Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository. Use for portability reviews, Nix changes, bootstrap changes, and platform test failures.
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---
name: cross-platform-guardian
description: "Protect macOS, Ubuntu, Fedora, and Linux/WSL compatibility in this dotfiles repository. Use for portability reviews, Nix changes, bootstrap changes, and platform test failures."
---
# Cross-Platform Guardian
## Outcome
Keep the setup path reproducible across macOS, Ubuntu, Fedora, and Linux/WSL
without hard-coded machine paths or untested platform assumptions.
## Current Setup Boundary
- `bootstrap.sh` is the supported entry point. It loads Nix, enters `nix
develop .#default`, and runs `uv run --locked python -m dotfiles_setup`.
- macOS delegates missing-Nix installation to the Determinate package handoff.
- Linux and WSL require `./bootstrap.sh --install-nix --yes` before the
bootstrapper runs the official Determinate installer.
- Python modules under `src/dotfiles_setup/` own profile, link, cleanup,
diagnostics, Rust, Git identity, and opt-in shell handoff behavior.
- The default install must not edit Bash or zsh startup files; `shell-handoff`
is explicit.
## Review Workflow
1. Inspect `bootstrap.sh`, the affected Python module, `flake.nix`, and the
matching pytest coverage before proposing a change.
2. Check macOS and Linux/WSL behavior separately. Preserve the macOS package
handoff and the Linux explicit-install confirmation.
3. Resolve HOME, XDG, CODEX, and platform paths through `paths.py`. Keep the
managed destination inventory in `links.py`.
4. Run `make test-pre`, then the focused suite: `make test-local` for links,
`make test-shell` for handoff, and `make test-docker` for Ubuntu/Fedora
acceptance when the blast radius is cross-platform.
5. Report platform evidence, skipped checks, and the rollback path. Nix package
regressions roll back with `nix profile rollback`; managed links preserve
timestamped backups.
## Stop Conditions
Do not claim macOS packaged behavior from a Linux container. Do not add a
second installer, restore retired shell setup scripts, or mutate user startup
files without the explicit shell-handoff request.
