when --no-list is specified avoid every List() call (#5082)

Author: harshavardhana

cmd/client-s3.go

@@ -1659,18 +1659,21 @@ func (c *S3Client) Stat(ctx context.Context, opts StatOptions) (*ClientContent,
 		if opts.isZip {
 			o.Set("x-minio-extract", "true")
 		}
+
 		o.Set("x-amz-checksum-mode", "ENABLED")
 		ctnt, err := c.getObjectStat(ctx, bucket, path, o)
 		if err == nil {
 			return ctnt, nil
 		}
+
 		// Ignore object missing error but return for other errors
 		if !errors.As(err.ToGoError(), &ObjectMissing{}) && !errors.As(err.ToGoError(), &ObjectIsDeleteMarker{}) {
 			return nil, err
 		}
 
 		// when versionID is specified we do not have to perform List() operation
-		if opts.versionID != "" && errors.As(err.ToGoError(), &ObjectMissing{}) || errors.As(err.ToGoError(), &ObjectIsDeleteMarker{}) {
+		// when headOnly is specified we do not have to perform List() operation
+		if (opts.versionID != "" || opts.headOnly) && errors.As(err.ToGoError(), &ObjectMissing{}) || errors.As(err.ToGoError(), &ObjectIsDeleteMarker{}) {
 			return nil, probe.NewError(ObjectMissing{opts.timeRef})
 		}
 

cmd/client-url.go

@@ -212,6 +212,7 @@ func url2Stat(ctx context.Context, opts url2StatOptions) (client Client, content
 		versionID:          opts.versionID,
 		isZip:              opts.isZip,
 		ignoreBucketExists: opts.ignoreBucketExistsCheck,
+		headOnly:           opts.headOnly,
 	})
 	if err != nil {
 		return nil, nil, err.Trace(opts.urlStr)

cmd/client.go

@@ -88,6 +88,7 @@ type StatOptions struct {
 	includeVersions    bool
 	isZip              bool
 	ignoreBucketExists bool
+	headOnly           bool
 }
 
 // BucketStatOptions - bucket stat.