ybin/yabootconfig - yaboot - Rivoreo Source Code Repositories

 #! /bin/sh

 ###############################################################################
 ##
 ## yabootconfig generates a simple /etc/yaboot.conf
 ## Copyright (C) 2001, 2002, 2003 Ethan Benson
 ##
 ## This program is free software; you can redistribute it and/or
 ## modify it under the terms of the GNU General Public License
 ## as published by the Free Software Foundation; either version 2
 ## of the License, or (at your option) any later version.
 ##
 ## This program is distributed in the hope that it will be useful,
 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ## GNU General Public License for more details.
 ##
 ## You should have received a copy of the GNU General Public License
 ## along with this program; if not, write to the Free Software
 ## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 ##
 ###############################################################################

 PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin"
 ## allow to run out of /target in boot-floppies
 if [ -n "$PATH_PREFIX" ] ; then
     PATH="${PATH}:${PATH_PREFIX}/sbin:${PATH_PREFIX}/bin:${PATH_PREFIX}/usr/sbin:${PATH_PREFIX}/usr/bin:${PATH_PREFIX}/usr/local/sbin:${PATH_PREFIX}/usr/local/bin"
 fi
 PRG="${0##*/}"
 VERSION=1.0.8
 CHROOT=/
 ## $CONFIG is relative to $CHROOT
 CONFIG=etc/yaboot.conf
 NOINSTALL=0
 QUIET=0
 DEBUG=0
 SIGINT="$PRG: Interrupt caught ... exiting"
 export LC_COLLATE=C

 ## avoid older versions of ofpath shipped in debian boot-floppies etc.
 if [ -x "${PATH_PREFIX}/usr/sbin/ofpath" ] ; then
     OFPATH="${PATH_PREFIX}/usr/sbin/ofpath"
 else
     OFPATH=ofpath
 fi

 ## catch signals, clean up temporary file
 trap "cleanup" 0
 trap "exit 129" 1
 trap "echo 1>&2 $SIGINT ; exit 130" 2
 trap "exit 131" 3
 trap "exit 143" 15

 ## check for printf, use it if possible otherwise fall back on
 ## unreliable echo -e -n ("SUS" says echo shall support no switches)
 if [ "$(printf printf_test 2>/dev/null)" = printf_test ] ; then
     PRINTF=printf
 else
     PRINTF="echo -e -n"
 fi

 ## make sure echo is not lame if we must use it.
 if [ "$PRINTF" != printf ] ; then
     if [ "$(echo -e -n echo_test)" != "echo_test" ] ; then
 	echo 1>&2 "$PRG: printf unavailable and echo is broken, sorry."
 	exit 1
     fi
 fi

 ## make fake `id' if its missing, outputs 0 since if its missing we
 ## are probably running on boot floppies and thus are root.
 if (command -v id > /dev/null 2>&1) ; then
     true
 else
     id()
     {
     echo 0
     }
 fi

 ## --version output
 version()
 {
 echo \
 "$PRG $VERSION
 Written by Ethan Benson

 Copyright (C) 2001, 2002, 2003 Ethan Benson
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
 }

 ## --help output.
 usage()
 {
 echo \
 "Usage: $PRG [OPTION]...
 Generate a working /etc/yaboot.conf.

   -t, --chroot               set root directory $PRG should work from
   -r, --root                 set root partition, Example: /dev/hda3
 			       default: determined from {chroot}/etc/fstab
   -b, --boot                 set bootstrap partition, Example: /dev/hda2
 			       default: first type: Apple_Bootstrap partition
       --kernel-args          add an append= line with specified arguments
   -q, --quiet                don't ask any questions/confirmation
       --noinstall            don't automatically run mkofboot
   -h, --help                 display this help and exit
   -V, --version              output version information and exit"
 }

 debug()
 {
     [ "$DEBUG" = 0 ] && return 0
     $PRINTF 1>&2 "$PRG: DEBUG: $1"
 }

 confirm()
 {
     $PRINTF \
 "yaboot is the Linux Loader for PowerPC.  $PRG sets up your system to boot directly
 from your hard disk, without the need for a boot CD, floppy or a network boot.\n"
 [ "$NOINSTALL" = 0 ] && $PRINTF "Install yaboot bootstrap on $BOOT to boot Linux from $ROOT? [Yes] "
 [ "$NOINSTALL" = 1 ] && $PRINTF "Create simple ${CHROOT}${CONFIG} to boot Linux from $ROOT? [Yes] "
     read ans
     case "$ans" in
 	Y|y|Yes|yes|YES|"")
 	echo "Creating a simple ${CHROOT}${CONFIG}..."
 	return 0
 	;;
 	*)
 	if [ "$NOINSTALL" = 0 ] ; then
 	    $PRINTF "Create simple ${CHROOT}${CONFIG} without installing the bootstrap? [Yes] "
 	    read ans
 	    case "$ans" in
 		Y|y|Yes|yes|YES|"")
 		NOINSTALL=1
 		echo 1>&2 "Creating a simple ${CHROOT}${CONFIG}..."
 		return 0
 		;;
 		*)
 		echo "OK, quitting"
 		return 1
 		;;
 	    esac
 	else
 	    echo "OK, quitting"
 	    return 1
 	fi
 	;;
     esac
 }

