612 lines
18 KiB
Go
612 lines
18 KiB
Go
package registry
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import (
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"bytes"
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"crypto/sha256"
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_ "crypto/sha512"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/http/cookiejar"
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"net/url"
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"strconv"
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"strings"
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"time"
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"github.com/docker/docker/pkg/httputils"
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"github.com/docker/docker/pkg/log"
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"github.com/docker/docker/pkg/tarsum"
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"github.com/docker/docker/utils"
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)
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type Session struct {
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authConfig *AuthConfig
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reqFactory *utils.HTTPRequestFactory
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indexEndpoint string
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jar *cookiejar.Jar
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timeout TimeoutType
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}
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func NewSession(authConfig *AuthConfig, factory *utils.HTTPRequestFactory, indexEndpoint string, timeout bool) (r *Session, err error) {
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r = &Session{
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authConfig: authConfig,
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indexEndpoint: indexEndpoint,
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}
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if timeout {
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r.timeout = ReceiveTimeout
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}
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r.jar, err = cookiejar.New(nil)
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if err != nil {
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return nil, err
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}
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// If we're working with a standalone private registry over HTTPS, send Basic Auth headers
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// alongside our requests.
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if indexEndpoint != IndexServerAddress() && strings.HasPrefix(indexEndpoint, "https://") {
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info, err := pingRegistryEndpoint(indexEndpoint)
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if err != nil {
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return nil, err
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}
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if info.Standalone {
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log.Debugf("Endpoint %s is eligible for private registry registry. Enabling decorator.", indexEndpoint)
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dec := utils.NewHTTPAuthDecorator(authConfig.Username, authConfig.Password)
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factory.AddDecorator(dec)
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}
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}
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r.reqFactory = factory
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return r, nil
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}
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func (r *Session) doRequest(req *http.Request) (*http.Response, *http.Client, error) {
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return doRequest(req, r.jar, r.timeout)
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}
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// Retrieve the history of a given image from the Registry.
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// Return a list of the parent's json (requested image included)
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func (r *Session) GetRemoteHistory(imgID, registry string, token []string) ([]string, error) {
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req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/ancestry", nil)
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if err != nil {
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return nil, err
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}
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setTokenAuth(req, token)
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res, _, err := r.doRequest(req)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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if res.StatusCode != 200 {
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if res.StatusCode == 401 {
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return nil, errLoginRequired
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}
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return nil, utils.NewHTTPRequestError(fmt.Sprintf("Server error: %d trying to fetch remote history for %s", res.StatusCode, imgID), res)
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}
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jsonString, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, fmt.Errorf("Error while reading the http response: %s", err)
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}
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log.Debugf("Ancestry: %s", jsonString)
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history := new([]string)
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if err := json.Unmarshal(jsonString, history); err != nil {
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return nil, err
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}
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return *history, nil
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}
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// Check if an image exists in the Registry
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// TODO: This method should return the errors instead of masking them and returning false
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func (r *Session) LookupRemoteImage(imgID, registry string, token []string) bool {
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req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil)
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if err != nil {
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log.Errorf("Error in LookupRemoteImage %s", err)
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return false
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}
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setTokenAuth(req, token)
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res, _, err := r.doRequest(req)
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if err != nil {
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log.Errorf("Error in LookupRemoteImage %s", err)
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return false
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}
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res.Body.Close()
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return res.StatusCode == 200
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}
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// Retrieve an image from the Registry.
