package registry import ( "bytes" "crypto/sha256" _ "crypto/sha512" "encoding/json" "errors" "fmt" "io" "io/ioutil" "net" "net/http" "net/http/cookiejar" "net/url" "regexp" "runtime" "strconv" "strings" "time" "github.com/dotcloud/docker/dockerversion" "github.com/dotcloud/docker/utils" ) var ( ErrAlreadyExists = errors.New("Image already exists") ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")") errLoginRequired = errors.New("Authentication is required.") ) func pingRegistryEndpoint(endpoint string) (RegistryInfo, error) { if endpoint == IndexServerAddress() { // Skip the check, we now this one is valid // (and we never want to fallback to http in case of error) return RegistryInfo{Standalone: false}, nil } httpDial := func(proto string, addr string) (net.Conn, error) { // Set the connect timeout to 5 seconds conn, err := net.DialTimeout(proto, addr, time.Duration(5)*time.Second) if err != nil { return nil, err } // Set the recv timeout to 10 seconds conn.SetDeadline(time.Now().Add(time.Duration(10) * time.Second)) return conn, nil } httpTransport := &http.Transport{ Dial: httpDial, Proxy: http.ProxyFromEnvironment, } client := &http.Client{Transport: httpTransport} resp, err := client.Get(endpoint + "_ping") if err != nil { return RegistryInfo{Standalone: false}, err } defer resp.Body.Close() jsonString, err := ioutil.ReadAll(resp.Body) if err != nil { return RegistryInfo{Standalone: false}, fmt.Errorf("Error while reading the http response: %s", err) } // If the header is absent, we assume true for compatibility with earlier // versions of the registry. default to true info := RegistryInfo{ Standalone: true, } if err := json.Unmarshal(jsonString, &info); err != nil { utils.Debugf("Error unmarshalling the _ping RegistryInfo: %s", err) // don't stop here. Just assume sane defaults } if hdr := resp.Header.Get("X-Docker-Registry-Version"); hdr != "" { utils.Debugf("Registry version header: '%s'", hdr) info.Version = hdr } utils.Debugf("RegistryInfo.Version: %q", info.Version) standalone := resp.Header.Get("X-Docker-Registry-Standalone") utils.Debugf("Registry standalone header: '%s'", standalone) // Accepted values are "true" (case-insensitive) and "1". if strings.EqualFold(standalone, "true") || standalone == "1" { info.Standalone = true } else if len(standalone) > 0 { // there is a header set, and it is not "true" or "1", so assume fails info.Standalone = false } utils.Debugf("RegistryInfo.Standalone: %q", info.Standalone) return info, nil } func validateRepositoryName(repositoryName string) error { var ( namespace string name string ) nameParts := strings.SplitN(repositoryName, "/", 2) if len(nameParts) < 2 { namespace = "library" name = nameParts[0] } else { namespace = nameParts[0] name = nameParts[1] } validNamespace := regexp.MustCompile(`^([a-z0-9_]{4,30})$`) if !validNamespace.MatchString(namespace) { return fmt.Errorf("Invalid namespace name (%s), only [a-z0-9_] are allowed, size between 4 and 30", namespace) } validRepo := regexp.MustCompile(`^([a-z0-9-_.]+)$`) if !validRepo.MatchString(name) { return fmt.Errorf("Invalid repository name (%s), only [a-z0-9-_.] are allowed", name) } return nil } // Resolves a repository name to a hostname + name func ResolveRepositoryName(reposName string) (string, string, error) { if strings.Contains(reposName, "://") { // It cannot contain a scheme! return "", "", ErrInvalidRepositoryName } nameParts := strings.SplitN(reposName, "/", 2) if len(nameParts) == 1 || (!strings.Contains(nameParts[0], ".") && !strings.Contains(nameParts[0], ":") && nameParts[0] != "localhost") { // This is a Docker Index repos (ex: samalba/hipache or ubuntu) err := validateRepositoryName(reposName) return IndexServerAddress(), reposName, err } hostname := nameParts[0] reposName = nameParts[1] if strings.Contains(hostname, "index.docker.io") { return "", "", fmt.Errorf("Invalid repository name, try \"%s\" instead", reposName) } if err := validateRepositoryName(reposName); err != nil { return "", "", err } return hostname, reposName, nil } // this method expands the registry name as used in the prefix of a repo // to a full url. if it already is a url, there will be no change. // The registry is pinged to test if it http or https func ExpandAndVerifyRegistryUrl(hostname string) (string, error) { if strings.HasPrefix(hostname, "http:") || strings.HasPrefix(hostname, "https:") { // if there is no slash after https:// (8 characters) then we have no path in the url if strings.LastIndex(hostname, "/") < 9 { // there is no path