 ## find out whether we have mac-fdisk or pdisk (they work the same)
 ckmacfdisk()
 {
     if (command -v mac-fdisk > /dev/null 2>&1) ; then
 	FDISK=mac-fdisk
     elif (command -v pdisk > /dev/null 2>&1) ; then
 	FDISK=pdisk
     else
 	echo 1>&2 "$PRG: Unable to locate mac-fdisk"
 	return 1
     fi

     if [ ! -x `command -v $FDISK` 2> /dev/null ] ; then
 	echo 1>&2 "$PRG: `command -v $FDISK`: Permission denied"
 	return 1
     fi
     debug "mac-fdisk is: $FDISK\n"
     return 0
 }

 ## find out if we have ddisk or fdisk (fdisk for dos labels) debian
 ## uses both names
 ckfdisk()
 {
     if (command -v ddisk > /dev/null 2>&1) ; then
 	FDISK=ddisk
     elif (command -v fdisk > /dev/null 2>&1) ; then
 	FDISK=fdisk
     else
 	echo 1>&2 "$PRG: Unable to locate fdisk"
 	return 1
     fi

     if [ ! -x `command -v $FDISK` 2> /dev/null ] ; then
 	echo 1>&2 "$PRG: `command -v $FDISK`: Permission denied"
 	return 1
     fi
     debug "fdisk is: $FDISK\n"
     return 0
 }

 ## find bootstrap partition, supports IBM CHRP with msdos disklabels
 findbootblock()
 {
     ## mac partition table magic == ER
     if [ "$(dd if="$DISK" bs=2 count=1 2> /dev/null)" = ER ] ; then
 	ckmacfdisk || return 1
 	if [ "$FDISK" = pdisk ] ; then
 	    ## handle braindamaged pdisk
 	    debug "dealing with pdisk deficiency...\n"
 	    BOOT="$(v=`$FDISK -l "$DISK" 2>/dev/null | grep '\<Apple_Bootstrap\>'` ; echo ${v%%:*})"
 	    debug "BOOT before fixup: $BOOT\n"
 	    if [ -n "$BOOT" ] ; then
 		BOOT="${DISK}${BOOT}"
 	    fi
 	    debug "BOOT after fixup: $BOOT\n"
 	else
 	    BOOT="$(v=`$FDISK -l "$DISK" 2>/dev/null | grep '\<Apple_Bootstrap\>'` ; echo ${v%%[ ]*})"
 	    debug "BOOT=$BOOT\n"
 	fi
 	if [ -z "$BOOT" ] ; then
 	    echo 1>&2 "$PRG: Unable to locate bootstrap partition on $DISK..."
 	    echo 1>&2 "$PRG: You must create an 800K type: Apple_Bootstrap partition to make the disk bootable"
 	    return 1
 	fi
     else
 	ckfdisk || return 1
 	BOOT="$(v=`$FDISK -l "$DISK" 2>/dev/null | grep '\<PPC PReP Boot\>'` ; echo ${v%%[ ]*})"
 	debug "BOOT=$BOOT\n"
 	if [ -z "$BOOT" ] ; then
 	    echo 1>&2 "$PRG: Unable to locate bootstrap partition on $DISK..."
 	    echo 1>&2 "$PRG: You must create an 800K type: 0x41 PPC PReP Boot partition to make the disk bootable"
 	    return 1
 	fi
     fi
     return 0
 }

 ## if readlink is missing use a kludge
 if (command -v readlink > /dev/null 2>&1) ; then
     true
 else
     readlink()
     {
 	SYMTARGET="$(v=`ls -l "$2" 2>/dev/null` ; echo ${v##*> })"
 	if [ -n "$SYMTARGET" ] ; then
 	    echo "$SYMTARGET"
 	    return 0
 	else
 	    return 1
 	fi
     }
 fi

 ## we have to do some things differently with a retarded devfs name.
 ckdevfs()
 {
     case "$1" in
 	/dev/ide/*|/dev/scsi/*|/dev/discs/*)
 	return 0
 	;;
 	*)
 	return 1
 	;;
     esac
 }

 cleanup()
 {
     if [ -n "$TMPCONF" ] ; then rm -f "$TMPCONF" ; fi
     return 0
 }

