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moby--moby/registry.go
Guillaume J. Charmes a2b5196061 Merge pull request #543 from dotcloud/pull-official-tag-fix
- Registry: Fix pull for official images with specific tag
2013-05-07 10:56:37 -07:00

676 lines
19 KiB
Go

package docker
import (
"bytes"
"encoding/json"
"fmt"
"github.com/dotcloud/docker/auth"
"github.com/shin-/cookiejar"
"io"
"io/ioutil"
"net/http"
"net/url"
"path"
"strings"
)
//FIXME: Set the endpoint in a conf file or via commandline
const INDEX_ENDPOINT = auth.INDEX_SERVER + "/v1"
// Build an Image object from raw json data
func NewImgJson(src []byte) (*Image, error) {
ret := &Image{}
Debugf("Json string: {%s}\n", src)
// FIXME: Is there a cleaner way to "purify" the input json?
if err := json.Unmarshal(src, ret); err != nil {
return nil, err
}
return ret, nil
}
func doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) {
for _, cookie := range c.Jar.Cookies(req.URL) {
req.AddCookie(cookie)
}
return c.Do(req)
}
// Retrieve the history of a given image from the Registry.
// Return a list of the parent's json (requested image included)
func (graph *Graph) getRemoteHistory(imgId, registry string, token []string) ([]string, error) {
client := graph.getHttpClient()
req, err := http.NewRequest("GET", registry+"/images/"+imgId+"/ancestry", nil)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := client.Do(req)
if err != nil || res.StatusCode != 200 {
if res != nil {
return nil, fmt.Errorf("Internal server error: %d trying to fetch remote history for %s", res.StatusCode, imgId)
}
return nil, err
}
defer res.Body.Close()
jsonString, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, fmt.Errorf("Error while reading the http response: %s\n", err)
}
Debugf("Ancestry: %s", jsonString)
history := new([]string)
if err := json.Unmarshal(jsonString, history); err != nil {
return nil, err
}
return *history, nil
}
func (graph *Graph) getHttpClient() *http.Client {
if graph.httpClient == nil {
graph.httpClient = &http.Client{}
graph.httpClient.Jar = cookiejar.NewCookieJar()
}
return graph.httpClient
}
// Check if an image exists in the Registry
func (graph *Graph) LookupRemoteImage(imgId, registry string, authConfig *auth.AuthConfig) bool {
rt := &http.Transport{Proxy: http.ProxyFromEnvironment}
req, err := http.NewRequest("GET", registry+"/images/"+imgId+"/json", nil)
if err != nil {
return false
}
req.SetBasicAuth(authConfig.Username, authConfig.Password)
res, err := rt.RoundTrip(req)
return err == nil && res.StatusCode == 307
}
func (graph *Graph) getImagesInRepository(repository string, authConfig *auth.AuthConfig) ([]map[string]string, error) {
u := INDEX_ENDPOINT + "/repositories/" + repository + "/images"
req, err := http.NewRequest("GET", u, nil)
if err != nil {
return nil, err
}
if authConfig != nil && len(authConfig.Username) > 0 {
req.SetBasicAuth(authConfig.Username, authConfig.Password)
}
res, err := graph.getHttpClient().Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
// Repository doesn't exist yet
if res.StatusCode == 404 {
return nil, nil
}
jsonData, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
imageList := []map[string]string{}
err = json.Unmarshal(jsonData, &imageList)
if err != nil {
Debugf("Body: %s (%s)\n", res.Body, u)
return nil, err
}
return imageList, nil
}
// Retrieve an image from the Registry.
