如何让 NixOS 显示一次更新的具体内容
当 NixOS 配置好了 flake、home-manager 等等，后续的更新我们只需要运行：
1❯ nix flake update
2
3❯ sudo nixos-rebuild switch
4building the system configuration...
5activating the configuration...
6setting up /etc...
7reloading user units for davinci42...
8restarting sysinit-reactivation.target
9the following new units were started: NetworkManager-dispatcher.service
10Done. The new configuration is /nix/store/mp17nhbadmffs9ah961ldj0y1l38a73m-nixos-system-azure-25.05.20250424.f771eb4
除了 kernel 的更新需要重启，某些环境变量需要新开 session 之外，其它 pkg 和对应的 systemd-service 应该都是最新的状态了。
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