Merge pull request #20209 from aaronlehmann/upper-case-hostnames

Allow uppercase characters in image reference hostname

hack/vendor.sh

@@ -48,7 +48,7 @@ clone git github.com/boltdb/bolt v1.1.0
 clone git github.com/miekg/dns 75e6e86cc601825c5dbcd4e0c209eab180997cd7
 
 # get graph and distribution packages
-clone git github.com/docker/distribution ab9b433fcaf7c8319562a8b80f2720f5faca712f
+clone git github.com/docker/distribution 77534e734063a203981df7024fe8ca9228b86930
 clone git github.com/vbatts/tar-split v0.9.11
 
 # get desired notary commit, might also need to be updated in Dockerfile

integration-cli/docker_cli_tag_test.go

@@ -31,7 +31,7 @@ func (s *DockerSuite) TestTagUnprefixedRepoByID(c *check.C) {
 
 // ensure we don't allow the use of invalid repository names; these tag operations should fail
 func (s *DockerSuite) TestTagInvalidUnprefixedRepo(c *check.C) {
-	invalidRepos := []string{"fo$z$", "Foo@3cc", "Foo$3", "Foo*3", "Fo^3", "Foo!3", "F)xcz(", "fo%asd"}
+	invalidRepos := []string{"fo$z$", "Foo@3cc", "Foo$3", "Foo*3", "Fo^3", "Foo!3", "F)xcz(", "fo%asd", "FOO/bar"}
 
 	for _, repo := range invalidRepos {
 		out, _, err := dockerCmdWithError("tag", "busybox", repo)
@@ -61,7 +61,7 @@ func (s *DockerSuite) TestTagValidPrefixedRepo(c *check.C) {
 		}
 	}
 
-	validRepos := []string{"fooo/bar", "fooaa/test", "foooo:t"}
+	validRepos := []string{"fooo/bar", "fooaa/test", "foooo:t", "HOSTNAME.DOMAIN.COM:443/foo/bar"}
 
 	for _, repo := range validRepos {
 		_, _, err := dockerCmdWithError("tag", "busybox:latest", repo)

reference/reference.go

@@ -1,6 +1,7 @@
 package reference
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -72,7 +73,10 @@ func ParseNamed(s string) (Named, error) {
 // WithName returns a named object representing the given string. If the input
 // is invalid ErrReferenceInvalidFormat will be returned.
 func WithName(name string) (Named, error) {
-	name = normalize(name)
+	name, err := normalize(name)
+	if err != nil {
+		return nil, err
+	}
 	if err := validateName(name); err != nil {
 		return nil, err
 	}
@@ -172,15 +176,18 @@ func splitHostname(name string) (hostname, remoteName string) {
 
 // normalize returns a repository name in its normalized form, meaning it
 // will not contain default hostname nor library/ prefix for official images.
-func normalize(name string) string {
+func normalize(name string) (string, error) {
 	host, remoteName := splitHostname(name)
+	if strings.ToLower(remoteName) != remoteName {
+		return "", errors.New("invalid reference format: repository name must be lowercase")
+	}
 	if host == DefaultHostname {
 		if strings.HasPrefix(remoteName, DefaultRepoPrefix) {
-			return strings.TrimPrefix(remoteName, DefaultRepoPrefix)
+			return strings.TrimPrefix(remoteName, DefaultRepoPrefix), nil
 		}
-		return remoteName
+		return remoteName, nil
 	}
-	return name
+	return name, nil
 }
 
 func validateName(name string) error {

vendor/src/github.com/docker/distribution/reference/reference.go

@@ -6,7 +6,7 @@
 // 	reference                       := repository [ ":" tag ] [ "@" digest ]
 //	name                            := [hostname '/'] component ['/' component]*
 //	hostname                        := hostcomponent ['.' hostcomponent]* [':' port-number]
-//	hostcomponent                   := /([a-z0-9]|[a-z0-9][a-z0-9-]*[a-z0-9])/
+//	hostcomponent                   := /([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])/
 //	port-number                     := /[0-9]+/
 //	component                       := alpha-numeric [separator alpha-numeric]*
 // 	alpha-numeric                   := /[a-z0-9]+/

vendor/src/github.com/docker/distribution/reference/regexp.go

@@ -22,7 +22,7 @@ var (
 	// hostnameComponentRegexp restricts the registry hostname component of a
 	// repository name to start with a component as defined by hostnameRegexp
 	// and followed by an optional port.
-	hostnameComponentRegexp = match(`(?:[a-z0-9]|[a-z0-9][a-z0-9-]*[a-z0-9])`)
+	hostnameComponentRegexp = match(`(?:[a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9-]*[a-zA-Z0-9])`)
 
 	// hostnameRegexp defines the structure of potential hostname components
 	// that may be part of image names. This is purposely a subset of what is

vendor/src/github.com/docker/distribution/registry/client/repository.go

@@ -36,8 +36,21 @@ func checkHTTPRedirect(req *http.Request, via []*http.Request) error {
 
 	if len(via) > 0 {
 		for headerName, headerVals := range via[0].Header {
-			if headerName == "Accept" || headerName == "Range" {
-				for _, val := range headerVals {
+			if headerName != "Accept" && headerName != "Range" {
+				continue
+			}
+			for _, val := range headerVals {
+				// Don't add to redirected request if redirected
+				// request already has a header with the same
+				// name and value.
+				hasValue := false
+				for _, existingVal := range req.Header[headerName] {
+					if existingVal == val {
+						hasValue = true
+						break
+					}
+				}
+				if !hasValue {
 					req.Header.Add(headerName, val)
 				}
 			}