Adobe Reader IPV6 patch for AUR

#!/bin/sh

echo 'Warning: This patch depends on: acroread, sed, sudo.'
echo 'Optionally, for a GUI, it depends on gksu and notify-send.'

COMMENTING="Applying patch..."
UNCOMMENTING="Patch worked. Reversing patch..."
FIX_NOT_RUN_SUMMARY="The Adobe Reader patch did not run!"
FIX_NOT_RUN_DESC="The patch needs ROOT permission to edit your /etc/hosts file."
CMD_CMMT='sed -i "/::1/ s/^/# /" /etc/hosts'

# Check for running instance
if pidof -x "acroread" >/dev/null; then
        echo "Adobe Reader already running, skipping patch!"
        notify-send "Adobe Reader already running, skipping patch!"
        acroread "$1"
        exit 0
fi

if [[ $DISPLAY ]] && ! tty; then
        #Invocation from GUI
        notify-send "$COMMENTING"
        gksu --message "$FIX_NOT_RUN_DESC" "$CMD_CMMT";
        if [ $? -eq 0 ]; then
                notify-send --icon=dialog-error "$FIX_NOT_RUN_SUMMARY" "$FIX_NOT_RUN_DESC";
                exit 126;
        fi
else
        #Invocation from terminal
        echo "$COMMENTING"
        sudo sed -i "/::1/ s/^/# /" /etc/hosts || { echo "$FIX_NOT_RUN_DESC"; exit 126; }
fi

#Launch Adobe Reader in the background
nohup acroread "$1" &>/dev/null &disown

echo 'Waiting for Reader...'
sleep 5

if [[ $DISPLAY ]] && ! tty; then
        #Invocation from GUI
        notify-send "$UNCOMMENTING"
        sed -i "/::1/ s/# *//" /etc/hosts
else
        #Invocation from terminal
        echo "$UNCOMMENTING"
        sudo sed -i "/::1/ s/# *//" /etc/hosts
fi