feat(backends): allow backends to not have a metadata file

In this case we generate one on the fly and we infer the metadata we
can.

Obviously this have the side effect of not being able to register
potential aliases.

Signed-off-by: Ettore Di Giacinto <[email protected]>

Author: mudler

core/gallery/backends.go

@@ -250,16 +250,22 @@ func ListSystemBackends(basePath string) (map[string]string, error) {
 	for _, backend := range backends {
 		if backend.IsDir() {
 			runFile := filepath.Join(basePath, backend.Name(), runFile)
-			// Skip if metadata file don't exist
+
+			var metadata *BackendMetadata
+
+			// If metadata file does not exist, we just use the directory name
+			// and we do not fill the other metadata (such as potential backend Aliases)
 			metadataFilePath := filepath.Join(basePath, backend.Name(), metadataFile)
 			if _, err := os.Stat(metadataFilePath); os.IsNotExist(err) {
-				continue
-			}
-
-			// Check for alias in metadata
-			metadata, err := readBackendMetadata(filepath.Join(basePath, backend.Name()))
-			if err != nil {
-				return nil, err
+				metadata = &BackendMetadata{
+					Name: backend.Name(),
+				}
+			} else {
+				// Check for alias in metadata
+				metadata, err = readBackendMetadata(filepath.Join(basePath, backend.Name()))
+				if err != nil {
+					return nil, err
+				}
 			}
 
 			if metadata == nil {