aufs-exec

#!/bin/sh

ME=${0##*/}

  LIVE_X64_LD_PATH="/lib64:/lib:/lib/x86_64-linux-gnu:/usr/lib"
  LIVE_386_LD_PATH="/lib:/lib/i386-linux-gnu:/usr/lib"
         LIVE_PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin"

usage() {
    local ret=${1:-0}

cat <<Usage
Usage: $ME command [options]

Execute <command> from under the $dir directory, including
any libraries dependenices.
Usage
    exit $ret
}

main() {
    prep
    [ $# -lt 1 ] && usage

    local xdir found prog=$1

    [ -n "${prog##/*}" ] && prog=$(ld_path_which $prog)

    if [ -z "$prog" ]; then
        printf "Program %s not found under $LD_DIR\n" "$1"  >&2
        return 1
    fi

    shift
    LD_LIBRARY_PATH=$LD_PATH $LD_DIR$prog "$@"

}

prep() {
    case $ME in
         aufs-*) dir=/live/aufs  ;;
        linux-*) dir=/live/linux ;;
    esac

    LD_DIR=$dir

    arch=$(uname -m)

    case $arch in
          x86_64) ld_path=$LIVE_X64_LD_PATH ;;
        i[3-8]86) ld_path=$LIVE_386_LD_PATH ;;
               *) printf 'unknown architecture "%s". Assuming "%s"\n' $arch i686 >&2
                  ld_path=$LIVE_386_LD_PATH;;
    esac

    LD_PATH=$(echo $ld_path | sed -r "s=(^|:)=\\1$dir=g")
}

ld_path_which() {
    local xdir prog=$1
    for xdir in $(echo $LIVE_PATH | tr ':' ' '); do
        [ -x $LD_DIR$xdir/$prog ] || continue
        echo $xdir/$prog
        return 0
    done
    return 1
}

main "$@"