sandbox transmission

#!/bin/sh
# info: start transmission in sandbox taking .torrent files from desktop

CONF=$HOME"/.config/transmission"
TORR="$CONF/torrents"
LINK=$HOME"/Desktop/sandbox"
TEMP="/tmp/.sandbox_"$USER"_transmission_"$RANDOM
#TEMP=$HOME"/tmp/.sandbox_"$USER"_transmission_"$RANDOM

# is there any .torrent files in desktop?
if ! ls ~/Desktop/*.torrent &>/dev/null; then
	zenity --error --title "Transmission sandbox" --text "No torrent files on Desktop"
	exit 1
fi

# trap code to delete temp dirs even on unexpected exit
trap "{ rm -rf $TEMP $LINK; }" 0 1 2 3 5 15

# copy torrent files to config and create temp dir
rm -f "$TORR"/*
cp ~/Desktop/*.torrent "$TORR"/
rm -rf "$TEMP"
mkdir -p -m 0700 "$TEMP"
ln -sf "$TEMP" "$LINK"

# start sandboxed transmission
sandbox -i "$CONF" -t sandbox_net_t -w 500x600 -H "$TEMP" -X transmission-gtk

# delete temp dir and file
rm -f  "$LINK"
rm -rf "$TEMP"