cli/registry/client: un-export ErrHTTPProto

This type was added in 02719bd, but was
never used outside of the package itself. This patch un-exports it.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/registry/client/client.go

@@ -54,13 +54,13 @@ func (err ErrBlobCreated) Error() string {
 		err.From, err.Target)
 }
 
-// ErrHTTPProto returned if attempting to use TLS with a non-TLS registry
-type ErrHTTPProto struct {
-	OrigErr string
+// httpProtoError returned if attempting to use TLS with a non-TLS registry
+type httpProtoError struct {
+	cause error
 }
 
-func (err ErrHTTPProto) Error() string {
-	return err.OrigErr
+func (e httpProtoError) Error() string {
+	return e.cause.Error()
 }
 
 var _ RegistryClient = &client{}
@@ -131,7 +131,7 @@ func (c *client) getRepositoryForReference(ctx context.Context, ref reference.Na
 			return nil, err
 		}
 		if !repoEndpoint.endpoint.TLSConfig.InsecureSkipVerify {
-			return nil, ErrHTTPProto{OrigErr: err.Error()}
+			return nil, httpProtoError{cause: err}
 		}
 		// --insecure was set; fall back to plain HTTP
 		if url := repoEndpoint.endpoint.URL; url != nil && url.Scheme == "https" {

cli/registry/client/fetcher.go

@@ -241,7 +241,8 @@ func (c *client) iterateEndpoints(ctx context.Context, namedRef reference.Named,
 		repo, err := c.getRepositoryForReference(ctx, namedRef, repoEndpoint)
 		if err != nil {
 			logrus.Debugf("error %s with repo endpoint %+v", err, repoEndpoint)
-			if _, ok := err.(ErrHTTPProto); ok {
+			var protoErr httpProtoError
+			if errors.As(err, &protoErr) {
 				continue
 			}
 			return err