Haskell package ignoring bounds on Darwin?

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1

The following command is succesfull on Darwin but fails on a NixOS machine:

nix-shell -p '(import (((import <nixpkgs> {}).fetchFromGitHub {
    owner = "NixOS";
    repo  = "nixpkgs";
    rev = "23fd1394dc6bef03a2ff010278a24403a97f0647";
    sha256 = "1snry2ab0gjhg394ryfw8jwswjyj31fjxv79pxk219r76031fx20";
})) {}).haskell.packages.ghc844.ghcWithPackages (pkgs: [ pkgs.system-fileio ])'

The linux build fails with:

...
Configuring system-fileio-0.3.16.4...
CallStack (from HasCallStack):
  die', called at libraries/Cabal/Cabal/Distribution/Simple/Configure.hs:958:20 in Cabal-2.2.0.1:Distribution.Simple.Configure
  configureFinalizedPackage, called at libraries/Cabal/Cabal/Distribution/Simple/Configure.hs:462:12 in Cabal-2.2.0.1:Distribution.Simple.Configure
  configure, called at libraries/Cabal/Cabal/Distribution/Simple.hs:596:20 in Cabal-2.2.0.1:Distribution.Simple
  confHook, called at libraries/Cabal/Cabal/Distribution/Simple/UserHooks.hs:67:5 in Cabal-2.2.0.1:Distribution.Simple.UserHooks
  configureAction, called at libraries/Cabal/Cabal/Distribution/Simple.hs:178:19 in Cabal-2.2.0.1:Distribution.Simple
  defaultMainHelper, called at libraries/Cabal/Cabal/Distribution/Simple.hs:115:27 in Cabal-2.2.0.1:Distribution.Simple
  defaultMain, called at Setup.hs:2:8 in main:Main
Setup: Encountered missing dependencies:
chell ==0.4.*
...

The bound on system-fileio version 0.3.16.4 indeed constraints chell to chell >= 0.4 && < 0.5 (source), but the used nixpkgs contains only chell v0.5:

nix-instantiate --eval -E '(import (((import <nixpkgs> {}).fetchFromGitHub {
    owner = "NixOS";
    repo  = "nixpkgs";
    rev = "23fd1394dc6bef03a2ff010278a24403a97f0647";
    sha256 = "1snry2ab0gjhg394ryfw8jwswjyj31fjxv79pxk219r76031fx20";
})) {}).haskell.packages.ghc844.chell.version'
"0.5"

so the failure is to be expected.

There don’t seem to be any overrides in nixpkgs related to system-fileio as far as I could see.

I am really more interested in how this happened rather than how to fix it (I can just manually override the package).

2

Unrelated, but please use builtins.fetchGit instead of nixpkgs.fetchFromGitHub to avoid importing from a derivation.

2 Likes
3

builtins.fetchGit is disabled in pure evaluation mode though, so I cannot pin my nixpkgs if I want to run it in hydra

4

chell is a test suite dependency of system-fileio. Most likely someone has set dontCheck on Darwin

5

ok, I just forgot that I need to add the repo url in the allowed-uris nix configuration option.

6

You were right - it’s set in configuration-nix.nix:

# the system-fileio tests use canonicalizePath, which fails in the sandbox
system-fileio = if pkgs.stdenv.isDarwin then dontCheck super.system-fileio else super.system-fileio;

I get the same behaviour with master:

nix-shell -p '(import (builtins.fetchGit {
    url = "https://github.com/NixOS/nixpkgs.git";
    ref = "master";
}) {}).haskell.packages.ghc844.ghcWithPackages (pkgs: [ pkgs.system-fileio ])'

I’m finding it a bit confusing that some packages are marked as broken, but some are not but still fail to build.

Should I submit a PR to disable the tests on all platforms?