func (t *Tailer) startNewFile(f afero.File, seekStart bool) error {
fi, err := f.Stat()
if err != nil {
// Stat failed, log error and return.
logErrors.Add(f.Name(), 1)
return fmt.Errorf("Failed to stat %q: %s", f.Name(), err)
}
switch m := fi.Mode(); {
case m&os.ModeType == 0:
if seekStart {
f.Seek(0, os.SEEK_SET)
} else {
f.Seek(0, os.SEEK_END)
}
err = t.w.Add(f.Name())
if err != nil {
return fmt.Errorf("Adding a change watch failed on %q: %s", f.Name(), err)
}
// In case the new log has been written to already, attempt to read the
// first lines.
t.partials[f.Name()], err = t.read(f, "")
if err != nil {
if err == io.EOF {
// Don't worry about EOF on first read, that's expected.
break
}
return err
}
case m&os.ModeType == os.ModeNamedPipe:
go t.readForever(f)
default:
return fmt.Errorf("Can't open files with mode %v: %s", m&os.ModeType, f.Name())
}
t.filesLock.Lock()
t.files[f.Name()] = f
t.filesLock.Unlock()
glog.Infof("Tailing %s", f.Name())
return nil
}
