Fix broken pip state

salt/states/pip_state.py

@@ -49,42 +49,35 @@
     HAS_PIP = True
 except ImportError:
     HAS_PIP = False
+    # Remove references to the loaded pip module above so reloading works
+    import sys
+    pip_related_entries = [
+        (k, v) for (k, v) in sys.modules.items()
+        or getattr(v, '__module__', '').startswith('pip.')
+        or (isinstance(v, types.ModuleType) and v.__name__.startswith('pip.'))
+    ]
+    for name, entry in pip_related_entries:
+        sys.modules.pop(name)
+        del entry
+
+    del pip
+    sys_modules_pip = sys.modules.pop('pip', None)
+    if sys_modules_pip is not None:
+        del sys_modules_pip
 
 if HAS_PIP is True:
-    try:
-        from pip.req import InstallRequirement
-        _from_line = InstallRequirement.from_line
-    except ImportError:
-        # pip 10.0.0 move req module under pip._internal
-        try:
-            try:
-                from pip._internal.req import InstallRequirement
-                _from_line = InstallRequirement.from_line
-            except AttributeError:
-                from pip._internal.req.constructors import install_req_from_line as _from_line
-        except ImportError:
-            HAS_PIP = False
-            # Remove references to the loaded pip module above so reloading works
-            import sys
-            pip_related_entries = [
-                (k, v) for (k, v) in sys.modules.items()
-                or getattr(v, '__module__', '').startswith('pip.')
-                or (isinstance(v, types.ModuleType) and v.__name__.startswith('pip.'))
-            ]
-            for name, entry in pip_related_entries:
-                sys.modules.pop(name)
-                del entry
-
-            del pip
-            sys_modules_pip = sys.modules.pop('pip', None)
-            if sys_modules_pip is not None:
-                del sys_modules_pip
-
-    try:
+    if salt.utils.versions.compare(ver1=pip.__version__,
+                                   oper='>=',
+                                   ver2='18.1'):
+        from pip._internal.exceptions import InstallationError
+    elif salt.utils.versions.compare(ver1=pip.__version__,
+                                   oper='>=',
+                                   ver2='10.0'):
         from pip.exceptions import InstallationError
-    except ImportError:
+    else:
         InstallationError = ValueError
 
+
 # pylint: enable=import-error
 
 log = logging.getLogger(__name__)
@@ -93,6 +86,23 @@
 __virtualname__ = 'pip'
 
 
+def _from_line(*args, **kwargs):
+    import pip
+    if salt.utils.versions.compare(ver1=pip.__version__,
+                                   oper='>=',
+                                   ver2='18.1'):
+        import pip._internal.req.constructors
+        return pip._internal.req.constructors.install_req_from_line(*args, **kwargs)
+    elif salt.utils.versions.compare(ver1=pip.__version__,
+                                   oper='>=',
+                                   ver2='10.0'):
+        import pip._internal.req
+        return pip._internal.req.InstallRequirement.from_line(*args, **kwargs)
+    else:
+        import pip.req
+        return pip.req.InstallRequirement.from_line(*args, **kwargs)
+
+
 def __virtual__():
     '''
     Only load if the pip module is available in __salt__

tests/unit/states/test_pip_state.py

@@ -9,6 +9,7 @@
 
 # Import python libs
 from __future__ import absolute_import, print_function, unicode_literals
+import logging
 
 # Import Salt Testing libs
 from tests.support.mixins import LoaderModuleMockMixin, SaltReturnAssertsMixin
@@ -27,6 +28,9 @@
     HAS_PIP = False
 
 
+log = logging.getLogger(__name__)
+
+
 @skipIf(NO_MOCK, NO_MOCK_REASON)
 @skipIf(not HAS_PIP,
         'The \'pip\' library is not importable(installed system-wide)')
@@ -42,6 +46,7 @@ def setup_loader_modules(self):
         }
 
     def test_install_requirements_parsing(self):
+        log.debug("Real pip version is %s", pip.__version__)
         mock = MagicMock(return_value={'retcode': 0, 'stdout': ''})
         pip_list = MagicMock(return_value={'pep8': '1.3.3'})
         pip_version = pip.__version__
@@ -50,19 +55,16 @@ def test_install_requirements_parsing(self):
             with patch.dict(pip_state.__salt__, {'cmd.run_all': mock,
                                                  'pip.list': pip_list}):
                 with patch.dict(pip_state.__opts__, {'test': True}):
-                    if salt.utils.versions.compare(ver1=pip_version,
-                                                   oper='<',
-                                                   ver2='10.0'):
-                        ret = pip_state.installed('pep8=1.3.2')
-                        self.assertSaltFalseReturn({'test': ret})
-                        self.assertInSaltComment(
-                            'Invalid version specification in package pep8=1.3.2. '
-                            '\'=\' is not supported, use \'==\' instead.',
-                            {'test': ret})
-                    else:
-                        self.assertRaises(
-                            pip._internal.exceptions.InstallationError,
-                            pip_state.installed, 'pep=1.3.2')
+                    log.debug(
+                        'pip_state._from_line globals: %s',
+                        [name for name in pip_state._from_line.__globals__]
+                    )
+                    ret = pip_state.installed('pep8=1.3.2')
+                    self.assertSaltFalseReturn({'test': ret})
+                    self.assertInSaltComment(
+                        'Invalid version specification in package pep8=1.3.2. '
+                        '\'=\' is not supported, use \'==\' instead.',
+                        {'test': ret})
 
             mock = MagicMock(return_value={'retcode': 0, 'stdout': ''})
             pip_list = MagicMock(return_value={'pep8': '1.3.3'})