#! /bin/sh

#
#  kdump
#
#  Description:  The kdump init script provides the support necessary for
#  		 loading a kdump kernel into memory at system bootup time,
#		 and for copying away a vmcore at system panic time.
#
#  Copyright 2005 Red Hat, Inc.
#
#  chkconfig: - 20 80
#
#  Author:  Jeff Moyer <jmoyer@redhat.com>


# Source function library.
. /etc/init.d/functions

KEXEC=/sbin/kexec

# Will be different for ia64, for example.  For now, that architecture isn't
# supported.  Code needs to be added here when we do.
BOOTDIR="/boot"

KDUMP_KERNELVER=""
KDUMP_COMMANDLINE=""
KEXEC_ARGS=""
KDUMP_CONFIG_FILE="/etc/kdump.conf"

standard_kexec_args="-p --args-linux"

if [ -f /etc/sysconfig/kdump ]; then
	. /etc/sysconfig/kdump
fi

function save_core()
{
	coredir="/var/crash/`date +"%Y-%m-%d-%H:%M"`"

	mkdir -p $coredir
	cp /proc/vmcore $coredir/vmcore
}

function check_config()
{
	if [ -z "$KDUMP_KERNELVER" ]; then
		local running_kernel=`uname -r`

		kdump_kver=`echo $running_kernel | sed 's/smp//g'`
		kdump_kver="${kdump_kver}kdump"
	else
		kdump_kver=$KDUMP_KERNELVER
	fi

	kdump_kernel="${BOOTDIR}/vmlinux-${kdump_kver}"
	kdump_initrd="${BOOTDIR}/initrd-${kdump_kver}.img"

	if [ ! -f $kdump_kernel ]; then
		echo -n "No kdump kernel image found."; warning; echo
		echo -n "Tried to locate ${kdump_kernel}"
		exit 0
	fi

	if [ ! -f $kdump_initrd ]; then
		echo "No kdump initial ramdisk found."
		echo "Tried to locate ${kdump_initrd}"
		return 1
	fi

	#check to see if config file has been modified after
	#last build of the image file
	config_time=0
	if [ -f $KDUMP_CONFIG_FILE ]; then
		config_time=`stat -c "%Y" $KDUMP_CONFIG_FILE`
	fi
	kernel_time=`stat -c "%Y" $kdump_kernel`
	image_time=`stat -c "%Y" $kdump_initrd`

	if [ "$config_time" -gt "$image_time" ] ||
	   [ "$kernel_time" -gt "$image_time" ]; then
		echo "Detected $KDUMP_CONFIG_FILE or $kdump_kernel change"
		echo "Rebuilding $kdump_initrd"
		/sbin/mkdumprd -d -f $kdump_initrd $kdump_kver
	fi

	#hack until we stop making initrd for kdump during rpm install
	#allow initrd 120 seconds to be created before considering it new
	module_time=`stat -c "%Y" /lib/modules/${kdump_kver}`
	let module_time=module_time+120
	if [ ! "$image_time" -gt "$module_time" ]; then
		echo "Detected initial rpm install"
		echo "Rebuilding $kdump_initrd"
		/sbin/mkdumprd -d -f $kdump_initrd $kdump_kver
	fi
}

# Load the kdump kerel specified in /etc/sysconfig/kdump
# If none is specified, try to load a kdump kernel with the same version
# as the currently running kernel.
function load_kdump()
{
	if [ -z "$KDUMP_COMMANDLINE" ]; then
		KDUMP_COMMANDLINE=`cat /proc/cmdline`
		KDUMP_COMMANDLINE=`echo $KDUMP_COMMANDLINE | sed -e 's/crashkernel=[0-9]\+M@[0-9]\+M//g'`
		KDUMP_COMMANDLINE="${KDUMP_COMMANDLINE} irqpoll"
	fi

	$KEXEC $KEXEC_ARGS $standard_kexec_args \
		--command-line="$KDUMP_COMMANDLINE" \
		--initrd=$kdump_initrd $kdump_kernel
}

case "$1" in
  start)
	if [ -f /proc/vmcore ]; then
	    save_core
	    reboot
        else
	    #TODO check raw partition for core dump image
	    check_config
	    load_kdump
	fi
	;;
  stop)
	$KEXEC -p -u
	;;
  status)
	echo "not implemented"
	;;
  restart)
	$KEXEC -p -u
	check_config
	load_kdump
	;;
  condrestart)
	;;
  *)
	echo $"Usage: $0 {start|stop|status|restart}"
	exit 1
esac

exit $?