Merge branch 'mhennings-1357-implement-login-with-private-registry' into api_1_5

api.go

@@ -2,6 +2,7 @@ package docker
 
 import (
 	"code.google.com/p/go.net/websocket"
+	"encoding/base64"
 	"encoding/json"
 	"fmt"
 	"github.com/dotcloud/docker/auth"
@@ -394,6 +395,16 @@ func postImagesCreate(srv *Server, version float64, w http.ResponseWriter, r *ht
 	tag := r.Form.Get("tag")
 	repo := r.Form.Get("repo")
 
+	authEncoded := r.Header.Get("X-Registry-Auth")
+	authConfig := &auth.AuthConfig{}
+	if authEncoded != "" {
+		authJson := base64.NewDecoder(base64.URLEncoding, strings.NewReader(authEncoded))
+		if err := json.NewDecoder(authJson).Decode(authConfig); err != nil {
+			// for a pull it is not an error if no auth was given
+			// to increase compatibility with the existing api it is defaulting to be empty
+			authConfig = &auth.AuthConfig{}
+		}
+	}
 	if version > 1.0 {
 		w.Header().Set("Content-Type", "application/json")
 	}
@@ -405,7 +416,7 @@ func postImagesCreate(srv *Server, version float64, w http.ResponseWriter, r *ht
 				metaHeaders[k] = v
 			}
 		}
-		if err := srv.ImagePull(image, tag, w, sf, &auth.AuthConfig{}, metaHeaders, version > 1.3); err != nil {
+		if err := srv.ImagePull(image, tag, w, sf, authConfig, metaHeaders, version > 1.3); err != nil {
 			if sf.Used() {
 				w.Write(sf.FormatError(err))
 				return nil
@@ -473,19 +484,32 @@ func postImagesInsert(srv *Server, version float64, w http.ResponseWriter, r *ht
 }
 
 func postImagesPush(srv *Server, version float64, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
-	authConfig := &auth.AuthConfig{}
 	metaHeaders := map[string][]string{}
 	for k, v := range r.Header {
 		if strings.HasPrefix(k, "X-Meta-") {
 			metaHeaders[k] = v
 		}
 	}
-	if err := json.NewDecoder(r.Body).Decode(authConfig); err != nil {
-		return err
-	}
 	if err := parseForm(r); err != nil {
 		return err
 	}
+	authConfig := &auth.AuthConfig{}
+
+	authEncoded := r.Header.Get("X-Registry-Auth")
+	if authEncoded != "" {
+		// the new format is to handle the authConfig as a header
+		authJson := base64.NewDecoder(base64.URLEncoding, strings.NewReader(authEncoded))
+		if err := json.NewDecoder(authJson).Decode(authConfig); err != nil {
+			// to increase compatibility to existing api it is defaulting to be empty
+			authConfig = &auth.AuthConfig{}
+		}
+	} else {
+		// the old format is supported for compatibility if there was no authConfig header
+		if err := json.NewDecoder(r.Body).Decode(authConfig); err != nil {
+			return err
+		}
+
+	}
 
 	if vars == nil {
 		return fmt.Errorf("Missing parameter")

auth/auth.go

@@ -26,10 +26,11 @@ var (
 )
 
 type AuthConfig struct {
-	Username string `json:"username,omitempty"`
+	Username      string `json:"username,omitempty"`
-	Password string `json:"password,omitempty"`
+	Password      string `json:"password,omitempty"`
-	Auth     string `json:"auth"`
+	Auth          string `json:"auth"`
-	Email    string `json:"email"`
+	Email         string `json:"email"`
+	ServerAddress string `json:"serveraddress,omitempty"`
 }
 
 type ConfigFile struct {
@@ -96,6 +97,7 @@ func LoadConfig(rootPath string) (*ConfigFile, error) {
 		}
 		origEmail := strings.Split(arr[1], " = ")
 		authConfig.Email = origEmail[1]
+		authConfig.ServerAddress = IndexServerAddress()
 		configFile.Configs[IndexServerAddress()] = authConfig
 	} else {
 		for k, authConfig := range configFile.Configs {
@@ -105,6 +107,7 @@ func LoadConfig(rootPath string) (*ConfigFile, error) {
 			}
 			authConfig.Auth = ""
 			configFile.Configs[k] = authConfig
+			authConfig.ServerAddress = k
 		}
 	}
 	return &configFile, nil
@@ -125,7 +128,7 @@ func SaveConfig(configFile *ConfigFile) error {
 		authCopy.Auth = encodeAuth(&authCopy)
 		authCopy.Username = ""
 		authCopy.Password = ""
-
+		authCopy.ServerAddress = ""
 		configs[k] = authCopy
 	}
 
