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+[Unit]
+Description=Wait for chrony to synchronize system clock
+Documentation=man:chronyc(1)
+After=chronyd.service
+Requires=chronyd.service
+Before=time-sync.target
+Wants=time-sync.target
+
+[Service]
+Type=oneshot
+# Wait for chronyd to update the clock and the remaining
+# correction to be less than 0.1 seconds
+ExecStart=/usr/bin/chronyc -h 127.0.0.1,::1 waitsync 0 0.1 0.0 1
+# Wait for at most 3 minutes
+TimeoutStartSec=180
+RemainAfterExit=yes
+StandardOutput=null
+
+[Install]
+WantedBy=multi-user.target