Files
git/.github/workflows/main.yml
Johannes Schindelin f2078029ba ci(dockerized): reduce the PID limit for private repositories
Every once in a while I need to verify that Microsoft Git's test suite
passes for changes that are not yet meant for public consumption, and
since it was (made) too difficult to keep up a working Azure Pipeline
definition, I have to use GitHub Actions in a private GitHub repository
for that purpose.

In these tests, basically all Dockerized CI jobs fail consistently. The
symptom is something like:

  error: cannot create async thread: Resource temporarily unavailable

in the middle of a test, typically in the t5xxx-t6xxx range. The first
such error is immediately followed by plenty more of these errors, and
not a single test succeeds afterwards.

At first, I thought that maybe the massive parallelism I enjoy there is
the problem, and I thought that the cgroups limits might be shared
between the many containers that run on essentially the same physical
machine. But even reducing the matrix to just a single of those
Dockerized jobs runs into the very same problems.

The underlying reason seems to be a substantial difference in the hosted
runners that execute these Dockerized jobs: forcing the PID limit of the
container to a high number lets the jobs pass, even when running the
complete matrix of all 13 Dockerized jobs concurrently. But that's not
the only difference: The jobs seem to take a lot longer in these
containers than, say, in the containers made available to
https://github.com/git/git.

When forcing a PID limit of 64k in that private repository, the jobs
completed successfully, but they also took a lot longer, between 2x to
2.5x longer, i.e. painfully much longer. Reducing the PID limit to 16k,
the CI jobs still passed, but took an equally long amount of time.
Reducing the PID limit to 8k caused the errors to reappear.

Here are the numbers from three example runs, the first one forcing the
PID and nproc limit to 65536, the second one to 16384, the third run is
from the public git/git repository:

Job                           | 64k     | 16k     | reference
------------------------------|---------|---------|---------
almalinux-8                   | 19m 3s  | 16m 0s  | 9m 36s
debian-11                     | 20m 31s | 20m 3s  | 8m 5s
fedora-breaking-changes-meson | 16m 29s | 19m 19s | 9m 40s
linux-asan-ubsan              | 1h 10m  | 1h 11m  | 34m 36s
linux-breaking-changes        | 25m 39s | 25m 58s | 13m 15s
linux-leaks                   | 1h 9m   | 1h 10m  | 33m 30s
linux-meson                   | 28m 9s  | 27m 4s  | 13m 45s
linux-musl-meson              | 16m 32s | 13m 39s | 8m 6s
linux-reftable-leaks          | 1h 13m  | 1h 13m  | 34m 34s
linux-reftable                | 26m 2s  | 25m 48s | 13m 31s
linux-sha256                  | 26m 12s | 26m 3s  | 12m 36s
linux-TEST-vars               | 26m 5s  | 25m 21s | 13m 25s
linux32                       | 21m 16s | 19m 57s | 10m 44s

It does not look as if the PID limit is the reason for the longer
runtime, seeing as the 64k vs 16k timings deviate no more than as is
usual with GitHub workflows. So let's go for 16k.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2026-04-20 18:01:57 +02:00

