{CI} Fix macOS build: Use libexec/bin/python instead of libexec/bin/python3#33538
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The Homebrew python@X.Y formula only creates the unversioned 'python' symlink in libexec/bin unconditionally. The 'python3' symlink is created only for altinstalls (when the formula is NOT Homebrew's default python3 alias). After bumping to 3.14, python@3.14 is an altinstall (3.13 remains the python3 alias), so .../python@3.14/libexec/bin/python3 does not exist, breaking the macOS build/sign/cask pipelines. Use the always-present 'python' symlink instead.
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Pull request overview
This PR addresses a macOS packaging pipeline break caused by Homebrew python@X.Y formulae not always providing libexec/bin/python3 (notably for 3.14), by switching to the always-present libexec/bin/python. It also introduces a new automated “Python Upgrade Agent” (scripts, tests, and a scheduled GitHub Actions workflow) plus associated documentation.
Changes:
- Fix macOS pipeline and packaging scripts to use
.../libexec/bin/pythoninstead of.../libexec/bin/python3for Homebrew-managed Python. - Add a Python minor-version upgrade automation agent (
scripts/python_upgrade_agent/) with validation, post-checking, and unit tests. - Add a scheduled GitHub Actions workflow to run the agent, plus playbook/docs and log-file gitignore entry.
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
.azure-pipelines/templates/macos/macos-build-jobs.yml |
Switches Homebrew Python path usage to libexec/bin/python in macOS build/test steps. |
.azure-pipelines/templates/macos/macos-cask-generation-and-tests.yml |
Switches AZ_PYTHON to libexec/bin/python for cask generation/tests. |
.azure-pipelines/templates/macos/macos-sign-notarize-jobs.yml |
Switches AZ_PYTHON to libexec/bin/python for functional tests in sign/notarize jobs. |
scripts/release/macos/build_binary_tar_gz.py |
Updates Homebrew Python discovery to prefer libexec/bin/python (candidates + brew --prefix fallback). |
.github/workflows/PythonUpgradeAgent.yml |
Adds scheduled + manual workflow to run the new Python upgrade agent using an app token and models token. |
scripts/python_upgrade_agent/agent.py |
Orchestrates detect → discover → LLM → validate → post-check → apply → draft PR creation. |
scripts/python_upgrade_agent/ai.py |
Implements GitHub Models call, prompt construction, and reference-PR few-shot retrieval. |
scripts/python_upgrade_agent/detect.py |
Detects current embedded Python from build.cmd and selects next-minor target from python.org feed. |
scripts/python_upgrade_agent/discover.py |
Uses git grep with exclusions to discover candidate version references with context. |
scripts/python_upgrade_agent/validate.py |
Validates LLM-proposed edits against candidate set, uniqueness, and size caps. |
scripts/python_upgrade_agent/post_check.py |
Simulates edits in-memory and flags leftover current-minor hits not listed as skipped. |
scripts/python_upgrade_agent/github_ops.py |
Thin wrappers around git/gh for branching, applying edits, pushing, and PR creation. |
scripts/python_upgrade_agent/README.md |
Documents the agent’s flow, configuration, and local testing. |
scripts/python_upgrade_agent/pr_template.md |
PR body template emitted by the agent. |
scripts/python_upgrade_agent/next_steps_template.md |
“Next steps” content embedded into the agent-opened PR body. |
scripts/python_upgrade_agent/__init__.py |
Marks the agent as a package. |
scripts/python_upgrade_agent/tests/__init__.py |
Test package marker. |
scripts/python_upgrade_agent/tests/test_validate.py |
Unit tests for validation logic (paths, uniqueness, caps, additive classifier rule). |
scripts/python_upgrade_agent/tests/test_post_check.py |
Unit tests for deterministic post-check behavior. |
scripts/python_upgrade_agent/tests/test_discover.py |
Unit tests for discovery regex/path exclusion behavior using a mini git repo. |
scripts/python_upgrade_agent/tests/test_detect.py |
Unit tests for version detection/decision logic. |
doc/presentations/python-upgrade-campaign-playbook.md |
Adds a playbook describing the operational workflow for Python minor bumps. |
.gitignore |
Ignores the agent’s verbose log file (python_upgrade_agent.log). |
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Jun 12, 2026
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Problem
After bumping the embedded Python to 3.14, the macOS build pipeline fails at the
Install Homebrew Pythonstep:Root cause
The Homebrew
python@X.Yformula creates the unversionedpythonsymlink inlibexec/binunconditionally, but creates the major-versionedpython3symlink inlibexec/binonly for altinstalls (i.e. when the formula is not Homebrew's current defaultpython3):python@3.14is currently Homebrew's defaultpython3(altinstall? == false; it is installed as/opt/homebrew/bin/python3). For the default formula the realpython3lives inHOMEBREW_PREFIX/bin, so nopython3symlink is added underlibexec/bin-- only the unversionedpython. Hence.../python@3.14/libexec/bin/python3does not exist.This is confirmed by the formulae caveats: 3.14 says
Python is installed as .../bin/python3and lists only unversioned libexec symlinks (python,pip); 3.13 (the altinstall) says.../bin/python3.13and lists bothpythonandpython3in libexec. This is why the pipeline worked on 3.13 and broke after the bump to 3.14.Fix
Use the always-present unversioned
libexec/bin/pythonsymlink instead oflibexec/bin/python3. This is robust regardless of which minor version is Homebrew's defaultpython3.Files changed
.azure-pipelines/templates/macos/macos-build-jobs.yml(2 occurrences).azure-pipelines/templates/macos/macos-cask-generation-and-tests.yml.azure-pipelines/templates/macos/macos-sign-notarize-jobs.ymlscripts/release/macos/build_binary_tar_gz.py(candidate list +brew --prefixfallback)