mirror of
https://github.com/ryan4yin/nixos-and-flakes-book
synced 2024-12-28 21:33:05 +00:00
68 lines
2.9 KiB
Markdown
68 lines
2.9 KiB
Markdown
|
||
|
||
## Flake 的 outputs {#flake-outputs}
|
||
|
||
`flake.nix` 中的 `outputs` 是一个 attribute set,是整个 Flake 的构建结果,每个 Flake 都可以有许多不同的 outputs。
|
||
|
||
一些特定名称的 outputs 有特殊用途,会被某些 Nix 命令识别处理,比如:
|
||
|
||
- Nix packages: 名称为 `apps.<system>.<name>`, `packages.<system>.<name>` 或 `legacyPackages.<system>.<name>` 的 outputs,都是 Nix 包,通常都是一个个应用程序。
|
||
- 可以通过 `nix build .#name` 来构建某个 nix 包
|
||
- Nix Helper Functions: 名称为 `lib` 的 outputs 是 Flake 函数库,可以被其他 Flake 作为 inputs 导入使用。
|
||
- Nix development environments: 名称为 `devShells` 的 outputs 是 Nix 开发环境
|
||
- 可以通过 `nix develop` 命令来使用该 Output 创建开发环境
|
||
- NixOS configurations: 名称为 `nixosConfigurations.<hostname>` 的 outputs,是 NixOS 的系统配置。
|
||
- `nixos-rebuild switch .#<hostname>` 可以使用该 Output 来部署 NixOS 系统
|
||
- Nix templates: 名称为 `templates` 的 outputs 是 flake 模板
|
||
- 可以通过执行命令 `nix flake init --template <reference>` 使用模板初始化一个 Flake 包
|
||
- 其他用户自定义的 outputs,可能被其他 Nix 相关的工具使用
|
||
|
||
NixOS Wiki 中给出的使用案例:
|
||
|
||
```nix
|
||
{ self, ... }@inputs:
|
||
{
|
||
# Executed by `nix flake check`
|
||
checks."<system>"."<name>" = derivation;
|
||
# Executed by `nix build .#<name>`
|
||
packages."<system>"."<name>" = derivation;
|
||
# Executed by `nix build .`
|
||
packages."<system>".default = derivation;
|
||
# Executed by `nix run .#<name>`
|
||
apps."<system>"."<name>" = {
|
||
type = "app";
|
||
program = "<store-path>";
|
||
};
|
||
# Executed by `nix run . -- <args?>`
|
||
apps."<system>".default = { type = "app"; program = "..."; };
|
||
|
||
# Formatter (alejandra, nixfmt or nixpkgs-fmt)
|
||
formatter."<system>" = derivation;
|
||
# Used for nixpkgs packages, also accessible via `nix build .#<name>`
|
||
legacyPackages."<system>"."<name>" = derivation;
|
||
# Overlay, consumed by other flakes
|
||
overlays."<name>" = final: prev: { };
|
||
# Default overlay
|
||
overlays.default = {};
|
||
# Nixos module, consumed by other flakes
|
||
nixosModules."<name>" = { config }: { options = {}; config = {}; };
|
||
# Default module
|
||
nixosModules.default = {};
|
||
# Used with `nixos-rebuild --flake .#<hostname>`
|
||
# nixosConfigurations."<hostname>".config.system.build.toplevel must be a derivation
|
||
nixosConfigurations."<hostname>" = {};
|
||
# Used by `nix develop .#<name>`
|
||
devShells."<system>"."<name>" = derivation;
|
||
# Used by `nix develop`
|
||
devShells."<system>".default = derivation;
|
||
# Hydra build jobs
|
||
hydraJobs."<attr>"."<system>" = derivation;
|
||
# Used by `nix flake init -t <flake>#<name>`
|
||
templates."<name>" = {
|
||
path = "<store-path>";
|
||
description = "template description goes here?";
|
||
};
|
||
# Used by `nix flake init -t <flake>`
|
||
templates.default = { path = "<store-path>"; description = ""; };
|
||
}
|
||
```
|