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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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9
src/libutil/mounted-source-accessor.cc
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@ -81,6 +81,15 @@ struct MountedSourceAccessorImpl : MountedSourceAccessor
// FIXME: thread-safety
mounts.insert_or_assign(std::move(mountPoint), accessor);
}
std::shared_ptr<SourceAccessor> getMount(CanonPath mountPoint) override
{
auto i = mounts.find(mountPoint);
if (i != mounts.end())
return i->second;
else
return nullptr;
}
};
ref<MountedSourceAccessor> makeMountedSourceAccessor(std::map<CanonPath, ref<SourceAccessor>> mounts)