[Unit]
Description=Atop advanced performance monitor
Documentation=man:atop(1)

[Service]
Environment=LOGOPTS="-R"
Environment=LOGINTERVAL=600
Environment=LOGGENERATIONS=28
Environment=LOGPATH=/var/log/atop
EnvironmentFile=/etc/default/atop
ExecStartPre=/bin/sh -c 'test -n "$LOGINTERVAL" -a "$LOGINTERVAL" -eq "$LOGINTERVAL"'
ExecStartPre=/bin/sh -c 'test -n "$LOGGENERATIONS" -a "$LOGGENERATIONS" -eq "$LOGGENERATIONS"'
ExecStart=/bin/sh -c 'exec /usr/bin/atop ${LOGOPTS} -w "${LOGPATH}/atop_$(date +%%Y%%m%%d)" ${LOGINTERVAL}'
ExecStartPost=/usr/bin/find "${LOGPATH}" -name "atop_*" -mtime +${LOGGENERATIONS} -exec rm -v {} \;
KillSignal=SIGUSR2

[Install]
WantedBy=multi-user.target