 ##########
 ## Main ##
 ##########

 if [ $# != 0 ] ; then
     while true ; do
         case "$1" in
             -V|--version)
                 version
                 exit 0
                 ;;
             -h|--help)
                 usage
                 exit 0
                 ;;
 	    -t|--chroot)
                 if [ -n "$2" ] ; then
                     CHROOT="$2"
                     shift 2
                 else
                     echo 1>&2 "$PRG: option requires an argument $1"
                     echo 1>&2 "Try \`$PRG --help' for more information."
                     exit 1
                 fi
 		;;
 	    -b|--boot)
                 if [ -n "$2" ] ; then
                     BOOT="$2"
                     shift 2
                 else
                     echo 1>&2 "$PRG: option requires an argument $1"
                     echo 1>&2 "Try \`$PRG --help' for more information."
                     exit 1
                 fi
 		;;
 	    -r|--root)
                 if [ -n "$2" ] ; then
                     ROOT="$2"
                     shift 2
                 else
                     echo 1>&2 "$PRG: option requires an argument $1"
                     echo 1>&2 "Try \`$PRG --help' for more information."
                     exit 1
                 fi
 		;;
 	    --kernel-args)
                 if [ -n "$2" ] ; then
                     KERNARGS="$2"
                     shift 2
                 else
                     echo 1>&2 "$PRG: option requires an argument $1"
                     echo 1>&2 "Try \`$PRG --help' for more information."
                     exit 1
                 fi
 		;;
 	    -q|--quiet)
 		QUIET=1
 		shift 1
 		;;
 	    --noinstall)
 		NOINSTALL=1
 		shift 1
 		;;
 	    --debug)
 		DEBUG=1
 		shift 1
 		;;
             "")
                 break
                 ;;
             *)
                 echo 1>&2 "$PRG: unrecognized option \`$1'"
                 echo 1>&2 "Try \`$PRG --help' for more information."
                 exit 1
                 ;;
         esac
     done
 fi

 if [ `id -u` != 0 ] ; then
     echo 1>&2 "$PRG: You are not root, go away"
     exit 1
 fi

 ## we need /proc because df does
 if [ ! -f /proc/uptime ] ; then
     echo 1>&2 "$PRG: This utility requires the /proc filesystem"
     exit 1
 fi

 ## check that chroot exists
 if [ -d "$CHROOT" ] ; then
     ## HACK: add trailing / to chroot, otherwise are paths later get b0rked.
     case "$CHROOT" in
 	*/)
 	true
 	;;
 	*)
 	CHROOT="${CHROOT}/"
 	;;
     esac
 elif [ ! -e "$CHROOT" ] ; then
     echo 1>&2 "$PRG: $CHROOT: No such file or directory"
     exit 1
 elif [ ! -d "$CHROOT" ] ; then
     echo 1>&2 "$PRG: $CHROOT: Not a directory"
     exit 1
 fi

 ## make sure the chroot is an actual root filesystem
 if [ ! -f "${CHROOT}etc/fstab" ] ; then
     echo 1>&2 "$PRG: $CHROOT does not appear to be a valid root filesystem"
     exit 1
 fi

 ## find / device
 if [ -z "$ROOT" ] ; then
     ## IMPORTANT! that last substitution is [<space><tab>] thats all ash will grok
     ROOT="$(v=`grep '^[^#].*[[:blank:]]/[[:blank:]]' ${CHROOT}etc/fstab` ; echo ${v%%[ 	]*})"
     debug "ROOT=$ROOT\n"
     if [ -z "$ROOT" ] ; then
 	echo 1>&2 "$PRG: Could not determine root partition, aborting..."
 	exit 1
     fi
 fi

 ## dereference label or uuid if necessary
 case "$ROOT" in
     LABEL=*|UUID=*)
 	if ! (command -v findfs > /dev/null 2>&1) ; then
 	    echo 1>&2 "$PRG: Unable to locate findfs, aborting..."
 	    exit 1
 	fi
 	ROOT="$(findfs "$ROOT")"
 	if [ -z "$ROOT" -o $? != 0 ] ; then
 	    echo 1>&2 "$PRG: Could not determine root partition, aborting..."
 	    exit 1
 	fi
 	;;
 esac

 ## make sure root device exists
 if [ ! -e "$ROOT" ] ; then
     echo 1>&2 "$PRG: $ROOT: No such file or directory"
     exit 1
 fi

 ## find root disk.
 if ckdevfs "$ROOT" ; then
     DISK="${ROOT%/*}/disc"
 else
     DISK="${ROOT%%[0-9]*}"
 fi
 if [ -z "$DISK" ] ; then
     echo 1>&2 "$PRG: Could not determine root disk, aborting..."
     exit 1
 fi

 ## make sure main disk exists
 if [ ! -e "$DISK" ] ; then
     echo 1>&2 "$PRG: $DISK: No such file or directory"
     exit 1
 fi

 ## find bootstrap partition
 if [ -z "$BOOT" ] ; then
     findbootblock || exit 1
 fi

 ## make sure bootstrap device exists
 if [ ! -e "$BOOT" ] ; then
     echo 1>&2 "$PRG: $BOOT: No such file or directory"
     exit 1
 fi

 ## sanity check
 for i in "$DISK" "$ROOT" "$BOOT" ; do
     if [ ! -b "$i" ] ; then
 	echo 1>&2 "$PRG: $i: Not a block device"
 	exit 1
     fi
 done

