README updates from amazing contributors (#854)

* Document nix version pinning more explicitly

https://github.com/DeterminateSystems/nix-installer/issues/387#issuecomment-1581743074

Co-authored-by: Ana Hobden <operator@hoverbear.org>

* Fixed a single typo in README.md

* Link to nixos.org to explain Nix

* README: Delete now-incorrect link listing installed `nix` versions

---------

Co-authored-by: Peter Kolloch <peter.kolloch@nexxiot.com>
Co-authored-by: Ana Hobden <operator@hoverbear.org>
Co-authored-by: Mikko Lukas Räsänen <1522239+mikkolukas@users.noreply.github.com>
Co-authored-by: Mauricio Scheffer <mauricioscheffer@gmail.com>
Co-authored-by: Ilya Grigoriev <ilyagr@users.noreply.github.com>
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@ -3,7 +3,7 @@
[![Crates.io](https://img.shields.io/crates/v/nix-installer)](https://crates.io/crates/nix-installer)
[![Docs.rs](https://img.shields.io/docsrs/nix-installer)](https://docs.rs/nix-installer/latest/nix_installer/)
A fast, friendly, and reliable tool to help you use Nix with Flakes everywhere.
A fast, friendly, and reliable tool to help you use [Nix] with Flakes everywhere.
```bash
@ -97,7 +97,7 @@ $ NIX_BUILD_GROUP_NAME=nixbuilder ./nix-installer install linux-multi --nix-buil
### Upgrading Nix
You can upgrade Nix (to the version specified [here](https://raw.githubusercontent.com/NixOS/nixpkgs/master/nixos/modules/installer/tools/nix-fallback-paths.nix)) by running:
You can upgrade Nix to the version described in [`DeterminateSystems/nix-upgrade`][nix-upgrade] by running:
```
sudo -i nix upgrade-nix
@ -254,7 +254,7 @@ wsl nix run --impure github:guibou/nixGL nix run nixpkgs#obs-studio
```
If enabling system is not an option, pass `--init none` at the end of the command:
If enabling systemd is not an option, pass `--init none` at the end of the command:
> **Warning**
> When `--init none` is used, _only_ `root` or users who can elevate to `root` privileges can run Nix:
@ -422,6 +422,13 @@ curl -sSf -L https://github.com/DeterminateSystems/nix-installer/releases/downlo
./nix-installer install
```
Each installer version has an [associated supported nix version](src/settings.rs) -- if you pin the installer version, you'll also indirectly pin to the associated nix version.
You can also override the `nix` version via `--nix-package-url` or `NIX_INSTALLER_NIX_PACKAGE_URL=` but doing so is not recommended since we haven't tested that combination.
Here are some example `nix` package URLs including nix version, OS and architecture:
* https://releases.nixos.org/nix/nix-2.18.1/nix-2.18.1-x86_64-linux.tar.xz
* https://releases.nixos.org/nix/nix-2.18.1/nix-2.18.1-aarch64-darwin.tar.xz
## Installation Differences
@ -491,3 +498,5 @@ You can read the full privacy policy for [Determinate Systems][detsys], the crea
[systemd]: https://systemd.io
[wslg]: https://github.com/microsoft/wslg
[nixgl]: https://github.com/guibou/nixGL
[Nix]: https://nixos.org
[nix-upgrade]: https://github.com/DeterminateSystems/nix-upgrade/blob/main/versions.nix