Remove dummy setup.py file (#2976)

GitHub Actions is dropping support for Python 2.7, making this difficult to test. Thankfully, Python 2.7 only accounts for 4% of our total downloads. The share of users using an ancient pip is probably even smaller.

6 files changed, 3 insertions, 64 deletions

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 8b8dab92..64afa535 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -4,6 +4,5 @@
 .github/workflows/          @sethmlarson @pquentin @shazow
 .github/CODEOWNERS          @sethmlarson @pquentin @shazow
 src/urllib3/_version.py     @sethmlarson @pquentin @shazow
-setup.py                    @sethmlarson @pquentin @shazow
 pyproject.toml              @sethmlarson @pquentin @shazow
 ci/                         @sethmlarson @pquentin @shazow
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2b8d1369..bca0332f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,10 +51,6 @@ jobs:
             os: ubuntu-latest
             experimental: false
             nox-session: test-pypy
-          - python-version: "2.7"
-            os: ubuntu-20.04  # CPython 2.7 is not available for ubuntu-22.04
-            experimental: false
-            nox-session: unsupported_setup_py
           - python-version: "3.x"
             os: ubuntu-latest
             experimental: false
@@ -90,20 +86,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
 
-      # Setup Python 3.x to run nox on behalf of Python 2.7
-      - if: matrix.python-version == '2.7'
-        name: "Setup Python 3.x"
-        uses: "actions/setup-python@d27e3f3d7c64b4bbf8e4abfb9b63b83e846e0435"
-        with:
-          python-version: "3.x"
-          cache: "pip"
-
-      - if: matrix.python-version == '2.7'
-        name: "Install dependencies"
-        run: python -m pip install --upgrade pip setuptools nox 'virtualenv<20.22.0'
-
-      - if: matrix.python-version != '2.7'
-        name: "Install dependencies"
+      - name: "Install dependencies"
         run: python -m pip install --upgrade pip setuptools nox
 
       - name: "Run tests"
@@ -112,8 +95,7 @@ jobs:
           PYTHON_VERSION: ${{ matrix.python-version }}
           NOX_SESSION: ${{ matrix.nox-session }}
 
-      - if: ${{ matrix.nox-session != 'unsupported_setup_py' }}
-        name: "Upload artifact"
+      - name: "Upload artifact"
         uses: "actions/upload-artifact@0b7f8abb1508181956e8e162db84b466c27e18ce"
         with:
           name: coverage-data
diff --git a/changelog/2975.removal.rst b/changelog/2975.removal.rst
new file mode 100644
index 00000000..f538ed1a
--- /dev/null
+++ b/changelog/2975.removal.rst
@@ -0,0 +1 @@
+Remove the ``setup.py`` shim, ``python setup.py install`` will print ``[Errno 2] No such file or directory`` instead of a warning to use pip
diff --git a/noxfile.py b/noxfile.py
index a59d55dd..06d7817c 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -2,20 +2,10 @@ from __future__ import annotations
 
 import os
 import shutil
-import subprocess
 import sys
 
 import nox
 
-SOURCE_FILES = [
-    "docs/",
-    "dummyserver/",
-    "src/",
-    "test/",
-    "noxfile.py",
-    "setup.py",
-]
-
 
 def tests_impl(
     session: nox.Session,
@@ -73,20 +63,6 @@ def test(session: nox.Session) -> None:
     tests_impl(session)
 
 
-@nox.session(python=["2.7"])
-def unsupported_setup_py(session: nox.Session) -> None:
-    # Can't check both returncode and output with session.run
-    process = subprocess.run(
-        ["python", "setup.py", "install"],
-        env={**session.env},
-        text=True,
-        capture_output=True,
-    )
-    assert process.returncode == 1
-    print(process.stderr)
-    assert "Please use `python -m pip install .` instead." in process.stderr
-
-
 @nox.session(python=["3"])
 def test_brotlipy(session: nox.Session) -> None:
     """Check that if 'brotlipy' is installed instead of 'brotli' or
diff --git a/pyproject.toml b/pyproject.toml
index 4efb930e..804ffd9f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -103,7 +103,6 @@ filterwarnings = [
 [tool.isort]
 profile = "black"
 add_imports = "from __future__ import annotations"
-skip = ["setup.py"]
 
 [tool.mypy]
 mypy_path = "src"
diff --git a/setup.py b/setup.py
deleted file mode 100755
index 6ba64c0d..00000000
--- a/setup.py
+++ /dev/null
@@ -1,18 +0,0 @@
-#!/usr/bin/env python
-# This file is protected via CODEOWNERS
-
-import sys
-
-sys.stderr.write(
-    """
-===============================
-Unsupported installation method
-===============================
-
-This version of urllib3 has dropped support for Python 2.7 and no longer supports
-installation with `python setup.py install`.
-
-Please use `python -m pip install .` instead.
-"""
-)
-sys.exit(1)