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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>

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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 [nixos]: https://nixos.org
# Usage ## Usage
## Getting Nix ### Getting Nix
In order to use System Manager, you will first need to install 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 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 '.' 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. Currently it is possible to configure files under `/etc/` and systemd services.
More features may follow later. 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: System Manager is currently only supported on NixOS and Ubuntu. However, it can be used on other distributions by enabling the following: