pydd

Dynamic derivations, planned in Python. A planner is a derivation that decides at build time what Nix builds next. pydd plans Python environments from uv.lock and poetry.lock, with one derivation per package, on Nix master and on released Nix. It plans Cargo projects too, with one derivation per unit of cargo's unit graph, and npm projects, with one derivation per package of package-lock.json.

The README says how to use it. These pages hold what the work found.

Findings

• The modes, compared
  • The levels of restriction
  • Three ways to give a node stdenv
  • Measured
  • What each mode cannot do
  • What this asks of Nix
• A second ecosystem: Cargo
  • Cargo plans, pydd writes
  • One node per unit
  • Projects and sources
  • Tests
  • Real projects
  • Native libraries
  • A development shell
  • Cross-compilation
  • The modes
  • Compared with cargo-dyndrv
  • What is missing
• A third ecosystem: npm
  • The lock is the plan
  • Other locks: pnpm, bun and Yarn v1
  • One node per package
  • Install scripts
  • Other sources
  • Native inputs
  • The project
  • The modes
  • out: the host makes the graph
  • What is missing

Research notes of the ddrn lab

• Research notes
• The architecture of ddrn/examples/venv-graph
• Facts about Nix, and where each one comes from
• Facts about Python packaging in Nix, and where each one comes from
• What this lab wants to change in Nix