build(nix): fix downloads from crates.io in nix builds#8282
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crates.io recently started rejecting requests to https://crates.io/api/v1/crates made by Nix: rust-lang/crates.io#13482 This resulted in failing to download any dependencies from crates.io with 403 error during Rust package builds. The problem was solved in nixpkgs by switching to CDN URL https://static.crates.io/crates in NixOS/nixpkgs#524985 As of writing this on 2026-05-29 the fix is on "master" branch of nixpkgs, but not on "nixos-unstable" or "nixpkgs-unstable" branches yet according to https://nixpk.gs/pr-tracker.html?pr=524985 so I have switched nixpkgs to "master" branch to get the problem fixed. naersk needs a similar fix. I opened a PR for it nix-community/naersk#391 but because the fix is not merged yet, switched to my PR branch in flake.nix. Updating nixpkgs required some minor changes, e.g. sphinx_rtd_theme has been renamed to sphinx-rtd-theme, pthreads in Windows builds had to be moved to buildInputs to fix "Refusing to evaluate package 'mingw_w64-pthreads-13.0.0' in /nix/store/f78lkqnk63pd0kf52zf2wcx35p1nnalr-source/pkgs/os-specific/windows/mingw-w64/headers.nix:35 because it is not available on the requested hostPlatform"
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crates.io recently started rejecting calls to https://crates.io/api/v1/crates
made by Nix, apparently based on the user agent.
This resulted in failing to download any dependencies
from crates.io with 403 error during Rust package builds.
The problem was solved in nixpkgs by switching
to CDN URL https://static.crates.io/crates
in NixOS/nixpkgs#524985
As of writing this on 2026-05-29
the fix is on "master" branch of nixpkgs,
but not on "nixos-unstable" or "nixpkgs-unstable"
branches yet according to https://nixpk.gs/pr-tracker.html?pr=524985
so I have switched nixpkgs to "master" branch to get the problem fixed.
naersk needs a similar fix. I opened a PR for it
nix-community/naersk#391
but because the fix is not merged yet,
switched to my PR branch in flake.nix.
Updating nixpkgs required some minor changes,
e.g. sphinx_rtd_theme has been renamed to sphinx-rtd-theme,
pthreads in Windows builds had to be moved to buildInputs to fix
"Refusing to evaluate package 'mingw_w64-pthreads-13.0.0'
in /nix/store/f78lkqnk63pd0kf52zf2wcx35p1nnalr-source/pkgs/os-specific/windows/mingw-w64/headers.nix:35
because it is not available on the requested hostPlatform"