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nixpkgs/pkgs/top-level/impure.nix

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Nix

/* Impure default args for `pkgs/top-level/default.nix`. See that file
for the meaning of each argument. */
{ # 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/.nixpkgs/config.nix.
config ? let
inherit (builtins) getEnv pathExists;
configFile = getEnv "NIXPKGS_CONFIG";
homeDir = getEnv "HOME";
configFile2 = homeDir + "/.nixpkgs/config.nix";
in
if configFile != "" && pathExists configFile then import configFile
else if homeDir != "" && pathExists configFile2 then import configFile2
else {}
, ...
} @ args:
import ./. (args // { inherit system config; })