Improve debian packaging scripts.

application/build.gradle

@@ -160,6 +160,13 @@ buildDeb {
     user pkgName
     permissionGroup pkgName
 
+    // Copy the system unit files
+    from("${buildDir}/control/${pkgName}.service") {
+        addParentDirs = false
+        fileMode 0644
+        into "/lib/systemd/system"
+    }
+
     directory(pkgLogFolder, 0755)
     link("/etc/init.d/${pkgName}", "${pkgInstallFolder}/bin/${pkgName}.jar")
     link("${pkgInstallFolder}/bin/${pkgName}.yml", "${pkgInstallFolder}/conf/${pkgName}.yml")

application/src/main/scripts/control/deb/postinst

@@ -1,6 +1,9 @@
 #!/bin/sh
 
+set -e
+
 chown -R ${pkg.name}: ${pkg.logFolder}
 chown -R ${pkg.name}: ${pkg.installFolder}
-update-rc.d ${pkg.name} defaults
+systemctl --no-reload enable ${pkg.name}.service >/dev/null 2>&1 || :
 
+exit 0

application/src/main/scripts/control/deb/postrm

@@ -1,3 +1,7 @@
 #!/bin/sh
 
-update-rc.d -f ${pkg.name} remove
+set -e
+
+systemctl --no-reload disable --now ${pkg.name}.service > /dev/null 2>&1 || :
+
+exit 0

application/src/main/scripts/control/deb/preinst

@@ -1,5 +1,7 @@
 #!/bin/sh
 
+set -e
+
 if ! getent group ${pkg.name} >/dev/null; then
     addgroup --system ${pkg.name}
 fi
@@ -16,3 +18,5 @@ if ! getent passwd ${pkg.name} >/dev/null; then
             -gecos "Thingsboard application" \
             ${pkg.name}
 fi
+
+exit 0

application/src/main/scripts/control/deb/prerm

@@ -1,5 +1,9 @@
 #!/bin/sh
 
+set -e
+
 if [ -e /var/run/${pkg.name}/${pkg.name}.pid ]; then
     service ${pkg.name} stop
 fi
+
+exit 0