ffe4261cb0
fa71bedf8609f06618aa85342ea6f5c4d2c5fea0 ci: Approximate MAKEJOBS in image build phase (MarcoFalke)
Pull request description:
The `MAKEJOBS` env var is the default in image builds, which is fine, because it is only relevant when building msan (or iwyu) and only differs when setting MAKEJOBS to something other than `nproc` (currently used as an approximation).
So the normal workflow of `MAKEJOBS="-j$(nproc)" FILE_ENV="./ci/test/00_setup_env_native_msan.sh" ./ci/test_run_all.sh` already works today.
However, `MAKEJOBS="-j1" FILE_ENV="./ci/test/00_setup_env_native_msan.sh" ./ci/test_run_all.sh` does not.
This is hard to fix, because making the env var a build arg means that changing it (and only it) requires a new (expensive and redundant) build.
So add an option `HAVE_CGROUP_CPUSET`, which can be set to approximate `MAKEJOBS` a bit. Can be tested via:
`HAVE_CGROUP_CPUSET=yo MAKEJOBS="-j_something" FILE_ENV="./ci/test/00_setup_env_native_msan.sh" ./ci/test_run_all.sh`
ACKs for top commit:
fanquake:
ACK fa71bedf8609f06618aa85342ea6f5c4d2c5fea0
Tree-SHA512: 43ef194c71d726f4cfa3fe08a5894c7872150f37da7e4fa0c2d89e4572bc63acadb5dae3286a5e5cc14a8ce3e1ebcc14571f1a3541e8db2d18d2f7503764a2f3
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 you 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
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.