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Merge pull request #14041 from getchoo-contrib/getchoo/cache-substituted-inputs

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libfetchers: avoid re-copying substituted inputs
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Jörg Thalheim 2025-09-25 13:27:02 +02:00 • committed by GitHub
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doc/manual/rl-next/cached-substituted-inputs.md Normal file
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---
synopsis: "Substituted flake inputs are no longer re-copied to the store"
prs: [14041]
---
Since 2.25, Nix would fail to store a cache entry for substituted flake inputs,
which in turn would cause them to be re-copied to the store on initial
evaluation. Caching these inputs results in a near doubling of a performance in
some cases — especially on I/O-bound machines and when using commands that
fetch many inputs, like `nix flake archive/prefetch-inputs`