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Update Nix Dependencies

This document explains how to update various dependencies used in the nix configuration.

Updating Packer

Packer is used for creating machine images and is defined in nix/packages/packer.nix.

Steps to update Packer version:

  1. Bump version in nix/packages/packer.nix.
  2. Set hash = lib.fakeHash;, or an empty string.
  3. Run nix build .#packer, then copy the hash from the error into hash.
  4. Do the same for vendorHash.
  5. Run nix flake check -L.

Notes:

  • Always check the Packer changelog for breaking changes
  • Packer uses Go, so ensure compatibility with the Go version specified in the flake inputs
  • The current Go version is specified in flake.nix under nixpkgs-go124 input
  • If updating to a major version, test all packer templates (.pkr.hcl files) in the repository

Updating Other Dependencies

Similar patterns can be followed for other dependencies defined in the nix packages. Always:

  1. Check for breaking changes in changelogs
  2. Update version numbers and hashes
  3. Run local tests
  4. Verify functionality before creating PR