@@ -146,14 +149,26 @@ func Login(authConfig *AuthConfig, factory *utils.HTTPRequestFactory) (string, e
 	reqStatusCode := 0
 	var status string
 	var reqBody []byte
-	jsonBody, err := json.Marshal(authConfig)
+
+	serverAddress := authConfig.ServerAddress
+	if serverAddress == "" {
+		serverAddress = IndexServerAddress()
+	}
+
+	loginAgainstOfficialIndex := serverAddress == IndexServerAddress()
+
+	// to avoid sending the server address to the server it should be removed before marshalled
+	authCopy := *authConfig
+	authCopy.ServerAddress = ""
+
+	jsonBody, err := json.Marshal(authCopy)
 	if err != nil {
 		return "", fmt.Errorf("Config Error: %s", err)
 	}
 
 	// using `bytes.NewReader(jsonBody)` here causes the server to respond with a 411 status.
 	b := strings.NewReader(string(jsonBody))
-	req1, err := http.Post(IndexServerAddress()+"users/", "application/json; charset=utf-8", b)
+	req1, err := http.Post(serverAddress+"users/", "application/json; charset=utf-8", b)
 	if err != nil {
 		return "", fmt.Errorf("Server Error: %s", err)
 	}
@@ -165,14 +180,23 @@ func Login(authConfig *AuthConfig, factory *utils.HTTPRequestFactory) (string, e
 	}
 
 	if reqStatusCode == 201 {
-		status = "Account created. Please use the confirmation link we sent" +
+		if loginAgainstOfficialIndex {
-			" to your e-mail to activate it."
+			status = "Account created. Please use the confirmation link we sent" +
+				" to your e-mail to activate it."
+		} else {
+			status = "Account created. Please see the documentation of the registry " + serverAddress + " for instructions how to activate it."
+		}
 	} else if reqStatusCode == 403 {
-		return "", fmt.Errorf("Login: Your account hasn't been activated. " +
+		if loginAgainstOfficialIndex {
-			"Please check your e-mail for a confirmation link.")
+			return "", fmt.Errorf("Login: Your account hasn't been activated. " +
+				"Please check your e-mail for a confirmation link.")
+		} else {
+			return "", fmt.Errorf("Login: Your account hasn't been activated. " +
+				"Please see the documentation of the registry " + serverAddress + " for instructions how to activate it.")
+		}
 	} else if reqStatusCode == 400 {
 		if string(reqBody) == "\"Username or email already exists\"" {
-			req, err := factory.NewRequest("GET", IndexServerAddress()+"users/", nil)
+			req, err := factory.NewRequest("GET", serverAddress+"users/", nil)
 			req.SetBasicAuth(authConfig.Username, authConfig.Password)
 			resp, err := client.Do(req)
 			if err != nil {
@@ -199,3 +223,52 @@ func Login(authConfig *AuthConfig, factory *utils.HTTPRequestFactory) (string, e
 	}
 	return status, nil
 }
+
+// this method matches a auth configuration to a server address or a url
+func (config *ConfigFile) ResolveAuthConfig(registry string) AuthConfig {
+	if registry == IndexServerAddress() || len(registry) == 0 {
+		// default to the index server
+		return config.Configs[IndexServerAddress()]
+	}
+	// if its not the index server there are three cases:
+	//
+	// 1. this is a full config url -> it should be used as is
+	// 2. it could be a full url, but with the wrong protocol
+	// 3. it can be the hostname optionally with a port
+	//
+	// as there is only one auth entry which is fully qualified we need to start
+	// parsing and matching
+
+	swapProtocoll := func(url string) string {
+		if strings.HasPrefix(url, "http:") {
+			return strings.Replace(url, "http:", "https:", 1)
+		}
+		if strings.HasPrefix(url, "https:") {
+			return strings.Replace(url, "https:", "http:", 1)
+		}
+		return url
+	}
+
+	resolveIgnoringProtocol := func(url string) AuthConfig {
+		if c, found := config.Configs[url]; found {
+			return c
+		}
+		registrySwappedProtocoll := swapProtocoll(url)
+		// now try to match with the different protocol
+		if c, found := config.Configs[registrySwappedProtocoll]; found {
+			return c
+		}
+		return AuthConfig{}
+	}
+
+	// match both protocols as it could also be a server name like httpfoo
+	if strings.HasPrefix(registry, "http:") || strings.HasPrefix(registry, "https:") {
+		return resolveIgnoringProtocol(registry)
+	}
+
+	url := "https://" + registry
+	if !strings.Contains(registry, "/") {
+		url = url + "/v1/"
+	}
+	return resolveIgnoringProtocol(url)
+}

