os/flake.nix

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Nix
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{
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description = "A highly structured configuration database.";
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inputs.nixpkgs.url = "nixpkgs/release-20.03";
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inputs.unstable.url = "nixpkgs/master";
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inputs.home.url = "github:rycee/home-manager/bqv-flakes";
outputs = inputs@{ self, home, nixpkgs, unstable }:
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let
inherit (builtins) listToAttrs baseNameOf attrNames attrValues readDir;
inherit (nixpkgs.lib) removeSuffix;
system = "x86_64-linux";
# Generate an attribute set by mapping a function over a list of values.
genAttrs' = values: f: listToAttrs (map f values);
# Convert a list to file paths to attribute set
# that has the filenames stripped of nix extension as keys
# and imported content of the file as value.
pathsToImportedAttrs = paths:
genAttrs' paths (path: {
name = removeSuffix ".nix" (baseNameOf path);
value = import path;
});
pkgImport = pkgs:
import pkgs {
inherit system;
overlays = attrValues self.overlays;
config = { allowUnfree = true; };
};
pkgs = pkgImport nixpkgs;
unstablePkgs = pkgImport unstable;
in {
nixosConfigurations = let
configs =
import ./hosts (inputs // { inherit system pkgs unstablePkgs; });
in configs;
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overlay = import ./pkgs;
overlays = let
overlayDir = ./overlays;
fullPath = name: overlayDir + "/${name}";
overlayPaths = map fullPath (attrNames (readDir overlayDir));
in pathsToImportedAttrs overlayPaths;
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packages.x86_64-linux = self.overlay pkgs pkgs;
nixosModules = let
# modules
moduleList = import ./modules/list.nix;
modulesAttrs = pathsToImportedAttrs moduleList;
# profiles
profilesList = import ./profiles/list.nix;
profilesAttrs = { profiles = pathsToImportedAttrs profilesList; };
in modulesAttrs // profilesAttrs;
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};
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}