#!/bin/sh

usage() {
    echo "usage: nureadahead-init [FILE [TIMEOUT [INIT [ARGS...]]]]" >&2
}

case "$1" in
    -*) usage; exit 1
esac

case "$#" in
    0) file=/.nureadahead            timeout=120 init=init;;
    1) file=$1                       timeout=120 init=init; shift 1;;
    2) file=$1                       timeout=$2  init=init; shift 2;;
    *) file=$1                       timeout=$2  init=$3;   shift 3;;
esac

export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
device=$(awk '$2 == "/" { d=$1 } END { print d }' < /proc/self/mounts)
if [ -n "$device" ]; then
    if [ -e "$file" ]; then
        nureadahead-preload "$device" < "$file" &
    else
        echo "nureadahead-init: no file, skipping preload" >&2
    fi
    nureadahead-collect "$device" "$timeout" > "$file" &
else
    echo "nureadahead-init: cannot find root device, skipping preload + collect" >&2
fi
exec "$init" "$@"