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feat: show detailed error messages
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# Debugging Derivations and Nix Expressions
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## Show detailed error messages
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You can always try to add `--show-trace -L` to the `nixos-rebuild` command to get the detailed error message if you encounter any errors during the deployment. e.g.
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```bash
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sudo nixos-rebuild switch --flake .#myhost --show-trace -L
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```
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## Debugging with `nix repl`
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> NOTE: If you have disabled `NIX_PATH`, you won't be able to use syntax like `<nixpkgs>`. Instead, you should use `nix repl -f flake:nixpkgs` to load nixpkgs.
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@ -62,6 +62,8 @@ In this configuration, we declare our intention to enable the openssh service, a
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To deploy the modified configuration, run `sudo nixos-rebuild switch`. This command will apply the changes, generate a new system environment, and set it as the default. You can now log in to the system using SSH with the configured SSH keys.
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> You can always try to add `--show-trace -L` to the `nixos-rebuild` command to get the detailed error message if you encounter any errors during the deployment.
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Remember that any reproducible changes to the system can be made by modifying the `/etc/nixos/configuration.nix` file and deploying the changes with `sudo nixos-rebuild switch`.
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To find configuration options and documentation:
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@ -248,6 +248,8 @@ After that, you can start the Helix editor by running the `hx` command.
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> If your system's hostname is not `nixos-test`, you need to modify the name of `nixosConfigurations` in `flake.nix`, or use `--flake /etc/nixos#nixos-test` to specify the configuration name.
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> You can always try to add `--show-trace -L` to the `nixos-rebuild` command to get the detailed error message if you encounter any errors during the deployment.
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Furthermore, if you merely want to experiment with the latest version of Helix before deciding whether to install it system-wide, there's a simpler way – just a single command:
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> Similarly, if you wish to use the latest version, compiling from source is usually unavoidable and may take some time.
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# Other Useful Tips
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## Show detailed error messages
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You can always try to add `--show-trace -L` to the `nixos-rebuild` command to get the detailed error message if you encounter any errors during the deployment. e.g.
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```bash
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cd /etc/nixos
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sudo nixos-rebuild switch --flake .#myhost --show-trace -L
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```
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## Managing the Configuration with Git
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NixOS configuration, being a set of text files, is well-suited for version control with Git. This allows easy rollback to a previous version in case of issues.
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@ -87,7 +96,7 @@ The following configuration can be added to your NixOS configuration to help red
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automatic = true;
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dates = "weekly";
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options = "--delete-older-than 1w";
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};
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};
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# Optimize storage
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# You can also manually optimize the store via:
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# 调试 Derivation 跟 Nix 表达式
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## 查看详细错误信息
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如果你在部署配置时遇到了任何错误,都可以尝试在 `nixos-rebuild` 命令后面添加 `--show-trace -L` 参数来获取详细的错误信息。举例如下:
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```bash
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sudo nixos-rebuild switch --flake .#myhost --show-trace -L
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```
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## 通过 `nix repl` 查看源码、调试配置
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> 注:如果你禁用了 `NIX_PATH`,那么 `<nixpkgs>` 这样的语法将无法使用,你需要改用 `nix repl -f flake:nixpkgs` 来加载 nixpkgs。
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@ -67,6 +67,8 @@ NixOS 的系统配置路径为 `/etc/nixos/configuration.nix`,它包含系统
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现在运行 `sudo nixos-rebuild switch` 部署修改后的配置,之后就可以通过 ssh 密钥远程登录到我的这台主机了。
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> 如果你在部署配置时遇到了任何错误,都可以尝试在 `nixos-rebuild` 命令后面添加 `--show-trace -L` 参数来获取详细的错误信息。举例如下:
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这就是 NixOS 默认的声明式系统配置,要对系统做任何可复现的变更,都只需要修改 `/etc/nixos/configuration.nix` 文件,然后运行 `sudo nixos-rebuild switch` 部署变更即可。
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`/etc/nixos/configuration.nix` 的所有配置项,可以在这几个地方查到:
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@ -229,6 +229,8 @@ cat flake.nix
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> 如果你的系统 Hostname 不是 `nixos-test`,你需要在 `flake.nix` 中修改 `nixosConfigurations` 的名称,或者使用 `--flake /etc/nixos#nixos-test` 来指定配置名称。
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> 如果你在部署配置时遇到了任何错误,都可以尝试在 `nixos-rebuild` 命令后面添加 `--show-trace -L` 参数来获取详细的错误信息。举例如下:
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另外,如果你只是想尝试一下 Helix 的最新版本,再决定要不要真正地将它安装到系统里,有更简单的办法,一行命令就行:
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> 同样,想使用最新版本的话,源码编译基本是免不了的,这会需要一些时间。
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# NixOS 的其他实用技巧
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## 查看详细错误信息
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如果你在部署配置时遇到了任何错误,都可以尝试在 `nixos-rebuild` 命令后面添加 `--show-trace -L` 参数来获取详细的错误信息。举例如下:
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```bash
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cd /etc/nixos
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sudo nixos-rebuild switch --flake .#myhost --show-trace -L
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```
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## 使用 Git 管理 NixOS 配置 {#git-manage-nixos-config}
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> 这里不介绍 Git 本身的使用,如果不熟悉 Git 的话,可以先找资料学习一下 Git.
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