#!/bin/sh

# Copyright © inria 2009-2010
# Brice Goglin <Brice.Goglin@inria.fr>
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
#    derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

MODULE_FILE=knem.ko
KVERSION=${KVERSION:-$(uname -r)}
MODULE_SRCDIR=@prefix@/lib/modules/${KVERSION}
MODULE_SRC=${MODULE_SRCDIR}/${MODULE_FILE}
MODULE_DESTDIR=${MODULE_DESTDIR:-/lib/modules/${KVERSION}/extra/${KPNAME}}
MODULE_DEST=${MODULE_DESTDIR}/${MODULE_FILE}

UDEV_FILE=10-knem.rules
UDEV_SRCDIR=@prefix@/etc
UDEV_SRC=${UDEV_SRCDIR}/${UDEV_FILE}
UDEV_DESTDIR=/etc/udev/rules.d
UDEV_DEST=${UDEV_DESTDIR}/${UDEV_FILE}

set -e

if test x$# != x0 -a x"$1" != x--uninstall; then
    echo "$0:"
    echo " Install kernel module and udev rules file to the system directories"
    echo " so that 'modprobe knem' works."
    echo " If destination files already exist and are different, they are renamed."
    echo " If DESTDIR is set in the environment, it is used as the file-system root."
    echo " If --uninstall is given, destination files are uninstalled."
    exit 0
fi

if test x"${DESTDIR}" != x; then
    echo "Using ${DESTDIR} as the file-system root"
fi

if test ! -d ${DESTDIR}@prefix@; then
    echo "Something bad happened with the install script"
    echo "Prefix @prefix@ isn't pointing to a valid directory"
    exit 1
fi

DATE=$(date +%Y%m%d.%H%M%S)

cmp_mv_old_and_install_new() {
    src="$1" ; shift
    dest="$1"; shift
    installname="$1" ; shift

    if test -f "${DESTDIR}$dest" ; then
	# if no difference, do nothing
	if cmp -s "${DESTDIR}$dest" "${DESTDIR}$src" ; then
	    echo "  File $dest is unchanged"
	    return
	fi

	# move the old file away
	echo "  Saving the old $dest into ${dest}.${DATE}..."
	mv -f "${DESTDIR}$dest" "${DESTDIR}${dest}.${DATE}"
    fi

    echo "  Installing $installname $dest..."
    cp -f "${DESTDIR}$src" "${DESTDIR}$dest"
}

cmp_mv_old_and_remove() {
    src="$1" ; shift
    dest="$1"; shift
    installname="$1" ; shift

    if test ! -f "${DESTDIR}$dest" ; then
	echo "  File $dest not found"
	return
    fi

    # if no difference, just remove
    if cmp -s "${DESTDIR}$dest" "${DESTDIR}$src" ; then
	echo "  File $dest is unchanged, removing..."
	rm -f "${DESTDIR}$dest"
	return
    fi

    # move the old file away
    echo "  Saving the old $dest into ${dest}.${DATE}..."
    mv -f "${DESTDIR}$dest" "${DESTDIR}${dest}.${DATE}"
}

if test x"$1" != "x--uninstall"; then
    # installing

    echo "Installing module..."
    if test ! -d ${DESTDIR}${MODULE_DESTDIR} ; then
	echo "  Creating ${MODULE_DESTDIR} directory..."
	mkdir -p ${DESTDIR}${MODULE_DESTDIR}
    fi
    cmp_mv_old_and_install_new "${MODULE_SRC}" "${MODULE_DEST}" "module"

    if test x"$DESTDIR" = x ; then
	echo "  Running depmod"
	/sbin/depmod -a
    else
	echo "  Not running depmod when in non-standard the file-system root"
    fi

    echo "Installing udev rules file..."
    if test ! -d ${DESTDIR}${UDEV_DESTDIR} ; then
	echo "  Creating ${UDEV_DESTDIR} directory..."
	mkdir -p ${DESTDIR}${UDEV_DESTDIR}
    fi
    cmp_mv_old_and_install_new "${UDEV_SRC}" "${UDEV_DEST}" "udev rules"

else
    # uninstalling

    echo "Uninstalling module..."
    cmp_mv_old_and_remove "${MODULE_SRC}" "${MODULE_DEST}" "module"

    echo "Uninstalling udev rules file..."
    cmp_mv_old_and_remove "${UDEV_SRC}" "${UDEV_DEST}" "udev rules"
fi
