func doSyncCmdSession(bar barSend, s *sessionV1) <-chan syncSession {
ssCh := make(chan syncSession)
// Separate source and target. 'sync' can take only one source.
// but any number of targets, even the recursive URLs mixed in-between.
sourceURL := s.URLs[0] // first one is source
targetURLs := s.URLs[1:]
go func(sourceURL string, targetURLs []string, bar barSend, ssCh chan syncSession, s *sessionV1) {
defer close(ssCh)
go trapSync(ssCh)
var lock countlock.Locker
if !globalQuietFlag {
// Keep progress-bar and copy routines in sync.
lock = countlock.New()
defer lock.Close()
}
wg := new(sync.WaitGroup)
syncQueue := make(chan bool, int(math.Max(float64(runtime.NumCPU())-1, 1)))
defer close(syncQueue)
go doPrepareSyncURLs(sourceURL, targetURLs, bar, lock)
for sURLs := range prepareSyncURLs(sourceURL, targetURLs) {
if sURLs.Error != nil {
ssCh <- syncSession{
Error: iodine.New(sURLs.Error, nil),
Done: false,
}
continue
}
syncQueue <- true
wg.Add(1)
if !globalQuietFlag {
lock.Down() // Do not jump ahead of the progress bar builder above.
}
go doSyncSession(sURLs, &bar, syncQueue, ssCh, wg, s)
}
wg.Wait()
}(sourceURL, targetURLs, bar, ssCh, s)
return ssCh
}
