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Previously, Nix would not create a cache entry for substituted/cached inputs This led to severe slowdowns in some scenarios where a large input (like Nixpkgs) had already been unpacked to the store but didn't exist in a users cache, as described in https://github.com/NixOS/nix/issues/11228 Using the same method as https://github.com/NixOS/nix/pull/12911, we can create a cache entry for the fingerprint of substituted/cached inputs and avoid this problem entirely
464 B
464 B
| synopsis | prs | |
|---|---|---|
| Substituted flake inputs are no longer re-copied to the store |
|
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