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

I was unaware of this gist and wrote my own script: https://gist.github.com/hsandt/113d3c6698a54e378d44b5024140c2a0 but I find it interesting how you download the icon and embed the .desktop template in the same file. My script requires manually placing the icon and copying the .desktop template, so it's not completely plug-and-play. In counterpart, it is able to deduce the DL URL from the version and channel passed to the script.

@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!