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[libc++] Re-add a script to trigger the libc++ Buildkite pipeline (#146730)

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This was removed in 99cdc26c94 when the LLVM monorepo Buildkite setup
was removed. Libc++ previously relied on the LLVM monorepo pipeline to
trigger its own pipeline when needed. Since there is no LLVM monorepo
pipeline anymore, we must trigger the libc++ Buildkite pipeline on every
pull request and use this script to determine which jobs to actually
start based on the files that are touched by the PR.
This commit is contained in:
Louis Dionne 2025-07-02 11:43:19 -04:00 committed by GitHub
parent 7d52b0983e
commit 05ebb363c9
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1 changed files with 34 additions and 0 deletions
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34
libcxx/utils/ci/buildkite-pipeline-trigger.sh Executable file
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# ===----------------------------------------------------------------------===##
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
# ===----------------------------------------------------------------------===##
#
# This script determines whether the libc++ Buildkite pipeline should be triggered
# on a change. This is required because Buildkite gets notified for every PR in the
# LLVM monorepo, and we make it a no-op unless the libc++ pipeline needs to be triggered.
#
# Set by buildkite
: ${BUILDKITE_PULL_REQUEST_BASE_BRANCH:=}
# Fetch origin to have an up to date merge base for the diff.
git fetch origin
# List of files affected by this commit
: ${MODIFIED_FILES:=$(git diff --name-only origin/${BUILDKITE_PULL_REQUEST_BASE_BRANCH}...HEAD)}
echo "Files modified:" >&2
echo "$MODIFIED_FILES" >&2
modified_dirs=$(echo "$MODIFIED_FILES" | cut -d'/' -f1 | sort -u)
echo "Directories modified:" >&2
echo "$modified_dirs" >&2
# If libc++ or one of the runtimes directories changed, trigger the libc++ Buildkite pipeline.
if echo "$modified_dirs" | grep -q -E "^(libcxx|libcxxabi|libunwind|runtimes|cmake)$"; then
buildkite-agent pipeline upload libcxx/utils/ci/buildkite-pipeline.yml
else
echo "No Buildkite jobs to trigger"
fi