// Returns the Image object as well as the layer as an Archive (io.Reader)
func (graph *Graph) getRemoteImage(stdout io.Writer, imgId, registry string, token []string) (*Image, Archive, error) {
client := graph.getHttpClient()
fmt.Fprintf(stdout, "Pulling %s metadata\r\n", imgId)
// Get the Json
req, err := http.NewRequest("GET", registry+"/images/"+imgId+"/json", nil)
if err != nil {
return nil, nil, fmt.Errorf("Failed to download json: %s", err)
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := client.Do(req)
if err != nil {
return nil, nil, fmt.Errorf("Failed to download json: %s", err)
}
if res.StatusCode != 200 {
return nil, nil, fmt.Errorf("HTTP code %d", res.StatusCode)
}
defer res.Body.Close()
jsonString, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, nil, fmt.Errorf("Failed to download json: %s", err)
}
img, err := NewImgJson(jsonString)
if err != nil {
return nil, nil, fmt.Errorf("Failed to parse json: %s", err)
}
img.Id = imgId
// Get the layer
fmt.Fprintf(stdout, "Pulling %s fs layer\r\n", imgId)
req, err = http.NewRequest("GET", registry+"/images/"+imgId+"/layer", nil)
if err != nil {
return nil, nil, fmt.Errorf("Error while getting from the server: %s\n", err)
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err = client.Do(req)
if err != nil {
return nil, nil, err
}
return img, ProgressReader(res.Body, int(res.ContentLength), stdout, "Downloading %v/%v (%v)"), nil
}
func (graph *Graph) getRemoteTags(stdout io.Writer, registries []string, repository string, token []string) (map[string]string, error) {
client := graph.getHttpClient()
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("https://%s/v1/repositories/%s/tags", host, repository)
req, err := http.NewRequest("GET", endpoint, nil)
if err != nil {
return nil, err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := client.Do(req)
defer res.Body.Close()
Debugf("Got status code %d from %s", res.StatusCode, endpoint)
if err != nil || (res.StatusCode != 200 && res.StatusCode != 404) {
continue
} else if res.StatusCode == 404 {
return nil, fmt.Errorf("Repository not found")
}
result := new(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 (graph *Graph) getImageForTag(stdout io.Writer, tag, remote, registry string, token []string) (string, error) {
client := graph.getHttpClient()
if !strings.Contains(remote, "/") {
remote = "library/" + remote
}
registryEndpoint := "https://" + registry + "/v1"
repositoryTarget := registryEndpoint + "/repositories/" + remote + "/tags/" + tag
req, err := http.NewRequest("GET", repositoryTarget, nil)
if err != nil {
return "", err
}
req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
res, err := client.Do(req)
if err != nil {
return "", fmt.Errorf("Error while retrieving repository info: %v", err)
}
defer res.Body.Close()
if res.StatusCode == 403 {
return "", fmt.Errorf("You aren't authorized to access this resource")
} else if res.StatusCode != 200 {
return "", fmt.Errorf("HTTP code: %d", res.StatusCode)
}
var imgId string
rawJson, err := ioutil.ReadAll(res.Body)
if err != nil {
return "", err
}
if err = json.Unmarshal(rawJson, &imgId); err != nil {
return "", err
}
return imgId, nil
}
func (graph *Graph) PullImage(stdout io.Writer, imgId, registry string, token []string) error {
history, err := graph.getRemoteHistory(imgId, registry, token)
if err != nil {
return err
}
// FIXME: Try to stream the images?
// FIXME: Launch the getRemoteImage() in goroutines
for _, id := range history {
if !graph.Exists(id) {
img, layer, err := graph.getRemoteImage(stdout, id, registry, token)
if err != nil {
// FIXME: Keep goging in case of error?
return err
}
if err = graph.Register(layer, img); err != nil {
return err
}
}
}
return nil
}
func (graph *Graph) PullRepository(stdout io.Writer, remote, askedTag string, repositories *TagStore, authConfig *auth.AuthConfig) error {
client := graph.getHttpClient()
fmt.Fprintf(stdout, "Pulling repository %s from %s\r\n", remote, INDEX_ENDPOINT)
repositoryTarget := INDEX_ENDPOINT + "/repositories/" + remote + "/images"
req, err := http.NewRequest("GET", repositoryTarget, nil)
if err != nil {
return err
}
if authConfig != nil && len(authConfig.Username) > 0 {
req.SetBasicAuth(authConfig.Username, authConfig.Password)
}
req.Header.Set("X-Docker-Token", "true")
res, err := client.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode == 401 {
return fmt.Errorf("Please login first (HTTP code %d)", res.StatusCode)
}
// 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 fmt.Errorf("HTTP code: %d", res.StatusCode)
}
var token, endpoints []string
if res.Header.Get("X-Docker-Token") != "" {
token = res.Header["X-Docker-Token"]
}
if res.Header.Get("X-Docker-Endpoints") != "" {
endpoints = res.Header["X-Docker-Endpoints"]
} else {
return fmt.Errorf("Index response didn't contain any endpoints")
}
var tagsList map[string]string
if askedTag == "" {
tagsList, err = graph.getRemoteTags(stdout, endpoints, remote, token)
if err != nil {
return err
}
} else {
tagsList = map[string]string{askedTag: ""}
}
for askedTag, imgId := range tagsList {
fmt.Fprintf(stdout, "Resolving tag \"%s:%s\" from %s\n", remote, askedTag, endpoints)
success := false
for _, registry := range endpoints {
if imgId == "" {
imgId, err = graph.getImageForTag(stdout, askedTag, remote, registry, token)
if err != nil {
fmt.Fprintf(stdout, "Error while retrieving image for tag: %v (%v) ; "+
"checking next endpoint", askedTag, err)
continue
}
}
if err := graph.PullImage(stdout, imgId, "https://"+registry+"/v1", token); err != nil {
return err
}
if err = repositories.Set(remote, askedTag, imgId, true); err != nil {
return err
}
success = true
}
if !success {
return fmt.Errorf("Could not find repository on any of the indexed registries.")
