Configuration files may now also be stored under sys.prefix (#6268)

* Rename kinds.VENV to kinds.SITE and site_config_files to global_config_files
* Add tests for config file options
* Deprecate --venv in pip config

news/5060.feature

@@ -0,0 +1 @@
+Configuration files may now also be stored under ``sys.prefix``

src/pip/_internal/commands/configuration.py

@@ -6,7 +6,8 @@
 from pip._internal.cli.status_codes import ERROR, SUCCESS
 from pip._internal.configuration import Configuration, kinds
 from pip._internal.exceptions import PipError
-from pip._internal.locations import venv_config_file
+from pip._internal.locations import running_under_virtualenv, site_config_file
+from pip._internal.utils.deprecation import deprecated
 from pip._internal.utils.misc import get_prog
 
 logger = logging.getLogger(__name__)
@@ -23,7 +24,7 @@ class ConfigurationCommand(Command):
         set: Set the name=value
         unset: Unset the value associated with name
 
-        If none of --user, --global and --venv are passed, a virtual
+        If none of --user, --global and --site are passed, a virtual
         environment configuration file is used if one is active and the file
         exists. Otherwise, all modifications happen on the to the user file by
         default.
@@ -73,12 +74,23 @@ def __init__(self, *args, **kwargs):
             help='Use the user configuration file only'
         )
 
+        self.cmd_opts.add_option(
+            '--site',
+            dest='site_file',
+            action='store_true',
+            default=False,
+            help='Use the current environment configuration file only'
+        )
+
         self.cmd_opts.add_option(
             '--venv',
             dest='venv_file',
             action='store_true',
             default=False,
-            help='Use the virtualenv configuration file only'
+            help=(
+                '[Deprecated] Use the current environment configuration '
+                'file in a virtual environment only'
+            )
         )
 
         self.parser.insert_option_group(0, self.cmd_opts)
@@ -127,27 +139,41 @@ def run(self, options, args):
         return SUCCESS
 
     def _determine_file(self, options, need_value):
-        file_options = {
-            kinds.USER: options.user_file,
-            kinds.GLOBAL: options.global_file,
-            kinds.VENV: options.venv_file
-        }
-
-        if sum(file_options.values()) == 0:
+        # Convert legacy venv_file option to site_file or error
+        if options.venv_file and not options.site_file:
+            if running_under_virtualenv():
+                options.site_file = True
+                deprecated(
+                    "The --venv option has been deprecated.",
+                    replacement="--site",
+                    gone_in="19.3",
+                )
+            else:
+                raise PipError(
+                    "Legacy --venv option requires a virtual environment. "
+                    "Use --site instead."
+                )
+
+        file_options = [key for key, value in (
+            (kinds.USER, options.user_file),
+            (kinds.GLOBAL, options.global_file),
+            (kinds.SITE, options.site_file),
+        ) if value]
+
+        if not file_options:
             if not need_value:
                 return None
-            # Default to user, unless there's a virtualenv file.
-            elif os.path.exists(venv_config_file):
-                return kinds.VENV
+            # Default to user, unless there's a site file.
+            elif os.path.exists(site_config_file):
+                return kinds.SITE
             else:
                 return kinds.USER
-        elif sum(file_options.values()) == 1:
-            # There's probably a better expression for this.
-            return [key for key in file_options if file_options[key]][0]
+        elif len(file_options) == 1:
+            return file_options[0]
 
         raise PipError(
             "Need exactly one file to operate upon "
-            "(--user, --venv, --global) to perform."
+            "(--user, --site, --global) to perform."
         )
 
     def list_values(self, options, args):

src/pip/_internal/configuration.py

@@ -21,8 +21,7 @@
     ConfigurationError, ConfigurationFileCouldNotBeLoaded,
 )
 from pip._internal.locations import (
-    legacy_config_file, new_config_file, running_under_virtualenv,
-    site_config_files, venv_config_file,
+    global_config_files, legacy_config_file, new_config_file, site_config_file,
 )
 from pip._internal.utils.misc import ensure_dir, enum
 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
@@ -58,7 +57,7 @@ def _disassemble_key(name):
 kinds = enum(
     USER="user",        # User Specific
     GLOBAL="global",    # System Wide
-    VENV="venv",        # Virtual Environment Specific
+    SITE="site",        # [Virtual] Environment Specific
     ENV="env",          # from PIP_CONFIG_FILE
     ENV_VAR="env-var",  # from Environment Variables
 )
@@ -82,7 +81,7 @@ def __init__(self, isolated, load_only=None):
         # type: (bool, Kind) -> None
         super(Configuration, self).__init__()
 
