Create a separate script for verifying bundled wheels

Author: illia-v

.github/workflows/ensurepip_verify_bundled.yml

@@ -0,0 +1,18 @@
+name: Verify bundled pip and setuptools
+
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - 'Lib/ensurepip/_bundled/**'
+  pull_request:
+    paths:
+      - 'Lib/ensurepip/_bundled/**'
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Compare checksums of bundled pip and setuptools to ones published on PyPI
+        run: ./Misc/verify-bundled-wheels.sh

.github/workflows/verify_bundled_wheels.yml

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+#
+# Purpose: Compare checksums of bundled pip and setuptools to ones
+#          published on PyPI (retrieved via the Warehouse’s JSON API).
+#
+# Synopsis: ./Misc/verify-bundled-wheels.sh
+#
+# Requirements: curl, jq
+#
+
+cd "$(dirname "$0")/.."
+package_names="pip setuptools"
+exit_status=0
+
+for package_name in ${package_names}; do
+    package_path=$(find Lib/ensurepip/_bundled/ -name "${package_name}*.whl")
+    echo "$package_path"
+
+    package_name_uppercase=$(echo "$package_name" | tr "[:lower:]" "[:upper:]")
+    package_version=$(
+        grep -Pom 1 "_${package_name_uppercase}_VERSION = \"\K[^\"]+" Lib/ensurepip/__init__.py
+    )
+    expected_digest=$(curl -fs "https://pypi.org/pypi/${package_name}/json" | jq --raw-output "
+        .releases.\"${package_version}\"
+        | .[]
+        | select(.filename == \"$(basename "$package_path")\")
+        | .digests.sha256
+    ")
+    echo "Expected digest: ${expected_digest}"
+
+    actual_digest=$(sha256sum "$package_path" | awk '{print $1}')
+    echo "Actual digest:\t ${actual_digest}"
+
+    # The messages are formatted to be parsed by GitHub Actions.
+    # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#setting-a-notice-message
+    if [ "$actual_digest" = "$expected_digest" ]; then
+        echo "::notice file=${package_path}::Successfully verified checksum of this wheel."
+    else
+        echo "::error file=${package_path}::Failed to verify checksum of this wheel."
+        exit_status=1
+    fi
+    echo
+done
+
+exit $exit_status