clean yaml error message

kvmd/apps/__init__.py

@@ -161,9 +161,12 @@ def init(
 # =====
 def _init_config(config_path: str, override_options: List[str], **load_flags: bool) -> Section:
     config_path = os.path.expanduser(config_path)
-    raw_config: Dict = load_yaml_file(config_path)
+    try:
+        raw_config: Dict = load_yaml_file(config_path)
+    except Exception as err:
+        raise SystemExit(f"ConfigError: Can't read config file {config_path!r}:\n{tools.efmt(err)}")
     if not isinstance(raw_config, dict):
-        raise SystemExit(f"Config error: Top-level of the file {config_path!r} must be a dictionary")
+        raise SystemExit(f"ConfigError: Top-level of the file {config_path!r} must be a dictionary")
 
     scheme = _get_config_scheme()
     try:
@@ -177,7 +180,7 @@ def _init_config(config_path: str, override_options: List[str], **load_flags: bo
 
         return config
     except (ConfigError, UnknownPluginError) as err:
-        raise SystemExit(f"Config error: {err}")
+        raise SystemExit(f"ConfigError: {err}")
 
 
 def _patch_raw(raw_config: Dict) -> None:

kvmd/yamlconf/loader.py

@@ -28,15 +28,17 @@ from typing import Any
 import yaml
 import yaml.nodes
 
+from .. import tools
+
 
 # =====
 def load_yaml_file(path: str) -> Any:
     with open(path) as yaml_file:
         try:
             return yaml.load(yaml_file, _YamlLoader)
-        except Exception:
+        except Exception as err:
             # Reraise internal exception as standard ValueError and show the incorrect file
-            raise ValueError(f"Incorrect YAML syntax in file {path!r}")
+            raise ValueError(f"Invalid YAML in the file {path!r}:\n{tools.efmt(err)}") from None
 
 
 class _YamlLoader(yaml.SafeLoader):

testenv/tests/apps/htpasswd/test_main.py

@@ -158,7 +158,7 @@ def test_fail__not_htpasswd() -> None:
 
 
 def test_fail__unknown_plugin() -> None:
-    with pytest.raises(SystemExit, match="Config error: Unknown plugin 'auth/foobar'"):
+    with pytest.raises(SystemExit, match="ConfigError: Unknown plugin 'auth/foobar'"):
         _run_htpasswd(["list"], "", internal_type="foobar")