Add trusted publisher release workfiow

.github/dependabot.yml

@@ -3,8 +3,12 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "monthly"
+      interval: "weekly"
     groups:
       github-actions:
         patterns:
           - "*"
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/release.yml

@@ -0,0 +1,44 @@
+name: Publish Python 🐍 distribution 📦 to PyPI
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  build:
+    name: Build distribution 📦
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          persist-credentials: false
+      - name: Build a binary wheel and a source tarball
+        run: ./build-project.py
+      - name: Store the distribution packages
+        uses: actions/upload-artifact@65c4c4a1ddee5b72f698fdd19549f0f0fb45cf08 # v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-pypi:
+    name: >-
+      Publish Python 🐍 distribution 📦 to PyPI
+    needs:
+      - build
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/project/pip/${{ github.ref_name }}
+    permissions:
+      id-token: write  # IMPORTANT: mandatory for trusted publishing
+
+    steps:
+      - name: Download all the dists
+        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - name: Publish distribution 📦 to PyPI
+        uses: pypa/gh-action-pypi-publish@67339c736fd9354cd4f8cb0b744f2b82a74b5c70 # release/v1

MANIFEST.in

@@ -5,6 +5,10 @@ include README.rst
 include SECURITY.md
 include pyproject.toml
 
+include build-requirements.in
+include build-requirements.txt
+include build-project.py
+
 include src/pip/_vendor/README.rst
 include src/pip/_vendor/vendor.txt
 recursive-include  src/pip/_vendor *LICENSE*

build-project.py

@@ -0,0 +1,67 @@
+#!/usr/bin/env python3
+"""Build pip using pinned build requirements."""
+
+import subprocess
+import tempfile
+import venv
+from os import PathLike
+from pathlib import Path
+from types import SimpleNamespace
+
+
+class EnvBuilder(venv.EnvBuilder):
+    """A subclass of venv.EnvBuilder that exposes the python executable command."""
+
+    def ensure_directories(
+        self, env_dir: str | bytes | PathLike[str] | PathLike[bytes]
+    ) -> SimpleNamespace:
+        context = super().ensure_directories(env_dir)
+        self.env_exec_cmd = context.env_exec_cmd
+        return context
+
+
+def get_git_head_timestamp() -> str:
+    return subprocess.run(
+        [
+            "git",
+            "log",
+            "-1",
+            "--pretty=format:%ct",
+        ],
+        text=True,
+        stdout=subprocess.PIPE,
+    ).stdout.strip()
+
+
+def main() -> None:
+    with tempfile.TemporaryDirectory() as build_env:
+        env_builder = EnvBuilder(with_pip=True)
+        env_builder.create(build_env)
+        subprocess.run(
+            [
+                env_builder.env_exec_cmd,
+                "-Im",
+                "pip",
+                "install",
+                "--no-deps",
+                "--only-binary=:all:",
+                "--require-hashes",
+                "-r",
+                Path(__file__).parent / "build-requirements.txt",
+            ],
+            check=True,
+        )
+        subprocess.run(
+            [
+                env_builder.env_exec_cmd,
+                "-Im",
+                "build",
+                "--no-isolation",
+            ],
+            check=True,
+            env={"SOURCE_DATE_EPOCH": get_git_head_timestamp()},
+        )
+
+
+if __name__ == "__main__":
+    main()

build-requirements.in

@@ -0,0 +1,2 @@
+build
+setuptools

build-requirements.txt

@@ -0,0 +1,24 @@
+#
+# This file is autogenerated by pip-compile with Python 3.12
+# by the following command:
+#
+#    pip-compile --allow-unsafe --generate-hashes build-requirements.in
+#
+build==1.2.2.post1 \
+    --hash=sha256:1d61c0887fa860c01971625baae8bdd338e517b836a2f70dd1f7aa3a6b2fc5b5 \
+    --hash=sha256:b36993e92ca9375a219c99e606a122ff365a760a2d4bba0caa09bd5278b608b7
+    # via -r build-requirements.in
+packaging==24.2 \
+    --hash=sha256:09abb1bccd265c01f4a3aa3f7a7db064b36514d2cba19a2f694fe6150451a759 \
+    --hash=sha256:c228a6dc5e932d346bc5739379109d49e8853dd8223571c7c5b55260edc0b97f
+    # via build
+pyproject-hooks==1.2.0 \
+    --hash=sha256:1e859bd5c40fae9448642dd871adf459e5e2084186e8d2c2a79a824c970da1f8 \
+    --hash=sha256:9e5c6bfa8dcc30091c74b0cf803c81fdd29d94f01992a7707bc97babb1141913
+    # via build
+
+# The following packages are considered to be unsafe in a requirements file:
+setuptools==75.8.0 \
+    --hash=sha256:c5afc8f407c626b8313a86e10311dd3f661c6cd9c09d4bf8c15c0e11f9f2b0e6 \
+    --hash=sha256:e3982f444617239225d675215d51f6ba05f845d4eec313da4418fdbb56fb27e3
+    # via -r build-requirements.in

docs/html/development/release-process.rst

@@ -146,11 +146,8 @@ Creating a new release
    This will update the relevant files and tag the correct commit.
 #. Submit the ``release/YY.N`` branch as a pull request and ensure CI passes.
    Merge the changes back into ``main`` and pull them back locally.
-#. Build the release artifacts using ``nox -s build-release -- YY.N``.
-   This will checkout the tag, generate the distribution files to be
-   uploaded and checkout the main branch again.
-#. Upload the release to PyPI using ``nox -s upload-release -- YY.N``.
-#. Push the tag created by ``prepare-release``.
+#. Push the tag created by ``prepare-release``. This will trigger the release
+   workflow on GitHub and publish to PyPI.
 #. Regenerate the ``get-pip.py`` script in the `get-pip repository`_ (as
    documented there) and commit the results.
 #. Submit a Pull Request to `CPython`_ adding the new version of pip

news/13048.process.rst

@@ -0,0 +1,3 @@
+Started releasing to PyPI from a GitHub Actions CI/CD workflow that implements trusted publishing and bundles :pep:`740` digital attestations.
+
+In addition to being signed, the released distribution packages are now reproducible through the commit timestamp.

noxfile.py

@@ -339,7 +339,7 @@ def build_release(session: nox.Session) -> None:
         )
 
     session.log("# Install dependencies")
-    session.install("build", "twine")
+    session.install("twine")
 
     with release.isolated_temporary_checkout(session, version) as build_dir:
         session.log(
@@ -375,11 +375,11 @@ def build_dists(session: nox.Session) -> List[str]:
         )
 
     session.log("# Build distributions")
-    session.run("python", "-m", "build", silent=True)
+    session.run("python", "build-project.py", silent=True)
     produced_dists = glob.glob("dist/*")
 
     session.log(f"# Verify distributions: {', '.join(produced_dists)}")
-    session.run("twine", "check", *produced_dists, silent=True)
+    session.run("twine", "check", "--strict", *produced_dists, silent=True)
 
     return produced_dists