discord-deb-update.sh

#!/bin/bash
# Script to download and then install latest .deb Discord client.
# Created 2024-01-29 by Dayne Broderson
#
# Script Overview
# 1. Sends a request to the Discord URL to get the headers and extract the 
#    location header, which contains the final download URL.
# 2. It extracts the desired filename from the final download URL and cleans 
#    up any trailing whitespace or carriage return characters.
# 3. It checks if the file with the extracted filename already exists in the 
#    current directory. If it exists, it skips the download.
# 4. If the file doesn't exist, it proceeds to download the file using curl 
#    and checks the exit code to determine if the download was successful 
#    or not.
# 5. Finally it prompts user if they want to do the sudo dpkg -i install of the download.
# 
# Recommended install dance:
# cd .local/bin # or $HOME/bin # or put in /usr/local/bin
# curl -O https://gist.githubusercontent.com/dayne/40c45988e7ecfd9b74b954e711470b9c/raw/discord-deb-update.sh
# chmod +x discord-deb-update.sh

function dx-discord-deb-update() {
  echo "starting dx-discord-deb-update()"
  DOWNDIR=/tmp

  cd $DOWNDIR

  url='https://discord.com/api/download/stable?platform=linux&format=deb'
  location=$(curl -sI -L "$url"| grep location)
  if [ $? -eq 0 ]; then
    echo $location
  else
    echo "ERROR: unable to get location of latest discord .deb file"
    exit 1
  fi

  filename=$(echo "$location" | awk -F'/' '{print $NF}' | tr -d '\r' )
  if [ -f $filename ]; then
    echo "File exists: $filename"
    echo "Skipping download"
  else
    echo "Downloading $filename"
    curl -JL -o $filename $url
    if [ $? -eq 0 ]; then
      echo "SUCCESS: Download of $filename complete"
      echo "File downloadedto: /tmp/$filename"
    else
      echo "ERROR: Download of $filename failed."
      exist 1
    fi
  fi

  # ensure interactive shell is happening
  if [ ! -t 0 ]; then
    echo "file downloaded - non interactive shell detected - exiting"
    exit
  fi

  while true; do
      read -p "Do you want to run install using dpkg? (Y/N): " answer
      case $answer in
          [Yy]|[Yy][Ee][Ss])
              # Run your command here
              echo "Installing $filename"
        sudo dpkg -i $DOWNDIR/$filename
        if [ $? -eq 0 ]; then
          echo "install successful"
          exit 0
        else
          echo "install failed: try yourself with:"
          echo "sudo dpkg -i $DOWNDIR/$filename"
          exit 1
        fi
              break
              ;;
          [Nn]|[Nn][Oo])
              echo "Exiting..."
              exit 0
              ;;
          *)
              echo "Invalid input. Please enter Y, N, yes, or no."
              ;;
      esac
  done
}

function _dx-discord_check_for_update() {
    local version=$(dpkg-query -W -f='${Version}' "discord" 2>/dev/null)
    local installed_version="discord-$version.deb"
    local url='https://discord.com/api/download/stable?platform=linux&format=deb'
    local location=$(curl -sI -L "$url"| grep location)
    latest_url=$(curl -sI -L 'https://discord.com/api/download/stable?platform=linux&format=deb' | grep location | awk '{print $2}')
    if [ $? -eq 0 ]; then
      latest_version="$(basename "$latest_url" | sed 's/[[:space:]]*$//')"
      if [ "${latest_version}" == "" ]; then
        echo "error: latest_version empty."
        exit 1
      fi
    else
      echo "error: curl for latest_version failed to $latest_url"
      exit 1
    fi
    echo "installed_version=[${installed_version}]"
    echo "latest_version=[${latest_version}]"
    if [ "${installed_version}" == "${latest_version}" ]; then
      echo "we are updated -- no discord update needed"
      echo "$installed_version == $latest_version"
    else
      echo "update for discord available"
      echo "'${installed_version}' != '${filename}' ...."
      dx-discord-deb-update 
    fi
}

if [[ "${BASH_SOURCE[0]}" != "${0}" ]]; then
  # The script is being sourced. Check to see if update is needed.
  echo "source logic"
else
  echo "execute logic"
fi

_dx-discord_check_for_update