f6ba97cea1
fa70e23de7ci: Drop libFuzzer from msan fuzz task (MarcoFalke) Pull request description: libFuzzer is mostly unmaintained (https://llvm.org/docs/LibFuzzer.html#status), and it isn't really needed by the CI tasks. While it provides some additional stats like rss or the max input byte size, they are not essential. Dropping libFuzzer here would also drop the "60 seconds sanity check" for empty folders, but I think this is an acceptable price to pay to silence false-positives that were hit for years. Also, there seems to be a history of intermittent false-positive msan warnings (https://github.com/bitcoin/bitcoin/pull/33600#issuecomment-3391921802). It is unclear what exactly is causing the false-positives, so just disable libFuzzer in this task for now, to work around them. ACKs for top commit: kevkevinpal: ACK [fa70e23](fa70e23de7) dergoegge: ACKfa70e23de7Tree-SHA512: c3e5958b8378ba30f51d923f97a84dec2ee60af8b9c2a4f13bc8de486a490031468371120e421384aa198ffec591db554e636935ab3c6d4de5e870238f5079f2
CI Scripts
This directory contains scripts for each build step in each build stage.
Running a Stage Locally
Be aware that the tests will be built and run in-place, so please run at your own risk. If the repository is not a fresh git clone, you might have to clean files from previous builds or test runs first.
The ci needs to perform various sysadmin tasks such as installing packages or writing to the user's home directory. While it should be fine to run the ci system locally on your development box, the ci scripts can generally be assumed to have received less review and testing compared to other parts of the codebase. If you want to keep the work tree clean, you might want to run the ci system in a virtual machine with a Linux operating system of your choice.
To allow for a wide range of tested environments, but also ensure reproducibility to some extent, the test stage
requires bash, docker, and python3 to be installed. To run on different architectures than the host qemu is also required. To install all requirements on Ubuntu, run
sudo apt install bash docker.io python3 qemu-user-static
For some sanitizer builds, the kernel's address-space layout randomization (ASLR) entropy can cause sanitizer shadow memory mappings to fail. When running the CI locally you may need to reduce that entropy by running:
sudo sysctl -w vm.mmap_rnd_bits=28
It is recommended to run the ci system in a clean env. To run the test stage with a specific configuration,
env -i HOME="$HOME" PATH="$PATH" USER="$USER" bash -c 'FILE_ENV="./ci/test/00_setup_env_arm.sh" ./ci/test_run_all.sh'
Configurations
The test files (FILE_ENV) are constructed to test a wide range of
configurations, rather than a single pass/fail. This helps to catch build
failures and logic errors that present on platforms other than the ones the
author has tested.
Some builders use the dependency-generator in ./depends, rather than using
the system package manager to install build dependencies. This guarantees that
the tester is using the same versions as the release builds, which also use
./depends.
It is also possible to force a specific configuration without modifying the file. For example,
env -i HOME="$HOME" PATH="$PATH" USER="$USER" bash -c 'MAKEJOBS="-j1" FILE_ENV="./ci/test/00_setup_env_arm.sh" ./ci/test_run_all.sh'
The files starting with 0n (n greater than 0) are the scripts that are run
in order.
Cache
In order to avoid rebuilding all dependencies for each build, the binaries are cached and reused when possible. Changes in the dependency-generator will trigger cache-invalidation and rebuilds as necessary.
Configuring a repository for CI
Primary repository
To configure the primary repository, follow these steps:
- Register with Cirrus Runners and purchase runners.
- Install the Cirrus Runners GitHub app against the GitHub organization.
- Enable organisation-level runners to be used in public repositories:
Org settings -> Actions -> Runner Groups -> Default -> Allow public repos
- Permit the following actions to run:
- cirruslabs/cache/restore@*
- cirruslabs/cache/save@*
- docker/setup-buildx-action@*
- actions/github-script@*
Forked repositories
When used in a fork the CI will run on GitHub's free hosted runners by default. In this case, due to GitHub's 10GB-per-repo cache size limitations caches will be frequently evicted and missed, but the workflows will run (slowly).
It is also possible to use your own Cirrus Runners in your own fork with an appropriate patch to the REPO_USE_CIRRUS_RUNNERS variable in ../.github/workflows/ci.yml
NB that Cirrus Runners only work at an organisation level, therefore in order to use your own Cirrus Runners, the fork must be within your own organisation.