-        _valid_load_only = [kinds.USER, kinds.GLOBAL, kinds.VENV, None]
+        _valid_load_only = [kinds.USER, kinds.GLOBAL, kinds.SITE, None]
         if load_only not in _valid_load_only:
             raise ConfigurationError(
                 "Got invalid value for load_only - should be one of {}".format(
@@ -94,7 +93,7 @@ def __init__(self, isolated, load_only=None):
 
         # The order here determines the override order.
         self._override_order = [
-            kinds.GLOBAL, kinds.USER, kinds.VENV, kinds.ENV, kinds.ENV_VAR
+            kinds.GLOBAL, kinds.USER, kinds.SITE, kinds.ENV, kinds.ENV_VAR
         ]
 
         self._ignore_env_names = ["version", "help"]
@@ -351,7 +350,7 @@ def _iter_config_files(self):
             yield kinds.ENV, []
 
         # at the base we have any global configuration
-        yield kinds.GLOBAL, list(site_config_files)
+        yield kinds.GLOBAL, list(global_config_files)
 
         # per-user configuration next
         should_load_user_config = not self.isolated and not (
@@ -362,8 +361,7 @@ def _iter_config_files(self):
             yield kinds.USER, [legacy_config_file, new_config_file]
 
         # finally virtualenv configuration first trumping others
-        if running_under_virtualenv():
-            yield kinds.VENV, [venv_config_file]
+        yield kinds.SITE, [site_config_file]
 
     def _get_parser_to_modify(self):
         # type: () -> Tuple[str, RawConfigParser]

src/pip/_internal/locations.py

@@ -135,12 +135,12 @@ def virtualenv_no_global():
     if sys.platform[:6] == 'darwin' and sys.prefix[:16] == '/System/Library/':
         bin_py = '/usr/local/bin'
 
-site_config_files = [
+global_config_files = [
     os.path.join(path, config_basename)
     for path in appdirs.site_config_dirs('pip')
 ]
 
-venv_config_file = os.path.join(sys.prefix, config_basename)
+site_config_file = os.path.join(sys.prefix, config_basename)
 new_config_file = os.path.join(appdirs.user_config_dir("pip"), config_basename)
 
 

tests/unit/test_configuration.py

@@ -8,7 +8,7 @@
 
 from pip._internal.exceptions import ConfigurationError
 from pip._internal.locations import (
-    new_config_file, site_config_files, venv_config_file,
+    global_config_files, new_config_file, site_config_file,
 )
 from tests.lib.configuration_helpers import ConfigurationMixin, kinds
 
@@ -27,8 +27,8 @@ def test_user_loading(self):
         self.configuration.load()
         assert self.configuration.get_value("test.hello") == "2"
 
-    def test_venv_loading(self):
-        self.patch_configuration(kinds.VENV, {"test.hello": "3"})
+    def test_site_loading(self):
+        self.patch_configuration(kinds.SITE, {"test.hello": "3"})
 
         self.configuration.load()
         assert self.configuration.get_value("test.hello") == "3"
@@ -90,8 +90,8 @@ class TestConfigurationPrecedence(ConfigurationMixin):
     # Tests for methods to that determine the order of precedence of
     # configuration options
 
-    def test_env_overides_venv(self):
-        self.patch_configuration(kinds.VENV, {"test.hello": "1"})
+    def test_env_overides_site(self):
+        self.patch_configuration(kinds.SITE, {"test.hello": "1"})
         self.patch_configuration(kinds.ENV, {"test.hello": "0"})
         self.configuration.load()
 
@@ -111,16 +111,16 @@ def test_env_overides_global(self):
 
         assert self.configuration.get_value("test.hello") == "0"
 
-    def test_venv_overides_user(self):
+    def test_site_overides_user(self):
         self.patch_configuration(kinds.USER, {"test.hello": "2"})
-        self.patch_configuration(kinds.VENV, {"test.hello": "1"})
+        self.patch_configuration(kinds.SITE, {"test.hello": "1"})
         self.configuration.load()
 
         assert self.configuration.get_value("test.hello") == "1"
 
-    def test_venv_overides_global(self):
+    def test_site_overides_global(self):
         self.patch_configuration(kinds.GLOBAL, {"test.hello": "3"})
-        self.patch_configuration(kinds.VENV, {"test.hello": "1"})
+        self.patch_configuration(kinds.SITE, {"test.hello": "1"})
         self.configuration.load()
 
         assert self.configuration.get_value("test.hello") == "1"
@@ -141,8 +141,8 @@ def test_env_not_overriden_by_environment_var(self):
         assert self.configuration.get_value("test.hello") == "1"
         assert self.configuration.get_value(":env:.hello") == "5"
 
-    def test_venv_not_overriden_by_environment_var(self):
-        self.patch_configuration(kinds.VENV, {"test.hello": "2"})
+    def test_site_not_overriden_by_environment_var(self):
+        self.patch_configuration(kinds.SITE, {"test.hello": "2"})
         os.environ["PIP_HELLO"] = "5"
 
         self.configuration.load()
@@ -182,8 +182,8 @@ def test_no_specific_given_modification(self):
         else:
             assert False, "Should have raised an error."
 
