on darwin (#98668)"
• 020ff6989a9e @NeQuissimus - 1password: 1.1.1 -> 1.7.0
• 5ab14bf6ad62 @NeQuissimus - vivaldi: 3.3.2022.39-1 -> 3.3.2022.47-1
• 5d4cc0e25c15 @rickynils

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- [f3031298b22e](https://github.com/NixOS/nixpkgs/commit/f3031298b22ed05a0b46728fa4f053a990a562f1) [@marsam](https://github.com/marsam) - chipsec: disable on non-Linux
- [2cdc05763f4f](https://github.com/NixOS/nixpkgs/commit/2cdc05763f4f857d04ead6c53fe8be23ec441903) [@marsam](https://github.com/marsam) - chipsec: disable on non-Linux
- [7bfde4b33400](https://github.com/NixOS/nixpkgs/commit/7bfde4b33400c1a9b5655a5b13960011a0d6740c) [@zimbatm](https://github.com/zimbatm) - Revert "st: enable build on darwin (#98668)"
- [020ff6989a9e](https://github.com/NixOS/nixpkgs/commit/020ff6989a9ee98f779dc5f9f74b96c4a8090f72) [@NeQuissimus](https://github.com/NeQuissimus) - 1password: 1.1.1 -> 1.7.0
- [5ab14bf6ad62](https://github.com/NixOS/nixpkgs/commit/5ab14bf6ad62873e39a3593d158b599b86267274) [@NeQuissimus](https://github.com/NeQuissimus) - vivaldi: 3.3.2022.39-1 -> 3.3.2022.47-1
- [5d4cc0e25c15](https://github.com/NixOS/nixpkgs/commit/5d4cc0e25c1589f4248c4534260c86647bc4ae73) [@rickynils](https://github.com/rickynils)

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❯ cd $(mktemp -d)
❯ git init
Initialized empty Git repository in /tmp/tmp.ovd5lFO665/.git/
❯ echo 1 > foo
❯ git add foo
❯ git commit -m 'Version 1'
[main (root-commit) af124d9] Version 1
 1 file changed, 1 insertion(+)
 create mode 100644 foo
❯ git switch -c release