parse yes/no/on/off as string

kvmd/yamlconf/loader.py

@@ -27,6 +27,8 @@ from typing import Any
 
 import yaml
 import yaml.nodes
+import yaml.resolver
+import yaml.constructor
 
 from .. import tools
 
@@ -41,6 +43,7 @@ def load_yaml_file(path: str) -> Any:
             raise ValueError(f"Invalid YAML in the file {path!r}:\n{tools.efmt(err)}") from None
 
 
+# =====
 class _YamlLoader(yaml.SafeLoader):
     def __init__(self, yaml_file: IO) -> None:
         super().__init__(yaml_file)
@@ -52,3 +55,20 @@ class _YamlLoader(yaml.SafeLoader):
 
 
 _YamlLoader.add_constructor("!include", _YamlLoader.include)
+
+
+# =====
+def _disable_some_bools() -> None:
+    # https://stackoverflow.com/questions/36463531
+    resolvers = yaml.resolver.Resolver.yaml_implicit_resolvers
+    for key in "oOyYnN":
+        resolvers[key] = [
+            resolver
+            for resolver in resolvers[key]
+            if resolver[0] != "tag:yaml.org,2002:bool"
+        ]
+        if len(resolvers) == 0:
+            del resolvers[key]
+
+
+_disable_some_bools()

testenv/tests/test_yamlconf.py

@@ -0,0 +1,42 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main PiKVM daemon.                                           #
+#                                                                            #
+#    Copyright (C) 2018-2021  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import pathlib
+import textwrap
+
+from kvmd.yamlconf.loader import load_yaml_file
+
+
+# =====
+def test_load_yaml_file__bools(tmp_path: pathlib.Path) -> None:  # type: ignore
+    pobj = tmp_path / "test.yaml"
+    pobj.write_text(textwrap.dedent("""
+        a: true
+        b: false
+        c: yes
+        d: no
+    """))
+    data = load_yaml_file(str(pobj))
+    assert data["a"] is True
+    assert data["b"] is False
+    assert data["c"] == "yes"
+    assert data["d"] == "no"