remove duplicated code

lib/functions.sh

@@ -673,20 +673,3 @@ function flatten_array {
     IFS=" " read -r -a array <<<"$(tr ' ' '\n' <<<"${array[@]}" | sort -u | tr '\n' ' ')"
     printf '%s\n' "${array[@]}"
 }
-
-function prepare_nftables() {
-    local PREFIX="miaou:firewall"
-
-    if [[ ! -f /etc/nftables.rules.d/firewall.table ]]; then
-        echo "installing nftables ..."
-        sudo apt install -y nftables
-        sudo cp -f "$MIAOU_BASEDIR/templates/hardened/nftables.conf" /etc/
-        sudo mkdir -p /etc/nftables.rules.d
-        sudo cp -f "$MIAOU_BASEDIR/templates/hardened/firewall.table" /etc/nftables.rules.d/
-        sudo systemctl restart nftables
-        sudo systemctl enable nftables
-        echo "OK"
-    else
-        echo "nftables already installed!"
-    fi
-}

lib/install.sh

@@ -143,7 +143,8 @@ EOF
     if [[ -z "$env_container_hostname" ]]; then
         env_container_hostname=$(hostname -s)
         if env | grep -q container_hostname; then
-            local previous_container_hostname=$(env | grep container_hostname | cut -d '=' -f2)
+            local previous_container_hostname
+            previous_container_hostname=$(env | grep container_hostname | cut -d '=' -f2)
             env_container_hostname="$previous_container_hostname $env_container_hostname"
         fi