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/* Impure default args for `pkgs/top-level/default.nix`. See that file
for the meaning of each argument. */
with builtins;
let
homeDir = builtins.getEnv "HOME";
# Return ‘x’ if it evaluates, or ‘def’ if it throws an exception.
try = x: def: let res = tryEval x; in if res.success then res.value else def;
in
{ # Fallback: Assume we are building packages for the current (host, in GNU
# Autotools parlance) system.
system ? builtins.currentSystem
, # Fallback: The contents of the configuration file found at $NIXPKGS_CONFIG or
# $HOME/.config/nixpkgs/config.nix.
config ? let
configFile = getEnv "NIXPKGS_CONFIG";
configFile2 = homeDir + "/.config/nixpkgs/config.nix";
configFile3 = homeDir + "/.nixpkgs/config.nix"; # obsolete
in
if configFile != "" && pathExists configFile then import configFile
else if homeDir != "" && pathExists configFile2 then import configFile2
else if homeDir != "" && pathExists configFile3 then import configFile3
else {}
, # Overlays are used to extend Nixpkgs collection with additional
# collections of packages. These collection of packages are part of the
# fix-point made by Nixpkgs.
overlays ? let
dirPath = try (if pathExists <nixpkgs-overlays> then <nixpkgs-overlays> else "") "";
dirHome = homeDir + "/.config/nixpkgs/overlays";
dirCheck = dir: dir != "" && pathExists (dir + "/.");
overlays = dir:
let content = readDir dir; in
map (n: import (dir + ("/" + n)))
(builtins.filter (n: builtins.match ".*\.nix" n != null)
(attrNames content));
in
if dirPath != "" then
overlays dirPath
else if dirCheck dirHome then overlays dirHome
else []
, ...
} @ args:
import ./. (args // { inherit system config overlays; })
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