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daml/Upgrading.md
Moritz Kiefer aff53e256d
Document nixpkgs upgrades (#977)
2019-05-07 16:18:57 +02:00

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How to upgrade packages in this repo

Stackage

To update the Stackage snapshot you need to clone the hazel repository into a separate directory:

$ git clone https://github.com/tweag/rules_haskell.git

Change into the hazel directory.

$ cd rules_haskell/hazel

Then execute the following command to update to the specified Stackage snapshot, where $PROJECT points to the root of this repository: (Requires stack)

$ Stackage.hs lts-12.4 "$PROJECT/hazel/packages.bzl"

On NixOS you may need to modify Stackage.hs to append the following flag to the list of stack intrepreter flags: --nix-packages zlib.

This will take a while.

Nixpkgs

To update the nixpkgs revision, go to the nix/nixpkgs directory in this repository and run nix-update-src-json ./nixos-* to update to the latest release in the current NixOS channel. To upgrade to a new channel move nixos-18.09 to nixos-19.03 (adapt to the channels you want to move from and to), change the branch field in default.src.json and modify nix/nixpkgs.nix to point to the new channel.

After upgrading the revision, the easiest solution is usually to open a PR and see what fails on CI (running the builds locally can take quite some time). The most common reason for failures is usually that we have overriden a specific package with certain patches that no longer work. In that case, a good first step is to check if these patches are still necessary and if not try to switch to the unpatched package from nixpkgs.