Add format dduf (#793)

* feat: add support for DDUF format in backend and client handling

* deprecate diffusers format (use dduf instead)

Author: ilopezluna

cmd/cli/search/backend_resolution.go

@@ -95,7 +95,7 @@ func backendFromFormat(format disttypes.Format) string {
 		return backendLlamaCpp
 	case disttypes.FormatSafetensors:
 		return backendVLLM
-	case disttypes.FormatDiffusers:
+	case disttypes.FormatDDUF, disttypes.FormatDiffusers: //nolint:staticcheck // FormatDiffusers kept for backward compatibility
 		return backendDiffusers
 	default:
 		return backendUnknown

cmd/cli/search/backend_resolution_test.go

@@ -20,7 +20,8 @@ func TestBackendFromFormat(t *testing.T) {
 	}{
 		{name: "gguf", format: disttypes.FormatGGUF, want: backendLlamaCpp},
 		{name: "safetensors", format: disttypes.FormatSafetensors, want: backendVLLM},
-		{name: "diffusers", format: disttypes.FormatDiffusers, want: backendDiffusers},
+		{name: "dduf", format: disttypes.FormatDDUF, want: backendDiffusers},
+		{name: "diffusers (deprecated)", format: disttypes.FormatDiffusers, want: backendDiffusers}, //nolint:staticcheck // FormatDiffusers kept for backward compatibility
 		{name: "unknown", format: "", want: backendUnknown},
 	}
 

pkg/distribution/builder/from_directory.go

@@ -163,7 +163,7 @@ func FromDirectory(dirPath string, opts ...DirectoryOption) (*Builder, error) {
 			weightFiles = append(weightFiles, path)
 		case files.FileTypeDDUF:
 			if detectedFormat == "" {
-				detectedFormat = types.FormatDiffusers
+				detectedFormat = types.FormatDDUF
 			}
 			weightFiles = append(weightFiles, path)
 		case files.FileTypeUnknown, files.FileTypeConfig, files.FileTypeLicense, files.FileTypeChatTemplate:

pkg/distribution/format/dduf.go

@@ -20,7 +20,7 @@ func init() {
 
 // Name returns the format identifier for DDUF.
 func (d *DDUFFormat) Name() types.Format {
-	return types.FormatDiffusers
+	return types.FormatDDUF
 }
 
 // MediaType returns the OCI media type for DDUF layers.
@@ -39,7 +39,7 @@ func (d *DDUFFormat) DiscoverShards(path string) ([]string, error) {
 // DDUF files are zip archives containing model config, so we extract what we can.
 func (d *DDUFFormat) ExtractConfig(paths []string) (types.Config, error) {
 	if len(paths) == 0 {
-		return types.Config{Format: types.FormatDiffusers}, nil
+		return types.Config{Format: types.FormatDDUF}, nil
 	}
 
 	// Calculate total size across all files
@@ -59,7 +59,7 @@ func (d *DDUFFormat) ExtractConfig(paths []string) (types.Config, error) {
 	// In the future, we could extract model_index.json from the DDUF archive
 	// to get architecture details, etc.
 	return types.Config{
-		Format:       types.FormatDiffusers,
+		Format:       types.FormatDDUF,
 		Architecture: "diffusers",
 		Size:         formatSize(totalSize),
 		Diffusers: map[string]string{

pkg/distribution/format/format.go

@@ -62,7 +62,7 @@ func DetectFromPath(path string) (Format, error) {
 	case files.FileTypeSafetensors:
 		return Get(types.FormatSafetensors)
 	case files.FileTypeDDUF:
-		return Get(types.FormatDiffusers)
+		return Get(types.FormatDDUF)
 	case files.FileTypeUnknown, files.FileTypeConfig, files.FileTypeLicense, files.FileTypeChatTemplate:
 		return nil, fmt.Errorf("unable to detect format from path: %s (file type: %s)", utils.SanitizeForLog(path), ft)
 	}

pkg/distribution/internal/bundle/unpack.go

@@ -62,7 +62,7 @@ func unpackLegacy(dir string, model types.Model) (*Bundle, error) {
 		if err := unpackSafetensors(bundle, model); err != nil {
 			return nil, fmt.Errorf("unpack safetensors files: %w", err)
 		}
-	case types.FormatDiffusers:
+	case types.FormatDiffusers, types.FormatDDUF: //nolint:staticcheck // FormatDiffusers kept for backward compatibility
 		if err := unpackDDUF(bundle, model); err != nil {
 			return nil, fmt.Errorf("unpack DDUF file: %w", err)
 		}
@@ -124,7 +124,7 @@ func detectModelFormat(model types.Model) types.Format {
 	// Check for DDUF files
 	ddufPaths, err := model.DDUFPaths()
 	if err == nil && len(ddufPaths) > 0 {
-		return types.FormatDiffusers
+		return types.FormatDDUF
 	}
 
 	return ""

pkg/distribution/modelpack/types.go

@@ -232,8 +232,10 @@ func (m *Model) GetFormat() types.Format {
 		return types.FormatGGUF
 	case "safetensors":
 		return types.FormatSafetensors
+	case "dduf":
+		return types.FormatDDUF
 	case "diffusers":
-		return types.FormatDiffusers
+		return types.FormatDiffusers //nolint:staticcheck // FormatDiffusers kept for backward compatibility
 	default:
 		return types.Format(f)
 	}

pkg/distribution/types/config.go

@@ -50,7 +50,10 @@ const (
 
 	FormatGGUF        = Format("gguf")
 	FormatSafetensors = Format("safetensors")
-	FormatDiffusers   = Format("diffusers")
+	FormatDDUF        = Format("dduf")
+	// Deprecated: FormatDiffusers is kept for backward compatibility with models
+	// that have "format": "diffusers" in their config. Use FormatDDUF instead.
+	FormatDiffusers = Format("diffusers")
 
 	// OCI Annotation keys for model layers
 	// See https://github.com/opencontainers/image-spec/blob/main/annotations.md