install-crossworks-unattended.sh

#!/bin/bash
#
# source: https://askubuntu.com/questions/1002349/install-a-program-automatically-with-terminal-which-has-menus
# dependencies: sudo imagemagick xvfb

# constants
SERVERNUM=99
SCREENSHOT=status.png
CROSSWORKS_PID=
XVFB_PID=
PROGRESS_PID=
KEYS_PID=

# function find_free_servernum() taken from xvfb-run
# Xvfb is part of x.org and licensed under MIT
# http://opensource.org/licenses/mit-license.php
#
# Find a free server number by looking at .X*-lock files in /tmp.
find_free_servernum() {
    # Sadly, the "local" keyword is not POSIX.  Leave the next line commented in
    # the hope Debian Policy eventually changes to allow it in /bin/sh scripts
    # anyway.
    #local i

    i=$SERVERNUM
    while [ -f /tmp/.X$i-lock ]; do
        i=$(($i + 1))
    done
    echo $i
}

start_xvfb() {
    SERVERNUM=$(find_free_servernum)
    echo starting virtual DISPLAY at :$SERVERNUM
    export DISPLAY=:$SERVERNUM

    Xvfb $DISPLAY -screen 0 1280x800x16 &> /dev/null &
    XVFB_PID=$!
}

install_crossworks() {
    check_root
    if [ ! -e ./install_crossworks ]; then
        echo crossworks installation file not found
        exit 1
    fi
    timeout --kill-after=90s 90s sudo -n ./install_crossworks &
    CROSSWORKS_PID=$!

    crossworks_enter_keys &
    KEYS_PID=$!

    show_progress &
    PROGRESS_PID=$!

    if wait $CROSSWORKS_PID; then
        echo ok
    fi

    kill "$PROGRESS_PID" &> /dev/null
    kill "$KEYS_PID" &> /dev/null
}

crossworks_enter_keys() {
    # wait for archive to get checked for crc errors
    sleep 5
    # press next
    xdotool key KP_Enter
    sleep 1
    # accept license
    xdotool key Tab Tab Tab space Tab Tab KP_Enter
    sleep 1
    # select install directory
    xdotool key KP_Enter
    sleep 1
    # start installation
    xdotool key KP_Enter
    sleep 60
    # exit installation
    xdotool key KP_Enter
    sleep 1
}

show_progress() {
    while /bin/true; do
        take_screenshot
        echo -n .
        sleep 1
    done
}

take_screenshot() {
    import -window root $SCREENSHOT
    sudo chown $USER $SCREENSHOT
}

check_root() {
    if ! sudo -n /bin/true 2>/dev/null; then
        echo super user is required for installation.
        sudo /bin/true
    fi
}

check_installation() {
    if [ -e /usr/share/crossworks_for_arm_4.1/bin/crossstudio ]; then
        echo Crossworks installed.
        exit 0
    fi
}

cleanup() {
    kill "$PROGRESS_PID" &> /dev/null
    kill "$CROSSWORKS_PID" &> /dev/null
    kill "$XVFB_PID" &> /dev/null
    kill "$KEYS_PID" &> /dev/null
}

trap cleanup EXIT

check_installation
start_xvfb
install_crossworks
check_installation