Post-install script for the deb package added

* Ownership of the system files changed to 'root:root'
* Bash variables enquoted to make them more secure

package.sh

@@ -9,10 +9,14 @@ debian_package(){
     cd "$(dirname "$0")"
     VERSION=$(git tag --sort version:refname | tail -n 1)
     [ -z "$VERSION" ] && ERRO "Can't get git tag, VERSION are empty!"
-    DEB_NAME=ananicy-${VERSION}_any
-    mkdir -p "$DEB_NAME"
-    make install PREFIX="$DEB_NAME"/
-    mkdir -p "$DEB_NAME"/DEBIAN/
+    DEB_NAME="ananicy-${VERSION}_any"
+    
+    # cleanup after previous installation
+    rm "./${DEB_NAME}.deb" && rm -rf "${DEB_NAME}"
+    
+    mkdir -p "${DEB_NAME}"
+    make install PREFIX="${DEB_NAME}"
+    mkdir -p "${DEB_NAME}/DEBIAN/"
     {
         echo "Package: ananicy"
         echo "Version: $VERSION"
@@ -24,8 +28,17 @@ debian_package(){
         echo "Installed-Size: 16"
         echo "Maintainer: nefelim4ag@gmail.com"
         echo "Description: Ananicy (ANother Auto NICe daemon) — is a shell daemon created to manage processes' IO and CPU priorities, with community-driven set of rules for popular applications (anyone may add his own rule via github's pull request mechanism)."
-    } > "$DEB_NAME"/DEBIAN/control
-    dpkg-deb --build "$DEB_NAME"
+    } > "${DEB_NAME}/DEBIAN/control"
+
+    POSTINST="${DEB_NAME}/DEBIAN/postinst"
+    touch "${POSTINST}" && chmod +x "${POSTINST}"
+    {
+        echo "#!/bin/sh"
+        echo "chown -R root:root /etc/ananicy.d"
+        echo "chown root:root /lib/systemd/system/ananicy.service"
+        echo "chown root:root /usr/bin/ananicy"
+    } > "${POSTINST}"
+    dpkg-deb --build "${DEB_NAME}"
 }
 
 archlinux_package(){