Update resolver to handle endpoint configuration

Adds support for registry mirrors
Adds support for multiple pull endpoints
Adds capabilities to limit trust in public mirrors
Fixes user agent header missing


Signed-off-by: Derek McGowan <derek@mcgstyle.net>

remotes/docker/fetcher_test.go

@@ -25,6 +25,7 @@ import (
 	"math/rand"
 	"net/http"
 	"net/http/httptest"
+	"net/url"
 	"testing"
 
 	"github.com/docker/distribution/registry/api/errcode"
@@ -46,14 +47,30 @@ func TestFetcherOpen(t *testing.T) {
 	}))
 	defer s.Close()
 
+	u, err := url.Parse(s.URL)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	f := dockerFetcher{&dockerBase{
-		client: s.Client(),
+		namespace: "nonempty",
 	}}
+
+	host := RegistryHost{
+		Client: s.Client(),
+		Host:   u.Host,
+		Scheme: u.Scheme,
+		Path:   u.Path,
+	}
+
 	ctx := context.Background()
 
+	req := f.request(host, http.MethodGet)
+
 	checkReader := func(o int64) {
 		t.Helper()
-		rc, err := f.open(ctx, s.URL, "", o)
+
+		rc, err := f.open(ctx, req, "", o)
 		if err != nil {
 			t.Fatalf("failed to open: %+v", err)
 		}
@@ -93,7 +110,7 @@ func TestFetcherOpen(t *testing.T) {
 	// Check that server returning a different content range
 	// then requested errors
 	start = 30
-	_, err := f.open(ctx, s.URL, "", 20)
+	_, err = f.open(ctx, req, "", 20)
 	if err == nil {
 		t.Fatal("expected error opening with invalid server response")
 	}
@@ -160,20 +177,34 @@ func TestDockerFetcherOpen(t *testing.T) {
 			}))
 			defer s.Close()
 
-			r := dockerFetcher{&dockerBase{
-				client: s.Client(),
+			u, err := url.Parse(s.URL)
+			if err != nil {
+				t.Fatal(err)
+			}
+
+			f := dockerFetcher{&dockerBase{
+				namespace: "ns",
 			}}
 
-			got, err := r.open(context.TODO(), s.URL, "", 0)
+			host := RegistryHost{
+				Client: s.Client(),
+				Host:   u.Host,
+				Scheme: u.Scheme,
+				Path:   u.Path,
+			}
+
+			req := f.request(host, http.MethodGet)
+
+			got, err := f.open(context.TODO(), req, "", 0)
 			assert.Equal(t, tt.wantErr, (err != nil))
 			assert.Equal(t, tt.want, got)
 			assert.Equal(t, tt.retries, 0)
 			if tt.wantErr {
 				var expectedError error
 				if tt.wantServerMessageError {
-					expectedError = errors.Errorf("unexpected status code %v: %v %s - Server message: %s", s.URL, tt.mockedStatus, http.StatusText(tt.mockedStatus), tt.mockedErr.Error())
+					expectedError = errors.Errorf("unexpected status code %v/ns: %v %s - Server message: %s", s.URL, tt.mockedStatus, http.StatusText(tt.mockedStatus), tt.mockedErr.Error())
 				} else if tt.wantPlainError {
-					expectedError = errors.Errorf("unexpected status code %v: %v %s", s.URL, tt.mockedStatus, http.StatusText(tt.mockedStatus))
+					expectedError = errors.Errorf("unexpected status code %v/ns: %v %s", s.URL, tt.mockedStatus, http.StatusText(tt.mockedStatus))
 				}
 				assert.Equal(t, expectedError.Error(), err.Error())