WheelCache optional FormatControl

Author: sbidoul

src/pip/_internal/cache.py

@@ -10,6 +10,7 @@
 from pip._vendor.packaging.utils import canonicalize_name
 
 from pip._internal.exceptions import InvalidWheelFilename
+from pip._internal.models.format_control import FormatControl
 from pip._internal.models.link import Link
 from pip._internal.models.wheel import Wheel
 from pip._internal.utils.temp_dir import TempDirectory, tempdir_kinds
@@ -21,8 +22,6 @@
 
     from pip._vendor.packaging.tags import Tag
 
-    from pip._internal.models.format_control import FormatControl
-
 logger = logging.getLogger(__name__)
 
 
@@ -280,8 +279,10 @@ class WheelCache(Cache):
     when a certain link is not found in the simple wheel cache first.
     """
 
-    def __init__(self, cache_dir, format_control):
-        # type: (str, FormatControl) -> None
+    def __init__(self, cache_dir, format_control=None):
+        # type: (str, Optional[FormatControl]) -> None
+        if format_control is None:
+            format_control = FormatControl()
         super().__init__(cache_dir, format_control, {'binary'})
         self._wheel_cache = SimpleWheelCache(cache_dir, format_control)
         self._ephem_cache = EphemWheelCache(format_control)

src/pip/_internal/commands/install.py

@@ -276,7 +276,10 @@ def run(self, options, args):
             target_python=target_python,
             ignore_requires_python=options.ignore_requires_python,
         )
-        wheel_cache = WheelCache(options.cache_dir, options.format_control)
+        if "always-install-via-wheel" in options.features_enabled:
+            wheel_cache = WheelCache(options.cache_dir)
+        else:
+            wheel_cache = WheelCache(options.cache_dir, options.format_control)
 
         req_tracker = self.enter_context(get_requirement_tracker())
 

src/pip/_internal/commands/wheel.py

@@ -105,7 +105,10 @@ def run(self, options, args):
         session = self.get_default_session(options)
 
         finder = self._build_package_finder(options, session)
-        wheel_cache = WheelCache(options.cache_dir, options.format_control)
+        if "always-install-via-wheel" in options.features_enabled:
+            wheel_cache = WheelCache(options.cache_dir)
+        else:
+            wheel_cache = WheelCache(options.cache_dir, options.format_control)
 
         options.wheel_dir = normalize_path(options.wheel_dir)
         ensure_dir(options.wheel_dir)