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func (r *Session) GetRemoteImageJSON(imgID, registry string, token []string) ([]byte, int, error) {
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// Get the JSON
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req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/json", nil)
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if err != nil {
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return nil, -1, fmt.Errorf("Failed to download json: %s", err)
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}
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setTokenAuth(req, token)
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res, _, err := r.doRequest(req)
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if err != nil {
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return nil, -1, fmt.Errorf("Failed to download json: %s", err)
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}
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defer res.Body.Close()
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if res.StatusCode != 200 {
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return nil, -1, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res)
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}
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// if the size header is not present, then set it to '-1'
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imageSize := -1
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if hdr := res.Header.Get("X-Docker-Size"); hdr != "" {
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imageSize, err = strconv.Atoi(hdr)
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if err != nil {
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return nil, -1, err
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}
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}
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jsonString, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, -1, fmt.Errorf("Failed to parse downloaded json: %s (%s)", err, jsonString)
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}
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return jsonString, imageSize, nil
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}
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func (r *Session) GetRemoteImageLayer(imgID, registry string, token []string, imgSize int64) (io.ReadCloser, error) {
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var (
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retries = 5
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client *http.Client
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res *http.Response
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imageURL = fmt.Sprintf("%simages/%s/layer", registry, imgID)
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)
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req, err := r.reqFactory.NewRequest("GET", imageURL, nil)
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if err != nil {
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return nil, fmt.Errorf("Error while getting from the server: %s\n", err)
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}
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setTokenAuth(req, token)
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for i := 1; i <= retries; i++ {
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res, client, err = r.doRequest(req)
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if err != nil {
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res.Body.Close()
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if i == retries {
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return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)",
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res.StatusCode, imgID)
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}
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time.Sleep(time.Duration(i) * 5 * time.Second)
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continue
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}
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break
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}
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if res.StatusCode != 200 {
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res.Body.Close()
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return nil, fmt.Errorf("Server error: Status %d while fetching image layer (%s)",
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res.StatusCode, imgID)
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}
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if res.Header.Get("Accept-Ranges") == "bytes" && imgSize > 0 {
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log.Debugf("server supports resume")
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return httputils.ResumableRequestReaderWithInitialResponse(client, req, 5, imgSize, res), nil
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}
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log.Debugf("server doesn't support resume")
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return res.Body, nil
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}
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func (r *Session) GetRemoteTags(registries []string, repository string, token []string) (map[string]string, error) {
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if strings.Count(repository, "/") == 0 {
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// This will be removed once the Registry supports auto-resolution on
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// the "library" namespace
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repository = "library/" + repository
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}
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for _, host := range registries {
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endpoint := fmt.Sprintf("%srepositories/%s/tags", host, repository)
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req, err := r.reqFactory.NewRequest("GET", endpoint, nil)
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if err != nil {
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return nil, err
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}
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setTokenAuth(req, token)
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res, _, err := r.doRequest(req)
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if err != nil {
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return nil, err
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}
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log.Debugf("Got status code %d from %s", res.StatusCode, endpoint)
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defer res.Body.Close()
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if res.StatusCode != 200 && res.StatusCode != 404 {
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continue
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} else if res.StatusCode == 404 {
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return nil, fmt.Errorf("Repository not found")
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}
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result := make(map[string]string)
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rawJSON, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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if err := json.Unmarshal(rawJSON, &result); err != nil {
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return nil, err
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}
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return result, nil
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}
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return nil, fmt.Errorf("Could not reach any registry endpoint")
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}
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func buildEndpointsList(headers []string, indexEp string) ([]string, error) {
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var endpoints []string
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parsedUrl, err := url.Parse(indexEp)
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if err != nil {
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return nil, err
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}
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var urlScheme = parsedUrl.Scheme
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// The Registry's URL scheme has to match the Index'
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for _, ep := range headers {
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epList := strings.Split(ep, ",")
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for _, epListElement := range epList {
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endpoints = append(
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endpoints,
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fmt.Sprintf("%s://%s/v1/", urlScheme, strings.TrimSpace(epListElement)))
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}
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}
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return endpoints, nil
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}
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func (r *Session) GetRepositoryData(remote string) (*RepositoryData, error) {
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indexEp := r.indexEndpoint
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repositoryTarget := fmt.Sprintf("%srepositories/%s/images", indexEp, remote)
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log.Debugf("[registry] Calling GET %s", repositoryTarget)
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req, err := r.reqFactory.NewRequest("GET", repositoryTarget, nil)
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if err != nil {
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return nil, err
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}
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if r.authConfig != nil && len(r.authConfig.Username) > 0 {
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req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password)
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}
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req.Header.Set("X-Docker-Token", "true")
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res, _, err := r.doRequest(req)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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if res.StatusCode == 401 {
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return nil, errLoginRequired
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}
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// TODO: Right now we're ignoring checksums in the response body.
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// In the future, we need to use them to check image validity.
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if res.StatusCode != 200 {
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return nil, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code: %d", res.StatusCode), res)
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}
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var tokens []string
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if res.Header.Get("X-Docker-Token") != "" {
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tokens = res.Header["X-Docker-Token"]
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}
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var endpoints []string
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if res.Header.Get("X-Docker-Endpoints") != "" {
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endpoints, err = buildEndpointsList(res.Header["X-Docker-Endpoints"], indexEp)
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if err != nil {
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return nil, err
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}
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} else {
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// Assume the endpoint is on the same host
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u, err := url.Parse(indexEp)
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if err != nil {
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return nil, err
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}
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endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", u.Scheme, req.URL.Host))
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}
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checksumsJSON, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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remoteChecksums := []*ImgData{}
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if err := json.Unmarshal(checksumsJSON, &remoteChecksums); err != nil {
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return nil, err
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}
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// Forge a better object from the retrieved data
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imgsData := make(map[string]*ImgData)
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for _, elem := range remoteChecksums {
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imgsData[elem.ID] = elem
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}
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return &RepositoryData{
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ImgList: imgsData,
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Endpoints: endpoints,
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Tokens: tokens,
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}, nil
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}
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func (r *Session) PushImageChecksumRegistry(imgData *ImgData, registry string, token []string) error {
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log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/checksum")
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req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/checksum", nil)
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if err != nil {
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return err
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}
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setTokenAuth(req, token)
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req.Header.Set("X-Docker-Checksum", imgData.Checksum)
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req.Header.Set("X-Docker-Checksum-Payload", imgData.ChecksumPayload)
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res, _, err := r.doRequest(req)
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if err != nil {
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return fmt.Errorf("Failed to upload metadata: %s", err)
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}
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defer res.Body.Close()
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if len(res.Cookies()) > 0 {
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r.jar.SetCookies(req.URL, res.Cookies())
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}
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if res.StatusCode != 200 {
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errBody, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return fmt.Errorf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err)
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}
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var jsonBody map[string]string
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if err := json.Unmarshal(errBody, &jsonBody); err != nil {
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errBody = []byte(err.Error())
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} else if jsonBody["error"] == "Image already exists" {
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return ErrAlreadyExists
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}
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return fmt.Errorf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody)
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}
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return nil
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}
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// Push a local image to the registry
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func (r *Session) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error {
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log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgData.ID+"/json")
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req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgData.ID+"/json", bytes.NewReader(jsonRaw))
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if err != nil {
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return err
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}
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req.Header.Add("Content-type", "application/json")
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setTokenAuth(req, token)
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res, _, err := r.doRequest(req)
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if err != nil {
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return fmt.Errorf("Failed to upload metadata: %s", err)
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}
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defer res.Body.Close()
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if res.StatusCode == 401 && strings.HasPrefix(registry, "http://") {
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return utils.NewHTTPRequestError("HTTP code 401, Docker will not send auth headers over HTTP.", res)
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}
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if res.StatusCode != 200 {
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errBody, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res)
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}
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var jsonBody map[string]string
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if err := json.Unmarshal(errBody, &jsonBody); err != nil {
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errBody = []byte(err.Error())
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} else if jsonBody["error"] == "Image already exists" {
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return ErrAlreadyExists
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}
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return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody), res)
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}
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return nil
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}
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func (r *Session) PushImageLayerRegistry(imgID string, layer io.Reader, registry string, token []string, jsonRaw []byte) (checksum string, checksumPayload string, err error) {
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log.Debugf("[registry] Calling PUT %s", registry+"images/"+imgID+"/layer")
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tarsumLayer := &tarsum.TarSum{Reader: layer}
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h := sha256.New()
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h.Write(jsonRaw)
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h.Write([]byte{'\n'})
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checksumLayer := io.TeeReader(tarsumLayer, h)
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req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgID+"/layer", checksumLayer)
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if err != nil {
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return "", "", err
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}
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req.Header.Add("Content-Type", "application/octet-stream")
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req.ContentLength = -1
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req.TransferEncoding = []string{"chunked"}
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setTokenAuth(req, token)
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res, _, err := r.doRequest(req)
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if err != nil {
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return "", "", fmt.Errorf("Failed to upload layer: %s", err)
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}
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if rc, ok := layer.(io.Closer); ok {
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if err := rc.Close(); err != nil {
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return "", "", err
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}
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}
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defer res.Body.Close()
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if res.StatusCode != 200 {
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errBody, err := ioutil.ReadAll(res.Body)
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if err != nil {
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return "", "", utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata and error when trying to parse response body: %s", res.StatusCode, err), res)
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}
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return "", "", utils.NewHTTPRequestError(fmt.Sprintf("Received HTTP code %d while uploading layer: %s", res.StatusCode, errBody), res)
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}
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checksumPayload = "sha256:" + hex.EncodeToString(h.Sum(nil))
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return tarsumLayer.Sum(jsonRaw), checksumPayload, nil
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}
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// push a tag on the registry.
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// Remote has the format '<user>/<repo>
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func (r *Session) PushRegistryTag(remote, revision, tag, registry string, token []string) error {
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// "jsonify" the string
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revision = "\"" + revision + "\""
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path := fmt.Sprintf("repositories/%s/tags/%s", remote, tag)
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req, err := r.reqFactory.NewRequest("PUT", registry+path, strings.NewReader(revision))
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if err != nil {
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return err
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}
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req.Header.Add("Content-type", "application/json")
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setTokenAuth(req, token)
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req.ContentLength = int64(len(revision))
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res, _, err := r.doRequest(req)
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if err != nil {
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return err
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}
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res.Body.Close()
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if res.StatusCode != 200 && res.StatusCode != 201 {
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return utils.NewHTTPRequestError(fmt.Sprintf("Internal server error: %d trying to push tag %s on %s", res.StatusCode, tag, remote), res)
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}
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return nil
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}
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func (r *Session) PushImageJSONIndex(remote string, imgList []*ImgData, validate bool, regs []string) (*RepositoryData, error) {
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cleanImgList := []*ImgData{}
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indexEp := r.indexEndpoint
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if validate {
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for _, elem := range imgList {
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if elem.Checksum != "" {
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cleanImgList = append(cleanImgList, elem)
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}
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}
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} else {
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cleanImgList = imgList
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}
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imgListJSON, err := json.Marshal(cleanImgList)
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if err != nil {
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return nil, err
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}
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var suffix string
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if validate {
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suffix = "images"
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}
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u := fmt.Sprintf("%srepositories/%s/%s", indexEp, remote, suffix)
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log.Debugf("[registry] PUT %s", u)
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log.Debugf("Image list pushed to index:\n%s", imgListJSON)
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req, err := r.reqFactory.NewRequest("PUT", u, bytes.NewReader(imgListJSON))
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if err != nil {
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return nil, err
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}
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req.Header.Add("Content-type", "application/json")
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req.SetBasicAuth(r.authConfig.Username, r.authConfig.Password)
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req.ContentLength = int64(len(imgListJSON))
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req.Header.Set("X-Docker-Token", "true")
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if validate {
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req.Header["X-Docker-Endpoints"] = regs
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}
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res, _, err := r.doRequest(req)
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if err != nil {
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return nil, err
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|
}
|
|
defer res.Body.Close()
|
|
|
|
// Redirect if necessary
|
|
for res.StatusCode >= 300 && res.StatusCode < 400 {
|
|
log.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.doRequest(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"]
|
|
log.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 *Session) SearchRepositories(term string) (*SearchResults, error) {
|
|
log.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.doRequest(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 *Session) GetAuthConfig(withPasswd bool) *AuthConfig {
|
|
password := ""
|
|
if withPasswd {
|
|
password = r.authConfig.Password
|
|
}
|
|
return &AuthConfig{
|
|
Username: r.authConfig.Username,
|
|
Password: password,
|
|
Email: r.authConfig.Email,
|
|
}
|
|
}
|
|
|
|
func setTokenAuth(req *http.Request, token []string) {
|
|
if req.Header.Get("Authorization") == "" { // Don't override
|
|
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
|
|
}
|
|
}
|