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Add eval-system option

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`eval-system` option overrides just the value of `builtins.currentSystem`.
This is more useful than overriding `system` since you can build these
derivations on remote builders which can work on the given system.

Co-authored-by: John Ericson <John.Ericson@Obsidian.Systems>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
This commit is contained in:
Matthew Bauer 2020-09-29 15:33:47 -04:00 • committed by John Ericson
parent fc0accf3dc
commit bcbdb09ccf
5 changed files with 40 additions and 6 deletions
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20
src/libexpr/eval-settings.hh
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@ -27,6 +27,26 @@ struct EvalSettings : Config
[`builtins.nixPath`](@docroot@/language/builtin-constants.md#builtins-nixPath).
)"};
Setting<std::string> currentSystem{
this, "", "eval-system",
R"(
This option defines
[`builtins.currentSystem`](@docroot@/language/builtin-constants.md#builtins-currentSystem)
in the Nix language if it is set as a non-empty string.
Otherwise, if it is defined as the empty string (the default), the value of the
[`system` ](#conf-system)
configuration setting is used instead.
Unlike `system`, this setting does not change what kind of derivations can be built locally.
This is useful for evaluating Nix code on one system to produce derivations to be built on another type of system.
)"};
/**
* Implements the `eval-system` vs `system` defaulting logic
* described for `eval-system`.
*/
const std::string & getCurrentSystem();
Setting<bool> restrictEval{
this, false, "restrict-eval",
R"(