Latest VSCodium installation/upgrade from .deb for local user

vscodium-install.sh

#!/usr/bin/env bash

GITHUB_USER="VSCodium"
GITHUB_REPO="vscodium"
DL_DIR=$HOME/.cache/vscodium

verify_checksum(){
  if [ $(sha256sum ${DL_DIR}/codium.deb | cut -d" " -f1) == ${file_sha256sum} ]; then
    echo "Checksum is valid."
    return 0
  else
    echo "Checksum is invalid."
    return 1
  fi
}

download_file(){
  echo "Downloading ..."
  curl --silent --location --output ${DL_DIR}/codium.deb https://github.com/${GITHUB_USER}/${GITHUB_REPO}/releases/download/${version}/${filename}
  if verify_checksum; then
    return 0
  else
    echo "Can't download valid file."
    return 1
  fi
}

version=$(basename $(curl --silent --location --output /dev/null --write-out %{url_effective} https://github.com/${GITHUB_USER}/${GITHUB_REPO}/releases/latest))
filename="codium_${version}_amd64.deb"

echo "Downloading ${filename} checksum ..."
file_sha256sum=$(curl --silent --location --output - https://github.com/${GITHUB_USER}/${GITHUB_REPO}/releases/download/${version}/${filename}.sha256 | cut -d" " -f1)
mkdir -p ${DL_DIR}/extracted
if ! [ -f ${DL_DIR}/codium.deb ]; then
  echo "File does not exist."
  if download_file; then
    echo "Extracting ..."
  else
    echo "Exiting ..."
    exit 1
  fi
else
  echo "File exists."
  if verify_checksum; then
    echo "Extracting ..."
  else
    if download_file; then
      echo "Extracting ..."
    else
      echo "Exiting ..."
      exit 1
    fi
  fi
fi

ar x --output=${DL_DIR}/extracted ${DL_DIR}/codium.deb
tar --extract --file ${DL_DIR}/extracted/data.tar.xz --directory ${DL_DIR}/extracted

echo "Installing application data ..."
mkdir -p ${HOME}/.local/share/{applications,pixmaps}
rm -rf ${HOME}/.local/share/codium
mv ${DL_DIR}/extracted/usr/share/codium ${HOME}/.local/share/
ln -sf ../share/codium/codium ${HOME}/.local/bin/codium
mkdir -p ${HOME}/.local/share/pixmaps
mv ${DL_DIR}/extracted/usr/share/pixmaps/vscodium.png ${HOME}/.local/share/pixmaps/

echo "Patching and installing desktop files ..."
sed -i 's;Exec=/usr/share/codium/codium;Exec=codium --ozone-platform-hint=auto --no-sandbox;g' ${DL_DIR}/extracted/usr/share/applications/*.desktop
mv ${DL_DIR}/extracted/usr/share/applications/*.desktop ${HOME}/.local/share/applications/

Download and install simultaneously:

curl -sSL https://gist.github.com/ar-lex/8dd947f4968f15d758d13a3854af171b/raw/vscodium-install.sh | sh