-    def test_venv_modification(self):
-        self.configuration.load_only = kinds.VENV
+    def test_site_modification(self):
+        self.configuration.load_only = kinds.SITE
         self.configuration.load()
 
         # Mock out the method
@@ -192,9 +192,9 @@ def test_venv_modification(self):
 
         self.configuration.set_value("test.hello", "10")
 
-        # get the path to venv config file
+        # get the path to site config file
         assert mymock.call_count == 1
-        assert mymock.call_args[0][0] == venv_config_file
+        assert mymock.call_args[0][0] == site_config_file
 
     def test_user_modification(self):
         # get the path to local config file
@@ -224,4 +224,4 @@ def test_global_modification(self):
 
         # get the path to user config file
         assert mymock.call_count == 1
-        assert mymock.call_args[0][0] == site_config_files[-1]
+        assert mymock.call_args[0][0] == global_config_files[-1]

tests/unit/test_options.py

@@ -5,7 +5,8 @@
 
 import pip._internal.configuration
 from pip._internal import main
-from pip._internal.commands import DownloadCommand
+from pip._internal.commands import ConfigurationCommand, DownloadCommand
+from pip._internal.exceptions import PipError
 from tests.lib.options_helpers import AddFakeCommandMixin
 
 
@@ -383,23 +384,62 @@ def test_client_cert(self):
 class TestOptionsConfigFiles(object):
 
     def test_venv_config_file_found(self, monkeypatch):
-        # strict limit on the site_config_files list
+        # strict limit on the global_config_files list
         monkeypatch.setattr(
-            pip._internal.configuration, 'site_config_files', ['/a/place']
+            pip._internal.configuration, 'global_config_files', ['/a/place']
         )
 
-        # If we are running in a virtualenv and all files appear to exist,
-        # we should see two config files.
-        monkeypatch.setattr(
-            pip._internal.configuration,
-            'running_under_virtualenv',
-            lambda: True,
-        )
-        monkeypatch.setattr(os.path, 'exists', lambda filename: True)
         cp = pip._internal.configuration.Configuration(isolated=False)
 
         files = []
         for _, val in cp._iter_config_files():
             files.extend(val)
 
         assert len(files) == 4
+
+    @pytest.mark.parametrize(
+        "args, expect",
+        (
+            ([], None),
+            (["--global"], "global"),
+            (["--site"], "site"),
+            (["--user"], "user"),
+            (["--global", "--user"], PipError),
+            (["--global", "--site"], PipError),
+            (["--global", "--site", "--user"], PipError),
+        )
+    )
+    def test_config_file_options(self, monkeypatch, args, expect):
+        cmd = ConfigurationCommand()
+        # Replace a handler with a no-op to avoid side effects
+        monkeypatch.setattr(cmd, "get_name", lambda *a: None)
+
+        options, args = cmd.parser.parse_args(args + ["get", "name"])
+        if expect is PipError:
+            with pytest.raises(PipError):
+                cmd._determine_file(options, need_value=False)
+        else:
+            assert expect == cmd._determine_file(options, need_value=False)
+
+    def test_config_file_venv_option(self, monkeypatch):
+        cmd = ConfigurationCommand()
+        # Replace a handler with a no-op to avoid side effects
+        monkeypatch.setattr(cmd, "get_name", lambda *a: None)
+
+        collected_warnings = []
+
+        def _warn(message, *a, **kw):
+            collected_warnings.append(message)
+        monkeypatch.setattr("warnings.warn", _warn)
+
+        options, args = cmd.parser.parse_args(["--venv", "get", "name"])
+        assert "site" == cmd._determine_file(options, need_value=False)
+        assert collected_warnings
+        assert "--site" in collected_warnings[0]
+
+        # No warning or error if both "--venv" and "--site" are specified
+        collected_warnings[:] = []
+        options, args = cmd.parser.parse_args(["--venv", "--site", "get",
+                                               "name"])
+        assert "site" == cmd._determine_file(options, need_value=False)
+        assert not collected_warnings