 ## unless --quiet ask permission to proceed
 if [ "$QUIET" = 0 ] ; then
     confirm || exit 2
 fi

 ## find the kernel in the usual places and (if not --quiet) ask the
 ## user if we cannot find one.
 if [ -f "${CHROOT}vmlinux" ] ; then
     KERNEL="${CHROOT}vmlinux"
     if [ -f "${CHROOT}initrd" ] ; then
 	INITRD="${CHROOT}initrd"
     elif [ -f "${CHROOT}initrd.img" ] ; then
 	INITRD="${CHROOT}initrd.img"
     elif [ -f "${CHROOT}initrd.gz" ] ; then
 	INITRD="${CHROOT}initrd.gz"
     fi
 elif [ -f "${CHROOT}boot/vmlinux" ] ; then
     KERNEL="${CHROOT}boot/vmlinux"
     if [ -f "${CHROOT}boot/initrd" ] ; then
 	INITRD="${CHROOT}boot/initrd"
     elif [ -f "${CHROOT}boot/initrd.img" ] ; then
 	INITRD="${CHROOT}boot/initrd.img"
     elif [ -f "${CHROOT}boot/initrd.gz" ] ; then
 	INITRD="${CHROOT}boot/initrd.gz"
     fi
 elif [ -f "${CHROOT}boot/vmlinux-`uname -r`" ] ; then
     KERNEL="${CHROOT}boot/vmlinux-`uname -r`"
     if [ -f "${CHROOT}boot/initrd-`uname -r`" ] ; then
 	INITRD="${CHROOT}boot/initrd-`uname -r`"
     elif [ -f "${CHROOT}boot/initrd-`uname -r`.img" ] ; then
 	INITRD="${CHROOT}boot/initrd-`uname -r`.img"
     elif [ -f "${CHROOT}boot/initrd-`uname -r`.gz" ] ; then
 	INITRD="${CHROOT}boot/initrd-`uname -r`.gz"
     fi
 elif [ -f "${CHROOT}vmlinux-`uname -r`" ] ; then
     KERNEL="${CHROOT}vmlinux-`uname -r`"
     if [ -f "${CHROOT}initrd-`uname -r`" ] ; then
 	INITRD="${CHROOT}initrd-`uname -r`"
     elif [ -f "${CHROOT}initrd-`uname -r`.img" ] ; then
 	INITRD="${CHROOT}initrd-`uname -r`.img"
     elif [ -f "${CHROOT}initrd-`uname -r`.gz" ] ; then
 	INITRD="${CHROOT}initrd-`uname -r`.gz"
     fi
 elif [ "$QUIET" = 0 ] ; then
     echo 1>&2 "$PRG: Cannot find a kernel, please locate one"
     while true ; do
 	$PRINTF 1>&2 "Enter path to a kernel image: "
 	read KERN
 	if [ -f "$KERN" ] ; then
 	    KERNEL="$KERN"
 	    break
 	elif [ ! -e "$KERN" ] ; then
 	    echo 1>&2 "$PRG: $KERN: No such file or directory"
 	elif [ -d "$KERN" ] ; then
 	    echo 1>&2 "$PRG: $KERN: Is a directory"
 	else
 	    echo 1>&2 "$PRG: $KERN: Is not a regular file"
 	fi
     done
     while true ; do
 	$PRINTF 1>&2 "Enter path to an initrd image (hit Enter for none): "
 	read IRD
 	if [ -z "$IRD" ] ; then
 	    break
 	fi
 	if [ -f "$IRD" ] ; then
 	    INITRD="$IRD"
 	    break
 	elif [ ! -e "$IRD" ] ; then
 	    echo 1>&2 "$PRG: $IRD: No such file or directory"
 	elif [ -d "$IRD" ] ; then
 	    echo 1>&2 "$PRG: $IRD: Is a directory"
 	else
 	    echo 1>&2 "$PRG: $IRD: Is not a regular file"
 	fi
     done
 else
     echo 1>&2 "$PRG: Cannot find a kernel, aborting..."
     exit 1
 fi

 debug "KERNEL=$KERNEL\n"
 debug "INITRD=$INITRD\n"

 ## get partition number the kernel lives on, and the OF device= name
 ## of the whole disk.
 KERNDEV="$(v=`df "$KERNEL" 2> /dev/null | grep ^/dev/` ; echo ${v%%[ ]*})"
 KERNDIR="$(v=`df "$KERNEL" 2> /dev/null | grep ^/dev/` ; echo ${v##*[ ]})"
 LINKDEV="$(v=`df "${KERNEL%/*}/" 2>/dev/null | grep ^/dev/` ; echo ${v%%[ ]*})"
 PARTITION="${KERNDEV##*[a-z]}"

 if ckdevfs "$KERNDEV" ; then
     KERNELDISK="${KERNDEV%/*}/disc"
 else
     KERNELDISK="${KERNDEV%%[0-9]*}"
 fi

