Avoid displaying upgrade warning when installation is not pip

.github/workflows/tox.yml

@@ -72,7 +72,7 @@ jobs:
     env:
       # Number of expected test passes, safety measure for accidental skip of
       # tests. Update value if you add/remove tests.
-      PYTEST_REQPASS: 874
+      PYTEST_REQPASS: 875
     steps:
       - uses: actions/checkout@v4
         with:

src/ansiblelint/config.py

@@ -292,6 +292,11 @@ def get_version_warning() -> str:
     # 0.1dev1 is special fallback version
     if __version__ == "0.1.dev1":  # pragma: no cover
         return ""
+    pip = guess_install_method()
+    # If we do not know how to upgrade, we do not want to show any warnings
+    # about version.
+    if not pip:
+        return ""
 
     msg = ""
     data = {}
@@ -332,9 +337,6 @@ def get_version_warning() -> str:
         msg = "[dim]You are using a pre-release version of ansible-lint.[/]"
     elif current_version < new_version:
         msg = f"""[warning]A new release of ansible-lint is available: [red]{current_version}[/] → [green][link={html_url}]{new_version}[/][/][/]"""
-
-        pip = guess_install_method()
-        if pip:
-            msg += f" Upgrade by running: [info]{pip}[/]"
+        msg += f" Upgrade by running: [info]{pip}[/]"
 
     return msg

test/test_main.py

@@ -86,6 +86,12 @@ def test_get_version_warning(
     assert len(msg.split("\n")) == outlen
 
 
+def test_get_version_warning_no_pip(mocker: MockerFixture) -> None:
+    """Test that we do not display any message if install method is not pip."""
+    mocker.patch("ansiblelint.config.guess_install_method", return_value="")
+    assert get_version_warning() == ""
+
+
 @pytest.mark.parametrize(
     ("lintable"),
     (