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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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11
src/libexpr/primops.cc
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@ -4383,13 +4383,16 @@ void EvalState::createBaseEnv()
.impureOnly = true,
});
if (!evalSettings.pureEval) {
v.mkString(settings.thisSystem.get());
}
if (!evalSettings.pureEval)
v.mkString(evalSettings.getCurrentSystem());
addConstant("__currentSystem", v, {
.type = nString,
.doc = R"(
The value of the [`system` configuration option](@docroot@/command-ref/conf-file.md#conf-system).
The value of the
[`eval-system`](@docroot@/command-ref/conf-file.md#conf-eval-system)
or else
[`system`](@docroot@/command-ref/conf-file.md#conf-system)
configuration option.
It can be used to set the `system` attribute for [`builtins.derivation`](@docroot@/language/derivations.md) such that the resulting derivation can be built on the same system that evaluates the Nix expression: