Install Godot Engine and create its .desktop file

install_godot.sh

#!/bin/bash

TMP_PATH="/tmp/godot.zip"
GODOT_LINK=$1
GODOT_DEST="/usr/bin"
GODOT_PATH="/usr/bin/godot"

ICON_DIR="/usr/share/icons/hicolor/scalable/apps"
ICON_PATH="$ICON_DIR/godot.svg"
ICON_URL="https://upload.wikimedia.org/wikipedia/commons/6/6a/Godot_icon.svg"

DESKTOP_FILE_DIR="/usr/share/applications"
DESKTOP_FILEPATH="$DESKTOP_FILE_DIR/godot.desktop"

if [[ -z $GODOT_LINK ]]; then
    echo "Download link is not specified."
    exit 1
fi

echo "Downloading Godot"
wget -O $TMP_PATH $GODOT_LINK

godot_zipped_filepath=$(unzip -Z1 $TMP_PATH | grep Godot)
splitted_path=($(echo $godot_zipped_filepath | tr '/' '\n'))
godot_filename=${splitted_path[-1]}

unzip $TMP_PATH $godot_zipped_filepath -d $GODOT_DEST

echo "Delete old executable file"
rm $GODOT_PATH

echo "Rename executable file: $GODOT_DEST/$godot_filename -> $GODOT_PATH"
mv $GODOT_DEST/$godot_filename $GODOT_PATH

echo "Remove $TMP_PATH"
rm $TMP_PATH

if [[ -f $ICON_PATH ]]; then
    echo "Icon already existed. Skip downloading."
else
    echo "Create $ICON_DIR"
    mkdir -p $ICON_DIR
    wget -O $ICON_PATH $ICON_URL
fi

if [[ -f $DESKTOP_FILEPATH ]]; then
  echo "Desktop file already existed. Skip creating."
else
    echo "Create $DESKTOP_FILEPATH"
    touch $DESKTOP_FILEPATH

    echo "Allow execution permission for $DESKTOP_FILEPATH"
    chmod +x $DESKTOP_FILEPATH

    echo "Clear content of $DESKTOP_FILEPATH"
    > $DESKTOP_FILEPATH

    echo "Insert desktop file content"
    cat > $DESKTOP_FILEPATH <<CONTENT
    [Desktop Entry]
    Version=1.0
    Name=Godot Engine
    Comment=Godot is a 2D and 3D, cross-platform, free and open-source game engine which can create games targeting the PC, mobile and web platforms.
    Exec=$GODOT_PATH
    Icon=$ICON_PATH
    Terminal=false
    Type=Application
    Categories=Development;

    Actions=NewWindow;

    [Desktop Action NewWindow]
    Name=New Window
    Exec=$GODOT_PATH
    CONTENT

    echo "Update desktop database with $DESKTOP_FILE_DIR directory"
    update-desktop-database $DESKTOP_FILE_DIR
fi

@hsandt Yeah, my script is not flexible enough that it requires user to manually finds the download link and passes it to the script. The version/channel specification part in your script is very interesting, I could learn from that. Thank you!