func (conn *Conn) addCharm(curl *charm.URL, ch charm.Charm) (*state.Charm, error) { var f *os.File name := charm.Quote(curl.String()) switch ch := ch.(type) { case *charm.Dir: var err error if f, err = ioutil.TempFile("", name); err != nil { return nil, err } defer os.Remove(f.Name()) defer f.Close() err = ch.BundleTo(f) if err != nil { return nil, fmt.Errorf("cannot bundle charm: %v", err) } if _, err := f.Seek(0, 0); err != nil { return nil, err } case *charm.Bundle: var err error if f, err = os.Open(ch.Path); err != nil { return nil, fmt.Errorf("cannot read charm bundle: %v", err) } defer f.Close() default: return nil, fmt.Errorf("unknown charm type %T", ch) } h := sha256.New() size, err := io.Copy(h, f) if err != nil { return nil, err } digest := hex.EncodeToString(h.Sum(nil)) if _, err := f.Seek(0, 0); err != nil { return nil, err } storage := conn.Environ.Storage() log.Infof("writing charm to storage [%d bytes]", size) if err := storage.Put(name, f, size); err != nil { return nil, fmt.Errorf("cannot put charm: %v", err) } ustr, err := storage.URL(name) if err != nil { return nil, fmt.Errorf("cannot get storage URL for charm: %v", err) } u, err := url.Parse(ustr) if err != nil { return nil, fmt.Errorf("cannot parse storage URL: %v", err) } log.Infof("adding charm to state") sch, err := conn.State.AddCharm(ch, curl, u, digest) if err != nil { return nil, fmt.Errorf("cannot add charm: %v", err) } return sch, nil }