Merge branch 'esp8266-native-library-backend' into esp8266-native-build-spec

esphome/platformio/extra_script.py

@@ -18,8 +18,8 @@ Caveats
 -------
 * Only the ``env.Append`` API is captured. ``env.Replace``,
   ``env.Prepend``, ``env.AddPreAction``, SCons file generators, and any
-  arbitrary I/O are silently no-ops. Scripts that depend on those will
-  produce incomplete output.
+  arbitrary I/O are no-ops, logged once per method. Scripts that depend
+  on those will produce incomplete output.
 * Running arbitrary Python from third-party libraries is a non-trivial
   trust decision. The shim does no sandboxing — anything in the
   script's process can run. Use only with libraries whose source you
@@ -65,12 +65,11 @@ def apply_extra_script(
     library_root = source_path.resolve()
     script_path = (source_path / extra_script).resolve()
     if not script_path.is_relative_to(library_root):
-        _LOGGER.warning(
-            "Ignoring extraScript %s of library %s: it escapes the library directory",
-            extra_script,
-            component.name,
+        # More hostile than a missing script; must not be quieter than it
+        raise EsphomeError(
+            f"extraScript {extra_script} of library {component.name} escapes "
+            "the library directory"
         )
-        return
     if not script_path.is_file():
         # A declared-but-absent script is a broken or half-downloaded
         # package, not an unsupported script; PlatformIO fails on it too
@@ -210,7 +209,7 @@ def run_extra_script(
                 "__name__": "__pio_extra_script__",
             },
         )
-    except Exception as e:  # noqa: BLE001  # pylint: disable=broad-exception-caught
+    except (SystemExit, Exception) as e:  # noqa: BLE001  # pylint: disable=broad-exception-caught
         # Discard any partial capture: folding half a script's flags into the
         # build could produce wrong-output firmware that links cleanly. The
         # warning plus the resulting loud link error point back here.

tests/unit_tests/test_platformio_extra_script.py

@@ -117,8 +117,10 @@ def test_apply_extra_script_path_traversal_is_rejected(tmp_path):
     c.path = library_dir
     c.data = {"build": {"extraScript": "../evil.py"}}
 
-    apply_extra_script(c, board_mcu=lambda: "esp32", pio_platform="espressif32")
+    from esphome.core import EsphomeError
 
+    with pytest.raises(EsphomeError, match="escapes the library directory"):
+        apply_extra_script(c, board_mcu=lambda: "esp32", pio_platform="espressif32")
     # Nothing was folded into flags: the traversal was rejected before
     # the script could run.
     assert "flags" not in c.data["build"]
@@ -297,3 +299,16 @@ def test_unsupported_env_method_warns_once(caplog) -> None:
     env.Replace(CC="clang")
     env.Replace(CC="gcc")
     assert caplog.text.count("env.Replace(...) is not supported") == 1
+
+
+def test_run_extra_script_sys_exit_is_best_effort(tmp_path, caplog) -> None:
+    """sys.exit() in a vendored script must not kill the esphome run."""
+    from esphome.platformio.extra_script import run_extra_script
+
+    script = tmp_path / "extra.py"
+    script.write_text("import sys\nsys.exit(3)\n")
+    result = run_extra_script(
+        script, library_dir=tmp_path, board_mcu="esp32", pio_platform="espressif32"
+    )
+    assert result.libs == []
+    assert "ignoring its output" in caplog.text