post_install() {
    gtk-update-icon-cache -q -t -f /usr/share/icons/hicolor
    if [ ! -e /usr/bin/chromium ]; then
        ln -s /usr/bin/google-chrome /usr/bin/chromium
    fi
}

post_upgrade() {
    post_install
}

post_remove() {
    gtk-update-icon-cache -q -t -f /usr/share/icons/hicolor
    if [ -h /usr/bin/chromium ]; then
        rm /usr/bin/chromium
    fi
}