518 lines
18 KiB
YAML

name: CI
on: [push, pull_request]
env:
DEVELOPER: 1
# If more than one workflow run is triggered for the very same commit hash
# (which happens when multiple branches pointing to the same commit), only
# the first one is allowed to run, the second will be kept in the "queued"
# state. This allows a successful completion of the first run to be reused
# in the second run via the `skip-if-redundant` logic in the `config` job.
#
# The only caveat is that if a workflow run is triggered for the same commit
# hash that another run is already being held, that latter run will be
# canceled. For more details about the `concurrency` attribute, see:
# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#concurrency
concurrency:
group: ${{ github.sha }}
jobs:
ci-config:
name: config
if: vars.CI_BRANCHES == '' || contains(vars.CI_BRANCHES, github.ref_name)
runs-on: ubuntu-latest
outputs:
enabled: ${{ steps.check-ref.outputs.enabled }}${{ steps.skip-if-redundant.outputs.enabled }}
skip_concurrent: ${{ steps.check-ref.outputs.skip_concurrent }}
steps:
- name: try to clone ci-config branch
run: |
git -c protocol.version=2 clone \
--no-tags \
--single-branch \
-b ci-config \
--depth 1 \
--no-checkout \
--filter=blob:none \
https://github.com/${{ github.repository }} \
config-repo &&
cd config-repo &&
git checkout HEAD -- ci/config || : ignore
- id: check-ref
name: check whether CI is enabled for ref
run: |
enabled=yes
if test -x config-repo/ci/config/allow-ref
then
echo "::warning::ci/config/allow-ref is deprecated; use CI_BRANCHES instead"
if ! config-repo/ci/config/allow-ref '${{ github.ref }}'
then
enabled=no
fi
fi
skip_concurrent=yes
if test -x config-repo/ci/config/skip-concurrent &&
! config-repo/ci/config/skip-concurrent '${{ github.ref }}'
then
skip_concurrent=no
fi
echo "enabled=$enabled" >>$GITHUB_OUTPUT
echo "skip_concurrent=$skip_concurrent" >>$GITHUB_OUTPUT
- name: skip if the commit or tree was already tested
id: skip-if-redundant
uses: actions/github-script@v8
if: steps.check-ref.outputs.enabled == 'yes'
with:
github-token: ${{secrets.GITHUB_TOKEN}}
script: |
try {
// Figure out workflow ID, commit and tree
const { data: run } = await github.rest.actions.getWorkflowRun({
owner: context.repo.owner,
repo: context.repo.repo,
run_id: context.runId,
});
const workflow_id = run.workflow_id;
const head_sha = run.head_sha;
const tree_id = run.head_commit.tree_id;
// See whether there is a successful run for that commit or tree
const { data: runs } = await github.rest.actions.listWorkflowRuns({
owner: context.repo.owner,
repo: context.repo.repo,
per_page: 500,
status: 'success',
workflow_id,
});
for (const run of runs.workflow_runs) {
if (head_sha === run.head_sha) {
core.warning(`Successful run for the commit ${head_sha}: ${run.html_url}`);
core.setOutput('enabled', ' but skip');
break;
}
if (run.head_commit && tree_id === run.head_commit.tree_id) {
core.warning(`Successful run for the tree ${tree_id}: ${run.html_url}`);
core.setOutput('enabled', ' but skip');
break;
}
}
} catch (e) {
core.warning(e);
}
windows-build:
name: win build
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
runs-on: windows-latest
concurrency:
group: windows-build-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- uses: git-for-windows/setup-git-for-windows-sdk@v1
- name: build
shell: bash
env:
HOME: ${{runner.workspace}}
NO_PERL: 1
run: . /etc/profile && ci/make-test-artifacts.sh artifacts
- name: zip up tracked files
run: git archive -o artifacts/tracked.tar.gz HEAD
- name: upload tracked files and build artifacts
uses: actions/upload-artifact@v5
with:
name: windows-artifacts
path: artifacts
windows-test:
name: win test
runs-on: windows-latest
needs: [ci-config, windows-build]
strategy:
fail-fast: false
matrix:
nr: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
concurrency:
group: windows-test-${{ matrix.nr }}-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- name: download tracked files and build artifacts
uses: actions/download-artifact@v6
with:
name: windows-artifacts
path: ${{github.workspace}}
- name: extract tracked files and build artifacts
shell: bash
run: tar xf artifacts.tar.gz && tar xf tracked.tar.gz
- uses: git-for-windows/setup-git-for-windows-sdk@v1
- name: test
shell: bash
run: . /etc/profile && ci/run-test-slice.sh $((${{matrix.nr}} + 1)) 10
- name: print test failures
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
shell: bash
run: ci/print-test-failures.sh
- name: Upload failed tests' directories
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
uses: actions/upload-artifact@v5
with:
name: failed-tests-windows-${{ matrix.nr }}
path: ${{env.FAILED_TEST_ARTIFACTS}}
vs-build:
name: win+VS build
needs: ci-config
if: github.event.repository.owner.login == 'git-for-windows' && needs.ci-config.outputs.enabled == 'yes'
env:
NO_PERL: 1
GIT_CONFIG_PARAMETERS: "'user.name=CI' 'user.email=ci@git'"
runs-on: windows-latest
concurrency:
group: vs-build-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- uses: git-for-windows/setup-git-for-windows-sdk@v1
- name: initialize vcpkg
uses: actions/checkout@v5
with:
repository: 'microsoft/vcpkg'
path: 'compat/vcbuild/vcpkg'
- name: download vcpkg artifacts
uses: git-for-windows/get-azure-pipelines-artifact@v0
with:
repository: git/git
definitionId: 9
- name: add msbuild to PATH
uses: microsoft/setup-msbuild@v2
- name: copy dlls to root
shell: cmd
run: compat\vcbuild\vcpkg_copy_dlls.bat release
- name: generate Visual Studio solution
shell: bash
run: |
cmake `pwd`/contrib/buildsystems/ -DCMAKE_PREFIX_PATH=`pwd`/compat/vcbuild/vcpkg/installed/x64-windows \
-DNO_GETTEXT=YesPlease -DPERL_TESTS=OFF -DPYTHON_TESTS=OFF -DCURL_NO_CURL_CMAKE=ON
- name: MSBuild
run: msbuild git.sln -property:Configuration=Release -property:Platform=x64 -maxCpuCount:4 -property:PlatformToolset=v142
- name: bundle artifact tar
shell: bash
env:
MSVC: 1
VCPKG_ROOT: ${{github.workspace}}\compat\vcbuild\vcpkg
run: |
mkdir -p artifacts &&
eval "$(make -n artifacts-tar INCLUDE_DLLS_IN_ARTIFACTS=YesPlease ARTIFACTS_DIRECTORY=artifacts NO_GETTEXT=YesPlease 2>&1 | grep ^tar)"
- name: zip up tracked files
run: git archive -o artifacts/tracked.tar.gz HEAD
- name: upload tracked files and build artifacts
uses: actions/upload-artifact@v5
with:
name: vs-artifacts
path: artifacts
vs-test:
name: win+VS test
runs-on: windows-latest
needs: [ci-config, vs-build]
strategy:
fail-fast: false
matrix:
nr: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
concurrency:
group: vs-test-${{ matrix.nr }}-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: git-for-windows/setup-git-for-windows-sdk@v1
- name: download tracked files and build artifacts
uses: actions/download-artifact@v6
with:
name: vs-artifacts
path: ${{github.workspace}}
- name: extract tracked files and build artifacts
shell: bash
run: tar xf artifacts.tar.gz && tar xf tracked.tar.gz
- name: test
shell: bash
env:
NO_SVN_TESTS: 1
run: . /etc/profile && ci/run-test-slice.sh $((${{matrix.nr}} + 1)) 10
- name: print test failures
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
shell: bash
run: ci/print-test-failures.sh
- name: Upload failed tests' directories
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
uses: actions/upload-artifact@v5
with:
name: failed-tests-windows-vs-${{ matrix.nr }}
path: ${{env.FAILED_TEST_ARTIFACTS}}
windows-meson-build:
name: win+Meson build
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
runs-on: windows-latest
concurrency:
group: windows-meson-build-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- uses: actions/setup-python@v6
- name: Set up dependencies
shell: pwsh
run: pip install meson ninja
- name: Setup
shell: pwsh
run: meson setup build --vsenv -Dbuildtype=release -Dperl=disabled -Dcredential_helpers=wincred
- name: Compile
shell: pwsh
run: meson compile -C build
- name: Upload build artifacts
uses: actions/upload-artifact@v5
with:
name: windows-meson-artifacts
path: build
windows-meson-test:
name: win+Meson test
runs-on: windows-latest
needs: [ci-config, windows-meson-build]
strategy:
fail-fast: false
matrix:
nr: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
concurrency:
group: windows-meson-test-${{ matrix.nr }}-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- uses: actions/setup-python@v6
- name: Set up dependencies
shell: pwsh
run: pip install meson ninja
- name: Download build artifacts
uses: actions/download-artifact@v6
with:
name: windows-meson-artifacts
path: build
- name: Test
shell: bash
run: ci/run-test-slice-meson.sh build $((${{matrix.nr}} + 1)) 10
- name: print test failures
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
shell: bash
run: ci/print-test-failures.sh
- name: Upload failed tests' directories
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
uses: actions/upload-artifact@v4
with:
name: failed-tests-windows-meson-${{ matrix.nr }}
path: ${{env.FAILED_TEST_ARTIFACTS}}
regular:
name: ${{matrix.vector.jobname}} (${{matrix.vector.pool}})
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
concurrency:
group: ${{ matrix.vector.jobname }}-${{ matrix.vector.pool }}-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
strategy:
fail-fast: false
matrix:
vector:
- jobname: osx-clang
cc: clang
pool: macos-14
- jobname: osx-reftable
cc: clang
pool: macos-14
- jobname: osx-gcc
cc: gcc-13
pool: macos-14
- jobname: osx-meson
cc: clang
pool: macos-14
env:
CC: ${{matrix.vector.cc}}
CC_PACKAGE: ${{matrix.vector.cc_package}}
