# Integration tests ## Running the integration tests with meson + mkosi To run the integration tests with meson + mkosi, make sure you're running the latest version of mkosi. See [`docs/HACKING.md`](https://github.com/systemd/systemd/blob/main/docs/HACKING.md) for more specific details. Make sure `mkosi` is available in `$PATH` when reconfiguring meson to make sure it is picked up properly. We also need to make sure the required meson options are enabled: ```shell $ meson setup --reconfigure build -Dremote=enabled ``` To make sure `mkosi` doesn't try to build systemd from source during the image build process, you can add the following to `mkosi.local.conf`: ``` [Content] Environment=NO_BUILD=1 ``` You might also want to use the `PackageDirectories=` or `Repositories=` option to provide mkosi with a directory or repository containing the systemd packages that should be installed instead. If the repository containing the systemd packages is not a builtin repository known by mkosi, you can use the `PackageManagerTrees=` option to write an extra repository definition to /etc which is used when building the image instead. Next, we can build the integration test image with meson: ```shell $ meson compile -C build mkosi ``` By default, the `mkosi` meson target which builds the integration test image depends on other meson targets to build various systemd tools that are used to build the image to make sure they are up-to-date. If you instead want the already installed systemd tools on the host to be used, you can run `mkosi` manually to build the image. To build the integration test image without meson, run the following: ```shell $ mkosi -f ``` Note that by default we assume that `build/` is used as the meson build directory that will be used to run the integration tests. If you want to use another directory as the meson build directory, you will have to configure the mkosi build directory (`BuildDirectory=`), cache directory (`CacheDirectory=`) and output directory (`OutputDirectory=`) to point to the other directory using `mkosi.local.conf`. After the image has been built, the integration tests can be run with: ```shell $ SYSTEMD_INTEGRATION_TESTS=1 meson test -C build --no-rebuild --suite integration-tests --num-processes "$(($(nproc) / 4))" ``` As usual, specific tests can be run in meson by appending the name of the test which is usually the name of the directory e.g. ```shell $ SYSTEMD_INTEGRATION_TESTS=1 meson test -C build --no-rebuild -v TEST-01-BASIC ``` See `meson introspect build --tests` for a list of tests. To interactively debug a failing integration test, the `--interactive` option (`-i`) for `meson test` can be used. Note that this requires meson v1.5.0 or newer: ```shell $ SYSTEMD_INTEGRATION_TESTS=1 meson test -C build --no-rebuild -i TEST-01-BASIC ``` Due to limitations in meson, the integration tests do not yet depend on the mkosi target, which means the mkosi target has to be manually rebuilt before running the integration tests. To rebuild the image and rerun a test, the following command can be used: ```shell $ meson compile -C build mkosi && SYSTEMD_INTEGRATION_TESTS=1 meson test -C build --no-rebuild -v TEST-01-BASIC ``` The integration tests use the same mkosi configuration that's used when you run mkosi in the systemd reposistory, so any local modifications to the mkosi configuration (e.g. in `mkosi.local.conf`) are automatically picked up and used by the integration tests as well. ## Iterating on an integration test To iterate on an integration test, let's first get a shell in the integration test environment by running the following: ```shell $ meson compile -C build mkosi && SYSTEMD_INTEGRATION_TESTS=1 TEST_SHELL=1 meson test -C build --no-rebuild -i TEST-01-BASIC ``` This will get us a shell in the integration test environment after booting the machine without running the integration test itself. After booting, we can verify the integration test passes by running it manually, for example with `systemctl start TEST-01-BASIC`. Now you can extend the test in whatever way you like to add more coverage of existing features or to add coverage for a new feature. Once you've finished writing the logic and want to rerun the test, run the the following on the host: ```shell $ mkosi -t none ``` This will rebuild the distribution packages without rebuilding the entire integration test image. Next, run the following in the integration test machine: ```shell $ systemctl soft-reboot $ systemctl start TEST-01-BASIC ``` A soft-reboot is required to make sure all the leftover state from the previous run of the test is cleaned up by soft-rebooting into the btrfs snapshot we made before running the test. After the soft-reboot, re-running the test will first install the new packages we just built, make a new snapshot and finally run the test again. You can keep running the loop of `mkosi -t none`, `systemctl soft-reboot` and `systemctl start ...` until the changes to the integration test are working. If you're debugging a failing integration test (running `meson test --interactive` without `TEST_SHELL`), there's no need to run `systemctl start ...`, running `systemctl soft-reboot` on its own is sufficient to rerun the test. ## Running the integration tests the old fashioned way The extended testsuite only works with UID=0. It consists of the subdirectories named `test/TEST-??-*`, each of which contains a description of an OS image and a test which consists of systemd units and scripts to execute in this image. The same image is used for execution under `systemd-nspawn` and `qemu`. To run the extended testsuite do the following: ```shell $ ninja -C build # Avoid building anything as root later $ sudo test/run-integration-tests.sh ninja: Entering directory `/home/zbyszek/src/systemd/build' ninja: no work to do. --x-- Running TEST-01-BASIC --x-- + make -C TEST-01-BASIC clean setup run make: Entering directory '/home/zbyszek/src/systemd/test/TEST-01-BASIC' TEST-01-BASIC CLEANUP: Basic systemd setup TEST-01-BASIC SETUP: Basic systemd setup ... TEST-01-BASIC RUN: Basic systemd setup [OK] make: Leaving directory '/home/zbyszek/src/systemd/test/TEST-01-BASIC' --x-- Result of TEST-01-BASIC: 0 --x-- --x-- Running TEST-02-CRYPTSETUP --x-- + make -C TEST-02-CRYPTSETUP clean setup run ``` If one of the tests fails, then $subdir/test.log contains the log file of the test. To run just one of the cases: ```shell $ sudo make -C test/TEST-01-BASIC clean setup run ``` ### Specifying the build directory If the build directory is not detected automatically, it can be specified with BUILD_DIR=: ```shell $ sudo BUILD_DIR=some-other-build/ test/run-integration-tests ``` or ```shell $ sudo make -C test/TEST-01-BASIC BUILD_DIR=../../some-other-build/ ... ``` Note that in the second case, the path is relative to the test case directory. An absolute path may also be used in both cases. ### Testing installed binaries instead of built To run the extended testsuite using the systemd installed on the system instead of the systemd from a build, use the NO_BUILD=1: ```shell $ sudo NO_BUILD=1 test/run-integration-tests ``` ### Configuration variables `TEST_NO_QEMU=1`: Don't run tests under qemu. `TEST_QEMU_ONLY=1`: Run only tests that require qemu. `TEST_NO_NSPAWN=1`: Don't run tests under systemd-nspawn. `TEST_PREFER_NSPAWN=1`: Run all tests that do not require qemu under systemd-nspawn. `TEST_NO_KVM=1`: Disable qemu KVM auto-detection (may be necessary when you're trying to run the *vanilla* qemu and have both qemu and qemu-kvm installed) `QEMU_MEM=512M`: Configure amount of memory for qemu VMs (defaults to 512M). `QEMU_SMP=1`: Configure number of CPUs for qemu VMs (defaults to 1). `KERNEL_APPEND='...'`: Append additional parameters to the kernel command line. `NSPAWN_ARGUMENTS='...'`: Specify additional arguments for systemd-nspawn. `QEMU_TIMEOUT=infinity`: Set a timeout for tests under qemu (defaults to 1800 sec). `NSPAWN_TIMEOUT=infinity`: Set a timeout for tests under systemd-nspawn (defaults to 1800 sec). `TEST_SHELL=1`: Configure the machine to be more *user-friendly* for interactive debugging (e.g. by setting a usable default terminal, suppressing the shutdown after the test, etc.). `TEST_MATCH_SUBTEST=subtest`: If the test makes use of `run_subtests` use this variable to provide a POSIX extended regex to run only subtests matching the expression. `TEST_MATCH_TESTCASE=testcase`: Same as $TEST_MATCH_SUBTEST but for subtests that make use of `run_testcases`. The kernel and initrd can be specified with $KERNEL_BIN and $INITRD. (Fedora's or Debian's default kernel path and initrd are used by default.) A script will try to find your qemu binary. If you want to specify a different one with `$QEMU_BIN`. `TEST_SKIP`: takes a space separated list of tests to skip. ### Debugging the qemu image If you want to log in the testsuite virtual machine, use `TEST_SHELL=1` and log in as root: ```shell $ sudo make -C test/TEST-01-BASIC TEST_SHELL=1 run ``` The root password is empty. ## Ubuntu CI New PRs submitted to the project are run through regression tests, and one set of those is the 'autopkgtest' runs for several different architectures, called 'Ubuntu CI'. Part of that testing is to run all these tests. Sometimes these tests are temporarily deny-listed from running in the 'autopkgtest' tests while debugging a flaky test; that is done by creating a file in the test directory named 'deny-list-ubuntu-ci', for example to prevent the TEST-01-BASIC test from running in the 'autopkgtest' runs, create the file 'TEST-01-BASIC/deny-list-ubuntu-ci'. The tests may be disabled only for specific archs, by creating a deny-list file with the arch name at the end, e.g. 