Bazel & Nix & Dhall Monorepo example

• nix for reproducibility and isolated environment
• bazel for fast incremental rebuilds and module query system
• dhall for converting and spread configuration to targets, like nix, bazel.

Features & Integration

• ide integration - bazel does not work pretty well with ide's - there is custom pom generation based on bazel-tools/pom.bzl which generate local deps as well, so from ide perspective all are treated as maven dependencies

Assumptions

• each module can carry some binary
• each module can produce docker
• modules can be referenced locally and autocompletion works from ide perspective
• fast incremental reproducible & remote builds

Stack

• nixpkgs
• bazel
• niv
• lorri
• dir-env
• dhall

Related articles

• https://github.com/tweag/rules_nixpkgs

Caveats / Limitations

• lsp from binary not from nix - https://github.com/dhall-lang/dhall-haskell/releases
• nixpkgs on catalina, related, fixes

TODO

• create custom nix script as a dependency of binary file for module (done) with buildInputs (? - has to be defined manually)
• shell - run bazel -> generate poms (bazel build + symlink)