Method pumpMapToChan

fs/sync/sync.go:302–316

This reads the map and pumps it into the channel passed in, closing the channel at the end

(files map[string]fs.Object, out chan<- fs.Object)

// This reads the map and pumps it into the channel passed in, closing
// the channel at the end
func (s *syncCopyMove) pumpMapToChan(files map[string]fs.Object, out chan<- fs.Object) {
outer:
	for _, o := range files {
		if s.aborting() {
			break outer
		}
		select {
		case out <- o:
		case <-s.ctx.Done():
			break outer
		}
	}
	close(out)
	s.srcFilesResult <- nil
}

// This checks the types of errors returned while copying files
func (s *syncCopyMove) processError(err error) {