commands.go

@@ -4,10 +4,12 @@ import (
 	"archive/tar"
 	"bufio"
 	"bytes"
+	"encoding/base64"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"github.com/dotcloud/docker/auth"
+	"github.com/dotcloud/docker/registry"
 	"github.com/dotcloud/docker/term"
 	"github.com/dotcloud/docker/utils"
 	"io"
@@ -92,6 +94,7 @@ func (cli *DockerCli) CmdHelp(args ...string) error {
 		{"login", "Register or Login to the docker registry server"},
 		{"logs", "Fetch the logs of a container"},
 		{"port", "Lookup the public-facing port which is NAT-ed to PRIVATE_PORT"},
+		{"top", "Lookup the running processes of a container"},
 		{"ps", "List containers"},
 		{"pull", "Pull an image or a repository from the docker registry server"},
 		{"push", "Push an image or a repository to the docker registry server"},
@@ -103,7 +106,6 @@ func (cli *DockerCli) CmdHelp(args ...string) error {
 		{"start", "Start a stopped container"},
 		{"stop", "Stop a running container"},
 		{"tag", "Tag an image into a repository"},
-		{"top", "Lookup the running processes of a container"},
 		{"version", "Show the docker version information"},
 		{"wait", "Block until a container stops, then print its exit code"},
 	} {
@@ -127,7 +129,7 @@ func (cli *DockerCli) CmdInsert(args ...string) error {
 	v.Set("url", cmd.Arg(1))
 	v.Set("path", cmd.Arg(2))
 
-	if err := cli.stream("POST", "/images/"+cmd.Arg(0)+"/insert?"+v.Encode(), nil, cli.out); err != nil {
+	if err := cli.stream("POST", "/images/"+cmd.Arg(0)+"/insert?"+v.Encode(), nil, cli.out, nil); err != nil {
 		return err
 	}
 	return nil
@@ -188,10 +190,8 @@ func (cli *DockerCli) CmdBuild(args ...string) error {
 	} else if utils.IsURL(cmd.Arg(0)) || utils.IsGIT(cmd.Arg(0)) {
 		isRemote = true
 	} else {
-		if fi, err := os.Stat(cmd.Arg(0)); err != nil {
+		if _, err := os.Stat(cmd.Arg(0)); err != nil {
 			return err
-		} else if !fi.IsDir() {
-			return fmt.Errorf("\"%s\" is not a path or URL. Please provide a path to a directory containing a Dockerfile.", cmd.Arg(0))
 		}
 		context, err = Tar(cmd.Arg(0), Uncompressed)
 	}
@@ -255,7 +255,7 @@ func (cli *DockerCli) CmdBuild(args ...string) error {
 
 // 'docker login': login / register a user to registry service.
 func (cli *DockerCli) CmdLogin(args ...string) error {
-	cmd := Subcmd("login", "[OPTIONS]", "Register or Login to the docker registry server")
+	cmd := Subcmd("login", "[OPTIONS] [SERVER]", "Register or Login to a docker registry server, if no server is specified \""+auth.IndexServerAddress()+"\" is the default.")
 
