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ci: take Python from the runner's tool cache, not from a mid-run download #873

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Merged
rafeekpro merged 1 commit into from
Aug 13, 2026
Merged

ci: take Python from the runner's tool cache, not from a mid-run download #873

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23 changes: 19 additions & 4 deletions .github/workflows/ci.yml
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,13 @@ permissions:

env:
UV_VERSION: "0.8.15"
# uv defaults to `managed`, i.e. it PREFERS its own CPython and downloads it from
# python-build-standalone on GitHub Releases. On 2026-08-12 that download failed mid-run
# ("http2 error: refused stream"), one of four toolchain fetches that broke fleet CI that
# day for reasons unrelated to any code. `only-system` makes uv use the interpreter
# actions/setup-python already put there — which on ubuntu-latest comes out of the runner's
# tool cache and crosses no network at all.
UV_PYTHON_PREFERENCE: only-system
NODE_VERSION: "22"
PNPM_VERSION: "9"

Expand Down Expand Up @@ -100,7 +107,9 @@ jobs:

- name: Pin Python from .python-version
if: needs.classify.result != 'success' || needs.classify.outputs.run_python == 'true'
run: uv python install
uses: actions/setup-python@v5
with:
python-version-file: '.python-version'

# Guard against source/lock drift (#645): dependabot's uv group can bump
# uv.lock without widening the source pyproject.toml constraints (or vice
Expand Down Expand Up @@ -185,7 +194,9 @@ jobs:

- name: Pin Python from .python-version
if: needs.classify.result != 'success' || needs.classify.outputs.run_python_smoke == 'true'
run: uv python install
uses: actions/setup-python@v5
with:
python-version-file: '.python-version'

- name: Install workspace (frozen)
if: needs.classify.result != 'success' || needs.classify.outputs.run_python_smoke == 'true'
Expand Down Expand Up @@ -226,7 +237,9 @@ jobs:

- name: Pin Python from .python-version
if: needs.classify.result != 'success' || needs.classify.outputs.run_pip_audit == 'true'
run: uv python install
uses: actions/setup-python@v5
with:
python-version-file: '.python-version'

- name: Install workspace (frozen)
if: needs.classify.result != 'success' || needs.classify.outputs.run_pip_audit == 'true'
Expand Down Expand Up @@ -275,7 +288,9 @@ jobs:

- name: Pin Python from .python-version
if: needs.classify.result != 'success' || needs.classify.outputs.run_dashboard == 'true'
run: uv python install
uses: actions/setup-python@v5
with:
python-version-file: '.python-version'

- name: Install Python workspace (frozen)
if: needs.classify.result != 'success' || needs.classify.outputs.run_dashboard == 'true'
Expand Down
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