given. Expand with default path hostname = hostname + "/v1/" } if _, err := pingRegistryEndpoint(hostname); err != nil { return "", errors.New("Invalid Registry endpoint: " + err.Error()) } return hostname, nil } endpoint := fmt.Sprintf("https://%s/v1/", hostname) if _, err := pingRegistryEndpoint(endpoint); err != nil { utils.Debugf("Registry %s does not work (%s), falling back to http", endpoint, err) endpoint = fmt.Sprintf("http://%s/v1/", hostname) if _, err = pingRegistryEndpoint(endpoint); err != nil { //TODO: triggering highland build can be done there without "failing" return "", errors.New("Invalid Registry endpoint: " + err.Error()) } } return endpoint, nil } func setTokenAuth(req *http.Request, token []string) { if req.Header.Get("Authorization") == "" { // Don't override req.Header.Set("Authorization", "Token "+strings.Join(token, ",")) } } // Retrieve the history of a given image from the Registry. // Return a list of the parent's json (requested image included) func (r *Registry) GetRemoteHistory(imgID, registry string, token []string) ([]string, error) { req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/ancestry", nil) if err != nil { return nil, err } setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode != 200 { if res.StatusCode == 401 { return nil, errLoginRequired } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Server error: %d trying to fetch remote history for %s", res.StatusCode, imgID), res) } jsonString, err := ioutil.ReadAll(res.Body) if err != nil { return nil, fmt.Errorf("Error while reading the http response: %s", err) } utils.Debugf("Ancestry: %s", jsonString) history := new([]string) if err := json.Unmarshal(jsonString, history); err != nil { return nil, err } return *history, nil } // Check if an image exists in the Registry // TODO: This method should return the errors instead of masking them and returning false func (r *Registry) LookupRemoteImage(imgID, registry string, token []string) bool { req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil) if err != nil { utils.Errorf("Error in LookupRemoteImage %s", err) return false } setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { utils.Errorf("Error in LookupRemoteImage %s", err) return false } res.Body.Close() return res.StatusCode == 200 } // Retrieve an image from the Registry. func (r *Registry) GetRemoteImageJSON(imgID, registry string, token []string) ([]byte, int, error) { // Get the JSON req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil) if err != nil { return nil, -1, fmt.Errorf("Failed to download json: %s", err) } setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { return nil, -1, fmt.Errorf("Failed to download json: %s", err) } defer res.Body.Close() if res.StatusCode != 200 { return nil, -1, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res) } // if the size header is not present, then set it to '-1' imageSize := -1 if hdr := res.Header.Get("X-Docker-Size"); hdr != "" { imageSize, err = strconv.Atoi(hdr) if err != nil { return nil, -1, err } } jsonString, err := ioutil.ReadAll(res.Body) if err != nil { return nil, -1, fmt.Errorf("Failed to parse downloaded json: %s (%s)", err, jsonString) } return jsonString, imageSize, nil } func (r *Registry) GetRemoteImageLayer(imgID, registry string, token []string) (io.ReadCloser, error) { req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/layer", nil) if err != nil { return nil, fmt.Errorf("Error while getting from the server: %s\n", err) } setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { return nil, err } if res.StatusCode != 200 { res.Body.Close() return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)", res.StatusCode, imgID) } return res.Body, nil } func (r *Registry) GetRemoteTags(registries []string, repository string, token []string) (map[string]string, error) { if strings.Count(repository, "/") == 0 { // This will be removed once the Registry supports auto-resolution on // the "library" namespace repository = "library/" + repository } for _, host := range registries { endpoint := fmt.Sprintf("%srepositories/%s/tags", host, repository) req, err := r.reqFactory.NewRequest("GET", endpoint, nil) if err != nil { return nil, err } setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { return nil, err } utils.Debugf("Got status code %d from %s", res.StatusCode, endpoint) defer res.Body.Close() if res.StatusCode != 200 && res.StatusCode != 404 { continue } else if res.StatusCode == 404 { return nil, fmt.Errorf("Repository not found") } result := make(map[string]string) rawJSON, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } if err := json.Unmarshal(rawJSON, &result); err != nil { return nil, err } return result, nil } return nil, fmt.Errorf("Could not reach any registry endpoint") } func buildEndpointsList(headers []string, indexEp string) ([]string, error) { var endpoints []string parsedUrl, err := url.Parse(indexEp) if err != nil { return nil, err } var urlScheme = parsedUrl.Scheme // The Registry's URL scheme has to match the Index' for _, ep := range headers { epList := strings.Split(ep, ",") for _, epListElement := range epList { endpoints = append( endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, strings.TrimSpace(epListElement))) } } return endpoints, nil } func (r *Registry) GetRepositoryData(remote string) (*RepositoryData, error) { indexEp := r.indexEndpoint repositoryTarget := fmt.Sprintf("%srepositories/%s/images", indexEp, remote) utils.Debugf("[registry] Calling GET %s", repositoryTarget) req, err := r.reqFactory.NewRequest("GET", repositoryTarget, nil) if err != nil { return nil, err } if r.authConfig != nil && len(r.authConfig.Username) > 0 { req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) } req.Header.Set("X-Docker-Token", "true") res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode == 401 { return nil, errLoginRequired } // TODO: Right now we're ignoring checksums in the response body. // In the future, we need to use them to check image validity. if res.StatusCode != 200 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code: %d", res.StatusCode), res) } var tokens []string if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] } var endpoints []string if res.Header.Get("X-Docker-Endpoints") != "" { endpoints, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], indexEp) if err != nil { return nil, err } } else { // Assume the endpoint is on the same host u, err := url.Parse(indexEp) if err != nil { return nil, err } endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", u.Scheme, req.URL.Host)) } checksumsJSON, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } remoteChecksums := []*ImgData{} if err := json.Unmarshal(checksumsJSON, &remoteChecksums); err != nil { return nil, err } // Forge a better object from the retrieved data imgsData := make(map[string]*ImgData) for _, elem := range remoteChecksums { imgsData[elem.ID] = elem } return &RepositoryData{ ImgList: imgsData, Endpoints: endpoints, Tokens: tokens, }, nil } func (r *Registry) PushImageChecksumRegistry(imgData *ImgData, registry string, token []string) error { utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/checksum") req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/checksum", nil) if err != nil { return err } setTokenAuth(req, token) req.Header.Set("X-Docker-Checksum", imgData.Checksum) req.Header.Set("X-Docker-Checksum-Payload", imgData.ChecksumPayload) res, err := r.client.Do(req) if err != nil { return fmt.Errorf("Failed to upload metadata: %s", err) } defer res.Body.Close() if len(res.Cookies()) > 0 { r.client.Jar.SetCookies(req.URL, res.Cookies()) } if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return fmt.Errorf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err) } var jsonBody map[string]string if err := json.Unmarshal(errBody, &jsonBody); err != nil { errBody = []byte(err.Error()) } else if jsonBody["error"] == "Image already exists" { return ErrAlreadyExists } return fmt.Errorf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody) } return nil } // Push a local image to the registry func (r *Registry) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error { utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/json") req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/json", bytes.NewReader(jsonRaw)) if err != nil { return err } req.Header.Add("Content-type", "application/json") setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { return fmt.Errorf("Failed to upload metadata: %s", err) } defer res.Body.Close() if res.StatusCode == 401 && strings.HasPrefix(registry, "http://") { return utils.NewHTTPRequestError("HTTP code 401, Docker will not send auth headers over HTTP.", res) } if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res) } var jsonBody map[string]string if err := json.Unmarshal(errBody, &jsonBody); err != nil { errBody = []byte(err.Error()) } else if jsonBody["error"] == "Image already exists" { return ErrAlreadyExists } return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody), res) } return