#!/bin/bash
# wrapper for mount.posixovl to conform with common mount syntax
# with this wrapper posixovl can be used in fstab

# location of the original mount.posixovl
origposixovl="/sbin/mount.posixovl"

# gather inputs
while [ $# -gt 0 ]; do
        if [[ "$1" == -* ]]; then
                # var is an input switch
                # we can only use the -o or -F switches
                if [[ "$1" == *F* ]]; then
                        optsF="-F"
                else
                        optsF=""
                fi
                if [[ "$1" == *o* ]]; then
                        shift
                        if [[ "$1" == *uid=* ]]; then
                                runas=$(getent passwd $(echo "$1" | sed -E -e 's/^.*uid=([^,]+)(,.*)?$/\1/') | cut -d: -f1)
                        fi
                        optsfuse="-- -o $1"
                else
                        optsfuse=""
                fi
                shift
        else
                # var is a main argument
                sourcedir="$1"
                shift
                if [[ "$1" != -* ]]; then
                        targetdir="$1"
                        shift
                else
                        targetdir="$sourcedir"
                fi
        fi
done

# verify inputs
if [ "$sourcedir" == "" ]; then
        echo "no source specified"
        exit 1
fi
if [ "$targetdir" == "" ]; then
        echo "no target specified"
        exit 1
fi

# build mount.posixovl command
if [[ -n "$runas" ]]; then
        su - "${runas}" -c "\"$origposixovl\" $optsF -S \"$sourcedir\" \"$targetdir\" $optsfuse"
else
        "$origposixovl" $optsF -S "$sourcedir" "$targetdir" $optsfuse
fi