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This command fetches all inputs of a flake in parallel. Example runtime for $ chmod -R u+w /tmp/nix2; rm -rf /tmp/nix2; rm ~/.cache/nix/fetcher-cache-v3.sqlite*; rm -rf ~/.cache/nix/tarball-cache/ ~/.cache/nix/gitv3/; time nix flake prefetch-inputs --store /tmp/nix2 https://api.flakehub.com/f/pinned/informalsystems/cosmos.nix/0.3.0/018ce9ed-d0be-7ce5-81b6-a3c6e3ae1187/source.tar.gz with http-connections = 1: real 4m11.859s user 2m6.931s sys 0m25.619s and http-connections = 25 (the default): real 0m57.146s user 2m49.506s sys 0m36.008s
…h-865-add-nix-flake-prefetch-inputs-command-to-fetch-inputs-in
…mmands This allows us to start splitting up src/nix/flake.cc.
gustavderdrache
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Jun 30, 2025
cole-h
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Jun 30, 2025
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Works as advertised on the tin.
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Motivation
This command fetches all inputs of a flake in parallel. This can be a lot faster than the serialized on-demand fetching during regular flake evaluation. The downside is that it may fetch inputs that aren't normally used.
Example runtime for
with
http-connections = 1:and
http-connections = 25(the default):Context