Revert "Revert "test: add test case for systemd-update-utmp vs daemon-reexec""

This reverts commit 837773add465bd0a0d1f598203d297cf0129468b.

The original issue #27287 is fixed by #28123. Let's
reintroduce the test for systemd-update-utmp.

diff --git a/test/units/testsuite-01.sh b/test/units/testsuite-01.sh
index 780f37ee128116028248e1c7be3d6f00aa018772..870b62da9aba05f0f39ca5af0741518aaccb1cf0 100755 (executable)
--- a/test/units/testsuite-01.sh
+++ b/test/units/testsuite-01.sh
@@ -45,4 +45,17 @@ systemctl daemon-reload
 # of systemd-analyze blame. See issue #27187.
 systemd-analyze blame
 
+# Test for 'systemd-update-utmp runlevel' vs 'systemctl daemon-reexec'.
+# See issue #27163.
+# shellcheck disable=SC2034
+for _ in {0..10}; do
+    systemctl daemon-reexec &
+    pid_reexec=$!
+    # shellcheck disable=SC2034
+    for _ in {0..10}; do
+        SYSTEMD_LOG_LEVEL=debug /usr/lib/systemd/systemd-update-utmp runlevel
+    done
+    wait "$pid_reexec"
+done
+
 touch /testok