 if [ -n "$INITRD" ] ; then
     ## get partition number the initrd lives on, and the OF device= name
     ## of the whole disk.
     IRDDEV="$(v=`df "$INITRD" 2> /dev/null | grep ^/dev/` ; echo ${v%%[ ]*})"
     IRDDIR="$(v=`df "$INITRD" 2> /dev/null | grep ^/dev/` ; echo ${v##*[ ]})"
     IRDLINKDEV="$(v=`df "${INITRD%/*}/" 2>/dev/null | grep ^/dev/` ; echo ${v%%[ ]*})"
     IRDPARTITION="${KERNDEV##*[a-z]}"

     if ckdevfs "$IRDDEV" ; then
 	INITRDDISK="${IRDDEV%/*}/disc"
     else
 	INITRDDISK="${IRDDEV%%[0-9]*}"
     fi
 fi

 debug "KERNEL=$KERNEL\nKERNDEV=$KERNDEV\nKERNDIR=$KERNDIR\nLINKDEV=$LINKDEV\nPARTITION=$PARTITION\nKERNELDISK=$KERNELDISK\n"

 if [ -n "$INITRD" ] ; then
     debug "INITRD=$INITRD\nIRDDEV=$IRDDEV\nIRDDIR=$IRDDIR\nIRDLINKDEV=$IRDLINKDEV\nIRDPARTITION=$IRDPARTITION\nINITRDDISK=$INITRDDISK\n"
 fi

 ## sanity check
 for i in "$KERNDEV" "$KERNDIR" "$LINKDEV" "$PARTITION" "$KERNELDISK" ; do
     if [ -z "$i" ] ; then
 	echo 1>&2 "$PRG: Could not determine necessary information, aborting..."
 	echo 1>&2 "$PRG: Are you using chroot $PRG instead of $PRG --chroot ?"
 	exit 1
     fi
 done

 if [ -n "$INITRD" ] ; then
     ## sanity check
     for i in "$IRDDEV" "$IRDDIR" "$IRDLINKDEV" "$IRDPARTITION" "$INITRDDISK" ; do
 	if [ -z "$i" ] ; then
 	    echo 1>&2 "$PRG: Could not determine necessary information, aborting..."
 	    echo 1>&2 "$PRG: Are you using chroot $PRG instead of $PRG --chroot ?"
 	    exit 1
 	fi
     done
 fi

 ## check for cross device symlink
 if [ -L "$KERNEL" ] ; then
     if [ "$KERNDEV" != "$LINKDEV" ] ; then
 	echo 1>&2 "$PRG: Warning: Cross device symlink $KERNEL, using it's target instead"
 	KERNEL="$(readlink -f "$KERNEL" 2>/dev/null)"
 	if [ ! -f "$KERNEL" ] ; then
 	    echo 1>&2 "$PRG: Unable to canonicalize symlink's target.  Do not create cross device symlinks."
 	    exit 1
 	fi
     fi
 fi

 if [ -n "$INITRD" ] ; then
     ## initrd must be on same device as kernel.
     if [ "$IRDDEV" != "$KERNDEV" -o "$IRDPARTITION" != "$IRDPARTITION" -o "$INITRDDISK" != "$KERNELDISK" ] ; then
 	echo 1>&2 "$PRG: Initrd image must be on same device as kernel image."
 	exit 1
     fi

     ## check for cross device symlink
     if [ -L "$INITRD" ] ; then
 	if [ "$IRDDEV" != "$IRDLINKDEV" ] ; then
 	    echo 1>&2 "$PRG: Warning: Cross device symlink $INITRD, using it's target instead"
 	    INITRD="$(readlink -f "$INITRD" 2>/dev/null)"
 	    if [ ! -f "$INITRD" ] ; then
 		echo 1>&2 "$PRG: Unable to canonicalize symlink's target.  Do not create cross device symlinks."
 		exit 1
 	    fi
 	fi
     fi
 fi

 ## only powermacs appear to need device=
 if (cat /proc/cpuinfo 2>/dev/null | grep -q pmac-generation 2> /dev/null) ; then
     DEVICE="\ndevice=$($OFPATH $KERNELDISK)"
     if [ $? != 0 ] ; then
 	echo 1>&2 "$PRG: Unable to determine OpenFirmware device name to $KERNELDISK, aborting..."
 	exit 1
     fi
 fi

 ## if there is a separate /boot partition we must strip off the /boot
 ## mountpoint or else yaboot will not find the kernel.
 if [ "$KERNDIR" != "$CHROOT" ] ; then
     IMAGE="${KERNEL##*$KERNDIR}"
 else
     IMAGE="$KERNEL"
 fi

 ## fix chrooted path
 if [ "$CHROOT" != / ] ; then
     IMAGE="${IMAGE##*$CHROOT}"
 fi

 ## fix relative path (caused by chroot path fix)
 case "$IMAGE" in
     /*)
     true
     ;;
     *)
     IMAGE="/${IMAGE}"
     ;;
 esac

 if [ -n "$INITRD" ] ; then
     ## if there is a separate /boot partition we must strip off the /boot
     ## mountpoint or else yaboot will not find the kernel.
     if [ "$IRDDIR" != "$CHROOT" ] ; then
 	INITRDIMG="${INITRD##*$IRDDIR}"
     else
 	INITRDIMG="$INITRD"
     fi