}
}
if err = repositories.Save(); err != nil {
return err
}
return nil
}
func pushImageRec(graph *Graph, stdout io.Writer, img *Image, registry string, token []string) error {
if parent, err := img.GetParent(); err != nil {
return err
} else if parent != nil {
if err := pushImageRec(graph, stdout, parent, registry, token); err != nil {
return err
}
}
client := graph.getHttpClient()
jsonRaw, err := ioutil.ReadFile(path.Join(graph.Root, img.Id, "json"))
if err != nil {
return fmt.Errorf("Error while retreiving the path for {%s}: %s", img.Id, err)
}
fmt.Fprintf(stdout, "Pushing %s metadata\r\n", img.Id)
// FIXME: try json with UTF8
jsonData := strings.NewReader(string(jsonRaw))
req, err := http.NewRequest("PUT", registry+"/images/"+img.Id+"/json", jsonData)
if err != nil {
return err
}
req.Header.Add("Content-type", "application/json")
req.Header.Set("Authorization", "Token "+strings.Join(token, ","))
checksum, err := img.Checksum()
if err != nil {
return fmt.Errorf("Error while retrieving checksum for %s: %v", img.Id, err)
}
req.Header.Set("X-Docker-Checksum", checksum)
res, err := doWithCookies(client, req)
if err != nil {
return fmt.Errorf("Failed to upload metadata: %s", err)
}
defer res.Body.Close()
if len(res.Cookies()) > 0 {
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: %v", 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" {
fmt.Fprintf(stdout, "Image %v already uploaded ; skipping\n", img.Id)
return nil
}
return fmt.Errorf("HTTP code %d while uploading metadata: %s", res.StatusCode, errBody)
}
fmt.Fprintf(stdout, "Pushing %s fs layer\r\n", img.Id)
layerData, err := graph.TempLayerArchive(img.Id, Xz, stdout)
if err != nil {
return fmt.Errorf("Failed to generate layer archive: %s", err)
}
req3, err := http.NewRequest("PUT", registry+"/images/"+img.Id+"/layer",
ProgressReader(layerData, -1, stdout, ""))
if err != nil {
return err
}
req3.ContentLength = -1
req3.TransferEncoding = []string{"chunked"}
req3.Header.Set("Authorization", "Token "+strings.Join(token, ","))
res3, err := doWithCookies(client, req3)
if err != nil {
return fmt.Errorf("Failed to upload layer: %s", err)
}
res3.Body.Close()
if res3.StatusCode != 200 {
return fmt.Errorf("Received HTTP code %d while uploading layer", res3.StatusCode)
}
return nil
}
// Push a local image to the registry with its history if needed
func (graph *Graph) PushImage(stdout io.Writer, imgOrig *Image, registry string, token []string) error {
registry = "https://" + registry + "/v1"
return pushImageRec(graph, stdout, imgOrig, registry, token)
}
// push a tag on the registry.
// Remote has the format '<user>/<repo>
func (graph *Graph) pushTag(remote, revision, tag, registry string, token []string) error {
// "jsonify" the string
revision = "\"" + revision + "\""
registry = "https://" + registry + "/v1"
Debugf("Pushing tags for rev [%s] on {%s}\n", revision, registry+"/users/"+remote+"/"+tag)
client := graph.getHttpClient()
req, err := http.NewRequest("PUT", registry+"/repositories/"+remote+"/tags/"+tag, 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))
res, err := doWithCookies(client, req)
if err != nil {
return err
}
res.Body.Close()
if res.StatusCode != 200 && res.StatusCode != 201 {
return fmt.Errorf("Internal server error: %d trying to push tag %s on %s", res.StatusCode, tag, remote)
}
return nil
}
// FIXME: this should really be PushTag
func (graph *Graph) pushPrimitive(stdout io.Writer, remote, tag, imgId, registry string, token []string) error {
// Check if the local impage exists
img, err := graph.Get(imgId)
if err != nil {
fmt.Fprintf(stdout, "Skipping tag %s:%s: %s does not exist\r\n", remote, tag, imgId)
return nil
}
fmt.Fprintf(stdout, "Pushing image %s:%s\r\n", remote, tag)
// Push the image
if err = graph.PushImage(stdout, img, registry, token); err != nil {
return err
}
fmt.Fprintf(stdout, "Registering tag %s:%s\r\n", remote, tag)
// And then the tag
if err = graph.pushTag(remote, imgId, tag, registry, token); err != nil {
return err
}
return nil
}
// Push a repository to the registry.
