nix docs

website/content/volunteer/guide/project-setup/nix.md

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+title = "Nix setup"
+
+[extra]
+order = 2 # Page number after chapter intro
++++
+## Using Graphite on NixOS/Nix
+
+Run Graphite without installing:
+
+```sh
+nix run github:GraphiteEditor/Graphite
+```
+
+### Binary Cache
+
+A [Binary Cache](https://graphite.cachix.org/) is available to avoid building from source.
+
+You can use it directly on the command line:
+
+```sh
+nix run github:GraphiteEditor/Graphite --extra-substituters "https://graphite.cachix.org" --extra-trusted-public-keys "graphite.cachix.org-1:B7Il1yMpkquN/dXM+5GRmz+4Xmu2aaCS1GcWNfFhsOo="
+```
+
+### Using the Flake from the official repository
+
+To add Graphite to a NixOS configuration, include the flake as an input:
+
+```nix
+{
+  inputs = {
+    nixpkgs.url = "...";
+    graphite.url = "github:GraphiteEditor/Graphite";
+  };
+
+  outputs = { nixpkgs, graphite, ... }: {
+    nixosConfigurations.your-host = nixpkgs.lib.nixosSystem {
+      modules = [
+        {
+          environment.systemPackages = [
+            graphite.packages.x86_64-linux.default
+          ];
+
+          nix.settings = {
+            substituters = [ "https://graphite.cachix.org" ];
+            trusted-public-keys = [
+              "graphite.cachix.org-1:B7Il1yMpkquN/dXM+5GRmz+4Xmu2aaCS1GcWNfFhsOo="
+            ];
+          };
+        }
+      ];
+    };
+  };
+}
+```
+
+### Nixpkgs
+
+Graphite is also available in [nixpkgs](https://github.com/NixOS/nixpkgs) as [`graphite`](https://search.nixos.org/packages?channel=unstable&query=graphite&show=graphite).
+
+All Graphite code is licensed under the [Apache License 2.0](https://graphite.art/license#source-code), but the derivation also bundles the official branding assets which are licensed under the separate [Graphite Branding License](https://graphite.art/license#branding). Graphite is therefore not considered free by nixpkgs and not cached in the main NixOS cache.
+
+Pre-built binaries are instead available through the [nix-community cache](https://nix-community.org/cache/):
+
+```nix
+nix.settings = {
+  substituters = [ "https://nix-community.cachix.org" ];
+  trusted-public-keys = [
+    "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+  ];
+};
+```