jobname: ${{matrix.vector.jobname}}
CI_JOB_IMAGE: ${{matrix.vector.pool}}
TEST_OUTPUT_DIRECTORY: ${{github.workspace}}/t
runs-on: ${{matrix.vector.pool}}
steps:
- uses: actions/checkout@v5
- run: ci/install-dependencies.sh
- run: ci/run-build-and-tests.sh
- name: print test failures
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
run: ci/print-test-failures.sh
- name: Upload failed tests' directories
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
uses: actions/upload-artifact@v5
with:
name: failed-tests-${{matrix.vector.jobname}}
path: ${{env.FAILED_TEST_ARTIFACTS}}
fuzz-smoke-test:
name: fuzz smoke test
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
env:
CC: clang
CI_JOB_IMAGE: ubuntu-latest
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v5
- run: ci/install-dependencies.sh
- run: ci/run-build-and-minimal-fuzzers.sh
dockerized:
name: ${{matrix.vector.jobname}} (${{matrix.vector.image}})
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
concurrency:
group: dockerized-${{ matrix.vector.jobname }}-${{ matrix.vector.image }}-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
strategy:
fail-fast: false
matrix:
vector:
- jobname: linux-sha256
image: ubuntu:rolling
cc: clang
- jobname: linux-reftable
image: ubuntu:rolling
cc: clang
- jobname: linux-TEST-vars
image: ubuntu:20.04
cc: gcc
cc_package: gcc-8
- jobname: linux-breaking-changes
cc: gcc
image: ubuntu:rolling
- jobname: fedora-breaking-changes-meson
image: fedora:latest
- jobname: linux-leaks
image: ubuntu:rolling
cc: gcc
- jobname: linux-reftable-leaks
image: ubuntu:rolling
cc: gcc
- jobname: linux-asan-ubsan
image: ubuntu:rolling
cc: clang
- jobname: linux-meson
image: ubuntu:rolling
cc: gcc
- jobname: linux-musl-meson
image: alpine:latest
# Supported until 2025-04-02.
- jobname: linux32
image: i386/ubuntu:focal
# A RHEL 8 compatible distro. Supported until 2029-05-31.
- jobname: almalinux-8
image: almalinux:8
# Supported until 2026-08-31.
- jobname: debian-11
image: debian:11
env:
jobname: ${{matrix.vector.jobname}}
CC: ${{matrix.vector.cc}}
CI_JOB_IMAGE: ${{matrix.vector.image}}
CUSTOM_PATH: /custom
runs-on: ubuntu-latest
container:
image: ${{ matrix.vector.image }}
options: ${{ github.repository_visibility == 'private' && '--pids-limit 16384 --ulimit nproc=16384:16384 --ulimit nofile=32768:32768' || '' }}
steps:
- name: prepare libc6 for actions
if: matrix.vector.jobname == 'linux32'
run: apt -q update && apt -q -y install libc6-amd64 lib64stdc++6
- name: install git in container
run: |
if command -v git
then
: # nothing to do
elif command -v apk
then
apk add --update git
elif command -v dnf
then
dnf -yq update && dnf -yq install git
else
apt-get -q update && apt-get -q -y install git
fi
- uses: actions/checkout@v5
- run: ci/install-dependencies.sh
- run: useradd builder --create-home
- run: chown -R builder .
- run: chmod a+w $GITHUB_ENV && sudo --preserve-env --set-home --user=builder ci/run-build-and-tests.sh
- name: print test failures
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
run: sudo --preserve-env --set-home --user=builder ci/print-test-failures.sh
- name: Upload failed tests' directories
if: failure() && env.FAILED_TEST_ARTIFACTS != ''
uses: actions/upload-artifact@v5
with:
name: failed-tests-${{matrix.vector.jobname}}
path: ${{env.FAILED_TEST_ARTIFACTS}}
static-analysis:
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
env:
jobname: StaticAnalysis
CI_JOB_IMAGE: ubuntu-22.04
runs-on: ubuntu-22.04
concurrency:
group: static-analysis-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- run: ci/install-dependencies.sh
- run: ci/run-static-analysis.sh
- run: ci/check-directional-formatting.bash
rust-analysis:
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
env:
jobname: RustAnalysis
CI_JOB_IMAGE: ubuntu:rolling
runs-on: ubuntu-latest
container: ubuntu:rolling
concurrency:
group: rust-analysis-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- run: ci/install-dependencies.sh
- run: ci/run-rust-checks.sh
sparse:
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
env:
jobname: sparse
CI_JOB_IMAGE: ubuntu-22.04
runs-on: ubuntu-22.04
concurrency:
group: sparse-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
steps:
- uses: actions/checkout@v5
- name: Install other dependencies
run: ci/install-dependencies.sh
- run: make sparse
documentation:
name: documentation
needs: ci-config
if: needs.ci-config.outputs.enabled == 'yes'
concurrency:
group: documentation-${{ github.ref }}
cancel-in-progress: ${{ needs.ci-config.outputs.skip_concurrent == 'yes' }}
env:
jobname: Documentation
CI_JOB_IMAGE: ubuntu-latest
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v5
- run: ci/install-dependencies.sh
- run: ci/test-documentation.sh