Use dh_systemd to configure systemd unit installation.

distribution/debian/control

@@ -5,6 +5,8 @@ Source: sonarr
 Homepage: https://sonarr.tv
 Vcs-Git: git@github.com:Sonarr/Sonarr.git
 Vcs-Browser: https://github.com/Sonarr/Sonarr
+Build-Depends:  debhelper (>= 9),
+                dh-systemd (>= 1.5)
 
 Package: sonarr
 Architecture: all

distribution/debian/install

@@ -1,2 +1 @@
 sonarr_bin/* /opt/sonarr
-debian/sonarr.service /lib/systemd/system

distribution/debian/postinst

@@ -1,7 +1,9 @@
+#!/bin/sh
+set -e
+
 USER="sonarr"
 
 # Add User
-
 if ! getent passwd "$USER" >/dev/null; then
   adduser --quiet --system --shell /bin/bash --home /var/opt/sonarr --group "$USER"
 
@@ -12,22 +14,12 @@ if ! getent passwd "$USER" >/dev/null; then
 fi
 
 # Create home directory
-
 if [ ! -d /var/opt/sonarr ]; then
   mkdir -p /var/opt/sonarr
-  chown $USER:$USER /var/opt/sonarr
+  chown -R $USER: /var/opt/sonarr
 fi
 
 # Set permissions on /opt/sonarr
+chown -R $USER: /opt/sonarr
 
-chown -R $USER:$USER /opt/sonarr
-
-# Start Sonarr automatically
-
-if [ -f /proc/1/comm ]; then
-  if [ "`cat /proc/1/comm`" = "systemd" ]; then
-    # Enable and start systemd service
-    systemctl enable sonarr.service
-    systemctl start sonarr.service
-  fi
-fi
+#DEBHELPER#

distribution/debian/postrm

@@ -1,9 +0,0 @@
-#!/bin/sh
-set -e
-
-# In case this system is running systemd, we make systemd reload the unit files
-# to pick up changes.
-if [ -d /run/systemd/system ] ; then
-	systemctl --system daemon-reload >/dev/null || true
-fi
-# End automatically added section

distribution/debian/prerm

@@ -1,6 +0,0 @@
-#!/bin/sh
-if [ -f /proc/1/comm ] && [ "`cat /proc/1/comm`" = "systemd" ]; then
-  rm -f /etc/init.d/sonarr
-  systemctl stop sonarr.service
-  systemctl disable sonarr.service
-fi

distribution/debian/rules

@@ -10,4 +10,8 @@
 #export DH_VERBOSE=1
 
 %:
-	dh $@ 
+	dh $@ --with=systemd
+
+# No init script, only systemd
+override_dh_installinit:
+	true