fix: Internal error in CLI, when the base_url is an invalid IPv6

Ref: #890

docs/changelog.rst

@@ -4,6 +4,10 @@ Changelog
 `Unreleased`_ - TBD
 -------------------
 
+**Fixed**
+
+- Internal error in CLI, when the ``base_url`` is an invalid IPv6. `#890`_
+
 `2.8.1`_ - 2020-11-24
 ---------------------
 
@@ -1542,6 +1546,7 @@ Deprecated
 .. _0.3.0: https://github.com/schemathesis/schemathesis/compare/v0.2.0...v0.3.0
 .. _0.2.0: https://github.com/schemathesis/schemathesis/compare/v0.1.0...v0.2.0
 
+.. _#890: https://github.com/schemathesis/schemathesis/issues/890
 .. _#882: https://github.com/schemathesis/schemathesis/issues/882
 .. _#877: https://github.com/schemathesis/schemathesis/issues/877
 .. _#876: https://github.com/schemathesis/schemathesis/issues/876

src/schemathesis/cli/callbacks.py

@@ -35,7 +35,11 @@ def _validate_url(value: str) -> None:
 
 
 def validate_base_url(ctx: click.core.Context, param: click.core.Parameter, raw_value: str) -> str:
-    if raw_value and not urlparse(raw_value).netloc:
+    try:
+        netloc = urlparse(raw_value).netloc
+    except ValueError as exc:
+        raise click.UsageError("Invalid base URL") from exc
+    if raw_value and not netloc:
         raise click.UsageError("Invalid base URL")
     return raw_value
 

test/cli/test_crashes.py

@@ -103,6 +103,7 @@ def test_valid_parameters_combos(cli, schema_url, params, flags, multiple_params
 @settings(deadline=None)
 @given(schema=urls() | paths() | st.text(), base_url=urls() | paths() | st.text() | st.none())
 @example(schema="//bla", base_url=None)
+@example(schema="http://127.0.0.1/schema.yaml", base_url="//ÿ[")
 @pytest.mark.usefixtures("mocked_schema")
 def test_schema_validity(cli, schema, base_url):
     args = ()