Report keyfiles that were found but failed import

cmd/fluxd/main.go

@@ -200,7 +200,8 @@ func main() {
 		keyfiles, err := gpg.ImportKeys(*gitImportGPG)
 		if err != nil {
 			logger.Log("error", "failed to import GPG keys", "err", err.Error())
-		} else {
+		}
+		if keyfiles != nil {
 			logger.Log("info", "imported GPG keys", "files", fmt.Sprintf("%v", keyfiles))
 		}
 	}

gpg/gpg.go

@@ -40,15 +40,20 @@ func ImportKeys(src string) ([]string, error) {
 		files = []string{src}
 	}
 
-
 	var imported []string
+	var failed []string
 	for _, path := range files {
 		if err := gpgImport(path); err != nil {
+			failed = append(failed, filepath.Base(path))
 			continue
 		}
 		imported = append(imported, filepath.Base(path))
 	}
 
+	if failed != nil {
+		return imported, fmt.Errorf("errored importing keys: %v", failed)
+	}
+
 	return imported, nil
 }