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banger/AGENTS.md
Thales Maciel 0a0b0b617b
Replace mapdns with daemon DNS 
Serve daemon-managed .vm names directly from bangerd on 127.0.0.1:42069 instead of shelling out to mapdns. This keeps DNS state tied to VM lifecycle and lets the daemon rebuild records from running VMs after startup or reconcile.

Add a small in-process authoritative DNS server, register and remove records from the VM start/stop/delete paths, and show the listener in daemon status. Remove the mapdns config and preflight surface, stop helper-flow DNS publishing in customize.sh and interactive.sh, drop dns.sh from the runtime bundle, and update docs/tests for the new local-resolver integration model.

Validated with GOCACHE=/tmp/banger-gocache go test ./..., GOCACHE=/tmp/banger-gocache make build, and bash -n customize.sh interactive.sh.
2026-03-17 15:49:35 -03:00

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Repository Guidelines

Project Structure & Module Organization

  • cmd/banger and cmd/bangerd are the primary user-facing entrypoints.
  • internal/ contains the daemon, CLI, RPC, storage, Firecracker, and system integration code.
  • customize.sh, make-rootfs.sh, and interactive.sh remain as image-build/customization helpers; normal VM lifecycle, NAT, and .vm DNS are handled by the Go control plane.
  • Source checkouts use a generated ./runtime/ bundle for Firecracker, kernels, modules, rootfs images, and helper copies. Bundle defaults come from ./runtime/bundle.json when present. Those runtime artifacts are not meant to be tracked directly in Git.
  • The daemon keeps state under XDG directories rather than the old repo-local state/ layout.

Build, Test, and Development Commands

  • make build builds ./banger and ./bangerd.
  • make runtime-bundle bootstraps ./runtime/ from the archive referenced by RUNTIME_MANIFEST; the checked-in runtime-bundle.toml is only a template.
  • banger validates required host tools per command and reports actionable missing-tool errors; do not assume one workstation's package set.
  • ./banger vm create --name testbox creates and starts a VM.
  • ./banger vm ssh testbox connects to a running guest.
  • ./banger vm stop testbox stops a VM while preserving its disks.
  • ./banger tui launches the terminal UI.
  • make test runs go test ./....
  • ./verify.sh runs the smoke test for the Go VM workflow.

Coding Style & Naming Conventions

  • Go code should stay small, direct, and standard-library-first unless there is a clear reason otherwise.
  • Shell helpers use Bash with set -euo pipefail; keep remaining shell scripts strict and explicit.
  • Prefer lowercase filenames with short descriptive names.
  • Use gofmt for Go formatting; no extra formatter is configured for shell files.

Testing Guidelines

  • Primary automated coverage is go test ./....
  • Manual verification for VM lifecycle changes: ./banger vm create, confirm SSH access, then stop/delete the VM.
  • If you add a new operational workflow, document how to exercise it in README.md.
  • For NAT changes, verify both guest outbound access and host rule cleanup, for example with ./verify.sh --nat.

Commit & Pull Request Guidelines

  • Git history uses short, imperative subjects.
  • Prefer a real commit body when the change affects lifecycle behavior, storage semantics, or host integration.
  • PRs should call out runtime requirements, migration impact, and any host-side verification performed.

Security & Configuration Tips

  • The VM workflow requires sudo and /dev/kvm access; do not commit secrets.
  • id_ed25519 lives inside the runtime bundle; rotate or replace it before publishing a shared bundle.