 	var username, password, email string
 
@@ -263,10 +263,17 @@ func (cli *DockerCli) CmdLogin(args ...string) error {
 	cmd.StringVar(&password, "p", "", "password")
 	cmd.StringVar(&email, "e", "", "email")
 	err := cmd.Parse(args)
-
 	if err != nil {
 		return nil
 	}
+	serverAddress := auth.IndexServerAddress()
+	if len(cmd.Args()) > 0 {
+		serverAddress, err = registry.ExpandAndVerifyRegistryUrl(cmd.Arg(0))
+		if err != nil {
+			return err
+		}
+		fmt.Fprintf(cli.out, "Login against server at %s\n", serverAddress)
+	}
 
 	promptDefault := func(prompt string, configDefault string) {
 		if configDefault == "" {
@@ -299,19 +306,16 @@ func (cli *DockerCli) CmdLogin(args ...string) error {
 			username = authconfig.Username
 		}
 	}
-
 	if username != authconfig.Username {
 		if password == "" {
 			oldState, _ := term.SaveState(cli.terminalFd)
 			fmt.Fprintf(cli.out, "Password: ")
-
 			term.DisableEcho(cli.terminalFd, oldState)
 
 			password = readInput(cli.in, cli.out)
 			fmt.Fprint(cli.out, "\n")
 
 			term.RestoreTerminal(cli.terminalFd, oldState)
-
 			if password == "" {
 				return fmt.Errorf("Error : Password Required")
 			}
@@ -328,15 +332,15 @@ func (cli *DockerCli) CmdLogin(args ...string) error {
 		password = authconfig.Password
 		email = authconfig.Email
 	}
-
 	authconfig.Username = username
 	authconfig.Password = password
 	authconfig.Email = email
-	cli.configFile.Configs[auth.IndexServerAddress()] = authconfig
+	authconfig.ServerAddress = serverAddress
+	cli.configFile.Configs[serverAddress] = authconfig
 
-	body, statusCode, err := cli.call("POST", "/auth", cli.configFile.Configs[auth.IndexServerAddress()])
+	body, statusCode, err := cli.call("POST", "/auth", cli.configFile.Configs[serverAddress])
 	if statusCode == 401 {
-		delete(cli.configFile.Configs, auth.IndexServerAddress())
+		delete(cli.configFile.Configs, serverAddress)
 		auth.SaveConfig(cli.configFile)
 		return err
 	}
@@ -792,7 +796,7 @@ func (cli *DockerCli) CmdImport(args ...string) error {
 	v.Set("tag", tag)
 	v.Set("fromSrc", src)
 
-	err := cli.stream("POST", "/images/create?"+v.Encode(), cli.in, cli.out)
+	err := cli.stream("POST", "/images/create?"+v.Encode(), cli.in, cli.out, nil)
 	if err != nil {
 		return err
 	}
@@ -813,6 +817,13 @@ func (cli *DockerCli) CmdPush(args ...string) error {
 
 	cli.LoadConfigFile()
 
+	// Resolve the Repository name from fqn to endpoint + name
+	endpoint, _, err := registry.ResolveRepositoryName(name)
+	if err != nil {
+		return err
+	}
+	// Resolve the Auth config relevant for this server
+	authConfig := cli.configFile.ResolveAuthConfig(endpoint)
 	// If we're not using a custom registry, we know the restrictions
 	// applied to repository names and can warn the user in advance.
 	// Custom repositories can have different rules, and we must also
@@ -826,22 +837,28 @@ func (cli *DockerCli) CmdPush(args ...string) error {
 	}
 
 	v := url.Values{}
-	push := func() error {
+	push := func(authConfig auth.AuthConfig) error {
-		buf, err := json.Marshal(cli.configFile.Configs[auth.IndexServerAddress()])
+		buf, err := json.Marshal(authConfig)
 		if err != nil {
 			return err
 		}
+		registryAuthHeader := []string{
+			base64.URLEncoding.EncodeToString(buf),
+		}
 