'TEST-01-BASIC/deny-list-ubuntu-ci-arm64' to disable the TEST-01-BASIC test only on test runs for the 'arm64' architecture. Note the arch naming is not from 'uname -m', it is Debian arch names: https://wiki.debian.org/ArchitectureSpecificsMemo For PRs that fix a currently deny-listed test, the PR should include removal of the deny-list file. In case a test fails, the full set of artifacts, including the journal of the failed run, can be downloaded from the artifacts.tar.gz archive which will be reachable in the same URL parent directory as the logs.gz that gets linked on the Github CI status. The log URL can be derived following a simple algorithm, however the test completion timestamp is needed and it's not easy to find without access to the log itself. For example, a noble s390x job started on 2024-03-23 at 02:09:11 will be stored at the following URL: https://autopkgtest.ubuntu.com/results/autopkgtest-noble-upstream-systemd-ci-systemd-ci/noble/s390x/s/systemd-upstream/20240323_020911_e8e88@/log.gz Fortunately a list of URLs listing file paths for recently completed test runs is available at: https://autopkgtest.ubuntu.com/results/autopkgtest-noble-upstream-systemd-ci-systemd-ci/ paths listed at this URL can be appended to the URL to download them. Unfortunately there are too many results and the web server cannot list them all at once. Fortunately there is a workaround: copy the last line on the page, and append it to the URL, with a '?marker=' prefix, and the web server will show the next page of results. For example: https://autopkgtest.ubuntu.com/results/autopkgtest-noble-upstream-systemd-ci-systemd-ci/?marker=noble/amd64/s/systemd-upstream/20240616_211635_5993a@/result.tar The 5 characters at the end of the last directory are not random, but the first 5 characters of a SHA1 hash generated based on the set of parameters given to the build plus the completion timestamp, such as: ```shell $ echo -n 'systemd-upstream {"build-git": "https://salsa.debian.org/systemd-team/systemd.git#debian/master", "env": ["UPSTREAM_REPO=https://github.com/systemd/systemd.git", "CFLAGS=-O0", "DEB_BUILD_PROFILES=pkg.systemd.upstream noudeb", "TEST_UPSTREAM=1", "CONFFLAGS_UPSTREAM=--werror -Dslow-tests=true", "UPSTREAM_PULL_REQUEST=31444", "GITHUB_STATUSES_URL=https://api.github.com/repos/systemd/systemd/statuses/c27f600a1c47f10b22964eaedfb5e9f0d4279cd9"], "ppas": ["upstream-systemd-ci/systemd-ci"], "submit-time": "2024-02-27 17:06:27", "uuid": "02cd262f-af22-4f82-ac91-53fa5a9e7811"}' | sha1sum | cut -c1-5 ``` To add new dependencies or new binaries to the packages used during the tests, a merge request can be sent to: https://salsa.debian.org/systemd-team/systemd targeting the 'upstream-ci' branch. The cloud-side infrastructure, that is hooked into the Github interface, is located at: https://git.launchpad.net/autopkgtest-cloud/ A generic description of the testing infrastructure can be found at: https://wiki.ubuntu.com/ProposedMigration/AutopkgtestInfrastructure In case of infrastructure issues with this CI, things might go wrong in two places: - starting a job: this is done via a Github webhook, so check if the HTTP POST are failing on https://github.com/systemd/systemd/settings/hooks - running a job: all currently running jobs are listed at https://autopkgtest.ubuntu.com/running#pkg-systemd-upstream in case the PR does not show the status for some reason - reporting the job result: this is done on Canonical's cloud infrastructure, if jobs are started and running but no status is visible on the PR, then it is likely that reporting back is not working The CI job needs a PPA in order to be accepted, and the upstream-systemd-ci/systemd-ci PPA is used. Note that this is necessary even when there are no packages to backport, but by default a PPA won't have a repository for a release if there are no packages built for it. To work around this problem, when a new empty release is needed the mark-suite-dirty tool from the https://git.launchpad.net/ubuntu-archive-tools can be used to force the PPA to publish an empty repository, for example: ```shell $ ./mark-suite-dirty -A ppa:upstream-systemd-ci/ubuntu/systemd-ci -s noble ``` will create an empty 'noble' repository that can be used for 'noble' CI jobs. For infrastructure help, reaching out to 'qa-help' via the #ubuntu-quality channel on libera.chat is an effective way to receive support in general. Given access to the shared secret, tests can be re-run using the generic retry-github-test tool: https://git.launchpad.net/autopkgtest-cloud/tree/charms/focal/autopkgtest-cloud-worker/autopkgtest-cloud/tools/retry-github-test A wrapper script that makes it easier to use is also available: https://piware.de/gitweb/?p=bin.git;a=blob;f=retry-gh-systemd-Test ## Manually running a part of the Ubuntu CI test suite In some situations one may want/need to run one of the tests run by Ubuntu CI locally for debugging purposes. For this, you need a machine (or a VM) with the same Ubuntu release as is used by Ubuntu CI (Jammy ATTOW). First of all, clone the Debian systemd repository and sync it with the code of the PR (set by the `$UPSTREAM_PULL_REQUEST` env variable) you'd like to debug: ```shell $ git clone https://salsa.debian.org/systemd-team/systemd.git $ cd systemd $ git checkout upstream-ci $ TEST_UPSTREAM=1 UPSTREAM_PULL_REQUEST=12345 ./debian/extra/checkout-upstream ``` Now install necessary build & test dependencies: ```shell # PPA with some newer Ubuntu packages required by upstream systemd $ add-apt-repository -y --enable-source ppa:upstream-systemd-ci/systemd-ci $ apt build-dep -y systemd $ apt install -y autopkgtest debhelper genisoimage git qemu-system-x86 \ libcurl4-openssl-dev libfdisk-dev libtss2-dev libfido2-dev \ libssl-dev python3-pefile ``` Build systemd deb packages with debug info: ```shell $ TEST_UPSTREAM=1 DEB_BUILD_OPTIONS="nocheck nostrip noopt" dpkg-buildpackage -us -uc $ cd .. ``` Prepare a testbed image for autopkgtest (tweak the release as necessary): ```shell $ autopkgtest-buildvm-ubuntu-cloud --ram-size 1024 -v -a amd64 -r jammy ``` And finally run the autopkgtest itself: ```shell $ autopkgtest -o logs *.deb systemd/ \ --env=TEST_UPSTREAM=1 \ --timeout-factor=3 \ --test-name=boot-and-services \ --shell-fail \ -- autopkgtest-virt-qemu --cpus 4 --ram-size 2048 autopkgtest-jammy-amd64.img ``` where `--test-name=` is the name of the test you want to run/debug. The `--shell-fail` option will pause the execution in case the test fails and shows you the information how to connect to the testbed for further debugging. ## Manually running CodeQL analysis This is mostly useful for debugging various CodeQL quirks. Download the CodeQL Bundle from https://github.com/github/codeql-action/releases and unpack it somewhere. From now the 'tutorial' assumes you have the `codeql` binary from the unpacked archive in $PATH for brevity. Switch to the systemd repository if not already: ```shell $ cd ``` Create an initial CodeQL database: ```shell $ CCACHE_DISABLE=1 codeql database create codeqldb --language=cpp -vvv ``` Disabling ccache is important, otherwise you might see CodeQL complaining: No source code was seen and extracted to /home/mrc0mmand/repos/@ci-incubator/systemd/codeqldb. This can occur if the specified build commands failed to compile or process any code. - Confirm that there is some source code for the specified language in the project. - For codebases written in Go, JavaScript, TypeScript, and Python, do not specify an explicit --command. - For other languages, the --command must specify a "clean" build which compiles all the source code files without reusing existing build artefacts. If you want to run all queries systemd uses in CodeQL, run: ```shell $ codeql database analyze codeqldb/ --format csv --output results.csv .github/codeql-custom.qls .github/codeql-queries/*.ql -vvv ``` Note: this will take a while. If you're interested in a specific check, the easiest way (without hunting down the specific CodeQL query file) is to create a custom query suite. For example: ```shell $ cat >test.qls <` to filter out defects for a specific file, `--checker-regex DEFECT_TYPE` to filter our only a specific defect (if this wasn't done already by cov-analyze), and many others, see `--help` for an exhaustive list. ## Code coverage We have a daily cron job in CentOS CI which runs all unit and integration tests, collects coverage using gcov/lcov, and uploads the report to [Coveralls](https://coveralls.io/github/systemd/systemd). In order to collect the most accurate coverage information, some measures have to be taken regarding sandboxing, namely: - ProtectSystem= and ProtectHome= need to be turned off - the $BUILD_DIR with necessary .gcno files needs to be present in the image and needs to be writable by all processes The first point is relatively easy to handle and is handled automagically by our test "framework" by creating necessary dropins. Making the `$BUILD_DIR` accessible to _everything_ is slightly more complicated. First, and foremost, the `$BUILD_DIR` has a POSIX ACL that makes it writable to everyone. However, this is not enough in some cases, like for services that use DynamicUser=yes, since that implies ProtectSystem=strict that can't be turned off. A solution to this is to use `ReadWritePaths=$BUILD_DIR`, which works for the majority of cases, but can't be turned on globally, since ReadWritePaths= creates its own mount namespace which might break some services. Hence, the `ReadWritePaths=$BUILD_DIR` is enabled for all services with the `test-` prefix (i.e. test-foo.service or test-foo-bar.service), both in the system and the user managers. So, if you're considering writing an integration test that makes use of DynamicUser=yes, or other sandboxing stuff that implies it, please prefix the test unit (be it a static one or a transient one created via systemd-run), with `test-`, unless the test unit needs to be able to install mount points in the main mount namespace - in that case use `IGNORE_MISSING_COVERAGE=yes` in the test definition (i.e. `TEST-*-NAME/test.sh`), which will skip the post-test check for missing coverage for the respective test.