Revert "unit: add ordering dep relative to credentials dir"

Causes a cycle at shutdown, undo the backport.

Jul 10 22:13:21 H systemd[1]: poweroff.target: Trying to enqueue job poweroff.target/start/replace-irreversibly
Jul 10 22:13:21 H systemd[1]: local-fs-pre.target: Found ordering cycle on run-credentials-systemd\x2dtmpfiles\x2dsetup\x2ddev.service.mount/stop
Jul 10 22:13:21 H systemd[1]: local-fs-pre.target: Found dependency on systemd-tmpfiles-setup-dev.service/stop
Jul 10 22:13:21 H systemd[1]: local-fs-pre.target: Found dependency on local-fs-pre.target/stop
Jul 10 22:13:21 H systemd[1]: local-fs-pre.target: Job run-credentials-systemd\x2dtmpfiles\x2dsetup\x2ddev.service.mount/stop deleted to break ordering cycle starting with local-fs-pre.target/stop
Jul 10 22:13:21 H systemd[1]: systemd-sysusers.service: Found ordering cycle on systemd-tmpfiles-setup-dev.service/stop
Jul 10 22:13:21 H systemd[1]: systemd-sysusers.service: Found dependency on local-fs-pre.target/stop
Jul 10 22:13:21 H systemd[1]: systemd-sysusers.service: Found dependency on run-credentials-systemd\x2dsysusers.service.mount/stop
Jul 10 22:13:21 H systemd[1]: systemd-sysusers.service: Found dependency on systemd-sysusers.service/stop
Jul 10 22:13:21 H systemd[1]: systemd-sysusers.service: Job systemd-tmpfiles-setup-dev.service/stop deleted to break ordering cycle starting with systemd-sysusers.service/stop

This reverts commit ad10ffe.

src/core/execute.c

@@ -1458,7 +1458,7 @@ static bool context_has_no_new_privileges(const ExecContext *c) {
                 context_has_syscall_logs(c);
 }
 
-bool exec_context_has_credentials(const ExecContext *context) {
+static bool exec_context_has_credentials(const ExecContext *context) {
 
         assert(context);
 

src/core/execute.h

@@ -465,7 +465,6 @@ const char* exec_context_fdname(const ExecContext *c, int fd_index);
 
 bool exec_context_may_touch_console(const ExecContext *c);
 bool exec_context_maintains_privileges(const ExecContext *c);
-bool exec_context_has_credentials(const ExecContext *context);
 
 int exec_context_get_effective_ioprio(const ExecContext *c);
 bool exec_context_get_effective_mount_apivfs(const ExecContext *c);

src/core/unit.c

@@ -1347,26 +1347,6 @@ int unit_add_exec_dependencies(Unit *u, ExecContext *c) {
         if (r < 0)
                 return r;
 
-        if (exec_context_has_credentials(c) && u->manager->prefix[EXEC_DIRECTORY_RUNTIME]) {
-                _cleanup_free_ char *p = NULL, *m = NULL;
-
-                /* Let's make sure the credentials directory of this service is unmounted *after* the service
-                 * itself shuts down. This only matters if mount namespacing is not used for the service, and
-                 * hence the credentials mount appears on the host. */
-
-                p = path_join(u->manager->prefix[EXEC_DIRECTORY_RUNTIME], "credentials", u->id);
-                if (!p)
-                        return -ENOMEM;
-
-                r = unit_name_from_path(p, ".mount", &m);
-                if (r < 0)
-                        return r;
-
-                r = unit_add_dependency_by_name(u, UNIT_AFTER, m, /* add_reference= */ true, UNIT_DEPENDENCY_FILE);
-                if (r < 0)
-                        return r;
-        }
-
         return 0;
 }