pip config normalizes names, converting underscores into dashes

docs/html/development/contributing.rst

@@ -88,7 +88,7 @@ The contents of this file are reStructuredText formatted text that
 will be used as the content of the news file entry. You do not need to
 reference the issue or PR numbers in the entry, since ``towncrier``
 will automatically add a reference to all of the affected issues when
-rendering the NEWS file.
+rendering the NEWS file. There must be a newline at the end of the file.
 
 In order to maintain a consistent style in the ``NEWS.rst`` file, it is
 preferred to keep the news entry to the point, in sentence case, shorter than

news/9330.bugfix.rst

@@ -0,0 +1 @@
+``pip config`` now normalizes names by converting underscores into dashes.

src/pip/_internal/configuration.py

@@ -142,13 +142,19 @@ def items(self) -> Iterable[Tuple[str, Any]]:
 
     def get_value(self, key: str) -> Any:
         """Get a value from the configuration."""
+        orig_key = key
+        key = _normalize_name(key)
         try:
             return self._dictionary[key]
         except KeyError:
-            raise ConfigurationError(f"No such key - {key}")
+            # disassembling triggers a more useful error message than simply
+            # "No such key" in the case that the key isn't in the form command.option
+            _disassemble_key(key)
+            raise ConfigurationError(f"No such key - {orig_key}")
 
     def set_value(self, key: str, value: Any) -> None:
         """Modify a value in the configuration."""
+        key = _normalize_name(key)
         self._ensure_have_load_only()
 
         assert self.load_only
@@ -167,11 +173,13 @@ def set_value(self, key: str, value: Any) -> None:
 
     def unset_value(self, key: str) -> None:
         """Unset a value in the configuration."""
+        orig_key = key
+        key = _normalize_name(key)
         self._ensure_have_load_only()
 
         assert self.load_only
         if key not in self._config[self.load_only]:
-            raise ConfigurationError(f"No such key - {key}")
+            raise ConfigurationError(f"No such key - {orig_key}")
 
         fname, parser = self._get_parser_to_modify()
 

tests/unit/test_configuration.py

@@ -1,6 +1,7 @@
 """Tests for all things related to the configuration
 """
 
+import re
 from unittest.mock import MagicMock
 
 import pytest
@@ -87,6 +88,25 @@ def test_environment_config_errors_if_malformed(
             err.value
         )
 
+    def test_no_such_key_error_message_no_command(self) -> None:
+        self.configuration.load_only = kinds.GLOBAL
+        self.configuration.load()
+        expected_msg = (
+            "Key does not contain dot separated section and key. "
+            "Perhaps you wanted to use 'global.index-url' instead?"
+        )
+        pat = f"^{re.escape(expected_msg)}$"
+        with pytest.raises(ConfigurationError, match=pat):
+            self.configuration.get_value("index-url")
+
+    def test_no_such_key_error_message_missing_option(self) -> None:
+        self.configuration.load_only = kinds.GLOBAL
+        self.configuration.load()
+        expected_msg = "No such key - global.index-url"
+        pat = f"^{re.escape(expected_msg)}$"
+        with pytest.raises(ConfigurationError, match=pat):
+            self.configuration.get_value("global.index-url")
+
 
 class TestConfigurationPrecedence(ConfigurationMixin):
     # Tests for methods to that determine the order of precedence of
@@ -185,12 +205,8 @@ class TestConfigurationModification(ConfigurationMixin):
     def test_no_specific_given_modification(self) -> None:
         self.configuration.load()
 
-        try:
+        with pytest.raises(ConfigurationError):
             self.configuration.set_value("test.hello", "10")
-        except ConfigurationError:
-            pass
-        else:
-            assert False, "Should have raised an error."
 
     def test_site_modification(self) -> None:
         self.configuration.load_only = kinds.SITE
@@ -241,3 +257,16 @@ def test_global_modification(self) -> None:
         # get the path to user config file
         assert mymock.call_count == 1
         assert mymock.call_args[0][0] == (get_configuration_files()[kinds.GLOBAL][-1])
+
+    def test_normalization(self) -> None:
+        # underscores and dashes can be used interchangeably.
+        # internally, underscores get converted into dashes before reading/writing file
+        self.configuration.load_only = kinds.GLOBAL
+        self.configuration.load()
+        self.configuration.set_value("global.index_url", "example.org")
+        assert self.configuration.get_value("global.index_url") == "example.org"
+        assert self.configuration.get_value("global.index-url") == "example.org"
+        self.configuration.unset_value("global.index-url")
+        pat = r"^No such key - global\.index-url$"
+        with pytest.raises(ConfigurationError, match=pat):
+            self.configuration.get_value("global.index-url")