test: loosen certain sandbox restrictions when collecting coverage

With `ProtectSystem=strict` gcov is unable to write the *.gcda files
with collected coverage. Let's add a yet another switch to make such
restriction less strict to make gcov happy.

This addresses following errors:
```
...
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/binfmt-util.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/base-filesystem.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/barrier.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/ask-password-api.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/apparmor-util.c.gcda:Cannot open
systemd-networkd[272469]: profiling:/systemd-meson-build/src/shared/libsystemd-shared-249.a.p/acpi-fpdt.c.gcda:Cannot open
...
```

diff --git a/test/test-network/systemd-networkd-tests.py b/test/test-network/systemd-networkd-tests.py
index 4a358edcd271f92656e628e05fa4531ddf19140b..aa81017072422ad7e52ebf912b193ea8f2eed23e 100755 (executable)
--- a/test/test-network/systemd-networkd-tests.py
+++ b/test/test-network/systemd-networkd-tests.py
@@ -43,6 +43,7 @@ env = {}
 asan_options=None
 lsan_options=None
 ubsan_options=None
+with_coverage=False
 
 running_units = []
 
@@ -305,6 +306,8 @@ def setUpModule():
         drop_in += ['SystemCallFilter=']
     if use_valgrind or asan_options or lsan_options or ubsan_options:
         drop_in += ['MemoryDenyWriteExecute=no']
+    if with_coverage:
+        drop_in += ['ProtectSystem=no']
 
     os.makedirs('/run/systemd/system/systemd-networkd.service.d', exist_ok=True)
     with open('/run/systemd/system/systemd-networkd.service.d/00-override.conf', mode='w') as f:
@@ -331,6 +334,8 @@ def setUpModule():
         drop_in += ['SystemCallFilter=']
     if use_valgrind or asan_options or lsan_options or ubsan_options:
         drop_in += ['MemoryDenyWriteExecute=no']
+    if with_coverage:
+        drop_in += ['ProtectSystem=no']
 
     os.makedirs('/run/systemd/system/systemd-resolved.service.d', exist_ok=True)
     with open('/run/systemd/system/systemd-resolved.service.d/00-override.conf', mode='w') as f:
@@ -5037,6 +5042,7 @@ if __name__ == '__main__':
     parser.add_argument('--asan-options', help='ASAN options', dest='asan_options')
     parser.add_argument('--lsan-options', help='LSAN options', dest='lsan_options')
     parser.add_argument('--ubsan-options', help='UBSAN options', dest='ubsan_options')
+    parser.add_argument('--with-coverage', help='Loosen certain sandbox restrictions to make gcov happy', dest='with_coverage', type=bool, nargs='?', const=True, default=with_coverage)
     ns, args = parser.parse_known_args(namespace=unittest)
 
     if ns.build_dir:
@@ -5070,6 +5076,7 @@ if __name__ == '__main__':
     asan_options = ns.asan_options
     lsan_options = ns.lsan_options
     ubsan_options = ns.ubsan_options
+    with_coverage = ns.with_coverage
 
     if use_valgrind:
         networkctl_cmd = ['valgrind', '--track-origins=yes', '--leak-check=full', '--show-leak-kinds=all', networkctl_bin]