nologin: extend the /run/nologin descriptions a bit (#8244)

This is an attempt to improve #8228 a bit, by extending the /run/nologin
a bit, but still keeping it somewhat brief.

On purpose I used the vague wording "unprivileged user" rather than
"non-root user" so that pam_nologin can be updated to disable its
behaviour for members of the "wheel" group one day, and our messages
would still make sense.

See #8228.

1 files changed, 3 insertions, 6 deletions

diff --git a/src/user-sessions/user-sessions.c b/src/user-sessions/user-sessions.c
index 5e02ede402..8e8d43e1d4 100644
--- a/src/user-sessions/user-sessions.c
+++ b/src/user-sessions/user-sessions.c
@@ -51,12 +51,9 @@ int main(int argc, char*argv[]) {
                 if (k < 0 && r >= 0)
                         r = k;
 
-        } else if (streq(argv[1], "stop")) {
-                r = write_string_file_atomic_label("/run/nologin", "System is going down.");
-                if (r < 0)
-                        log_error_errno(r, "Failed to create /run/nologin: %m");
-
-        } else {
+        } else if (streq(argv[1], "stop"))
+                r = create_shutdown_run_nologin_or_warn();
+        else {
                 log_error("Unknown verb '%s'.", argv[1]);
                 r = -EINVAL;
         }