// Remote has the format '<user>/<repo>
func (graph *Graph) PushRepository(stdout io.Writer, remote string, localRepo Repository, authConfig *auth.AuthConfig) error {
client := graph.getHttpClient()
checksums, err := graph.Checksums(stdout, localRepo)
if err != nil {
return err
}
imgList := make([]map[string]string, len(checksums))
checksums2 := make([]map[string]string, len(checksums))
uploadedImages, err := graph.getImagesInRepository(remote, authConfig)
if err != nil {
return fmt.Errorf("Error occured while fetching the list: %s", err)
}
// Filter list to only send images/checksums not already uploaded
i := 0
for _, obj := range checksums {
found := false
for _, uploadedImg := range uploadedImages {
if obj["id"] == uploadedImg["id"] && uploadedImg["checksum"] != "" {
found = true
break
}
}
if !found {
imgList[i] = map[string]string{"id": obj["id"]}
checksums2[i] = obj
i += 1
}
}
checksums = checksums2[:i]
imgList = imgList[:i]
imgListJson, err := json.Marshal(imgList)
if err != nil {
return err
}
req, err := http.NewRequest("PUT", INDEX_ENDPOINT+"/repositories/"+remote+"/", bytes.NewReader(imgListJson))
if err != nil {
return err
}
req.SetBasicAuth(authConfig.Username, authConfig.Password)
req.ContentLength = int64(len(imgListJson))
req.Header.Set("X-Docker-Token", "true")
res, err := client.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
for res.StatusCode >= 300 && res.StatusCode < 400 {
Debugf("Redirected to %s\n", res.Header.Get("Location"))
req, err = http.NewRequest("PUT", res.Header.Get("Location"), bytes.NewReader(imgListJson))
if err != nil {
return err
}
req.SetBasicAuth(authConfig.Username, authConfig.Password)
req.ContentLength = int64(len(imgListJson))
req.Header.Set("X-Docker-Token", "true")
res, err = client.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
}
if res.StatusCode != 200 && res.StatusCode != 201 {
return fmt.Errorf("Error: Status %d trying to push repository %s", res.StatusCode, remote)
}
var token, endpoints []string
if res.Header.Get("X-Docker-Token") != "" {
token = res.Header["X-Docker-Token"]
Debugf("Auth token: %v", token)
} else {
return fmt.Errorf("Index response didn't contain an access token")
}
if res.Header.Get("X-Docker-Endpoints") != "" {
endpoints = res.Header["X-Docker-Endpoints"]
} else {
return fmt.Errorf("Index response didn't contain any endpoints")
}
for _, registry := range endpoints {
fmt.Fprintf(stdout, "Pushing repository %s to %s (%d tags)\r\n", remote, registry,
len(localRepo))
// For each image within the repo, push them
for tag, imgId := range localRepo {
if err := graph.pushPrimitive(stdout, remote, tag, imgId, registry, token); err != nil {
// FIXME: Continue on error?
return err
}
}
}
checksumsJson, err := json.Marshal(checksums)
if err != nil {
return err
}
req2, err := http.NewRequest("PUT", INDEX_ENDPOINT+"/repositories/"+remote+"/images", bytes.NewReader(checksumsJson))
if err != nil {
return err
}
req2.SetBasicAuth(authConfig.Username, authConfig.Password)
req2.Header["X-Docker-Endpoints"] = endpoints
req2.ContentLength = int64(len(checksumsJson))
res2, err := client.Do(req2)
if err != nil {
return err
}
res2.Body.Close()
if res2.StatusCode != 204 {
return fmt.Errorf("Error: Status %d trying to push checksums %s", res.StatusCode, remote)
}
return nil
}
func (graph *Graph) Checksums(output io.Writer, repo Repository) ([]map[string]string, error) {
var result []map[string]string
checksums := map[string]string{}
for _, id := range repo {
img, err := graph.Get(id)
if err != nil {
return nil, err
}
err = img.WalkHistory(func(image *Image) error {
fmt.Fprintf(output, "Computing checksum for image %s\n", image.Id)
if _, exists := checksums[image.Id]; !exists {
checksums[image.Id], err = image.Checksum()
if err != nil {
return err
}
}
return nil
})
if err != nil {
return nil, err
}
}
i := 0
result = make([]map[string]string, len(checksums))
for id, sum := range checksums {
result[i] = map[string]string{
"id": id,
"checksum": sum,
}
i++
}
return result, nil
}
type SearchResults struct {
Query string `json:"query"`
NumResults int `json:"num_results"`
Results []map[string]string `json:"results"`
}
func (graph *Graph) SearchRepositories(stdout io.Writer, term string) (*SearchResults, error) {
client := graph.getHttpClient()
u := INDEX_ENDPOINT + "/search?q=" + url.QueryEscape(term)
req, err := http.NewRequest("GET", u, nil)
if err != nil {
return nil, err
}
res, err := client.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != 200 {
return nil, fmt.Errorf("Unexepected status code %d", res.StatusCode)
}
rawData, err := ioutil.ReadAll(res.Body)
if err != nil {
return nil, err
}
result := new(SearchResults)
err = json.Unmarshal(rawData, result)
return result, err
}