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Merge pull request #4093 from matthewbauer/eval-system

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Add eval-system option

(cherry picked from commit 071dbbee33af9f27338c3e53e4ea067dbfa14010)
Change-Id: Ia81358c8cfb60241da07a4d0e84b9ee62a18a53f
This commit is contained in:
eldritch horrors
2024-03-04 07:21:01 +01:00
parent 64a269ef73
commit 7614aa9797
8 changed files with 89 additions and 6 deletions
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src/libexpr/primops.cc
+7 -4
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@@ -4288,13 +4288,16 @@ 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-pure-eval).
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: