docker/registry/registry.go

672 строки
20 KiB
Go
Исходник Обычный вид История

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package registry
import (
"bytes"
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"encoding/json"
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"errors"
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"fmt"
"github.com/dotcloud/docker/auth"
"github.com/dotcloud/docker/utils"
"io"
"io/ioutil"
"net"
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"net/http"
"net/http/cookiejar"
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"net/url"
"regexp"
"strconv"
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"strings"
"time"
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)
var (
ErrAlreadyExists = errors.New("Image already exists")
ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")")
ErrLoginRequired = errors.New("Authentication is required.")
)
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func pingRegistryEndpoint(endpoint string) error {
if endpoint == auth.IndexServerAddress() {
// Skip the check, we now this one is valid
// (and we never want to fallback to http in case of error)
return 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}
client := &http.Client{Transport: httpTransport}
resp, err := client.Get(endpoint + "_ping")
if err != nil {
return err
}
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defer resp.Body.Close()
if resp.Header.Get("X-Docker-Registry-Version") == "" {
return errors.New("This does not look like a Registry server (\"X-Docker-Registry-Version\" header not found in the response)")
}
return 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 endpoint + 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 !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 auth.IndexServerAddress(), reposName, err
}
if len(nameParts) < 2 {
// There is a dot in repos name (and no registry address)
// Is it a Registry address without repos name?
return "", "", ErrInvalidRepositoryName
}
hostname := nameParts[0]
reposName = nameParts[1]
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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
}
endpoint, err := ExpandAndVerifyRegistryUrl(hostname)
if err != nil {
return "", "", err
}
return endpoint, reposName, err
}
// 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 doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) {
for _, cookie := range c.Jar.Cookies(req.URL) {
req.AddCookie(cookie)
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}
res, err := c.Do(req)
if err != nil {
return nil, err
}
if len(res.Cookies()) > 0 {
c.Jar.SetCookies(req.URL, res.Cookies())
}
return res, err
}
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// 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) {
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req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/ancestry", nil)
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if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := doWithCookies(r.client, req)
if err != nil {
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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)
}
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jsonString, err := ioutil.ReadAll(res.Body)
if err != nil {
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return nil, fmt.Errorf("Error while reading the http response: %s", err)
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}
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
func (r *Registry) 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 {
return false
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := doWithCookies(r.client, req)
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if err != nil {
return false
}
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res.Body.Close()
return res.StatusCode == 200
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}
// Retrieve an image from the Registry.
func (r *Registry) 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 {
return nil, -1, fmt.Errorf("Failed to download json: %s", err)
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}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := doWithCookies(r.client, req)
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if err != nil {
return nil, -1, fmt.Errorf("Failed to download json: %s", err)
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}
defer res.Body.Close()
if res.StatusCode != 200 {
return nil, -1, utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d", res.StatusCode), res)
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}
imageSize, err := strconv.Atoi(res.Header.Get("X-Docker-Size"))
if err != nil {
return nil, -1, err
}
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jsonString, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, -1, fmt.Errorf("Failed to parse downloaded json: %s (%s)", err, jsonString)
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}
return jsonString, imageSize, nil
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}
func (r *Registry) GetRemoteImageLayer(imgID, registry string, token []string) (io.ReadCloser, error) {
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req, err := r.reqFactory.NewRequest("GET", registry+"images/"+imgID+"/layer", nil)
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if err != nil {
return nil, fmt.Errorf("Error while getting from the server: %s\n", err)
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}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := doWithCookies(r.client, req)
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if err != nil {
return nil, err
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}
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
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}
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func (r *Registry) GetRemoteTags(registries []string, repository string, token []string) (map[string]string, error) {
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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)
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req, err := r.reqFactory.NewRequest("GET", endpoint, nil)
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if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := doWithCookies(r.client, req)
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if err != nil {
return nil, err
}
utils.Debugf("Got status code %d from %s", res.StatusCode, endpoint)
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defer res.Body.Close()
if res.StatusCode != 200 && res.StatusCode != 404 {
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continue
} else if res.StatusCode == 404 {
return nil, fmt.Errorf("Repository not found")
}
result := make(map[string]string)
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rawJSON, err := ioutil.ReadAll(res.Body)
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if err != nil {
return nil, err
}
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if err := json.Unmarshal(rawJSON, &result); err != nil {
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return nil, err
}
return result, nil
}
return nil, fmt.Errorf("Could not reach any registry endpoint")
}
func (r *Registry) GetRepositoryData(indexEp, remote string) (*RepositoryData, error) {
repositoryTarget := fmt.Sprintf("%srepositories/%s/images", indexEp, remote)
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utils.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 {
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")
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res, err := r.client.Do(req)
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if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode == 401 {
return nil, ErrLoginRequired
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}
// 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)
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}
var tokens []string
if res.Header.Get("X-Docker-Token") != "" {
tokens = res.Header["X-Docker-Token"]
}
var endpoints []string
var urlScheme = indexEp[:strings.Index(indexEp, ":")]
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if res.Header.Get("X-Docker-Endpoints") != "" {
// The Registry's URL scheme has to match the Index'
for _, ep := range res.Header["X-Docker-Endpoints"] {
endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, ep))
}
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} else {
return nil, fmt.Errorf("Index response didn't contain any endpoints")
}
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checksumsJSON, err := ioutil.ReadAll(res.Body)
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if err != nil {
return nil, err
}
remoteChecksums := []*ImgData{}
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if err := json.Unmarshal(checksumsJSON, &remoteChecksums); err != nil {
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return nil, err
}
// Forge a better object from the retrieved data
imgsData := make(map[string]*ImgData)
for _, elem := range remoteChecksums {
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imgsData[elem.ID] = elem
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}
return &RepositoryData{
ImgList: imgsData,
Endpoints: endpoints,
Tokens: tokens,
}, nil
}
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func (r *Registry) PushImageChecksumRegistry(imgData *ImgData, registry string, token []string) error {
utils.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 {
return err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
req.Header.Set("X-Docker-Checksum", imgData.Checksum)
res, err := doWithCookies(r.client, 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
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func (r *Registry) PushImageJSONRegistry(imgData *ImgData, jsonRaw []byte, registry string, token []string) error {
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utils.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))
if err != nil {
return err
}
req.Header.Add("Content-type", "application/json")
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
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res, err := doWithCookies(r.client, req)
if err != nil {
return fmt.Errorf("Failed to upload metadata: %s", err)
}
defer res.Body.Close()
if res.StatusCode != 200 {
errBody, err := ioutil.ReadAll(res.Body)
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)
}
var jsonBody map[string]string
if err := json.Unmarshal(errBody, &jsonBody); err != nil {
errBody = []byte(err.Error())
} else if jsonBody["error"] == "Image already exists" {
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return ErrAlreadyExists
}
return utils.NewHTTPRequestError(fmt.Sprintf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody), res)
}
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return nil
}
func (r *Registry) PushImageLayerRegistry(imgID string, layer io.Reader, registry string, token []string, jsonRaw []byte) (checksum string, err error) {
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utils.Debugf("[registry] Calling PUT %s", registry+"images/"+imgID+"/layer")
tarsumLayer := &utils.TarSum{Reader: layer}
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req, err := r.reqFactory.NewRequest("PUT", registry+"images/"+imgID+"/layer", tarsumLayer)
if err != nil {
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return "", err
}
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req.ContentLength = -1
req.TransferEncoding = []string{"chunked"}
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
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res, err := doWithCookies(r.client, req)
if err != nil {
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return "", fmt.Errorf("Failed to upload layer: %s", err)
}
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defer res.Body.Close()
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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)
}
return tarsumLayer.Sum(jsonRaw), nil
}
// push a tag on the registry.
// Remote has the format '<user>/<repo>
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func (r *Registry) PushRegistryTag(remote, revision, tag, registry string, token []string) error {
// "jsonify" the string
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))
if err != nil {
return err
}
req.Header.Add("Content-type", "application/json")
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
req.ContentLength = int64(len(revision))
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res, err := doWithCookies(r.client, 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(indexEp, remote string, imgList []*ImgData, validate bool, regs []string) (*RepositoryData, error) {
cleanImgList := []*ImgData{}
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
}
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var suffix string
if validate {
suffix = "images"
}
u := fmt.Sprintf("%srepositories/%s/%s", indexEp, remote, suffix)
utils.Debugf("[registry] PUT %s", u)
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utils.Debugf("Image list pushed to index:\n%s", imgListJSON)
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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)
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req.ContentLength = int64(len(imgListJSON))
req.Header.Set("X-Docker-Token", "true")
if validate {
req.Header["X-Docker-Endpoints"] = regs
}
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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 {
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utils.Debugf("Redirected to %s", res.Header.Get("Location"))
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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)
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req.ContentLength = int64(len(imgListJSON))
req.Header.Set("X-Docker-Token", "true")
if validate {
req.Header["X-Docker-Endpoints"] = regs
}
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res, err = r.client.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
}
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var tokens, endpoints []string
var urlScheme = indexEp[:strings.Index(indexEp, ":")]
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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)
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}
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")
}
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if res.Header.Get("X-Docker-Endpoints") != "" {
// The Registry's URL scheme has to match the Index'
for _, ep := range res.Header["X-Docker-Endpoints"] {
endpoints = append(endpoints, fmt.Sprintf("%s://%s/v1/", urlScheme, ep))
}
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} else {
return nil, fmt.Errorf("Index response didn't contain any endpoints")
}
}
if validate {
if res.StatusCode != 204 {
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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
}
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func (r *Registry) SearchRepositories(term string) (*SearchResults, error) {
u := auth.IndexServerAddress() + "search?q=" + url.QueryEscape(term)
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req, err := r.reqFactory.NewRequest("GET", u, nil)
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if err != nil {
return nil, err
}
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res, err := r.client.Do(req)
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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)
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}
rawData, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
result := new(SearchResults)
err = json.Unmarshal(rawData, result)
return result, err
}
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func (r *Registry) GetAuthConfig(withPasswd bool) *auth.AuthConfig {
password := ""
if withPasswd {
password = r.authConfig.Password
}
return &auth.AuthConfig{
Username: r.authConfig.Username,
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Password: password,
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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"`
}
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type SearchResults struct {
Query string `json:"query"`
NumResults int `json:"num_results"`
Results []SearchResult `json:"results"`
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}
type RepositoryData struct {
ImgList map[string]*ImgData
Endpoints []string
Tokens []string
}
type ImgData struct {
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ID string `json:"id"`
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Checksum string `json:"checksum,omitempty"`
Tag string `json:",omitempty"`
}
type Registry struct {
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client *http.Client
authConfig *auth.AuthConfig
reqFactory *utils.HTTPRequestFactory
}
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func NewRegistry(root string, authConfig *auth.AuthConfig, factory *utils.HTTPRequestFactory) (r *Registry, err error) {
httpTransport := &http.Transport{
DisableKeepAlives: true,
Proxy: http.ProxyFromEnvironment,
}
r = &Registry{
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authConfig: authConfig,
client: &http.Client{
Transport: httpTransport,
},
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}
r.client.Jar, err = cookiejar.New(nil)
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if err != nil {
return nil, err
}
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r.reqFactory = factory
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return r, nil
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}