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Lazily copy trees to the store

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We now mount lazy accessors on top of /nix/store without materializing
them, and only materialize them to the real store if needed (e.g. in
the `derivation` primop).
This commit is contained in:
Eelco Dolstra 2025-04-08 23:32:52 +02:00
parent c891554999
commit febd28db87
14 changed files with 122 additions and 50 deletions
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8
src/libexpr/eval.cc
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@ -267,11 +267,9 @@ EvalState::EvalState(
auto accessor = getFSSourceAccessor();
auto realStoreDir = dirOf(store->toRealPath(StorePath::dummy));
if (settings.pureEval || store->storeDir != realStoreDir) {
accessor = settings.pureEval
? storeFS.cast<SourceAccessor>()
: makeUnionSourceAccessor({accessor, storeFS});
}
accessor = settings.pureEval
? storeFS.cast<SourceAccessor>()
: makeUnionSourceAccessor({accessor, storeFS});
/* Apply access control if needed. */
if (settings.restrictEval || settings.pureEval)