devos/lib/utils.nix
David Arnold 7fb5967735
Don't evaluate overlays on master
master is only used in the context of `pkgs/override.nix`
and `unstableModulesPath`
and only within `./hosts`

Since overlays exists that are incompatible between nixos and master
at evaluation time (sic!), this together with #77 avoids evaluating
overlays against master all together.
2021-01-10 20:10:59 -05:00

97 lines
2.5 KiB
Nix

{ lib, ... }:
let
inherit (builtins) attrNames isAttrs readDir listToAttrs;
inherit (lib) filterAttrs hasSuffix mapAttrs' nameValuePair removeSuffix
recursiveUpdate genAttrs;
# mapFilterAttrs ::
# (name -> value -> bool )
# (name -> value -> { name = any; value = any; })
# attrs
mapFilterAttrs = seive: f: attrs: filterAttrs seive (mapAttrs' f attrs);
# Generate an attribute set by mapping a function over a list of values.
genAttrs' = values: f: listToAttrs (map f values);
pkgImport = { pkgs, system, overlays }:
import pkgs {
inherit system overlays;
config = { allowUnfree = true; };
};
# 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;
});
in
{
inherit mapFilterAttrs genAttrs' pkgImport pathsToImportedAttrs;
genPkgset = { master, nixos, overlays, system }:
{
osPkgs = pkgImport {
inherit system overlays;
pkgs = nixos;
};
unstablePkgs = pkgImport {
inherit system;
overlays = [];
pkgs = master;
};
};
overlayPaths =
let
overlayDir = ../overlays;
fullPath = name: overlayDir + "/${name}";
in
map fullPath (attrNames (readDir overlayDir));
recImport = { dir, _import ? base: import "${dir}/${base}.nix" }:
mapFilterAttrs
(_: v: v != null)
(n: v:
if n != "default.nix" && hasSuffix ".nix" n && v == "regular"
then
let name = removeSuffix ".nix" n; in nameValuePair (name) (_import name)
else
nameValuePair ("") (null))
(readDir dir);
modules =
let
# binary cache
cachix = import ../cachix.nix;
cachixAttrs = { inherit cachix; };
# modules
moduleList = import ../modules/list.nix;
modulesAttrs = pathsToImportedAttrs moduleList;
# profiles
profilesList = import ../profiles/list.nix;
profilesAttrs = { profiles = pathsToImportedAttrs profilesList; };
in
recursiveUpdate
(recursiveUpdate cachixAttrs modulesAttrs)
profilesAttrs;
genPackages = { self, pkgs }:
let
inherit (self) overlay overlays;
packages = overlay pkgs pkgs;
overlayPkgs =
genAttrs
(attrNames overlays)
(name: (overlays."${name}" pkgs pkgs)."${name}");
in
recursiveUpdate packages overlayPkgs;
}