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fix: upgrade nixpkgs to 25.05 and pin protoc 23.4#26584

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fix: upgrade nixpkgs to 25.05 and pin protoc 23.4#26584
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george/upgrade-nixpkgs-to-2505

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@geokat geokat commented Jun 22, 2026 •
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nix develop and nix-shell were broken because the nixos-24.11 google-chrome derivation still pointed at Chrome 138, and Google no longer serves that versioned .deb:

$ nix-shell
these 2 derivations will be built:
  /nix/store/af59wjk8a8ys18bam92y3jns14pgj01n-google-chrome-stable_138.0.7204.49-1_amd64.deb.drv
  /nix/store/bc5fw07dw1f7g7y3yv7fricbynsnfx21-google-chrome-138.0.7204.49.drv
building '/nix/store/af59wjk8a8ys18bam92y3jns14pgj01n-google-chrome-stable_138.0.7204.49-1_amd64.deb.drv'...

trying https://dl.google.com/linux/chrome/deb/pool/main/g/google-chrome-stable/google-chrome-stable_138.0.7204.49-1_amd64.deb
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404
error: cannot download google-chrome-stable_138.0.7204.49-1_amd64.deb from any mirror
error: builder for '/nix/store/af59wjk8a8ys18bam92y3jns14pgj01n-google-chrome-stable_138.0.7204.49-1_amd64.deb.drv' failed with exit code 1;
       last 7 log lines:
       >
       > trying https://dl.google.com/linux/chrome/deb/pool/main/g/google-chrome-stable/google-chrome-stable_138.0.7204.49-1_amd64.deb
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
       > curl: (22) The requested URL returned error: 404
       > error: cannot download google-chrome-stable_138.0.7204.49-1_amd64.deb from any mirror
       For full logs, run 'nix-store -l /nix/store/af59wjk8a8ys18bam92y3jns14pgj01n-google-chrome-stable_138.0.7204.49-1_amd64.deb.drv'.
error: 1 dependencies of derivation '/nix/store/bc5fw07dw1f7g7y3yv7fricbynsnfx21-google-chrome-138.0.7204.49.drv' failed to build

This PR updates the flake's main nixpkgs input to nixos-25.05 so the shell resolves a current Chrome package again.

The 25.05 upgrade also removed the protobuf_23 attr. Rather than switching the shell to the channel-default protobuf package, pin protoc 23.4 explicitly from the upstream protobuf release archives. This keeps the local Nix shell aligned with mise.toml and the CI/release codegen toolchain.

Disclaimer: I'm not experienced with Nix, so I used an agent to write most of the fix. I checked the download URLs and ran make pre-commit, make pre-push and scripts/develop.sh locally (Ubuntu 24.04.4 LTS).

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datadog-coder Bot commented Jun 22, 2026 •
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@geokat geokat changed the title fix(flake.nix): upgrade nixpkgs to 25.05 and pin protoc 23.4 fix: upgrade nixpkgs to 25.05 and pin protoc 23.4 Jun 22, 2026
@geokat geokat marked this pull request as ready for review June 22, 2026 20:51
@geokat geokat requested a review from johnstcn June 22, 2026 20:51
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