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# Tracker HACKING guide
This file contains information useful for developers who want to improve
the tracker and tracker-miners projects.
## Automated testing
You can run the Tracker testsuite using the `meson test` command.
Tracker runs the tests automatically in GitLab CI. The .gitlab-ci.yml file
controls this. Here are the latest tests that were run:
* https://gitlab.gnome.org/GNOME/tracker/pipelines
* https://gitlab.gnome.org/GNOME/tracker-miners/pipelines
Some distros also run the test suite, including these:
* Ubuntu autopkgtest: https://autopkgtest.ubuntu.com/packages/tracker/
* Debian builds: https://buildd.debian.org/status/package.php?p=tracker
* Debian reproducible-builds:
* https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/tracker.html
* https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/tracker-miners.html
OpenSuSE do automated whole-system testing that includes the GNOME desktop for their Tumbleweed rolling release distro: https://openqa.opensuse.org/group_overview/1
## Logging
The following environment variables control logging from Tracker daemons:
* `TRACKER_VERBOSITY`: takes a value of 1, 2 or 3 and causes increasing
amounts of log output from Tracker code to be written to stdout.
* `G_MESSAGES_DEBUG`: controls log output from GLib-based libraries that
are used in the Tracker process. Use `G_MESSAGES_DEBUG=all` for maximal
log output.
Internally, Tracker will set `G_MESSAGES_DEBUG=Tracker` if `TRACKER_VERBOSITY`
is set and `G_MESSAGES_DEBUG` is not set, to enable printing of its own log
messages to stdout.
You can set these variables when using `tracker-sandbox`, and when running the
Tracker test suite. Note that Meson will not print log output from tests by
default, use `meson test --verbose` or `meson test --print-errorlogs` to
enable.
The functional tests understand an additional variable, `TRACKER_TESTS_VERBOSE`
with can be set to `1` or `yes` to see detailed logging from the test harness
itself, and full log output from the internal D-Bus daemon. By default, these
tests filter output from the D-Bus daemon to only show log messages from
Tracker processes. Anything written directly to stdout, for example by
`g_print()` or by the dbus-daemon itself, will not be displayed unless
`TRACKER_TESTS_VERBOSE` is set.
When working with GitLab CI, you can use the
[Run Pipeline dialog](https://gitlab.gnome.org/GNOME/tracker/pipelines/new)
to set the values of these variables and increase the verbosity of the tests in
CI.
## Attaching a debugger to Tracker daemons
Tracker daemons are not started directly. Instead they are started by the D-Bus
daemon by request. When using the run-uninstalled script or the
functional-tests, it's difficult to start the daemon manually under `gdb`.
Instead, we recommend adding a 10 second timeout at the top of the daemon's
main() function. In Vala code, try this:
print("Pausing to attach debugger. Run: gdb attach %i\n", Posix.getpid());
Posix.usleep(10 * 1000 * 1000);
print("Waking up again\n");
Run the test, using the `meson build --timeout-multiplier=10000`
option to avoid your process being killed by the test runner. When you see
the 'Pausing' message, run the `gdb attach``command in another terminal within
10 seconds.
## Running Tracker daemons under Valgrind
The Tracker daemons are launched using D-Bus autolaunch. When running them from
the source tree using the run-uninstalled script or the functional-tests, the
commandline is controlled by the D-Bus .service.in files stored in
`./tests/services`. Just change the `Exec=` line to add Valgrind, like this:
Exec=/usr/bin/valgrind @abs_top_builddir@/src/tracker-store/tracker-store
By default the run-uninstalled script and the functional-tests will only show
output from Tracker code. For the functional-tests, set TRACKER_TESTS_VERBOSE=1
to see output from Valgrind. For tracker-sandbox use the `--debug-dbus` option.
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