actions/setup-python with python-version 3.5 failing on GitHub Actions

[Jun Omae]

• See ​https://github.com/edgewall/trac/actions/runs/9240552839/job/25420971157#step:4:28
• The issue has already been reported at ​https://github.com/actions/setup-python/issues/866.
• Workaround is to set environment PIP_TRUSTED_HOST="pypi.python.org pypi.org files.pythonhosted.org".
  • ref: ​https://github.com/actions/setup-python/issues/866#issuecomment-2109784318

.github/workflows/build.yml

@@ -103 +103 @@
     - name: Checkout
       uses: actions/checkout@v4
 
+    - name: Workaround for pip with Python 3.5
+      if: ${{ matrix.python-version == '3.5' }}
+      run: |
+        echo 'PIP_TRUSTED_HOST=pypi.python.org pypi.org files.pythonhosted.org' >>"$GITHUB_ENV"
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:
@@ -175 +180 @@
         ref: v1.4
         path: py3c
 
+    - name: Workaround for pip with Python 3.5
+      if: ${{ matrix.python-version == '3.5' }}
+      run: |
+        echo 'PIP_TRUSTED_HOST=pypi.python.org pypi.org files.pythonhosted.org' >>"$GITHUB_ENV"
+
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v5
       with:

[Jun Omae]

Applied in [17808] and merged in [17809]. I'll revert the changes if the root cause is fixed.

[Jun Omae]

The issue of setup-python has been closed. No fix except the workaround.