Artifact [572df6dd05]

Artifact 572df6dd05de503e4add227442f6204b586ef32faf9ed45ff86f632029771def:

• File simio/env.go — part of check-in [f5744359d3] at 2026-04-19 16:30:54 on branch trunk — Initial open source release

  libfossil is a pure-Go implementation of the Fossil SCM, reading and writing the same .fossil SQLite repository format as upstream Fossil.

  This is the first public release of code that previously lived in a private repository. The module path is github.com/danmestas/libfossil and the binary is named libfossil to avoid $PATH collisions with upstream fossil.

  Included: - Repo lifecycle (create, clone), checkout/checkin, timeline, merge, diff, annotate, shun, tag, branch, bisect, stash, undo/redo - Sync-over-HTTP protocol (client and handler) - Two SQLite drivers: modernc (pure Go, default) and ncruces (wasm-capable) - Observer interfaces (SyncObserver, CheckoutObserver) with an optional OpenTelemetry implementation in observer/otel (separate submodule) - Deterministic simulation testing harness with BUGGIFY fault injection - Kong-based embeddable CLI under cli/ and a standalone binary under cmd/libfossil/ (user: [email protected], size: 649) [annotate] [blame] [check-ins using]

package simio

// Env bundles all I/O abstractions needed for deterministic simulation.
// Pass *Env through call chains instead of threading individual interfaces.
type Env struct {
	Clock   Clock
	Rand    Rand
	Storage Storage
}

// RealEnv returns an Env wired to real system I/O (production use).
func RealEnv() *Env {
	return &Env{
		Clock:   RealClock{},
		Rand:    CryptoRand{},
		Storage: OSStorage{},
	}
}

// SimEnv returns an Env wired to deterministic implementations
// controlled by the given seed.
func SimEnv(seed int64) *Env {
	return &Env{
		Clock:   NewSimClock(),
		Rand:    NewSeededRand(seed),
		Storage: NewMemStorage(),
	}
}