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doc: Document impure eval in README (#203)

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* doc: Document impure eval in README

* Use official wiki link

Co-authored-by: Jonas Chevalier <zimbatm@zimbatm.com>

---------

Co-authored-by: Jonas Chevalier <zimbatm@zimbatm.com>
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README.md
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@ -23,9 +23,9 @@ It builds on the many modules that already exist in [NixOS][nixos].
[nixos]: https://nixos.org
# Usage
## Usage
## Getting Nix
### Getting Nix
In order to use System Manager, you will first need to install Nix.
You can either use your distro's package manager, or use one of the different options
@ -112,12 +112,21 @@ Once the configuration is defined, you can activate it using the `system-manager
nix run 'github:numtide/system-manager' -- switch --flake '.'
```
# Currently supported features
### Reproducibility
By design flakes run in [pure evaluation mode](https://wiki.nixos.org/wiki/Flakes#Making_your_evaluations_pure).
In some cases you may not want this. To run an impure evaluation of the flake, add the following option to your command:
```sh
--nix-option pure-eval false
```
## Currently supported features
Currently it is possible to configure files under `/etc/` and systemd services.
More features may follow later.
## Supported Systems
### Supported Systems
System Manager is currently only supported on NixOS and Ubuntu. However, it can be used on other distributions by enabling the following: