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systemd/docs/CODE_QUALITY.md
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Code Quality Tools

Code Quality Tools

The systemd project has a number of code quality tools set up in the source tree and on the github infrastructure. Here's an incomprehensive list of the available functionality:

  1. Use ninja -C build test to run the unit tests. Some tests are skipped if no privileges are available, hence consider also running them with sudo ninja -C build test. A couple of unit tests are considered "unsafe" (as they change system state); to run those too, build with meson -Dtests=unsafe. Finally, some unit tests are considered to be very slow, build them too with meson -Dslow-tests=true. (Note that there are a couple of manual tests in addition to these unit tests.)

  2. Use ./test/run-integration-tests.sh to run the full integration test suite. This will build OS images with a number of integration tests and run them in nspawn and qemu. Requires root.

  3. Use ./coccinelle/run-coccinelle.sh to run all Coccinelle semantic patch scripts we ship. The output will show false positives, hence take it with a pinch of salt.

  4. Use ./tools/find-double-newline.sh recdiff to find double newlines. Use ./tools/find-double-newline.sh recpatch to fix them. Take this with a grain of salt, in particular as we generally leave foreign header files we include in our tree unmodified, if possible.

  5. Similar use ./tools/find-tabs.sh recdiff to find TABs, and ./tools/find-tabs.sh recpatch to fix them. (Again, grain of salt, foreign headers should usually be left unmodified.)

  6. Use ninja -C build check-api-docs to compare the list of exported symbols of libsystemd.so and libudev.so with the list of man pages. Symbols lacking documentation are highlighted.

  7. Use ninja -C build hwdb-update to automatically download and import the PCI, USB and OUI databases into hwdb.

  8. Use ninja -C build man/update-man-rules to update the meson rules for building man pages automatically from the docbook XML files included in man/.

  9. There are multiple CI systems in use that run on every github PR submission.

  10. Coverity is analyzing systemd master in regular intervals. The reports are available online.

  11. oss-fuzz is continuously fuzzing the codebase. Reports are available online.

  12. Our tree includes .editorconfig, .dir-locals.el and .vimrc files, to ensure that editors follow the right indentiation styles automatically.

  13. When building systemd from a git checkout the build scripts will automatically enable a git commit hook that ensures whitespace cleanliness.

  14. LGTM analyzes every commit pushed to master. The list of active alerts can be found here.

  15. Each PR is automatically tested with Address Sanitizer and Undefined Behavior Sanitizer. See Testing systemd using sanitizers for more information.

Access to Coverity and oss-fuzz reports is limited. Please reach out to the maintainers if you need access.