Add EXIT trap, ensure non-interactive upgrade

linux_mint.sh

@@ -4,6 +4,7 @@
 # Set variables
 ###
 export DEBIAN_FRONTEND=noninteractive
+DPKG_CFG_FRAGMENT=/etc/dpkg/dpkg.cfg.d/non-interactive
 
 # Color of prefix (>>>) to distinguish user and root echos
 color_prefix=32 # green
@@ -102,10 +103,18 @@ handle_signal() {
   e "Ausführung abgebrochen! Script wird beendet..."
   exit 1
 }
+
+# always executed on shell exit regardless of reason. for cleanup tasks
+handle_exit() {
+  # Remove temporary dpkg cfg if root
+  is_root && rm -f "$DPKG_CFG_FRAGMENT"
+}
+
 trap handle_signal SIGINT SIGTERM
+trap handle_exit EXIT
 
 pkg() {
-  apt install "$@" --quiet --yes
+  apt install "$@" --yes --quiet
 }
 
 ###
@@ -119,6 +128,12 @@ if is_root; then
     exit 1
   fi
 
+  # place temporary dpkg configurations to ensure non-interactive upgrade
+  cat <<'DPKG' >"$DPKG_CFG_FRAGMENT"
+force-confold
+force-confdef
+DPKG
+
   e "Automatische Installation empfohlener Pakete aktivieren ..."
   sed -i 's/false/true/g' /etc/apt/apt.conf.d/00recommends