os/flake.nix

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Nix
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{
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description = "A highly structured configuration database.";
inputs =
{
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# Once desired, bump master's locked revision:
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# nix flake update --update-input master
master.url = "nixpkgs/master";
nixos.url = "nixpkgs/release-20.09";
home.url = "github:nix-community/home-manager/release-20.09";
flake-utils.url = "github:numtide/flake-utils/flatten-tree-system";
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devshell.url = "github:numtide/devshell";
nixos-hardware.url = "github:nixos/nixos-hardware";
};
outputs = inputs@{ self, home, nixos, master, flake-utils, nur, devshell, nixos-hardware }:
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let
inherit (builtins) attrNames attrValues elem pathExists;
inherit (flake-utils.lib) eachDefaultSystem mkApp flattenTreeSystem;
inherit (nixos) lib;
inherit (lib) recursiveUpdate filterAttrs mapAttrs;
inherit (utils) pathsToImportedAttrs genPkgset overlayPaths modules
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genPackages pkgImport;
utils = import ./lib/utils.nix { inherit lib; };
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externOverlays = [ nur.overlay devshell.overlay ];
externModules = [ home.nixosModules.home-manager ];
pkgs' = unstable:
let
override = import ./pkgs/override.nix;
overlays = (attrValues self.overlays)
++ externOverlays
++ [ self.overlay (override unstable) ];
in
pkgImport nixos overlays;
unstable' = pkgImport master [ ];
osSystem = "x86_64-linux";
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outputs =
let
system = osSystem;
unstablePkgs = unstable' system;
osPkgs = pkgs' unstablePkgs system;
in
{
nixosConfigurations =
import ./hosts (recursiveUpdate inputs {
inherit lib osPkgs unstablePkgs utils externModules system;
});
overlay = import ./pkgs;
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overlays = pathsToImportedAttrs overlayPaths;
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nixosModules = modules;
templates.flk.path = ./.;
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templates.flk.description = "flk template";
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defaultTemplate = self.templates.flk;
};
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in
recursiveUpdate
(eachDefaultSystem
(system:
let
unstablePkgs = unstable' system;
pkgs = pkgs' unstablePkgs system;
packages = flattenTreeSystem system
(genPackages {
inherit self pkgs;
});
in
{
inherit packages;
devShell = import ./shell.nix {
inherit pkgs;
};
}
)
)
outputs;
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}