func fetchCandidates(can *resolver.Candidates, url string) error {
for _, comp := range compressions {
resp, err := http.Get(url + comp)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
resp.Body.Close()
continue
}
defer resp.Body.Close()
switch comp {
case ".xz":
reader, err := xz.NewReader(resp.Body, 0)
if err != nil {
return err
}
return can.AppendBinaryIndexReader(reader)
case ".bz2":
return can.AppendBinaryIndexReader(bzip2.NewReader(resp.Body))
case ".gz":
reader, err := gzip.NewReader(resp.Body)
if err != nil {
return err
}
defer reader.Close()
return can.AppendBinaryIndexReader(reader)
}
return can.AppendBinaryIndexReader(resp.Body)
}
return fmt.Errorf("unable to find %s (tried all of %q)", url, compressions)
}