     ## fix chrooted path
     if [ "$CHROOT" != / ] ; then
 	INITRDIMG="${INITRDIMG##*$CHROOT}"
     fi

     ## fix relative path (caused by chroot path fix)
     case "$INITRDIMG" in
 	/*)
 	    true
 	    ;;
 	*)
 	    INITRDIMG="/${INITRDIMG}"
 	    ;;
     esac
 fi

 ## figure out if yaboot is installed in /usr/local or not
 if [ -f /usr/local/lib/yaboot/yaboot ] ; then
     INSTALL=/usr/local/lib/yaboot/yaboot
 elif [ -f /usr/lib/yaboot/yaboot ] ; then
     INSTALL=/usr/lib/yaboot/yaboot
 else
     echo 1>&2 "$PRG: yaboot is not installed correctly"
     exit 1
 fi

 ## newworld powermacs need the ofboot first stage loader
 if [ "$(v=`cat /proc/cpuinfo 2>/dev/null | grep pmac-generation` ; echo ${v##*:})" = NewWorld ] ; then
     if [ -f /usr/local/lib/yaboot/ofboot ] ; then
 	OFBOOT="\nmagicboot=/usr/local/lib/yaboot/ofboot"
     elif [ -f /usr/lib/yaboot/ofboot ] ; then
 	OFBOOT="\nmagicboot=/usr/lib/yaboot/ofboot"
     else
 	echo 1>&2 "$PRG: yaboot is not installed correctly"
 	exit 1
     fi
 fi

 ## check for properly (read debian) packaged yaboot.
 if [ -d ${CHROOT}usr/share/doc/yaboot/examples ] ; then
     HEADER="## see also: /usr/share/doc/yaboot/examples for example configurations.\n"
 fi

 ## setup append line
 if [ -n "$KERNARGS" ] ; then
     APPEND="\tappend=\"${KERNARGS}\"\n"
 fi

 ## avoid user confusion when they boot an installer with video=ofonly
 ## (usually via a install-safe label) and then reboot and have the box
 ## not boot properly again.
 if [ -z "$APPEND" ] ; then
     if (grep -q '\<video=ofonly\>' /proc/cmdline 2> /dev/null) ; then
 	APPEND="\tappend=\"video=ofonly\"\n"
     fi
 fi

 ## generate initrd= lines
 if [ -n "$INITRDIMG" ] ; then
     INITRDIMGS="\tinitrd=$INITRDIMG\n\tinitrd-size=8192\n"
 fi

 ## generate global section of yaboot.conf
 GLOBAL="## yaboot.conf generated by $PRG $VERSION
 ##
 ## run: \"man yaboot.conf\" for details. Do not make changes until you have!!
 ${HEADER}##
 ## For a dual-boot menu, add one or more of:
 ## bsd=/dev/hdaX, macos=/dev/hdaY, macosx=/dev/hdaZ\n
 boot=${BOOT}${DEVICE:-}
 partition=$PARTITION
 root=$ROOT
 timeout=30
 install=${INSTALL}${OFBOOT:-}\n"

 ## generate image= section
 IMAGES="
 image=$IMAGE
 \tlabel=Linux
 \tread-only\n${APPEND:-}${INITRDIMGS:-}"

 ## safely create a tmp file then move it into place after we are sure
 ## it was written.
 TMPCONF=`mktemp -q "${CHROOT}${CONFIG}.XXXXXX"`
 if [ $? != 0 ] ; then
     echo 1>&2 "$PRG: Unable to write to ${CHROOT}${CONFIG%/*}"
     exit 1
 fi

 $PRINTF "${GLOBAL}${IMAGES}" > "$TMPCONF"
 if [ $? != 0 ] ; then
     echo 1>&2 "$PRG: Unable to write temporary file ${TMPCONF}, aborting..."
     exit 1
 fi

 ## rotate backups of /etc/yaboot.conf, 3 backups are kept
 if [ -f "${CHROOT}${CONFIG}.old" ] ; then
     for i in 1 0 ; do
 	if [ -f "${CHROOT}${CONFIG}.old.${i}" ] ; then
 	    mv -f "${CHROOT}${CONFIG}.old.$i" "${CHROOT}${CONFIG}.old.$(($i + 1))"
 	    if [ $? != 0 ] ; then
 		echo 1>&2 "$PRG: Unable to make backup of existing ${CHROOT}${CONFIG}.old.$i, aborting..."
 		exit 1
 	    fi
 	fi
     done

     mv -f "${CHROOT}${CONFIG}.old" "${CHROOT}${CONFIG}.old.0"
     if [ $? != 0 ] ; then
 	echo 1>&2 "$PRG: Unable to make backup of existing ${CHROOT}${CONFIG}.old, aborting..."
 	exit 1
     fi
 fi

