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reusable-change-detection.yml
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name: Reusable change detection
on: # yamllint disable-line rule:truthy
workflow_call:
outputs:
# Some of the referenced steps set outputs conditionally and there may be
# cases when referencing them evaluates to empty strings. It is nice to
# work with proper booleans so they have to be evaluated through JSON
# conversion in the expressions. However, empty strings used like that
# may trigger all sorts of undefined and hard-to-debug behaviors in
# GitHub Actions CI/CD. To help with this, all of the outputs set here
# that are meant to be used as boolean flags (and not arbitrary strings),
# MUST have fallbacks with default values set. A common pattern would be
# to add ` || false` to all such expressions here, in the output
# definitions. They can then later be safely used through the following
# idiom in job conditionals and other expressions. Here's some examples:
#
# if: fromJSON(needs.change-detection.outputs.run-docs)
#
# ${{
# fromJSON(needs.change-detection.outputs.run-tests)
# && 'truthy-branch'
# || 'falsy-branch'
# }}
#
config_hash:
description: Config hash value for use in cache keys
value: ${{ jobs.compute-changes.outputs.config-hash }} # str
run-docs:
description: Whether to build the docs
value: ${{ jobs.compute-changes.outputs.run-docs || false }} # bool
run_tests:
description: Whether to run the regular tests
value: ${{ jobs.compute-changes.outputs.run-tests || false }} # bool
run-win-msi:
description: Whether to run the MSI installer smoke tests
value: >- # bool
${{ jobs.compute-changes.outputs.run-win-msi || false }}
run_hypothesis:
description: Whether to run the Hypothesis tests
value: >- # bool
${{ jobs.compute-changes.outputs.run-hypothesis || false }}
run_cifuzz:
description: Whether to run the CIFuzz job
value: >- # bool
${{ jobs.compute-changes.outputs.run-cifuzz || false }}
jobs:
compute-changes:
name: Compute changed files
runs-on: ubuntu-latest
timeout-minutes: 10
outputs:
config-hash: ${{ steps.config-hash.outputs.hash }}
run-cifuzz: ${{ steps.check.outputs.run-cifuzz }}
run-docs: ${{ steps.docs-changes.outputs.run-docs }}
run-hypothesis: ${{ steps.check.outputs.run-hypothesis }}
run-tests: ${{ steps.check.outputs.run-tests }}
run-win-msi: ${{ steps.win-msi-changes.outputs.run-win-msi }}
steps:
- run: >-
echo '${{ github.event_name }}'
- uses: actions/checkout@v4
with:
persist-credentials: false
- name: Check for source changes
id: check
run: |
if [ -z "$GITHUB_BASE_REF" ]; then
echo "run-tests=true" >> "$GITHUB_OUTPUT"
else
git fetch origin "$GITHUB_BASE_REF" --depth=1
# git diff "origin/$GITHUB_BASE_REF..." (3 dots) may be more
# reliable than git diff "origin/$GITHUB_BASE_REF.." (2 dots),
# but it requires to download more commits (this job uses
# "git fetch --depth=1").
#
# git diff "origin/$GITHUB_BASE_REF..." (3 dots) works with Git
# 2.26, but Git 2.28 is stricter and fails with "no merge base".
#
# git diff "origin/$GITHUB_BASE_REF.." (2 dots) should be enough on
# GitHub, since GitHub starts by merging origin/$GITHUB_BASE_REF
# into the PR branch anyway.
#
# https://github.com/python/core-workflow/issues/373
git diff --name-only "origin/$GITHUB_BASE_REF.." | grep -qvE '(\.rst$|^Doc|^Misc|^\.pre-commit-config\.yaml$|\.ruff\.toml$|\.md$|mypy\.ini$)' && echo "run-tests=true" >> "$GITHUB_OUTPUT" || true
fi
# Check if we should run hypothesis tests
GIT_BRANCH=${GITHUB_BASE_REF:-${GITHUB_REF#refs/heads/}}
echo "$GIT_BRANCH"
if $(echo "$GIT_BRANCH" | grep -q -w '3\.\(8\|9\|10\|11\)'); then
echo "Branch too old for hypothesis tests"
echo "run-hypothesis=false" >> "$GITHUB_OUTPUT"
else
echo "Run hypothesis tests"
echo "run-hypothesis=true" >> "$GITHUB_OUTPUT"
fi
# oss-fuzz maintains a configuration for fuzzing the main branch of
# CPython, so CIFuzz should be run only for code that is likely to be
# merged into the main branch; compatibility with older branches may
# be broken.
FUZZ_RELEVANT_FILES='(\.c$|\.h$|\.cpp$|^configure$|^\.github/workflows/build\.yml$|^Modules/_xxtestfuzz)'
if [ "$GITHUB_BASE_REF" = "main" ] && [ "$(git diff --name-only "origin/$GITHUB_BASE_REF.." | grep -qE $FUZZ_RELEVANT_FILES; echo $?)" -eq 0 ]; then
# The tests are pretty slow so they are executed only for PRs
# changing relevant files.
echo "Run CIFuzz tests"
echo "run-cifuzz=true" >> "$GITHUB_OUTPUT"
else
echo "Branch too old for CIFuzz tests; or no C files were changed"
echo "run-cifuzz=false" >> "$GITHUB_OUTPUT"
fi
- name: Compute hash for config cache key
id: config-hash
run: |
echo "hash=${{ hashFiles('configure', 'configure.ac', '.github/workflows/build.yml') }}" >> "$GITHUB_OUTPUT"
- name: Get a list of the changed documentation-related files
if: github.event_name == 'pull_request'
id: changed-docs-files
uses: Ana06/[email protected]
with:
filter: |
Doc/**
Misc/**
.github/workflows/reusable-docs.yml
format: csv # works for paths with spaces
- name: Check for docs changes
# We only want to run this on PRs when related files are changed,
# or when user triggers manual workflow run.
if: >-
(
github.event_name == 'pull_request'
&& steps.changed-docs-files.outputs.added_modified_renamed != ''
) || github.event_name == 'workflow_dispatch'
id: docs-changes
run: |
echo "run-docs=true" >> "${GITHUB_OUTPUT}"
- name: Get a list of the MSI installer-related files
if: github.event_name == 'pull_request'
id: changed-win-msi-files
uses: Ana06/[email protected]
with:
filter: |
Tools/msi/**
.github/workflows/reusable-windows-msi.yml
format: csv # works for paths with spaces
- name: Check for changes in MSI installer-related files
# We only want to run this on PRs when related files are changed,
# or when user triggers manual workflow run.
if: >-
(
github.event_name == 'pull_request'
&& steps.changed-win-msi-files.outputs.added_modified_renamed != ''
) || github.event_name == 'workflow_dispatch'
id: win-msi-changes
run: |
echo "run-win-msi=true" >> "${GITHUB_OUTPUT}"