new function: allow hostname to be set

scripts/functions.sh

@@ -254,4 +254,79 @@ read_octoprint_service_status(){
   else
     OPRINT_SERVICE_STATUS="${red}[Disable]${default} OctoPrint Service                       "
   fi
+}
+
+create_custom_hostname(){
+  echo
+  top_border
+  echo -e "|  You can change the hostname of this machine to use   |"
+  echo -e "|  that name to open the Interface in your browser.     |"
+  echo -e "|  This option is completely optional and can also be   |"
+  echo -e "|  done at a later point in time if you are unsure.     |"
+  echo -e "|                                                       |"
+  echo -e "|  Example: If you set the hostname to 'my-printer'     |"
+  echo -e "|           you can open Mainsail by browsing to:       |"
+  echo -e "|           http://my-printer.local                     |"
+  bottom_border
+  while true; do
+    echo -e "${cyan}"
+    read -p "###### Do you want to change the hostname? (Y/n): " yn
+    echo -e "${default}"
+    case "$yn" in
+      Y|y|Yes|yes|"") set_hostname; break;;
+      N|n|No|no) break;;
+    esac
+  done
+}
+
+set_hostname(){
+  #check for existing avahi installation
+  status_msg "Checking for necessary Avahi installation ..."
+  if ! [[ $(dpkg-query -f'${Status}' --show avahi-daemon 2>/dev/null) = *\ installed ]]; then
+    status_msg "Installing Avahi ..."
+    sudo apt-get install avahi-daemon -y && ok_msg "Avahi successfully installed!"
+  fi
+  ok_msg "Avahi found!"
+  #get current hostname and write to variable
+  HOSTNAME=$(hostname)
+  #create host file if missing or create backup of existing one with current date&time
+  if [ -f /etc/hosts ]; then
+    status_msg "Creating backup of hosts file ..."
+    get_date
+    sudo cp /etc/hosts /etc/hosts."$current_date".bak
+    ok_msg "Backup done!"
+    ok_msg "File:'/etc/hosts."$current_date".bak'"
+  else
+    sudo touch /etc/hosts
+  fi
+  echo
+  top_border
+  echo -e "|  ${green}Allowed characters: a-z, 0-9 and single '-'${default}          |"
+  echo -e "|  ${red}No special characters allowed!${default}                       |"
+  echo -e "|  ${red}No leading or trailing '-' allowed!${default}                  |"
+  bottom_border
+  while true; do
+    echo -e "${cyan}"
+    read -p "###### Please set the new hostname: " NEW_HOSTNAME
+    echo -e "${default}"
+    if [[ $NEW_HOSTNAME =~ ^[^\-]+([0-9a-z]\-{0,1})+[^\-]+$ ]]; then
+      ok_msg "'$NEW_HOSTNAME' is a valid hostname!"
+      #set hostname in /etc/hostname
+      status_msg "Setting hostname to '$NEW_HOSTNAME' ..."
+      status_msg "Please wait ..."
+      sudo hostnamectl set-hostname $NEW_HOSTNAME
+      #write new hostname to /etc/hosts
+      status_msg "Writing new hostname to /etc/hosts ..."
+      if cat /etc/hosts | grep "###set by kiauh" &>/dev/null; then
+        sudo sed -i "/###set by kiauh/s/\<$HOSTNAME\>/$NEW_HOSTNAME/" /etc/hosts
+      else
+        echo "127.0.0.1     $NEW_HOSTNAME ###set by kiauh" | sudo tee -a /etc/hosts &>/dev/null
+      fi
+      ok_msg "New hostname successfully configured!"
+      ok_msg "You need to reboot your machine for changes to take effect!"
+      break
+    else
+      warn_msg "'$NEW_HOSTNAME' is not a valid hostname!"
+    fi
+  done
 }