#!/sbin/runscript
# Copyright 1999-2011 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: $

description="Read files in advance during boot"

# ureadahead doesn't act like others daemons:
# it must run in background only with SSD or when it traces the system.
# On HDD il will run in foreground.
# When tracing, it must be stopped a the end of the boot,
# either by passing --timeout or by sending INT or TERM signal.
# So it is not OK to launch it with start-stop-deamon since it
# termination will be interpreted as a crash.

: ${ureadahead_binary:=/sbin/ureadahead}
: ${tracing_timeout:=60}

depend() {
	if is_early ; then
		# when tracing, debugfs is used
		need sysfs
		before '*'
	else
                need localmount
                # this should start as early as possible
                # we can't do 'before *' as that breaks it
                before bootmisc consolefont keymaps rmnologin serial urandom
	fi
}

is_early() {
	# short check to see if we have the needed partitions for early start
	[ "${SVCNAME#*.}" = "early"  ] && \
		[ -e ${ureadahead_binary} ] && [ -e /var/lib/ureadahead ]
}

force_tracing() {
	get_bootparam "force-tracing"
}

start() {
	local myopts="--timeout=${tracing_timeout}"

	### Read root pack / Start tracing ###
	# don't run ureadahead twice on /
	if ! service_started ureadahead.early ; then

		if force_tracing ; then
			ewarn "Force boot tracing as requested in kernel cmdline"
			myopts="$myopts --force-trace"
		fi
		ebegin "Starting ${SVCNAME}"
		${ureadahead_binary} --daemon --quiet ${myopts}
		eend $?
	fi
	is_early || force_tracing && return 0;

	### Read mountpoint packs ###
	# ureadahead doesn't start when outdated pack is given as argument
	# so following should never occur when tracing is caused by outdated
	# packs
	packs=$(ls /var/lib/ureadahead/*.pack 2>/dev/null)
	if [ -n "$packs" ] ; then
		einfo "Starting ${SVCNAME} for other mountpoints:"
		for p in $packs ; do
			eindent
			ebegin "${p##*/}"
			${ureadahead_binary} --daemon --quiet $p
			eend $?
			eoutdent
		done
	fi
}