Warn users who try to use pipenv run before installing packages

pipenv/cli.py

@@ -2241,7 +2241,17 @@ def inline_activate_virtualenv():
 @click.option('--three/--two', is_flag=True, default=None, help="Use Python 3/2 when creating virtualenv.")
 @click.option('--python', default=False, nargs=1, help="Specify which version of Python virtualenv should use.")
 def run(command, args, three=None, python=False):
-    # Ensure that virtualenv is available.
+    # Make sure we have created the virtualenv if applicable
+    # This isn't required if we are in CI or are using system python
+    if not project.virtualenv_exists and not PIPENV_USE_SYSTEM and not 'CI' in os.environ:
+        click.echo(
+            u'This project has no virtualenv yet! Use $ {0}, for example, to create one.'.format(
+                crayons.red(u'pipenv install', bold=True)
+            ),
+            err=True
+        )
+        sys.exit(1)
+
     ensure_project(three=three, python=python, validate=False)
 
     load_dot_env()

pipenv/utils.py

@@ -843,7 +843,10 @@ def is_installable_file(path):
         path = urlparse(path['file']).path if 'file' in path else path['path']
     if not isinstance(path, six.string_types) or path == '*':
         return False
-    lookup_path = Path(path)
+    try:
+        lookup_path = Path(path)
+    except OSError:
+        return False
     return lookup_path.is_file() or (lookup_path.is_dir() and
             pip.utils.is_installable_dir(lookup_path.resolve().as_posix()))
 

tests/test_pipenv.py

@@ -598,15 +598,33 @@ def test_shell_nested_venv_in_project(self):
     @pytest.mark.run
     @pytest.mark.dotenv
     def test_env(self):
-
         with PipenvInstance(pipfile=False) as p:
+            p.pipenv('install')
             with open('.env', 'w') as f:
                 f.write('HELLO=WORLD')
 
             c = p.pipenv('run python -c "import os; print(os.environ[\'HELLO\'])"')
             assert c.return_code == 0
             assert 'WORLD' in c.out
 
+    @pytest.mark.run
+    @pytest.mark.cli
+    def test_run_before_install(self):
+        with temp_environ():
+            # This is designed to work with CI
+            if 'CI' in os.environ:
+                del os.environ['CI']
+            with PipenvInstance() as p:
+                with open(p.pipfile_path, 'w') as f:
+                    contents = """
+[packages]
+requests = "*"
+                    """.strip()
+                    f.write(contents)
+                c = p.pipenv('run python -c "print(\'hello\')"')
+                assert c.return_code == 1
+                assert 'has no virtualenv' in c.err
+
     @pytest.mark.e
     @pytest.mark.install
     @pytest.mark.skip(reason="this doesn't work on windows")