Added a build.py script for compiling and packaging. Added post and pre install scripts to handle installation and upgrades in a cleaner way. Minor fixes to the init script and service unit file.

scripts/post-install.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+
+BIN_DIR=/usr/bin
+LOG_DIR=/var/log/telegraf
+SCRIPT_DIR=/usr/lib/telegraf/scripts
+LOGROTATE_DIR=/etc/logrotate.d
+
+function install_init {
+    cp -f $SCRIPT_DIR/init.sh /etc/init.d/telegraf
+    chmod +x /etc/init.d/telegraf
+}
+
+function install_systemd {
+    cp -f $SCRIPT_DIR/telegraf.service /lib/systemd/system/telegraf.service
+    systemctl enable telegraf
+}
+
+function install_update_rcd {
+    update-rc.d telegraf defaults
+}
+
+function install_chkconfig {
+    chkconfig --add telegraf
+}
+
+id telegraf &>/dev/null
+if [[ $? -ne 0 ]]; then
+    useradd --system -U -M telegraf -s /bin/false -d /etc/telegraf
+fi
+
+chown -R -L telegraf:telegraf $LOG_DIR
+
+# Remove legacy symlink, if it exists
+if [[ -L /etc/init.d/telegraf ]]; then
+    rm -f /etc/init.d/telegraf
+fi
+
+# Add defaults file, if it doesn't exist
+if [[ ! -f /etc/default/telegraf ]]; then
+    touch /etc/default/telegraf
+fi
+
+# Add .d configuration directory
+if [[ ! -d /etc/telegraf/telegraf.d ]]; then
+    mkdir -p /etc/telegraf/telegraf.d
+fi
+
+# Distribution-specific logic
+if [[ -f /etc/redhat-release ]]; then
+    # RHEL-variant logic
+    which systemctl &>/dev/null
+    if [[ $? -eq 0 ]]; then
+	install_systemd
+    else
+	# Assuming sysv
+	install_init
+	install_chkconfig
+    fi
+elif [[ -f /etc/lsb-release ]]; then
+    # Debian/Ubuntu logic
+    which systemctl &>/dev/null
+    if [[ $? -eq 0 ]]; then
+	install_systemd
+    else
+	# Assuming sysv
+	install_init
+	install_update_rcd
+    fi
+fi