Update telegraf.service and packaging script for systemd

Deals with most of #170

package.sh

@@ -39,6 +39,7 @@ LOGROTATE_DIR=/etc/logrotate.d
 SAMPLE_CONFIGURATION=etc/config.sample.toml
 LOGROTATE_CONFIGURATION=etc/logrotate.d/telegraf
 INITD_SCRIPT=scripts/init.sh
+SYSTEMD_SCRIPT=scripts/telegraf.service
 
 TMP_WORK_DIR=`mktemp -d`
 POST_INSTALL_PATH=`mktemp`
@@ -157,16 +158,25 @@ generate_postinstall_script() {
 rm -f $INSTALL_ROOT_DIR/telegraf
 rm -f $INSTALL_ROOT_DIR/init.sh
 ln -s $INSTALL_ROOT_DIR/versions/$version/telegraf $INSTALL_ROOT_DIR/telegraf
-ln -s $INSTALL_ROOT_DIR/versions/$version/scripts/init.sh $INSTALL_ROOT_DIR/init.sh
-
-rm -f /etc/init.d/telegraf
-ln -sfn $INSTALL_ROOT_DIR/init.sh /etc/init.d/telegraf
-chmod +x /etc/init.d/telegraf
-if which update-rc.d > /dev/null 2>&1 ; then
-    update-rc.d -f telegraf remove
-    update-rc.d telegraf defaults
+
+# Systemd
+if which systemctl > /dev/null 2>&1 ; then
+    ln -s $INSTALL_ROOT_DIR/versions/$version/scripts/telegraf.service /lib/systemd/system/telegraf.service
+    systemctl enable telegraf
+# Sysv
 else
-    chkconfig --add telegraf
+    ln -s $INSTALL_ROOT_DIR/versions/$version/scripts/init.sh $INSTALL_ROOT_DIR/init.sh
+    rm -f /etc/init.d/telegraf
+    ln -sfn $INSTALL_ROOT_DIR/init.sh /etc/init.d/telegraf
+    chmod +x /etc/init.d/telegraf
+    # update-rc.d sysv service:
+    if which update-rc.d > /dev/null 2>&1 ; then
+        update-rc.d -f telegraf remove
+        update-rc.d telegraf defaults
+    # CentOS-style sysv:
+    else
+        chkconfig --add telegraf
+    fi
 fi
 
 if ! id telegraf >/dev/null 2>&1; then
@@ -213,13 +223,19 @@ done
 echo "${BINS[*]} copied to $TMP_WORK_DIR/$INSTALL_ROOT_DIR/versions/$VERSION"
 
 cp $INITD_SCRIPT $TMP_WORK_DIR/$INSTALL_ROOT_DIR/versions/$VERSION/scripts
-
 if [ $? -ne 0 ]; then
     echo "Failed to copy init.d script to packaging directory -- aborting."
     cleanup_exit 1
 fi
 echo "$INITD_SCRIPT copied to $TMP_WORK_DIR/$INSTALL_ROOT_DIR/versions/$VERSION/scripts"
 
+cp $SYSTEMD_SCRIPT $TMP_WORK_DIR/$INSTALL_ROOT_DIR/versions/$VERSION/scripts
+if [ $? -ne 0 ]; then
+    echo "Failed to copy systemd file to packaging directory -- aborting."
+    cleanup_exit 1
+fi
+echo "$SYSTEMD_SCRIPT copied to $TMP_WORK_DIR/$INSTALL_ROOT_DIR/versions/$VERSION/scripts"
+
 cp $SAMPLE_CONFIGURATION $TMP_WORK_DIR/$CONFIG_ROOT_DIR/telegraf.conf
 if [ $? -ne 0 ]; then
     echo "Failed to copy $SAMPLE_CONFIGURATION to packaging directory -- aborting."

scripts/telegraf.service

@@ -8,6 +8,8 @@ EnvironmentFile=-/etc/default/telegraf
 User=telegraf
 ExecStart=/opt/telegraf/telegraf -config /etc/opt/telegraf/telegraf.conf $TELEGRAF_OPTS
 Restart=on-failure
+KillMode=process
 
 [Install]
 WantedBy=multi-user.target
+Alias=telegraf.service