Function sync 

pub fn sync(
    store: &mut Store,
    repo: &Repo,
    cache: &ObjectCache,
    extractor: &dyn Extractor,
) -> Result<SyncReport, SyncError>

Sync store to the repository’s HEAD tree, extracting changed blobs with extractor and caching results in cache.

Errors

Returns a SyncError if git access, extraction caching, or the store rebuild fails.