add and implement --avoid-wheel-downloads option to download

Author: cosmicexplorer

src/pip/_internal/cli/req_command.py

@@ -308,6 +308,7 @@ def make_resolver(
         use_user_site: bool = False,
         ignore_installed: bool = True,
         ignore_requires_python: bool = False,
+        avoid_wheel_downloads: bool = False,
         force_reinstall: bool = False,
         upgrade_strategy: str = "to-satisfy-only",
         use_pep517: Optional[bool] = None,
@@ -337,6 +338,7 @@ def make_resolver(
                 ignore_dependencies=options.ignore_dependencies,
                 ignore_installed=ignore_installed,
                 ignore_requires_python=ignore_requires_python,
+                avoid_wheel_downloads=avoid_wheel_downloads,
                 force_reinstall=force_reinstall,
                 upgrade_strategy=upgrade_strategy,
                 py_version_info=py_version_info,

src/pip/_internal/commands/download.py

@@ -71,6 +71,15 @@ def add_options(self) -> None:
             help=("Print URLs of any downloaded distributions to this file."),
         )
 
+        self.cmd_opts.add_option(
+            '--avoid-wheel-downloads',
+            dest='avoid_wheel_downloads',
+            default=False,
+            action='store_true',
+            help=("Where possible, avoid downloading wheels. This is "
+                  "currently only useful if --print-download-urls is set."),
+        )
+
         cmdoptions.add_target_python_options(self.cmd_opts)
 
         index_opts = cmdoptions.make_option_group(
@@ -130,6 +139,7 @@ def run(self, options: Values, args: List[str]) -> int:
             options=options,
             ignore_requires_python=options.ignore_requires_python,
             py_version_info=options.python_version,
+            avoid_wheel_downloads=options.avoid_wheel_downloads,
         )
 
         self.trace_basic_info(finder)

src/pip/_internal/resolution/resolvelib/resolver.py

@@ -45,6 +45,7 @@ def __init__(
         ignore_dependencies: bool,
         ignore_installed: bool,
         ignore_requires_python: bool,
+        avoid_wheel_downloads: bool,
         force_reinstall: bool,
         upgrade_strategy: str,
         py_version_info: Optional[Tuple[int, ...]] = None,
@@ -64,6 +65,7 @@ def __init__(
             py_version_info=py_version_info,
         )
         self.ignore_dependencies = ignore_dependencies
+        self.avoid_wheel_downloads = avoid_wheel_downloads
         self.upgrade_strategy = upgrade_strategy
         self._result: Optional[Result] = None
 
@@ -157,8 +159,10 @@ def resolve(
 
             req_set.add_named_requirement(ireq)
 
-        reqs = req_set.all_requirements
-        self.factory.preparer.prepare_linked_requirements_more(reqs)
+        if not self.avoid_wheel_downloads:
+            reqs = req_set.all_requirements
+            self.factory.preparer.prepare_linked_requirements_more(reqs)
+
         return req_set
 
     def get_installation_order(