-		return cli.stream("POST", "/images/"+name+"/push?"+v.Encode(), bytes.NewBuffer(buf), cli.out)
+		return cli.stream("POST", "/images/"+name+"/push?"+v.Encode(), nil, cli.out, map[string][]string{
+			"X-Registry-Auth": registryAuthHeader,
+		})
 	}
 
-	if err := push(); err != nil {
+	if err := push(authConfig); err != nil {
-		if err.Error() == "Authentication is required." {
+		if err.Error() == registry.ErrLoginRequired.Error() {
 			fmt.Fprintln(cli.out, "\nPlease login prior to push:")
-			if err := cli.CmdLogin(""); err != nil {
+			if err := cli.CmdLogin(endpoint); err != nil {
 				return err
 			}
-			return push()
+			authConfig := cli.configFile.ResolveAuthConfig(endpoint)
+			return push(authConfig)
 		}
 		return err
 	}
@@ -865,11 +882,43 @@ func (cli *DockerCli) CmdPull(args ...string) error {
 		*tag = parsedTag
 	}
 
+	// Resolve the Repository name from fqn to endpoint + name
+	endpoint, _, err := registry.ResolveRepositoryName(remote)
+	if err != nil {
+		return err
+	}
+
+	cli.LoadConfigFile()
+
+	// Resolve the Auth config relevant for this server
+	authConfig := cli.configFile.ResolveAuthConfig(endpoint)
 	v := url.Values{}
 	v.Set("fromImage", remote)
 	v.Set("tag", *tag)
 
-	if err := cli.stream("POST", "/images/create?"+v.Encode(), nil, cli.out); err != nil {
+	pull := func(authConfig auth.AuthConfig) error {
+		buf, err := json.Marshal(authConfig)
+		if err != nil {
+			return err
+		}
+		registryAuthHeader := []string{
+			base64.URLEncoding.EncodeToString(buf),
+		}
+
+		return cli.stream("POST", "/images/create?"+v.Encode(), nil, cli.out, map[string][]string{
+			"X-Registry-Auth": registryAuthHeader,
+		})
+	}
+
+	if err := pull(authConfig); err != nil {
+		if err.Error() == registry.ErrLoginRequired.Error() {
+			fmt.Fprintln(cli.out, "\nPlease login prior to push:")
+			if err := cli.CmdLogin(endpoint); err != nil {
+				return err
+			}
+			authConfig := cli.configFile.ResolveAuthConfig(endpoint)
+			return pull(authConfig)
+		}
 		return err
 	}
 
@@ -1116,7 +1165,7 @@ func (cli *DockerCli) CmdEvents(args ...string) error {
 		v.Set("since", *since)
 	}
 
-	if err := cli.stream("GET", "/events?"+v.Encode(), nil, cli.out); err != nil {
+	if err := cli.stream("GET", "/events?"+v.Encode(), nil, cli.out, nil); err != nil {
 		return err
 	}
 	return nil
@@ -1133,7 +1182,7 @@ func (cli *DockerCli) CmdExport(args ...string) error {
 		return nil
 	}
 
-	if err := cli.stream("GET", "/containers/"+cmd.Arg(0)+"/export", nil, cli.out); err != nil {
+	if err := cli.stream("GET", "/containers/"+cmd.Arg(0)+"/export", nil, cli.out, nil); err != nil {
 		return err
 	}
 	return nil
@@ -1405,7 +1454,30 @@ func (cli *DockerCli) CmdRun(args ...string) error {
 		repos, tag := utils.ParseRepositoryTag(config.Image)
 		v.Set("fromImage", repos)
 		v.Set("tag", tag)
-		err = cli.stream("POST", "/images/create?"+v.Encode(), nil, cli.err)
+
+		// Resolve the Repository name from fqn to endpoint + name
+		var endpoint string
+		endpoint, _, err = registry.ResolveRepositoryName(repos)
+		if err != nil {
+			return err
+		}
+
+		// Load the auth config file, to be able to pull the image
+		cli.LoadConfigFile()
+
+		// Resolve the Auth config relevant for this server
+		authConfig := cli.configFile.ResolveAuthConfig(endpoint)
+		buf, err := json.Marshal(authConfig)
+		if err != nil {
+			return err
+		}
+
+		registryAuthHeader := []string{
+			base64.URLEncoding.EncodeToString(buf),
+		}
+		err = cli.stream("POST", "/images/create?"+v.Encode(), nil, cli.err, map[string][]string{
+			"X-Registry-Auth": registryAuthHeader,
+		})
 		if err != nil {
 			return err
 		}
@@ -1582,7 +1654,7 @@ func (cli *DockerCli) call(method, path string, data interface{}) ([]byte, int,
 	return body, resp.StatusCode, nil
 }
 
