@@ -334,13 +334,28 @@ func (graph *Graph) pushTag(remote, revision, tag string, authConfig *auth.AuthC

 func (graph *Graph) LookupRemoteRepository(remote string, authConfig *auth.AuthConfig) bool {

 	rt := &http.Transport{Proxy: http.ProxyFromEnvironment}

-	req, err := http.NewRequest("GET", REGISTRY_ENDPOINT+"/users/"+remote, nil)

+	var repositoryTarget string

+	// If we are asking for 'root' repository, lookup on the Library's registry

+	if strings.Index(remote, "/") == -1 {

+		repositoryTarget = REGISTRY_ENDPOINT + "/library/" + remote + "/lookup"

+	} else {

+		repositoryTarget = REGISTRY_ENDPOINT + "/users/" + remote + "/lookup"

+	}

+	Debugf("Checking for permissions on: %s", repositoryTarget)

+	req, err := http.NewRequest("PUT", repositoryTarget, strings.NewReader("\"\""))

 	if err != nil {

+		Debugf("%s\n", err)

 		return false

 	}

 	req.SetBasicAuth(authConfig.Username, authConfig.Password)

+	req.Header.Add("Content-type", "application/json")

 	res, err := rt.RoundTrip(req)

-	if err != nil || res.StatusCode != 200 {

+	if err != nil || res.StatusCode != 404 {

+		errBody, err := ioutil.ReadAll(res.Body)

+		if err != nil {

+			errBody = []byte(err.Error())

+		}

+		Debugf("Lookup status code: %d (body: %s)", res.StatusCode, errBody)

 		return false

 	}

 	return true

@@ -370,11 +385,10 @@ func (graph *Graph) pushPrimitive(stdout io.Writer, remote, tag, imgId string, a

 // 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 {

-	// Check if the remote repository exists

-	// FIXME: @lopter How to handle this?

-	// if !graph.LookupRemoteRepository(remote, authConfig) {

-	// 	return fmt.Errorf("The remote repository %s does not exist\n", remote)

-	// }

+	// Check if the remote repository exists/if we have the permission

+	if !graph.LookupRemoteRepository(remote, authConfig) {

+		return fmt.Errorf("Permission denied on repository %s\n", remote)

+	}

 	fmt.Fprintf(stdout, "Pushing repository %s (%d tags)\n", remote, len(localRepo))

 	// For each image within the repo, push them