Print a message and don't reinstall wheels

Also, adds a test for source distributions being reinstalled.
Signed-off-by: NPradyun Gedam <pradyunsg@users.noreply.github.com>

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

@@ -134,23 +134,31 @@ class Resolver(BaseResolver):
             # and set a flag for later stages to uninstall it, if needed.
             #
             # * There is no existing installation. Nothing to uninstall.
-            # * The candidate is a local path/file. Always reinstall.
             # * The --force-reinstall flag is set. Always reinstall.
             # * The installation is different in version or editable-ness, so
             #   we need to uninstall it to install the new distribution.
-            # * The installed version is the same as the pending distribution.
-            #   Skip this distribution altogether to save work.
+            # * The installed version is different from the pending distribution.
+            # * The candidate is a local wheel. Do nothing.
+            # * The candidate is a local path. Always reinstall.
             installed_dist = self.factory.get_dist_to_uninstall(candidate)
             if installed_dist is None:
                 ireq.should_reinstall = False
-            elif candidate.source_link.is_file:
-                ireq.should_reinstall = True
             elif self.factory.force_reinstall:
                 ireq.should_reinstall = True
             elif installed_dist.parsed_version != candidate.version:
                 ireq.should_reinstall = True
             elif dist_is_editable(installed_dist) != candidate.is_editable:
                 ireq.should_reinstall = True
+            elif candidate.source_link.is_file:
+                if candidate.source_link.is_wheel:
+                    logger.info(
+                        "%s is already installed with the same version as the "
+                        "provided wheel. Use --force-reinstall to force an "
+                        "installation of the wheel.",
+                        ireq.name,
+                    )
+                    continue
+                ireq.should_reinstall = True
             else:
                 continue
 

tests/functional/test_new_resolver.py

@@ -1152,51 +1152,28 @@ def test_new_resolver_check_wheel_version_normalized(
     assert_installed(script, simple="0.1.0+local.1")
 
 
-def test_new_resolver_contraint_on_dep_with_extra(script):
-    create_basic_wheel_for_package(
-        script,
-        name="simple",
-        version="1",
-        depends=["dep[x]"],
-    )
-    create_basic_wheel_for_package(
-        script,
-        name="dep",
-        version="1",
-        extras={"x": ["depx==1"]},
-    )
-    create_basic_wheel_for_package(
-        script,
-        name="dep",
-        version="2",
-        extras={"x": ["depx==2"]},
-    )
-    create_basic_wheel_for_package(
+def test_new_resolver_does_not_reinstall_local_wheels(script):
+    archive_path = create_basic_wheel_for_package(
         script,
-        name="depx",
-        version="1",
+        "pkg",
+        "1.0",
     )
-    create_basic_wheel_for_package(
-        script,
-        name="depx",
-        version="2",
+    script.pip(
+        "install", "--no-cache-dir", "--no-index",
+        archive_path,
     )
+    assert_installed(script, pkg="1.0")
 
-    constraints_txt = script.scratch_path / "constraints.txt"
-    constraints_txt.write_text("dep==1")
-
-    script.pip(
-        "install",
-        "--no-cache-dir", "--no-index",
-        "--find-links", script.scratch_path,
-        "--constraint", constraints_txt,
-        "simple",
+    result = script.pip(
+        "install", "--no-cache-dir", "--no-index",
+        archive_path,
     )
-    assert_installed(script, simple="1", dep="1", depx="1")
+    assert "Installing collected packages: pkg" not in result.stdout, str(result)
+    assert_installed(script, pkg="1.0")
 
 
-def test_new_resolver_does_reinstall_local_wheels(script):
-    archive_path = create_basic_wheel_for_package(
+def test_new_resolver_does_reinstall_local_sdists(script):
+    archive_path = create_basic_sdist_for_package(
         script,
         "pkg",
         "1.0",
@@ -1236,7 +1213,7 @@ def test_new_resolver_does_reinstall_local_paths(script):
 
 
 def test_new_resolver_does_not_reinstall_when_from_a_local_index(script):
-    create_basic_wheel_for_package(
+    create_basic_sdist_for_package(
         script,
         "simple",
         "0.1.0",