#! /bin/bash
#
# installkernel -- last edit 2008-09-09
#
# installkernel
# ``````````````
# this script is called by linux-kernel's 'make install' option to copy 
#  the kernel files (bzImage, System.map, .config) to the /boot directory
# the script is used for both 2.4 and 2.6 series kernel installs
#
# Copyright (C) 2004-2008 Grant Coady <grant@bugsplatter.id.au>
#
#  based on linux/arch/i386/boot/install.sh
#  GPL v2 per linux/COPYING by reference
#
# installation
# `````````````
# the linux 'make install' looks for this script in two places, 
#  in this order:
#
#	~/bin/installkernel
#	/sbin/installkernel
#
# copy installkernel to one of the above locations but don't overwrite 
#  any distribution copy of /sbin/installkernel
#
# limitations
# ````````````
# does not build initrd files -- I've never used them
#
# optional
# `````````
# if you use a backup kernel naming option in /etc/lilo.conf 
# this script will backup the old kernel files of the same version if 
#  it finds the line 'bzImage-$(uname -r).old' in /etc/lilo.conf, for 
#  example:
#
# /etc/lilo.conf
#	...
#	image = /boot/bzImage-2.6.26.5a
#		label = 2.6.26.5a
#
#	image = /boot/bzImage-2.6.26.5a.old
#		label = 2.6.26.5a.old
#	...
#
# when installing bzImage-2.6.26.5a the script will rename existing kernel 
#  files to the *.old extension, in this case: bzImage-2.6.26.5a.old, 
#  config-2.6.26.5a.old and System.map-2.6.26.5a.old
#
# home site
# ``````````
# http://bugsplatter.id.au/bash/kernel/
#
# installing kernel to alternate target
# ``````````````````````````````````````
# Usually the root user invokes the script as `make install` and expects the 
#  kernel files to appear in /boot and the kernel modules in /lib/modules.
#
# To install the kernel files to an alternate directory, specify 
#  INSTALL_PATH; for example, install kernel to staging area:
#
#    INSTALL_PATH=/staging/area/boot make install
#
# see also
# `````````
# kbuild-install and kbuild-install-local scripts from the home page above, 
#  these scripts are what I use to build kernels for some years now
#
# Changelog
# ``````````
# 2008-09-09
# rewrite the above commentary

ME=installkernel
VERSION="2007-01-17"

echo -e "\n$ME:\nGrant's installkernel script, $VERSION"
DEBUG=
[ $DEBUG ] && echo "
* Arguments:
    kernel version:       $1
    kernel image file:    $2
    kernel map file:      $3
    default install path: $4
"
BOOT_DIR="/boot" # default INSTALL_PATH, when $4 is empty

# check we have a valid kernel target directory
if [ -n "$4" ] && [ "$4" != "$BOOT_DIR" ]
then
	if [ -d $4 ]
	then
		BOOT_DIR=$4
	else
		echo -e "\n\n$ME: fatal: missing kernel target directory:"
		echo -e "\t$4"
		exit 1
	fi
fi

# where to find .config, based on kernel series
if [ -f '.config' ]
then
	echo "* 2.6 kernel"
	DOT_CONFIG=".config"
else
	echo "* 2.4 kernel"
	DOT_CONFIG="../../../.config"
fi

# create kernel file names with version --> $(uname -r)
CONFIG="$BOOT_DIR/config-$1"
KERNEL="$BOOT_DIR/bzImage-$1"
SYSMAP="$BOOT_DIR/System.map-$1"

echo "* Destination files:
    config:             $CONFIG
    kernel:             $KERNEL
    System.map:         $SYSMAP
"

# perhaps backup prior kernel files, if lilo.conf has matching .old stanza
if grep -q "bzImage-$1.old" /etc/lilo.conf
then
	echo "* Moving old kernel files to $BOOT_DIR/*.old"
	[ -f $CONFIG ] && mv $CONFIG "$CONFIG.old"
	[ -f $KERNEL ] && mv $KERNEL "$KERNEL.old"
	[ -f $SYSMAP ] && mv $SYSMAP "$SYSMAP.old"
fi

# write new kernel
echo -e "\n* Writing new kernel files to $BOOT_DIR"
cp $DOT_CONFIG $CONFIG
cat $2 > $KERNEL
cp $3 $SYSMAP

#end