fix: report a malformed Redis URL instead of raising from urlsplit

urlsplit raises ValueError on input such as redis://[::1 , which nothing
converted, so a typo left native setup with a traceback rather than the message
every other unusable URL gets.

docsgpt/deploy/commands.py

@@ -209,7 +209,11 @@ def _redis_urls(base: str) -> dict[str, str]:
     Everything else in the URL is kept — TLS, credentials, and query parameters such as the
     ``ssl_cert_reqs`` that a rediss:// endpoint usually needs.
     """
-    parts = urlsplit(base)
+    try:
+        parts = urlsplit(base)
+    except ValueError as exc:
+        # urlsplit raises on things like redis://[::1 ; that is a typo, not a crash.
+        raise DeployError(f"the Redis URL {base!r} could not be read: {exc}") from exc
     if parts.scheme not in ("redis", "rediss"):
         raise DeployError(
             f"the Redis URL {base!r} should start with redis:// or rediss://, with any options as "

tests/deploy/test_native.py

@@ -200,6 +200,22 @@ class TestNativeUp:
         assert env["CELERY_BROKER_URL"] == "redis://localhost:6379/0?health_check_interval=30"
         assert env["CACHE_REDIS_URL"] == "redis://localhost:6379/2?health_check_interval=30"
 
+    def test_a_malformed_redis_url_is_reported_not_raised(self, tmp_path):
+        """urlsplit raises ValueError on an unterminated IPv6 bracket; a typo is not a traceback."""
+        argv = ["up", "--native", "--dir", str(tmp_path), "--yes",
+                "--postgres-uri", "postgresql://localhost/d", "--redis-url", "redis://[::1"]
+        with pytest.raises(DeployError, match="could not be read"):
+            _run(argv, _native_context())
+
+    def test_an_ipv6_redis_url_still_works(self, tmp_path):
+        """Refusing the malformed form must not cost the valid one."""
+        argv = ["up", "--native", "--dir", str(tmp_path), "--yes", "--postgres-uri", "postgresql://localhost/d",
+                "--redis-url", "redis://[::1]:6379/2"]
+        assert _run(argv, _native_context()) == 0
+        env = envfile.read(tmp_path / ".env")
+        assert env["CELERY_BROKER_URL"] == "redis://[::1]:6379/2"
+        assert env["CACHE_REDIS_URL"] == "redis://[::1]:6379/4"
+
     @pytest.mark.parametrize("url", ["localhost:6379", "redis+socket:///var/run/redis.sock",
                                      "redis://localhost:6379/queue"])
     def test_a_redis_url_that_cannot_be_numbered_is_refused(self, tmp_path, url):