tests: check if zipl is using the safer syncfs() method

Related: RHEL-157238

tests/zipl-sync/main.fmf

@@ -0,0 +1,18 @@
+summary: zipl-sync
+description: |
+    Check if zipl is using syncfs() instead of potentially blocking sync()
+link: https://redhat.atlassian.net/browse/RHEL-157238
+contact: Daniel Horák <dhorak@redhat.com>
+component:
+  - s390utils
+test: ./runtest.sh
+framework: beakerlib
+require:
+  - s390utils-core
+  - strace
+duration: 5m
+enabled: true
+adjust:
+  - when: arch != s390x
+    enabled: false
+    because: This test applies only to s390x systems.

tests/zipl-sync/runtest.sh

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+#!/bin/bash
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Description: Check if zipl is using syncfs() instead of potentially
+#                blocking sync()
+#   Author: Dan Horák <dhorak@redhat.com>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright (c) 2026 Red Hat, Inc.
+#
+#   This program is free software: you can redistribute it and/or
+#   modify it under the terms of the GNU General Public License as
+#   published by the Free Software Foundation, either version 2 of
+#   the License, or (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be
+#   useful, but WITHOUT ANY WARRANTY; without even the implied
+#   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+#   PURPOSE.  See the GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program. If not, see http://www.gnu.org/licenses/.
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+# Include Beaker environment
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+PACKAGE="s390utils-core strace"
+
+log=/tmp/zipl.log
+
+rlJournalStart
+rlPhaseStartSetup
+    rlAssertRpm $PACKAGE
+rlPhaseEnd
+
+rlPhaseStartTest "Check if zipl is using syncfs() instead of potentially blocking sync()"
+    rlRun "strace -o $log zipl -V"
+    rlAssertGrep syncfs $log -w
+    rlAssertNotGrep sync $log -w
+rlPhaseEnd
+
+rlPhaseStartCleanup
+rlPhaseEnd
+
+rlJournalPrintText
+rlJournalEnd