 ## backup /etc/yaboot.conf
 if [ -f "${CHROOT}${CONFIG}" ] ; then
     mv -f "${CHROOT}${CONFIG}" "${CHROOT}${CONFIG}.old"
     if [ $? != 0 ] ; then
 	echo 1>&2 "$PRG: Unable to make backup of existing ${CHROOT}${CONFIG}, aborting..."
 	exit 1
     fi
 fi

 ## move new config into place
 mv -f "${TMPCONF}" "${CHROOT}${CONFIG}"
 if [ $? != 0 ] ; then
     echo "$PRG: Unable to write file ${CHROOT}${CONFIG}"
     exit 1
 else
     ## nothing sensitive in generated config, comply with debian policy
     chmod 644 "${CHROOT}${CONFIG}"
 fi

 ## tell mkofboot where to find the config file if necessary
 if [ "${CHROOT}${CONFIG}" != /etc/yaboot.conf ] ; then
     YBINARGS="-C ${CHROOT}${CONFIG}"
 fi

 ## run mkofboot to install the bootstrap, unless --noinstall
 if [ "$NOINSTALL" = 0 ] ; then
     if (command -v mkofboot 2>&1 > /dev/null) ; then
 	[ "$QUIET" = 0 ] && echo "Running mkofboot to make the disk bootable..."
 	mkofboot -f $YBINARGS || exit 1
 	[ "$QUIET" = 0 ] && echo "Done"
     else
 	echo 1>&2 "$PRG: yaboot is not installed correctly, not running mkofboot"
 	exit 1
     fi
 fi

 exit 0
	#! /bin/sh

	###############################################################################
	##
	## yabootconfig generates a simple /etc/yaboot.conf
	## Copyright (C) 2001, 2002, 2003 Ethan Benson
	##
	## This program is free software; you can redistribute it and/or
	## modify it under the terms of the GNU General Public License
	## as published by the Free Software Foundation; either version 2
	## of the License, or (at your option) any later version.
	##
	## This program is distributed in the hope that it will be useful,
	## but WITHOUT ANY WARRANTY; without even the implied warranty of
	## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	## GNU General Public License for more details.
	##
	## You should have received a copy of the GNU General Public License
	## along with this program; if not, write to the Free Software
	## Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	##
	###############################################################################

	PATH="/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin"
	## allow to run out of /target in boot-floppies
	if [ -n "$PATH_PREFIX" ] ; then
	PATH="${PATH}:${PATH_PREFIX}/sbin:${PATH_PREFIX}/bin:${PATH_PREFIX}/usr/sbin:${PATH_PREFIX}/usr/bin:${PATH_PREFIX}/usr/local/sbin:${PATH_PREFIX}/usr/local/bin"
	fi
	PRG="${0##*/}"
	VERSION=1.0.8
	CHROOT=/
	## $CONFIG is relative to $CHROOT
	CONFIG=etc/yaboot.conf
	NOINSTALL=0
	QUIET=0
	DEBUG=0
	SIGINT="$PRG: Interrupt caught ... exiting"
	export LC_COLLATE=C

	## avoid older versions of ofpath shipped in debian boot-floppies etc.
	if [ -x "${PATH_PREFIX}/usr/sbin/ofpath" ] ; then
	OFPATH="${PATH_PREFIX}/usr/sbin/ofpath"
	else
	OFPATH=ofpath
	fi

	## catch signals, clean up temporary file
	trap "cleanup" 0
	trap "exit 129" 1
	trap "echo 1>&2 $SIGINT ; exit 130" 2
	trap "exit 131" 3
	trap "exit 143" 15

	## check for printf, use it if possible otherwise fall back on
	## unreliable echo -e -n ("SUS" says echo shall support no switches)
	if [ "$(printf printf_test 2>/dev/null)" = printf_test ] ; then
	PRINTF=printf
	else
	PRINTF="echo -e -n"
	fi

	## make sure echo is not lame if we must use it.
	if [ "$PRINTF" != printf ] ; then
	if [ "$(echo -e -n echo_test)" != "echo_test" ] ; then
	echo 1>&2 "$PRG: printf unavailable and echo is broken, sorry."
	exit 1
	fi
	fi

	## make fake `id' if its missing, outputs 0 since if its missing we
	## are probably running on boot floppies and thus are root.
	if (command -v id > /dev/null 2>&1) ; then
	true
	else
	id()
	{
	echo 0
	}
	fi

	## --version output
	version()
	{
	echo \
	"$PRG $VERSION
	Written by Ethan Benson

	Copyright (C) 2001, 2002, 2003 Ethan Benson
	This is free software; see the source for copying conditions. There is NO
	warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
	}

