sync: allow HTTP redirects when GETing signatures blobs

Signed-off-by: Petu Eusebiu <peusebiu@cisco.com>

pkg/extensions/sync/sync.go

@@ -28,7 +28,8 @@ import (
 )
 
 const (
-	SyncBlobUploadDir = ".sync"
+	SyncBlobUploadDir     = ".sync"
+	httpMaxRedirectsCount = 15
 )
 
 // /v2/_catalog struct.

pkg/extensions/sync/utils.go

@@ -251,6 +251,8 @@ func getHTTPClient(regCfg *RegistryConfig, upstreamURL string, credentials Crede
 		client.SetBasicAuth(credentials.Username, credentials.Password)
 	}
 
+	client.SetRedirectPolicy(resty.FlexibleRedirectPolicy(httpMaxRedirectsCount))
+
 	return client, registryURL, nil
 }