#!/usr/bin/env bash
# bwrap wrapper to correct nautilus 3.26.4+ bug for external thumbnailers under debian based distros
#  * add --ro-bind needed by imagemagick tools
#  * replaces --symlink calls with equivalent --ro-bind calls

# intialise parameters array
ARR_PARAM=( )

# add read only access to /usr/local, /var/lib, /var/cache and /etc
[ -d "/usr/local" ] && ARR_PARAM=( "${ARR_PARAM[@]}" "--ro-bind" "/usr/local" "/usr/local" )
[ -d "/var/lib" ] && ARR_PARAM=( "${ARR_PARAM[@]}" "--ro-bind" "/var/lib" "/var/lib" )
[ -d "/var/cache" ] && ARR_PARAM=( "${ARR_PARAM[@]}" "--ro-bind" "/var/cache" "/var/cache" )
[ -d "/etc" ] && ARR_PARAM=( "${ARR_PARAM[@]}" "--ro-bind" "/etc" "/etc" )

# if exists, enable $TMPDIR
[ -n "${TMPDIR}" ] && [ -d "${TMPDIR}" ] && ARR_PARAM=( "${ARR_PARAM[@]}" "--bind" "${TMPDIR}" "${TMPDIR}" )

# loop thru original parameters
while test $# -gt 0
do
	case "$1" in
		# --symlink : convert to --ro-bind
		"--symlink") shift; shift; ARR_PARAM=( "${ARR_PARAM[@]}" "--ro-bind" "$1" "$1" ); shift; ;;
		# others : add parameter
		*) ARR_PARAM=( "${ARR_PARAM[@]}" "$1" ); shift; ;;
	esac
done

# call original bwrap
/usr/bin/bwrap "${ARR_PARAM[@]}"