Add --ignore-packages to pip check

Author: q0w

news/11157.feature.rst

@@ -0,0 +1 @@
+Add ``--ignore-packages`` flag to ``pip check`` to ignore specific packages.

src/pip/_internal/commands/check.py

@@ -1,6 +1,6 @@
 import logging
 from optparse import Values
-from typing import List
+from typing import Callable, List, Optional
 
 from pip._internal.cli.base_command import Command
 from pip._internal.cli.status_codes import ERROR, SUCCESS
@@ -19,10 +19,26 @@ class CheckCommand(Command):
     usage = """
       %prog [options]"""
 
+    def add_options(self) -> None:
+        self.cmd_opts.add_option(
+            "--ignore-packages",
+            action="append",
+            metavar="PACKAGE",
+            dest="ignore_packages",
+            default=[],
+            help="Ignore packages.",
+        )
+        self.parser.insert_option_group(0, self.cmd_opts)
+
     def run(self, options: Values, args: List[str]) -> int:
 
         package_set, parsing_probs = create_package_set_from_installed()
-        missing, conflicting = check_package_set(package_set)
+        should_ignore: Optional[Callable[[str], bool]] = (
+            (lambda p: p in options.ignore_packages)
+            if options.ignore_packages
+            else None
+        )
+        missing, conflicting = check_package_set(package_set, should_ignore)
 
         for project_name in missing:
             version = package_set[project_name].version

tests/functional/test_check.py

@@ -309,3 +309,21 @@ def test_check_include_work_dir_pkg(script: PipTestEnvironment) -> None:
     expected_lines = ("simple 1.0 requires missing, which is not installed.",)
     assert matches_expected_lines(result.stdout, expected_lines)
     assert result.returncode == 1
+
+
+def test_check_ignore_packages(script: PipTestEnvironment) -> None:
+    package_a_path = create_test_package_with_setup(
+        script,
+        name="package_A",
+        version="1.0",
+        install_requires=["missing>=1.0"],
+    )
+
+    # Without dependency
+    result = script.pip("install", "--no-index", package_a_path, "--no-deps")
+    assert "Successfully installed package-A-1.0" in result.stdout, str(result)
+
+    result = script.pip("check", "--ignore-packages=package-a")
+    expected_lines = ("No broken requirements found.",)
+    assert matches_expected_lines(result.stdout, expected_lines)
+    assert result.returncode == 0