Automatically download the latest Discord in Arch-based distros

discord-update.sh

#!/bin/bash

# requires jq: pacman -S jq
# requries sudo, gksu, zensu etc for install. Edit the "pacman -U" line to suit your needs.
# The desktop file will attempt to run discord-update
# ln -sf /path/to/discord-update.sh /usr/bin/discord-update


# https://stackoverflow.com/a/246128/11210376
SOURCE=${BASH_SOURCE[0]}
while [ -L "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
  DIR=$( cd -P "$( dirname "$SOURCE" )" >/dev/null 2>&1 && pwd )
  SOURCE=$(readlink "$SOURCE")
  [[ $SOURCE != /* ]] && SOURCE=$DIR/$SOURCE # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
DIR=$( cd -P "$( dirname "$SOURCE" )" >/dev/null 2>&1 && pwd )

cd "$DIR"
CVER=$(awk -F "=" '/pkgver=/ {print $2}' ./PKGBUILD)
LATEST=$(curl -s https://discord.com/api/updates/stable?platform=linux | jq -r .name)

if [[ "$CVER" != "$LATEST" ]]; then 
    echo "Updating to $LATEST";
    
    rm -rf pkg src ./*.tar.gz ./*.tar.zst ./*.html

    /usr/bin/cp ./PKGBUILD.template PKGBUILD
    sed -i -e "s/%pkgver%/$LATEST/g" ./PKGBUILD
    makepkg
    mv ./*.tar.zst ./discord-realtime.tar.zst

    gksu pacman -U --noconfirm ./discord-realtime.tar.zst
fi;

/usr/bin/discord

PKGBUILD.template

pkgname=discord
_pkgname=Discord
pkgver=%pkgver%
pkgrel=1
pkgdesc="Discord, but the PKGBUILD is automatically updated. Probably a bad idea."
arch=('x86_64')
url='https://discordapp.com'
license=('custom')
depends=('libnotify' 'libxss' 'nspr' 'nss' 'gtk3')
optdepends=('libpulse: Pulseaudio support'
            'xdg-utils: Open files')
source=("https://dl.discordapp.net/apps/linux/$pkgver/$pkgname-$pkgver.tar.gz"
        'LICENSE.html::https://discordapp.com/terms'
        'OSS-LICENSES.html::https://discordapp.com/licenses')
sha512sums=('SKIP'
            'SKIP'
            'SKIP')

prepare() {
  cd $_pkgname

  sed -i "s|Exec=.*|Exec=/usr/bin/$pkgname|" $pkgname.desktop
  echo 'Path=/usr/bin' >> $pkgname.desktop
  sed -i -e "s:/usr/bin/discord:/usr/bin/discord-update:g" $pkgname.desktop
}

package() {
  # Install the app
  install -d "$pkgdir"/opt/$pkgname
  cp -a $_pkgname/. "$pkgdir"/opt/$pkgname

  chmod 755 "$pkgdir"/opt/$pkgname/$_pkgname

  rm "$pkgdir"/opt/$pkgname/postinst.sh

  install -d "$pkgdir"/usr/{bin,share/{pixmaps,applications}}
  ln -s /opt/$pkgname/$_pkgname "$pkgdir"/usr/bin/$pkgname
  ln -s /opt/$pkgname/discord.png "$pkgdir"/usr/share/pixmaps/$pkgname.png
  ln -s /opt/$pkgname/$pkgname.desktop "$pkgdir"/usr/share/applications/$pkgname.desktop

  # setuid on chrome-sandbox
  chmod u+s "$pkgdir"/opt/$pkgname/chrome-sandbox

  # Licenses
  install -Dm 644 LICENSE.html "$pkgdir"/usr/share/licenses/$pkgname/LICENSE.html
  install -Dm 644 OSS-LICENSES.html "$pkgdir"/usr/share/licenses/$pkgname/OSS-LICENSES.html
}