test-execute: block /sys not /proc

As explained in the previous commit, blocking /proc can cause us
to go into a long loop or fail the test.

src/test/test-execute.c

@@ -327,7 +327,7 @@ static void test_exec_inaccessiblepaths(Manager *m) {
                 return;
         }
 
-        test(m, "exec-inaccessiblepaths-proc.service", can_unshare ? 0 : EXIT_FAILURE, CLD_EXITED);
+        test(m, "exec-inaccessiblepaths-sys.service", can_unshare ? 0 : EXIT_FAILURE, CLD_EXITED);
 
         if (path_is_read_only_fs("/") > 0) {
                 log_notice("Root directory is readonly, skipping remaining tests in %s", __func__);

test/meson.build

@@ -67,7 +67,7 @@ test_data_files = '''
         test-execute/exec-ignoresigpipe-no.service
         test-execute/exec-ignoresigpipe-yes.service
         test-execute/exec-inaccessiblepaths-mount-propagation.service
-        test-execute/exec-inaccessiblepaths-proc.service
+        test-execute/exec-inaccessiblepaths-sys.service
         test-execute/exec-ioschedulingclass-best-effort.service
         test-execute/exec-ioschedulingclass-idle.service
         test-execute/exec-ioschedulingclass-none.service

test/test-execute/exec-inaccessiblepaths-sys.service

@@ -2,6 +2,6 @@
 Description=Test to make sure that mount namespace setup works properly with the 'InaccessiblePaths=/proc' option
 
 [Service]
-InaccessiblePaths=/proc
-ExecStart=/bin/sh -x -c 'test "$$(stat -c %%a /proc)" = "0"'
+InaccessiblePaths=/sys
+ExecStart=/bin/sh -x -c 'test "$$(stat -c %%a /sys)" = "0"'
 Type=oneshot