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diff -up chrony-3.1/examples/chronyd.service.service-helper chrony-3.1/examples/chronyd.service
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--- chrony-3.1/examples/chronyd.service.service-helper	2017-01-31 12:12:01.863772826 +0100
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+++ chrony-3.1/examples/chronyd.service	2017-01-31 12:12:30.371860064 +0100
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@@ -10,6 +10,7 @@ Type=forking
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 PIDFile=/var/run/chrony/chronyd.pid
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 EnvironmentFile=-/etc/sysconfig/chronyd
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 ExecStart=/usr/sbin/chronyd $OPTIONS
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+ExecStartPost=/usr/libexec/chrony-helper update-daemon
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 PrivateTmp=yes
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 ProtectHome=yes
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 ProtectSystem=full