//go:build smoke

// Package smoketest is the end-to-end smoke gate for banger's supported
// two-service systemd model. It runs only when the build is tagged
// `smoke`, which keeps it out of `go test ./...` on contributor
// machines and CI.
//
// The suite touches global host state: it installs instrumented
// bangerd.service + bangerd-root.service, drives real Firecracker/KVM
// scenarios, copies covdata back out, then purges the smoke-owned
// install on exit. It refuses to run if a non-smoke install is already
// on the host (see the marker file under /etc/banger).
//
// The harness expects three env vars, normally set by `make smoke`:
//
//	BANGER_SMOKE_BIN_DIR    — instrumented banger / bangerd / vsock-agent
//	BANGER_SMOKE_COVER_DIR  — coverage output directory (GOCOVERDIR)
//	BANGER_SMOKE_XDG_DIR    — scratch root for fake homes, fake repos, etc.
//
// Coverage: the test binary itself is not instrumented, but every
// banger / bangerd subprocess it spawns is, and writes covdata into
// BANGER_SMOKE_COVER_DIR. Service-side covdata under /var/lib/banger
// is copied out at teardown.
package smoketest