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vm change to reproducible command (#804)

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* add paragraph on a reproducible nixos-generate-config

Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
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source/tutorials/nixos/nixos-configuration-on-vm.md
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@ -20,14 +20,37 @@ Virtual machines are a practical tool for debugging NixOS configurations.
- A working [Nix installation](https://nixos.org/manual/nix/stable/installation/installation.html) on Linux, or [NixOS](https://nixos.org/manual/nixos/stable/index.html#sec-installation), with a graphical environment
- Basic knowledge of the [Nix language](reading-nix-language)
## Starting from the default NixOS configuration
## Starting from a default NixOS configuration
In this tutorial you will use the default configuration that is shipped with NixOS.[^nixosconf]
[^nixosconf]: This [configuration template](https://github.com/NixOS/nixpkgs/blob/4e0525a8cdb370d31c1e1ba2641ad2a91fded57d/nixos/modules/installer/tools/tools.nix#L122-L226) is used.
In this tutorial you will use a default configuration that is shipped with NixOS.
:::{admonition} NixOS
On NixOS, use the `nixos-generate-config` command to create a configuration file that contains some useful defaults and configuration suggestions.
Beware that the result of this command depends on your current NixOS configuration.
The output of 'nixos-generate-config' can be made reproducible in a `nix-shell` environment.
Here we provide a configuration that corresponds to the NixOS GNOME graphical ISO image:
```bash
nix-shell -I nixpkgs=channel:nixos-22.05 -p "$(cat <<EOF
let
pkgs = import <nixpkgs> { config = {}; overlays = []; };
nixos = pkgs.nixos {
services.xserver.enable = true;
services.xserver.desktopManager.gnome.enable = true;
};
in nixos.config.system.build.nixos-generate-config
EOF
)"
```
Or as a one-liner:
```shell-session
nix-shell -I nixpkgs=channel:nixos-22.05 -p "let pkgs = import <nixpkgs> { config = {}; overlays = []; }; nixos = pkgs.nixos { services.xserver.enable = true; services.xserver.desktopManager.gnome.enable = true; }; in nixos.config.system.build.nixos-generate-config"
```
By default, the configuration file is located at `/etc/nixos/configuration.nix`.
To avoid overwriting this file you have to specify the output directory.
Create a NixOS configuration in your working directory: