dirsync

Overview ¶

Package dirsync opens a directory so that fsyncing it makes the creates, renames and removes inside it durable — the step the WAL, checkpoints and every design-time store take after changing a directory's entries.

On Unix that is just os.Open. Windows is why this package exists: os.Open gives a directory a read-only handle, and FlushFileBuffers requires a handle with write access, so the fsync is refused with "Access is denied". Opening the directory is the one step that differs, so it is the one step that lives here; each caller keeps its own Sync and its own error wording.