libutil: Fix copyRecursive and use for nix flake clone#14606
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The use of sourceToSink is an unnecessary serialization bottleneck. While we are at it, fix the copyRecursive implementation to actually copy the whole directory. It wasn't used for anything prior, but now it has a use and accompanying tests for flake clone.
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Motivation
The use of sourceToSink is an unnecessary serialization bottleneck. While we are at it, fix the copyRecursive implementation to actually copy the whole directory. It wasn't used for anything prior, but now it has a use and accompanying tests for flake clone.
Context
#14602 (comment)
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