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fix(flake): switch to useFetchCargoVendor for crates.io UA compatibility #22

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Merged
ericbmerritt merged 1 commit into from
May 28, 2026
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fix(flake): switch to useFetchCargoVendor for crates.io UA compatibility #22

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20 changes: 18 additions & 2 deletions flake.nix
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Original file line number Diff line number Diff line change
Expand Up @@ -39,7 +39,17 @@
version = "0.1.0";

src = self;
cargoLock.lockFile = self + "/Cargo.lock";

# crates.io began rejecting requests with no/generic User-Agent
# in late May 2026 (HTTP 403). nixpkgs has two crate-fetching
# paths; only `fetchCargoVendor` was patched upstream to send
# an identifying UA and use static.crates.io
# (NixOS/nixpkgs#512735). `cargoLock.lockFile` routes through
# the older `importCargoLock` inline `fetchCrate` which is
# still broken at HEAD. Use `cargoHash` + `useFetchCargoVendor`
# to take the fixed path.
useFetchCargoVendor = true;
cargoHash = "sha256-diO7j+Dtzh8PhKMxzTk7pQ+VM7rCeGk29ba1upPyRJg=";

doCheck = false;

Expand All @@ -57,7 +67,13 @@

packages = with pkgs; [
toolchain
fenix.packages.${system}.rust-analyzer
# Use nixpkgs's pre-built rust-analyzer rather than fenix's
# nightly. Fenix builds rust-analyzer from source, which
# routes through the broken `importCargoLock` crate fetcher
# and is currently blocked by crates.io's User-Agent policy
# (see the cargoHash comment above). nixpkgs ships a binary
# from cache.nixos.org — no crate fetching at build time.
rust-analyzer
jujutsu
just
alejandra
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