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Haskell.nix Nixpkgs Pin
Haskell.nix contains a Nixpkgs pin in
nixpkgs/github.json.
This is the version of Nixpkgs used for builds of nix-tools and
running the tests.
To use haskell.nix the config and overlays need to be applied to
Nixpkgs. Users should probably pin a suitable version of nixpkgs, although things might not work for them if their Nixpkgs version is
too different.
We aim to keep this pin somewhere on a channel of the Nixpkgs latest stable release. That is currently 19.09.
We also execute tests on MacOS (darwin). The darwin channel is usually
behind the NixOS channel. So we choose the nixpkgs-19.09-darwin
channel:
nix-prefetch-git https://github.com/NixOS/nixpkgs-channels refs/heads/nixpkgs-19.09-darwin
Keep the URL in github.json pointing at
https://github.com/NixOS/nixpkgs. Case matters because the Hydra
trusted URL whitelist is case-sensitive.