Raise error if --user and --target arguments are used together

news/7249.feature

@@ -0,0 +1 @@
+Raise error if --user and --target are used together in pip install

src/pip/_internal/commands/install.py

@@ -237,6 +237,9 @@ def __init__(self, *args, **kw):
  @with_cleanup
  def run(self, options, args):
  # type: (Values, List[Any]) -> int
+ if options.use_user_site and options.target_dir is not None:
+ raise CommandError("Can not combine '--user' and '--target'")
+
  cmdoptions.check_install_build_global(options)
  upgrade_strategy = "to-satisfy-only"
  if options.upgrade:

tests/functional/test_install.py

@@ -847,6 +847,27 @@ def test_install_package_with_target(script):
  assert singlemodule_py in result.files_updated, str(result)
 
 
+def test_install_package_to_usersite_with_target_must_fail(script):
+ """
+ Test that installing package to usersite with target
+ must raise error
+ """
+ target_dir = script.scratch_path / 'target'
+ result = script.pip_install_local(
+ '--user', '-t', target_dir, "simple==1.0", expect_error=True
+ )
+ assert "Can not combine '--user' and '--target'" in result.stderr, (
+ str(result)
+ )
+
+ result = script.pip_install_local(
+ '--user', '--target', target_dir, "simple==1.0", expect_error=True
+ )
+ assert "Can not combine '--user' and '--target'" in result.stderr, (
+ str(result)
+ )
+
+
 def test_install_nonlocal_compatible_wheel(script, data):
  target_dir = script.scratch_path / 'target'