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nixos/nixpkgs.nix: Recommend hostPlatform instead of system

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The ${opt.*} syntax will print the full path when NixOS is used
as a submodule.

nixpkgs.system / nixpkgs.localSystem must not be read by any
other module because its meaning is ambiguous in cross vs
non-cross contexts. hostPlatform is generally what you need.
*Where* you build something generally doesn't matter in a
system _configuration_ context like NixOS.
This commit is contained in:
Robert Hensing 2022-06-25 11:02:54 +02:00
parent 82378f9c0c
commit acd969a4dd
1 changed files with 34 additions and 0 deletions
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34
nixos/modules/misc/nixpkgs.nix
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@ -244,6 +244,14 @@ in
defaultText = literalExpression
''(import "''${nixos}/../lib").lib.systems.examples.aarch64-multiplatform'';
description = ''
Systems with a recently generated <literal>hardware-configuration.nix</literal>
do not need to specify this option, unless cross-compiling, in which case
you should set <emphasis>only</emphasis> <option>nixpkgs.buildPlatform</option>.
If this is somehow not feasible, you may fall back to removing the
<option>nixpkgs.hostPlatform</option> line from the generated config and
use the old options.
Specifies the platform on which NixOS should be built. When
<code>nixpkgs.crossSystem</code> is unset, it also specifies
the platform <emphasis>for</emphasis> which NixOS should be
@ -265,6 +273,10 @@ in
default = null;
example = { system = "aarch64-linux"; config = "aarch64-unknown-linux-gnu"; };
description = ''
Systems with a recently generated <literal>hardware-configuration.nix</literal>
may instead specify <emphasis>only</emphasis> <option>nixpkgs.buildPlatform</option>,
or fall back to removing the <option>nixpkgs.hostPlatform</option> line from the generated config.
Specifies the platform for which NixOS should be
built. Specify this only if it is different from
<code>nixpkgs.localSystem</code>, the platform
@ -280,7 +292,29 @@ in
system = mkOption {
type = types.str;
example = "i686-linux";
default =
if opt.hostPlatform.isDefined
then
throw ''
Neither ${opt.system} nor any other option in nixpkgs.* is meant
to be read by modules and configurations.
Use pkgs.stdenv.hostPlatform instead.
''
else
throw ''
Neither ${opt.hostPlatform} nor or the legacy option ${opt.system} has been set.
You can set ${opt.hostPlatform} in hardware-configuration.nix by re-running
a recent version of nixos-generate-config.
The option ${opt.system} is still fully supported for NixOS 22.05 interoperability,
but will be deprecated in the future, so we recommend to set ${opt.hostPlatform}.
'';
defaultText = lib.literalMD ''
Traditionally `builtins.currentSystem`, but unset when invoking NixOS through `lib.nixosSystem`.
'';
description = ''
This option does not need to be specified for NixOS configurations
with a recently generated <literal>hardware-configuration.nix</literal>.
Specifies the Nix platform type on which NixOS should be built.
It is better to specify <code>nixpkgs.localSystem</code> instead.
<programlisting>