chore: refactor cibuildwheel.utils (#2252)

* chore: refactor cibuildwheel.utils

* rework build_frontend extra flags

* ci(fix): use tonistiigi/binfmt:qemu-v8.1.5 image for qemu

unit_test/main_tests/conftest.py

@@ -8,7 +8,8 @@ from pathlib import Path
 
 import pytest
 
-from cibuildwheel import linux, macos, pyodide, util, windows
+from cibuildwheel import __main__, linux, macos, pyodide, windows
+from cibuildwheel.util import file
 
 
 class ArgsInterceptor:
@@ -38,7 +39,7 @@ def mock_protection(monkeypatch):
         pass
 
     monkeypatch.setattr(subprocess, "Popen", fail_on_call)
-    monkeypatch.setattr(util, "download", fail_on_call)
+    monkeypatch.setattr(file, "download", fail_on_call)
     monkeypatch.setattr(windows, "build", fail_on_call)
     monkeypatch.setattr(linux, "build", fail_on_call)
     monkeypatch.setattr(macos, "build", fail_on_call)
@@ -58,7 +59,7 @@ def disable_print_wheels(monkeypatch):
     def empty_cm(*args, **kwargs):
         yield
 
-    monkeypatch.setattr(util, "print_new_wheels", empty_cm)
+    monkeypatch.setattr(__main__, "print_new_wheels", empty_cm)
 
 
 @pytest.fixture

unit_test/main_tests/main_options_test.py

@@ -9,8 +9,10 @@ import pytest
 
 from cibuildwheel.__main__ import main
 from cibuildwheel.environment import ParsedEnvironment
+from cibuildwheel.frontend import _split_config_settings
 from cibuildwheel.options import BuildOptions, _get_pinned_container_images
-from cibuildwheel.util import BuildSelector, EnableGroup, resources_dir, split_config_settings
+from cibuildwheel.selector import BuildSelector, EnableGroup
+from cibuildwheel.util import resources
 
 # CIBW_PLATFORM is tested in main_platform_test.py
 
@@ -281,13 +283,13 @@ def test_config_settings(platform_specific, platform, intercepted_build_args, mo
 
     assert build_options.config_settings == config_settings
 
-    assert split_config_settings(config_settings, "build") == [
+    assert _split_config_settings(config_settings, "build") == [
         "--config-setting=setting=value",
         "--config-setting=setting=value2",
         "--config-setting=other=something else",
     ]
 
-    assert split_config_settings(config_settings, "pip") == [
+    assert _split_config_settings(config_settings, "pip") == [
         "--config-settings=setting=value",
         "--config-settings=setting=value2",
         "--config-settings=other=something else",
@@ -411,8 +413,7 @@ def test_defaults(platform, intercepted_build_args):
     main()
 
     build_options: BuildOptions = intercepted_build_args.args[0].build_options(identifier=None)
-    defaults_config_path = resources_dir / "defaults.toml"
-    with defaults_config_path.open("rb") as f:
+    with resources.DEFAULTS.open("rb") as f:
         defaults_toml = tomllib.load(f)
 
     root_defaults = defaults_toml["tool"]["cibuildwheel"]

unit_test/main_tests/main_platform_test.py

@@ -6,7 +6,7 @@ import pytest
 
 from cibuildwheel.__main__ import main
 from cibuildwheel.architecture import Architecture
-from cibuildwheel.util import EnableGroup
+from cibuildwheel.selector import EnableGroup
 
 from ..conftest import MOCK_PACKAGE_DIR