fstest: implement method to skip ChunkedCopy tests

backend/s3/s3.go

@@ -3091,6 +3091,9 @@ func (f *Fs) setUploadCutoff(cs fs.SizeSuffix) (old fs.SizeSuffix, err error) {
 }
 
 func (f *Fs) setCopyCutoff(cs fs.SizeSuffix) (old fs.SizeSuffix, err error) {
+	if f.opt.CopyCutoff == math.MaxInt64 {
+		return f.opt.CopyCutoff, fmt.Errorf("--s3-copy-cutoff not supported: %w", fs.ErrorNotImplemented)
+	}
 	err = checkUploadChunkSize(cs)
 	if err == nil {
 		old, f.opt.CopyCutoff = f.opt.CopyCutoff, cs
@@ -3234,6 +3237,10 @@ func setQuirks(opt *Options) {
 		useMultipartEtag = false
 		useAlreadyExists = false
 		// useMultipartUploads = false - set this manually
+		// rclone serve doesn't support multi-part server side copy:
+		// See: https://github.com/rclone/rclone/issues/7454
+		// So make cutoff very large which it does support
+		opt.CopyCutoff = math.MaxInt64
 	case "Scaleway":
 		// Scaleway can only have 1000 parts in an upload
 		if opt.MaxUploadParts > 1000 {

fstest/fstests/fstests.go

@@ -83,6 +83,7 @@ type SetUploadCutoffer interface {
 type SetCopyCutoffer interface {
 	// Change the configured CopyCutoff.
 	// Will only be called while no transfer is in progress.
+	// Return fs.ErrorNotImplemented if you can't implement this
 	SetCopyCutoff(fs.SizeSuffix) (fs.SizeSuffix, error)
 }
 
@@ -2345,10 +2346,6 @@ func Run(t *testing.T, opt *Opt) {
 				t.Skip("skipping as ChunkedUpload.Skip is set")
 			}
 
-			if strings.HasPrefix(f.Name(), "serves3") || strings.HasPrefix(f.Name(), "TestS3Rclone") {
-				t.Skip("FIXME skip test - see #7454")
-			}
-
 			do, _ := f.(SetCopyCutoffer)
 			if do == nil {
 				t.Skipf("%T does not implement SetCopyCutoff", f)
@@ -2362,6 +2359,13 @@ func Run(t *testing.T, opt *Opt) {
 				minChunkSize = opt.ChunkedUpload.CeilChunkSize(minChunkSize)
 			}
 
+			// Test setting the copy cutoff before we get going
+			_, err := do.SetCopyCutoff(minChunkSize)
+			if errors.Is(err, fs.ErrorNotImplemented) {
+				t.Skipf("%T does not support SetCopyCutoff: %v", f, err)
+			}
+			require.NoError(t, err)
+
 			chunkSizes := fs.SizeSuffixList{
 				minChunkSize,
 				minChunkSize + 1,