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Separate fix-point from config importing hacks and other impurities

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This commit is contained in:
John Ericson 2016-04-26 10:53:31 -07:00
parent 18a91ddfb6
commit 4af2bf6663
3 changed files with 28 additions and 17 deletions
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2
default.nix
View file

@ -6,4 +6,4 @@ if ! builtins ? nixVersion || builtins.compareVersions requiredVersion builtins.
else
import ./pkgs/top-level
import ./pkgs/top-level/impure.nix

19
pkgs/top-level/default.nix
View file

@ -6,7 +6,7 @@
{ # The system (e.g., `i686-linux') for which to build the packages.
system ? builtins.currentSystem
system
, # The standard environment to use. Only used for bootstrapping. If
# null, the default standard environment is used.
@ -19,21 +19,8 @@
&& system != "x86_64-solaris"
&& system != "x86_64-kfreebsd-gnu")
, # Allow a configuration attribute set to be passed in as an
# argument. Otherwise, it's read from $NIXPKGS_CONFIG or
# ~/.nixpkgs/config.nix.
#
# [For NixOS (nixos-rebuild), use nixpkgs.config option to set.]
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 {}
, # Allow a configuration attribute set to be passed in as an argument.
config ? {}
, crossSystem ? null
, platform ? null

24
pkgs/top-level/impure.nix Normal file
View file

@ -0,0 +1,24 @@
/* 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; })