tests: skip test_exec_ambientcapabilities on Travis CI under ASan

Let's not bother contributors with spurious failures nobody can't
seem to reproduce. There is an issue about that where we're trying
to figure out what's going on: https://github.com/systemd/systemd/issues/10696.

src/test/test-execute.c

@@ -616,6 +616,13 @@ static void test_exec_ambientcapabilities(Manager *m) {
                 return;
         }
 
+#ifdef __SANITIZE_ADDRESS__
+        if (is_run_on_travis_ci()) {
+                log_notice("Skipping %s, see https://github.com/systemd/systemd/issues/10696", __func__);
+                return;
+        }
+#endif
+
         test(m, "exec-ambientcapabilities.service", 0, CLD_EXITED);
         test(m, "exec-ambientcapabilities-merge.service", 0, CLD_EXITED);
 

src/test/test-helper.c

@@ -4,6 +4,7 @@
 #include "random-util.h"
 #include "alloc-util.h"
 #include "cgroup-util.h"
+#include "string-util.h"
 
 int enter_cgroup_subroot(void) {
         _cleanup_free_ char *cgroup_root = NULL, *cgroup_subroot = NULL;
@@ -27,3 +28,8 @@ int enter_cgroup_subroot(void) {
 
         return cg_attach_everywhere(supported, cgroup_subroot, 0, NULL, NULL);
 }
+
+/* https://docs.travis-ci.com/user/environment-variables#default-environment-variables */
+bool is_run_on_travis_ci(void) {
+        return streq_ptr(getenv("TRAVIS"), "true");
+}

src/test/test-helper.h

@@ -27,3 +27,5 @@
                )
 
 int enter_cgroup_subroot(void);
+
+bool is_run_on_travis_ci(void);

travis-ci/managers/fedora.sh

@@ -60,6 +60,7 @@ for phase in "${PHASES[@]}"; do
             travis_wait docker exec --interactive=false \
                 -e UBSAN_OPTIONS=print_stacktrace=1:print_summary=1:halt_on_error=1 \
                 -e ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1 \
+                -e "TRAVIS=$TRAVIS" \
                 -t $CONT_NAME \
                 meson test --timeout-multiplier=3 -C ./build/ --print-errorlogs
             ;;