Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

[Unreleased]

Added

• libfossil version prints a single, stable, machine-parseable build identifier -- module version (or a -ldflags -X github.com/danmestas/go-libfossil/cli.buildVersion=... override for release builds), Go toolchain version, and platform -- and exits 0. Previously version was not a recognized command at all and fell through to the unrecognized-argument path. There is no global --version flag: repo extract already owns --version as a command-scoped flag (the source version to extract), and kong's global flags are visible in every subcommand's context, so a root-level --version would collide with it.
• libfossil repo serve CLI command wires the already-public Repo.ServeHTTP xfer HTTP server into the command surface. A repository created or cloned with this tool can now be served to a peer -- including a stock fossil clone -- without writing Go. Binds to 127.0.0.1:8080 by default; override with --addr host:port. Process interrupt (Ctrl-C/SIGTERM) cancels the same context ServeHTTP already shuts down on; no new shutdown mechanism was introduced.

Fixed

• A clone from a libfossil server could fail with a card-syntax error (decode card 16303: empty line after split) naming a card the response never contained. The message decoder tried three body framings in order and treated any decompression failure as "not this framing", so a well-formed compressed body that exceeded the decoder's own size bound fell through to the uncompressed branch and the still-compressed bytes were parsed as card text — thousands of nonsense cards until one split into no fields. Worse than the misleading error, an oversize or truncated compressed body was accepted: the garbage cards decoded without error and the artifacts they carried failed their hash check downstream. A body recognizable as zlib is now decompressed or reported, never reparsed. The bound is also raised to 64 MiB, since it sat below what this implementation's own server emits in a single clone round — two libfossil peers could not reliably clone from each other even though each could clone from fossil. Two compile-time guards constrain the bound: it must clear the server's clone batch budget twice over, and it must stay below the size at which a length prefix this implementation writes could itself be read as a zlib header. Neither guard certifies a whole round — the budget bounds what precedes an artifact, not the artifact, so a large artifact that does not lead its round can still overrun the bound (#109). (#104)
• Committing a file with zero-length content panicked in blob.Store, which treated an empty artifact -- a normal, well-known Fossil blob -- as invalid input; the panic then triggered manifest.Checkin's postcondition defer, which re-panicked with an unrelated "manifestRid must be positive" message that masked the real cause. blob.Store now accepts zero-length (and nil) content, and Checkin's defer re-panics with the original panic value instead of asserting a postcondition that was never going to hold mid-unwind (#68).
• A commit no longer silently carries a tracked file's last-committed content forward when that file has been deleted from disk without Unmanage/Remove -- it now fails clearly, naming the file, matching fossil's own behavior for a missing file that is in scope for the commit being made. A missing file outside the commit's scope (relevant only to an explicit Enqueue) is left untouched exactly as before (#79).