-func (cli *DockerCli) stream(method, path string, in io.Reader, out io.Writer) error {
+func (cli *DockerCli) stream(method, path string, in io.Reader, out io.Writer, headers map[string][]string) error {
 	if (method == "POST" || method == "PUT") && in == nil {
 		in = bytes.NewReader([]byte{})
 	}
@@ -1595,6 +1667,13 @@ func (cli *DockerCli) stream(method, path string, in io.Reader, out io.Writer) e
 	if method == "POST" {
 		req.Header.Set("Content-Type", "plain/text")
 	}
+
+	if headers != nil {
+		for k, v := range headers {
+			req.Header[k] = v
+		}
+	}
+
 	dial, err := net.Dial(cli.proto, cli.addr)
 	if err != nil {
 		if strings.Contains(err.Error(), "connection refused") {

docs/sources/api/docker_remote_api_v1.4.rst

@@ -991,7 +991,8 @@ Check auth configuration
 	   {
 		"username":"hannibal",
 		"password:"xxxx",
-		"email":"hannibal@a-team.com"
+		"email":"hannibal@a-team.com",
+		"serveraddress":"https://index.docker.io/v1/"
 	   }
 
         **Example response**:

docs/sources/commandline/command/login.rst

@@ -8,10 +8,17 @@
 
 ::
 
-    Usage: docker login [OPTIONS]
+    Usage: docker login [OPTIONS] [SERVER]
 
     Register or Login to the docker registry server
 
     -e="": email
     -p="": password
     -u="": username
+
+    If you want to login to a private registry you can
+    specify this by adding the server name.
+
+    example:
+    docker login localhost:8080
+

registry/registry.go

@@ -22,6 +22,7 @@ import (
 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) error {
@@ -102,17 +103,38 @@ func ResolveRepositoryName(reposName string) (string, string, error) {
 	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 "", errors.New("Invalid Registry endpoint: " + err.Error())
 		}
 	}
-	err := validateRepositoryName(reposName)
+	return endpoint, nil
-	return endpoint, reposName, err
 }
 
 func doWithCookies(c *http.Client, req *http.Request) (*http.Response, error) {
@@ -139,6 +161,9 @@ func (r *Registry) GetRemoteHistory(imgID, registry string, token []string) ([]s
 	req.Header.Set("Authorization", "Token "+strings.Join(token, ", "))
 	res, err := doWithCookies(r.client, req)
 	if err != nil || res.StatusCode != 200 {
+		if res.StatusCode == 401 {
+			return nil, ErrLoginRequired
+		}
 		if res != nil {
 			return nil, utils.NewHTTPRequestError(fmt.Sprintf("Internal server error: %d trying to fetch remote history for %s", res.StatusCode, imgID), res)
 		}
@@ -282,7 +307,7 @@ func (r *Registry) GetRepositoryData(indexEp, remote string) (*RepositoryData, e
 	}
 	defer res.Body.Close()
 	if res.StatusCode == 401 {
-		return nil, utils.NewHTTPRequestError(fmt.Sprintf("Please login first (HTTP code %d)", res.StatusCode), res)
+		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.

server.go

@@ -655,6 +655,9 @@ func (srv *Server) ImagePull(localName string, tag string, out io.Writer, sf *ut
 
 	out = utils.NewWriteFlusher(out)
 	err = srv.pullRepository(r, out, localName, remoteName, tag, endpoint, sf, parallel)
+	if err == registry.ErrLoginRequired {
+		return err
+	}
 	if err != nil {
 		if err := srv.pullImage(r, out, remoteName, endpoint, nil, sf); err != nil {
 			return err