func zipEntries(readers map[string]entryReader, out *zip.Writer) error {
defer trace.End(trace.Begin(""))
defer out.Close()
defer out.Flush()
for name, r := range readers {
log.Infof("Collecting log with reader %s(%#v)", name, r)
e, err := r.open()
if err != nil {
log.Warningf("error reading %s(%s): %s\n", name, r, err)
continue
}
sz := e.Size()
header := &zip.FileHeader{
Name: name,
Method: zip.Deflate,
}
header.SetModTime(time.Now())
header.SetMode(0644)
if sz > uint32max {
header.UncompressedSize = uint32max
} else {
header.UncompressedSize = uint32(e.Size())
}
w, err := out.CreateHeader(header)
if err != nil {
log.Errorf("Failed to create Zip writer for %s: %s", header.Name, err)
continue
}
log.Infof("%s has size %d", header.Name, sz)
// be explicit about the number of bytes to copy as the log files will likely
// be written to during this exercise
_, err = io.CopyN(w, e, sz)
_ = e.Close()
if err != nil {
log.Errorf("Failed to write content for %s: %s", header.Name, err)
continue
}
log.Infof("Wrote %d bytes to %s", sz, header.Name)
}
return nil
}
