Add 'catch' option

The catch option makes test run via 'catch'[1], which will log
backtraces whenever an abort or segmentation fault happens in any of the
subprocesses. The aim is to enable this when running in CI to help
debugging crashes that only tend to happen in CI.

While it's possible to wrap the whole meson command in 'catch', doing so
doesn't cover the KVM tests, so this option is added instead that covers
both cases.

[1] https://gitlab.gnome.org/jadahl/catch/

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2561>

meson.build

@@ -353,8 +353,16 @@ if have_tests
   meta_dbus_runner = find_program('src/tests/meta-dbus-runner.py')
   default_test_wrappers = [
     meta_dbus_runner,
+    '--',
   ]
 
+  if get_option('catch')
+    catch = find_program('catch')
+    default_test_wrappers += [
+      catch,
+    ]
+  endif
+
   add_test_setup('default',
     is_default: true,
     exe_wrapper: default_test_wrappers,

meson_options.txt

@@ -206,3 +206,9 @@ option('xwayland_initfd',
   value: 'auto',
   description: 'Whether -initfd argument is passed to Xwayland to guarantee services (e.g. gsd-xsettings) startup before applications'
 )
+
+option('catch',
+  type: 'boolean',
+  value: false,
+  description: 'Use catch to catch backtraces'
+)

src/tests/kvm/meson.build

@@ -27,6 +27,12 @@ endif
 
 virtme_run = find_program('virtme-run.sh')
 
+if get_option('catch')
+  kvm_wrapper = catch.full_path()
+else
+  kvm_wrapper = []
+endif
+
 foreach test_case: privileged_tests
   vm_env_entries = []
   foreach name, value: test_case['variables']
@@ -47,6 +53,7 @@ foreach test_case: privileged_tests
       '--kvm',
       meson.current_build_dir(),
       vm_env,
+      kvm_wrapper,
       test_case['executable'].full_path(),
     ],
     is_parallel: false,