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feat: overlays

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docs/nixpkgs/multiple-nixpkgs.md
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# The Ingenious Uses of Multiple nixpkgs Instances # The Ingenious Uses of Multiple nixpkgs Instances
In the section [Downgrade or Upgrade Packages](../nixos-with-flakes/downgrade-or-upgrade-packages.md), we have seen how to instantiate multiple distinct nixpkgs instances using the method `import nixpkgs {...}`. There are numerous applications for this technique, some common ones include: In the section [Downgrade or Upgrade Packages](../nixos-with-flakes/downgrade-or-upgrade-packages.md), we have seen how to instantiate multiple distinct nixpkgs instances using the method `import nixpkgs {...}`, and use them at any submodules via `specialArgs`.
There are numerous applications for this technique, some common ones include:
1. Instantiate nixpkgs instances with different commit IDs to install various versions of software packages. This approach was used in the previous section [Downgrade or Upgrade Packages](/nixos-with-flakes/downgrade-or-upgrade-packages.md). 1. Instantiate nixpkgs instances with different commit IDs to install various versions of software packages. This approach was used in the previous section [Downgrade or Upgrade Packages](/nixos-with-flakes/downgrade-or-upgrade-packages.md).

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docs/zh/nixpkgs/multiple-nixpkgs.md
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# 多 nixpkgs 实例的妙用 # 多 nixpkgs 实例的妙用
我们在前面 [降级与升级软件包](../nixos-with-flakes/downgrade-or-upgrade-packages.md) 一节中见过，怎么通过 `import nixpkgs {...}` 这样的方法实例化多个不同的 nixpkgs 实例。 我们在前面 [降级与升级软件包](../nixos-with-flakes/downgrade-or-upgrade-packages.md) 一节中见过，怎么通过 `import nixpkgs {...}` 这样的方法实例化多个不同的 nixpkgs 实例，再通过 `specialArgs` 在所有子模块中使用这些 nixpkgs 实例。
这种方法有很多的用途，常见的有： 这种方法有很多的用途，常见的有：
1. 通过实例化 commit id 不同的 nixpkgs 实例，用于安装不同版本的软件包。前面的 [降级与升级软件包](../nixos-with-flakes/downgrade-or-upgrade-packages.md) 一节中就是这样使用的。 1. 通过实例化 commit id 不同的 nixpkgs 实例，用于安装不同版本的软件包。前面的 [降级与升级软件包](../nixos-with-flakes/downgrade-or-upgrade-packages.md) 一节中就是这样使用的。