nil } func (r *Registry) PushImageLayerRegistry(imgID string, layer io.Reader, registry string, token []string, jsonRaw []byte) (checksum string, checksumPayload string, err error) { utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgID+"/layer") tarsumLayer := &utils.TarSum{Reader: layer} h := sha256.New() h.Write(jsonRaw) h.Write([]byte{'\n'}) checksumLayer := &utils.CheckSum{Reader: tarsumLayer, Hash: h} req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgID+"/layer", checksumLayer) if err != nil { return "", "", err } req.ContentLength = -1 req.TransferEncoding = []string{"chunked"} setTokenAuth(req, token) res, err := r.client.Do(req) if err != nil { return "", "", fmt.Errorf("Failed to upload layer: %s", err) } if rc, ok := layer.(io.Closer); ok { if err := rc.Close(); err != nil { return "", "", err } } defer res.Body.Close() if res.StatusCode != 200 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return "", "", utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res) } return "", "", utils.NewHTTPRequestError(fmt.Sprintf("Received HTTP code %d while uploading layer: %s", res.StatusCode, errBody), res) } checksumPayload = "sha256:" + checksumLayer.Sum() return tarsumLayer.Sum(jsonRaw), checksumPayload, nil } // push a tag on the registry. // Remote has the format '/ func (r *Registry) PushRegistryTag(remote, revision, tag, registry string, token []string) error { // "jsonify" the string revision = "\"" + revision + "\"" path := fmt.Sprintf("repositories/%s/tags/%s", remote, tag) req, err := r.reqFactory.NewRequest("PUT", registry+path, strings.NewReader(revision)) if err != nil { return err } req.Header.Add("Content-type", "application/json") setTokenAuth(req, token) req.ContentLength = int64(len(revision)) res, err := r.client.Do(req) if err != nil { return err } res.Body.Close() if res.StatusCode != 200 && res.StatusCode != 201 { return utils.NewHTTPRequestError(fmt.Sprintf("Internal server error: %d trying to push tag %s on %s", res.StatusCode, tag, remote), res) } return nil } func (r *Registry) PushImageJSONIndex(remote string, imgList []*ImgData, validate bool, regs []string) (*RepositoryData, error) { cleanImgList := []*ImgData{} indexEp := r.indexEndpoint if validate { for _, elem := range imgList { if elem.Checksum != "" { cleanImgList = append(cleanImgList, elem) } } } else { cleanImgList = imgList } imgListJSON, err := json.Marshal(cleanImgList) if err != nil { return nil, err } var suffix string if validate { suffix = "images" } u := fmt.Sprintf("%srepositories/%s/%s", indexEp, remote, suffix) utils.Debugf("[registry] PUT %s", u) utils.Debugf("Image list pushed to index:\n%s", imgListJSON) req, err := r.reqFactory.NewRequest("PUT", u, bytes.NewReader(imgListJSON)) if err != nil { return nil, err } req.Header.Add("Content-type", "application/json") req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) req.ContentLength = int64(len(imgListJSON)) req.Header.Set("X-Docker-Token", "true") if validate { req.Header["X-Docker-Endpoints"] = regs } res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() // Redirect if necessary for res.StatusCode >= 300 && res.StatusCode < 400 { utils.Debugf("Redirected to %s", res.Header.Get("Location")) req, err = r.reqFactory.NewRequest("PUT", res.Header.Get("Location"), bytes.NewReader(imgListJSON)) if err != nil { return nil, err } req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) req.ContentLength = int64(len(imgListJSON)) req.Header.Set("X-Docker-Token", "true") if validate { req.Header["X-Docker-Endpoints"] = regs } res, err = r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() } var tokens, endpoints []string if !validate { if res.StatusCode != 200 && res.StatusCode != 201 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push repository %s: %s", res.StatusCode, remote, errBody), res) } if res.Header.Get("X-Docker-Token") != "" { tokens = res.Header["X-Docker-Token"] utils.Debugf("Auth token: %v", tokens) } else { return nil, fmt.Errorf("Index response didn't contain an access token") } if res.Header.Get("X-Docker-Endpoints") != "" { endpoints, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], indexEp) if err != nil { return nil, err } } else { return nil, fmt.Errorf("Index response didn't contain any endpoints") } } if validate { if res.StatusCode != 204 { errBody, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } return nil, utils.NewHTTPRequestError(fmt.Sprintf("Error: Status %d trying to push checksums %s: %s", res.StatusCode, remote, errBody), res) } } return &RepositoryData{ Tokens: tokens, Endpoints: endpoints, }, nil } func (r *Registry) SearchRepositories(term string) (*SearchResults, error) { utils.Debugf("Index server: %s", r.indexEndpoint) u := r.indexEndpoint + "search?q=" + url.QueryEscape(term) req, err := r.reqFactory.NewRequest("GET", u, nil) if err != nil { return nil, err } if r.authConfig != nil && len(r.authConfig.Username) > 0 { req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password) } req.Header.Set("X-Docker-Token", "true") res, err := r.client.Do(req) if err != nil { return nil, err } defer res.Body.Close() if res.StatusCode != 200 { return nil, utils.NewHTTPRequestError(fmt.Sprintf("Unexepected status code %d", res.StatusCode), res) } rawData, err := ioutil.ReadAll(res.Body) if err != nil { return nil, err } result := new(SearchResults) err = json.Unmarshal(rawData, result) return result, err } func (r *Registry) GetAuthConfig(withPasswd bool) *AuthConfig { password := "" if withPasswd { password = r.authConfig.Password } return &AuthConfig{ Username: r.authConfig.Username, Password: password, Email: r.authConfig.Email, } } type SearchResult struct { StarCount int `json:"star_count"` IsOfficial bool `json:"is_official"` Name string `json:"name"` IsTrusted bool `json:"is_trusted"` Description string `json:"description"` } type SearchResults struct { Query string `json:"query"` NumResults int `json:"num_results"` Results []SearchResult `json:"results"` } type RepositoryData struct { ImgList map[string]*ImgData Endpoints []string Tokens []string } type ImgData struct { ID string `json:"id"` Checksum string `json:"checksum,omitempty"` ChecksumPayload string `json:"-"` Tag string `json:",omitempty"` } type RegistryInfo struct { Version string `json:"version"` Standalone bool `json:"standalone"` } type Registry struct { client *http.Client authConfig *AuthConfig reqFactory *utils.HTTPRequestFactory indexEndpoint string } func NewRegistry(authConfig *AuthConfig, factory *utils.HTTPRequestFactory, indexEndpoint string) (r *Registry, err error) { httpDial := func(proto string, addr string) (net.Conn, error) { conn, err := net.Dial(proto, addr) if err != nil { return nil, err } conn = utils.NewTimeoutConn(conn, time.Duration(1)*time.Minute) return conn, nil } httpTransport := &http.Transport{ Dial: httpDial, DisableKeepAlives: true, Proxy: http.ProxyFromEnvironment, } r = &Registry{ authConfig: authConfig, client: &http.Client{ Transport: httpTransport, }, indexEndpoint: indexEndpoint, } r.client.Jar, err = cookiejar.New(nil) if err != nil { return nil, err } // If we're working with a standalone private registry over HTTPS, send Basic Auth headers // alongside our requests. if indexEndpoint != IndexServerAddress() && strings.HasPrefix(indexEndpoint, "https://") { info, err := pingRegistryEndpoint(indexEndpoint) if err != nil { return nil, err } if info.Standalone { utils.Debugf("Endpoint %s is eligible for private registry registry. Enabling decorator.", indexEndpoint) dec := utils.NewHTTPAuthDecorator(authConfig.Username, authConfig.Password) factory.AddDecorator(dec) } } r.reqFactory = factory return r, nil } func HTTPRequestFactory(metaHeaders map[string][]string) *utils.HTTPRequestFactory { // FIXME: this replicates the 'info' job. httpVersion := make([]utils.VersionInfo, 0, 4) httpVersion = append(httpVersion, &simpleVersionInfo{"docker", dockerversion.VERSION}) httpVersion = append(httpVersion, &simpleVersionInfo{"go", runtime.Version()}) httpVersion = append(httpVersion, &simpleVersionInfo{"git-commit", dockerversion.GITCOMMIT}) if kernelVersion, err := utils.GetKernelVersion(); err == nil { httpVersion = append(httpVersion, &simpleVersionInfo{"kernel", kernelVersion.String()}) } httpVersion = append(httpVersion, &simpleVersionInfo{"os", runtime.GOOS}) httpVersion = append(httpVersion, &simpleVersionInfo{"arch", runtime.GOARCH}) ud := utils.NewHTTPUserAgentDecorator(httpVersion...) md := &utils.HTTPMetaHeadersDecorator{ Headers: metaHeaders, } factory := utils.NewHTTPRequestFactory(ud, md) return factory } // simpleVersionInfo is a simple implementation of // the interface VersionInfo, which is used // to provide version information for some product, // component, etc. It stores the product name and the version // in string and returns them on calls to Name() and Version(). type simpleVersionInfo struct { name string version string } func (v *simpleVersionInfo) Name() string { return v.name } func (v *simpleVersionInfo) Version() string { return v.version }