Stream: Coq users

Topic: Nix CI hash error

Karl Palmskog (May 31 2020 at 17:23):

I started seeing errors like this with Travis using CI via Nix a few minutes ago:

$ nix-build --argstr coq-version-or-url "$COQ" --extra-substituters https://coq.cachix.org --trusted-public-keys "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= coq.cachix.org-1:5QW/wwEnD+l2jvN6QRbRRsa4hBHG3QiQQ26cxu1F5tI="

error: unknown hash algorithm '', at /nix/store/fhksmnm8dk9b1hs99sfzha4nwvpfs86n-nixpkgs-20.09pre227892.b27a19d5bf7/nixpkgs/pkgs/build-support/fetchurl/default.nix:119:3

Did something happen to cachix?

Théo Zimmermann (May 31 2020 at 17:25):

That's weird. Can you give me a pointer to a log?

Karl Palmskog (May 31 2020 at 17:26):

Good build: https://travis-ci.org/github/DistributedComponents/InfSeqExt/builds/693164017
Bad build of same code 2h later: https://travis-ci.org/github/DistributedComponents/InfSeqExt/builds/693189325

Karl Palmskog (May 31 2020 at 17:27):

this uses default.nix via templates btw

Karl Palmskog (May 31 2020 at 17:29):

note that that repo is stuck on travis.org which I can't change, but it's not obvious how this could be the culprit

Théo Zimmermann (May 31 2020 at 17:29):

The first thing I notice is that it is only on released versions (in nixpkgs), so likely not something to do with Cachix.

Théo Zimmermann (May 31 2020 at 17:34):

I thought this could have been a problem introduced in nixpkgs-unstable very recently, but https://status.nixos.org/ reports that this channel is 9 days old.

Karl Palmskog (May 31 2020 at 17:35):

I guess it could be a local problem of some sort (e.g., due to different Travis). I'll see if I can reproduce on some other project.

Théo Zimmermann (May 31 2020 at 17:37):

This is likely unrelated but you may try to activate sandbox builds as documented on the bottom of this page: https://nixos.wiki/wiki/Nix_on_Travis

Théo Zimmermann (Jun 01 2020 at 08:09):

I just got the same error here: https://travis-ci.com/github/Zimmi48/corn/builds/168940729

Karl Palmskog (Jun 01 2020 at 08:15):

ah, then it wasn't just some weird local event, and also not limited to travis dot org.

Théo Zimmermann (Jun 01 2020 at 11:24):

OK, this time, this is is NixOS/nixpkgs#89275

Théo Zimmermann (Jun 01 2020 at 12:14):

I've pushed a fix in the templates repository.

Karl Palmskog (Jun 02 2020 at 14:53):

ah, this seems to solve that particular problem but now it seems the behavior for executing scripts has changed, e.g., I had a small configure script in a project with #/usr/bin/env bash, but now I get:

/nix/store/b0jz23gnnyjrr72rz36xkc3wr36isky6-stdenv-linux/setup: ./configure: /usr/bin/env: bad interpreter: No such file or directory

which did not happen before.

Théo Zimmermann (Jun 02 2020 at 15:10):

Did you also introduce sandboxed builds at the same time?

Karl Palmskog (Jun 02 2020 at 15:17):

nope, the only change was nix: 2.3.5, but maybe this sets sandboxed builds by default?

Théo Zimmermann (Jun 02 2020 at 15:18):

Maybe. Can you try adding:

  preConfigure = ''
    patchShebangs configure
  '';

to your default.nix? It should likely fix your problem.

Karl Palmskog (Jun 02 2020 at 15:40):

that did indeed fix the problem, thanks!

Last updated: Oct 13 2024 at 01:02 UTC