#! /bin/sh
# postinst script for kexec-tools
#
# see: dh_installdeb(1)

set -e

update_param() {                                                               
        eval old=\"'$'$1\"
        eval new=\"'$'new_$1\"

        if test "$old" = "$new"; then
                return
        fi

        if test -z "$old"; then
                grep -Eq "^ *$1=" "$INITCONFFILE" || echo "$1=" \
                       >> "$INITCONFFILE"
        fi

	sed -e "s/^ *$1=.*/$1=$new/" < $INITCONFFILE > $INITCONFFILE.$$
	mv -f $INITCONFFILE.$$ $INITCONFFILE
}

# summary of how this script can be called:
#        * <postinst> `configure' <most-recently-configured-version>
#        * <old-postinst> `abort-upgrade' <new version>
#        * <conflictor's-postinst> `abort-remove' `in-favour' <package>
#          <new-version>
#        * <deconfigured's-postinst> `abort-deconfigure' `in-favour'
#          <failed-install-package> <version> `removing'
#          <conflicting-package> <version>
# for details, see http://www.debian.org/doc/debian-policy/ or
# the debian-policy package
#

# Handle debconf
. /usr/share/debconf/confmodule

INITCONFFILE=/etc/default/kexec
 
# We generate several files during the postinst, and we don't want
#       them to be readable only by root.
umask 022

case "$1" in
    configure)
    ;;

    install|upgrade)
    ;;

    upgrade)
    ;;

    abort-upgrade|abort-remove|abort-deconfigure)
    exit 0	
    ;;

    *)
        echo "postinst called with unknown argument \`$1'" >&2
        exit 1
    ;;
esac

# Generate configuration file if it does not exist, using
# default values.
[ -r "${INITCONFFILE}" ] || {
	echo Generating ${INITCONFFILE}... >&2
	cat >${INITCONFFILE} <<'EOFMAGICNUMBER1234'
# Defaults for kexec-tools

# Kernel and initrd image
KERNEL_IMAGE="/vmlinuz"
INITRD="/initrd.img"

# If empty, use current /proc/cmdline
APPEND=""

# Load the default kernel from grub config (true/false)
USE_GRUB_CONFIG=false
EOFMAGICNUMBER1234
}

# Add USE_GRUB_CONFIG parameter to config file if it does not exist
. ${INITCONFFILE}
if test -z "$USE_GRUB_CONFIG" ; then
	echo "" >> ${INITCONFFILE}
	echo "# Load the default kernel from grub config (true/false)" >> ${INITCONFFILE}
	echo "USE_GRUB_CONFIG=" >> ${INITCONFFILE}
fi

# Remove discontinued LOAD_KEXEC option
if test -n "$LOAD_KEXEC" ; then
	sed -i "s/Defaults for kexec initscript/Defaults for kexec-tools/" ${INITCONFFILE}
	sed -i "/sourced by/d" ${INITCONFFILE}
	sed -i "/Load a kexec kernel/d" ${INITCONFFILE}
	sed -i "/LOAD_KEXEC/d" ${INITCONFFILE}
	sed -i '/^$/N;/^\n$/D' ${INITCONFFILE}
fi

# Detect if system is configured to place kernel link under /boot instead of /
# If yes, update kernel and initrd image locations in config file
if [ -f /etc/kernel-img.conf ]; then
	LINK_IN_BOOT=`grep link_in_boot /etc/kernel-img.conf | cut -f2 -d= | tr -d '[:blank:]'`
	if [ "$LINK_IN_BOOT" = "yes" ]; then
		sed -e "s/KERNEL_IMAGE=\"\/vmlinuz\"/KERNEL_IMAGE=\"\/boot\/vmlinuz\"/" < ${INITCONFFILE} > ${INITCONFFILE}.$$
		mv -f ${INITCONFFILE}.$$ $INITCONFFILE
		sed -e "s/INITRD=\"\/initrd.img\"/INITRD=\"\/boot\/initrd.img\"/" < ${INITCONFFILE} > ${INITCONFFILE}.$$
		mv -f ${INITCONFFILE}.$$ $INITCONFFILE
	else
		sed -e "s/KERNEL_IMAGE=\"\/boot\/vmlinuz\"/KERNEL_IMAGE=\"\/vmlinuz\"/" < ${INITCONFFILE} > ${INITCONFFILE}.$$
		mv -f ${INITCONFFILE}.$$ $INITCONFFILE
		sed -e "s/INITRD=\"\/boot\/initrd.img\"/INITRD=\"\/initrd.img\"/" < ${INITCONFFILE} > ${INITCONFFILE}.$$
		mv -f ${INITCONFFILE}.$$ $INITCONFFILE
	fi
fi

# ------------------------- Debconf questions start ---------------------

if [ -d /boot/grub ]
then
	db_get kexec-tools/use_grub_config
	new_USE_GRUB_CONFIG="${RET}"
else
	new_USE_GRUB_CONFIG="false"
	db_set kexec-tools/use_grub_config "false"
fi
update_param USE_GRUB_CONFIG
                                                                                                                              
# ------------------------- Debconf questions end ---------------------

#DEBHELPER#

exit 0