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* Added an option "nixpkgs.system" to specify the system type for

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which NixOS should be built.  This is useful in NixOS network
  specifications, because it allows machines in the network to have
  different types, e.g.,

    {
      machine1 =
        { config, pkgs, ... }:
        { nixpkgs.system = "i686-linux";
          ... other config ...
        };

      machine2 =
        { config, pkgs, ... }:
        { nixpkgs.system = "x86_64-linux";
          ... other config ...
        };
    }

  It can also be useful in distributed NixOS tests.

svn path=/nixos/trunk/; revision=24823
This commit is contained in:
Eelco Dolstra 2010-11-23 16:07:00 +00:00
parent fcf53be5bd
commit c958902d44
2 changed files with 16 additions and 3 deletions
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8
lib/eval-config.nix
View file

@ -11,7 +11,7 @@
, modules
}:
let extraArgs_ = extraArgs; pkgs_ = pkgs; in
let extraArgs_ = extraArgs; pkgs_ = pkgs; system_ = system; in
rec {
@ -39,7 +39,8 @@ rec {
# Import Nixpkgs, allowing the NixOS option nixpkgs.config to
# specify the Nixpkgs configuration (e.g., to set package options
# such as firefox.enableGeckoMediaPlayer, or to apply global
# overrides such as changing GCC throughout the system). This is
# overrides such as changing GCC throughout the system), and the
# option nixpkgs.system to override the platform type. This is
# tricky, because we have to prevent an infinite recursion: "pkgs"
# is passed as an argument to NixOS modules, but the value of "pkgs"
# depends on config.nixpkgs.config, which we get from the modules.
@ -50,12 +51,13 @@ rec {
then pkgs_
else import nixpkgs (
let
system = if nixpkgsOptions.system != "" then nixpkgsOptions.system else system_;
nixpkgsOptions = (import ./eval-config.nix {
inherit system nixpkgs services extraArgs modules;
# For efficiency, leave out most NixOS modules; they don't
# define nixpkgs.config, so it's pointless to evaluate them.
baseModules = [ ../modules/misc/nixpkgs.nix ];
pkgs = import nixpkgs { inherit system; config = {}; };
pkgs = import nixpkgs { system = system_; config = {}; };
}).optionDefinitions.nixpkgs;
in
{

11
modules/misc/nixpkgs.nix
View file

@ -13,6 +13,17 @@
'';
};
nixpkgs.system = pkgs.lib.mkOption {
default = "";
description = ''
Specifies the Nix platform type for which NixOS should be built.
If unset, it defaults to the platform type of your host system
(<literal>${builtins.currentSystem}</literal>).
Specifying this option is useful when doing distributed
multi-platform deployment, or when building virtual machines.
'';
};
nixpkgs.platform = pkgs.lib.mkOption {
default = pkgs.platforms.pc;
description = ''