Changed

• Breaking: StatusOpts, MergeOpts, and CheckoutOpts have been removed. No function anywhere accepted any of the three, and nothing constructed one: Checkout.Status() takes zero arguments, Repo.Merge takes positional string arguments, and CheckoutOpts had no construction site at all. A public type with no call site documents a capability that does not exist — a consumer reading MergeOpts{Strategy: ...} in the docs could reasonably conclude a strategy-selecting merge API exists; it never did. Repo.Merge and Checkout.Status keep their current signatures — an options-struct refactor for Merge was considered and declined. CheckoutOpts.Force was also a third same-named Force field in this package, alongside the already-removed UpdateOpts.Force and the real, fully-wired ExtractOpts.Force; removing it also removes that readability hazard. ExtractOpts.Force is unrelated and unaffected.
• Breaking: CloneOpts.ProjectCode and CloneOpts.ServerCode have been removed. Neither was ever wired to anything — Clone accepted both fields but never forwarded them to the internal clone path, so setting either had no effect and gave no error. The internal clone options struct has no matching fields at all, so wiring them would mean designing semantics first (is a caller-supplied code a validation assertion or an identity override?) and no caller has asked for that. CloneResult.ProjectCode and CloneResult.ServerCode are unrelated and unaffected — they continue to report both, populated from the remote via the clone protocol negotiation, which is the only place they meaningfully originate.
• Breaking: UpdateOpts.Force has been removed. It was never wired to anything — Checkout.Update accepted the field but never forwarded it to the internal update path, so setting it had no effect and gave no error. Deleting it is honest about what the API actually does; real forcing semantics for Update can be designed and added later as a new, deliberately-wired field if a caller needs them. ExtractOpts.Force is unrelated and unaffected — it is fully wired and unchanged.
• Breaking: Checkout.Update now returns (UpdateResult, error) instead of a bare error. The internal 3-way merge already tracked which files were written, removed, and left with conflict markers; the old signature discarded all of it, so a caller could not tell a clean update from one that silently wrote <<<<<<< conflict markers into working-tree files. UpdateResult.Conflicted lists the paths that were merged but not cleanly — this is a successful update (err == nil), not an error; a genuine failure still returns a non-nil error with a zero-value UpdateResult. Checkout.Extract is unchanged.
• Breaking: Repo.Timeline now enumerates the repository's event table newest-first (every event kind by default, or a single kind via TimelineOpts.Type), matching canonical fossil timeline. The previous behavior — a first-parent walk from a required start rid — is preserved under a new, honestly-named method, Repo.Ancestry(LogOpts). The old Repo.Timeline(LogOpts) was actually an ancestry walk masquerading as an enumeration: it never visited a second parent or a sibling branch head, so it silently omitted any check-in that wasn't a first-parent ancestor of the given start rid. There is no deprecated shim; callers of the old Timeline should switch to Ancestry if they want the walk, or adopt the new Timeline(TimelineOpts) if they want a full enumeration.
• LogEntry gains a Kind field (EventKind) identifying which of event.type's six kinds (ci, e, f, g, t, w) an entry is. Parents is only populated for Kind == EventKindCheckin.
• Breaking: Repo.Timeline orders by (mtime DESC, rid DESC), a total order with rid as a true tie-break at exact mtime equality — a deliberate improvement over canonical fossil's bare mtime DESC with no tie-break, which can repeat or skip rows at a page boundary. Pagination uses a new opaque Cursor type: take one from a returned LogEntry.Cursor and pass it back as TimelineOpts.After to resume immediately after that entry. TimelineOpts.Before time.Time and TimelineOpts.After FslID are deleted, not deprecated — callers constructing either field will fail to compile. Cursor's representation is intentionally hidden — it can only be obtained from a LogEntry, never built from a timestamp and a rid by hand, because a hand-built cursor derived from a rounded time.Time is not guaranteed to match its row exactly, which is what reintroduces skipped or duplicated rows at a page boundary in the first place.
• Breaking: LogEntry no longer has a Cursor field, and Repo.Timeline now returns []TimelineEntry instead of []LogEntry. LogEntry is Repo.Ancestry's result type; its cursor was always the zero value, which is structurally identical to a legitimate Timeline first-page call — so feeding an Ancestry entry's cursor into TimelineOpts.After silently paginated from page one forever with no error, and documenting the field as invalid on Ancestry entries did nothing to stop it. TimelineEntry (which embeds LogEntry and adds Cursor Cursor) is now Repo.Timeline's result type, so the cursor lives only on the type that has one to give. Callers that read entry.Cursor, entry.UUID, entry.User, etc. off a Repo.Timeline result need no source change — those fields are still reachable through TimelineEntry's embedded LogEntry. Callers that stored a Repo.Timeline result as []LogEntry (rather than letting := infer the type, or using []TimelineEntry) will fail to compile.

[0.1.0] - 2026-04-20

Initial open-source release of libfossil, a pure-Go implementation of the Fossil SCM that reads and writes the same .fossil SQLite repository format.

Added

• Repository lifecycle: create new repos and clone from existing ones.
• Working-tree operations: checkout and checkin.
• Timeline traversal over commits and events.
• Merge and rebase primitives.
• Diff and annotate (blame) over tracked content.
• Manifest parsing and content-addressed blob storage.
• Sync protocol client/server for pulling and pushing between repos.
• Observer interfaces for sync and checkout, allowing external hooks into both network sync events and working-tree state transitions.
• SQLite driver abstraction with support for both modernc.org/sqlite (pure Go) and ncruces/go-sqlite3 (cgo-free, wasm-based) backends.
• Deterministic simulation test harness with BUGGIFY-style fault injection for exercising concurrency and failure paths.
• OpenTelemetry observer provided as a separate submodule to keep the core dependency footprint small.
• wasip1/wasm build target for running libfossil under WASI runtimes.