	## --help output.
	usage()
	{
	echo \
	"Usage: $PRG [OPTION]...
	Generate a working /etc/yaboot.conf.

	-t, --chroot set root directory $PRG should work from
	-r, --root set root partition, Example: /dev/hda3
	default: determined from {chroot}/etc/fstab
	-b, --boot set bootstrap partition, Example: /dev/hda2
	default: first type: Apple_Bootstrap partition
	--kernel-args add an append= line with specified arguments
	-q, --quiet don't ask any questions/confirmation
	--noinstall don't automatically run mkofboot
	-h, --help display this help and exit
	-V, --version output version information and exit"
	}

	debug()
	{
	[ "$DEBUG" = 0 ] && return 0
	$PRINTF 1>&2 "$PRG: DEBUG: $1"
	}

	confirm()
	{
	$PRINTF \
	"yaboot is the Linux Loader for PowerPC. $PRG sets up your system to boot directly
	from your hard disk, without the need for a boot CD, floppy or a network boot.\n"
	[ "$NOINSTALL" = 0 ] && $PRINTF "Install yaboot bootstrap on $BOOT to boot Linux from $ROOT? [Yes] "
	[ "$NOINSTALL" = 1 ] && $PRINTF "Create simple ${CHROOT}${CONFIG} to boot Linux from $ROOT? [Yes] "
	read ans
	case "$ans" in
	Y\|y\|Yes\|yes\|YES\|"")
	echo "Creating a simple ${CHROOT}${CONFIG}..."
	return 0
	;;
	*)
	if [ "$NOINSTALL" = 0 ] ; then
	$PRINTF "Create simple ${CHROOT}${CONFIG} without installing the bootstrap? [Yes] "
	read ans
	case "$ans" in
	Y\|y\|Yes\|yes\|YES\|"")
	NOINSTALL=1
	echo 1>&2 "Creating a simple ${CHROOT}${CONFIG}..."
	return 0
	;;
	*)
	echo "OK, quitting"
	return 1
	;;
	esac
	else
	echo "OK, quitting"
	return 1
	fi
	;;
	esac
	}

	## find out whether we have mac-fdisk or pdisk (they work the same)
	ckmacfdisk()
	{
	if (command -v mac-fdisk > /dev/null 2>&1) ; then
	FDISK=mac-fdisk
	elif (command -v pdisk > /dev/null 2>&1) ; then
	FDISK=pdisk
	else
	echo 1>&2 "$PRG: Unable to locate mac-fdisk"
	return 1
	fi

	if [ ! -x `command -v $FDISK` 2> /dev/null ] ; then
	echo 1>&2 "$PRG: `command -v $FDISK`: Permission denied"
	return 1
	fi
	debug "mac-fdisk is: $FDISK\n"
	return 0
	}

	## find out if we have ddisk or fdisk (fdisk for dos labels) debian
	## uses both names
	ckfdisk()
	{
	if (command -v ddisk > /dev/null 2>&1) ; then
	FDISK=ddisk
	elif (command -v fdisk > /dev/null 2>&1) ; then
	FDISK=fdisk
	else
	echo 1>&2 "$PRG: Unable to locate fdisk"
	return 1
	fi

	if [ ! -x `command -v $FDISK` 2> /dev/null ] ; then
	echo 1>&2 "$PRG: `command -v $FDISK`: Permission denied"
	return 1
	fi
	debug "fdisk is: $FDISK\n"
	return 0
	}

	## find bootstrap partition, supports IBM CHRP with msdos disklabels
	findbootblock()
	{
	## mac partition table magic == ER
	if [ "$(dd if="$DISK" bs=2 count=1 2> /dev/null)" = ER ] ; then
	ckmacfdisk \|\| return 1
	if [ "$FDISK" = pdisk ] ; then
	## handle braindamaged pdisk
	debug "dealing with pdisk deficiency...\n"
	BOOT="$(v=`$FDISK -l "$DISK" 2>/dev/null \| grep '\<Apple_Bootstrap\>'` ; echo ${v%%:*})"
	debug "BOOT before fixup: $BOOT\n"
	if [ -n "$BOOT" ] ; then
	BOOT="${DISK}${BOOT}"
	fi
	debug "BOOT after fixup: $BOOT\n"
	else
	BOOT="$(v=`$FDISK -l "$DISK" 2>/dev/null \| grep '\<Apple_Bootstrap\>'` ; echo ${v%%[ ]*})"
	debug "BOOT=$BOOT\n"
	fi
	if [ -z "$BOOT" ] ; then
	echo 1>&2 "$PRG: Unable to locate bootstrap partition on $DISK..."
	echo 1>&2 "$PRG: You must create an 800K type: Apple_Bootstrap partition to make the disk bootable"
	return 1
	fi
	else
	ckfdisk \|\| return 1
	BOOT="$(v=`$FDISK -l "$DISK" 2>/dev/null \| grep '\<PPC PReP Boot\>'` ; echo ${v%%[ ]*})"
	debug "BOOT=$BOOT\n"
	if [ -z "$BOOT" ] ; then
	echo 1>&2 "$PRG: Unable to locate bootstrap partition on $DISK..."
	echo 1>&2 "$PRG: You must create an 800K type: 0x41 PPC PReP Boot partition to make the disk bootable"
	return 1
	fi
	fi
	return 0
	}

	## if readlink is missing use a kludge
	if (command -v readlink > /dev/null 2>&1) ; then
	true
	else
	readlink()
	{
	SYMTARGET="$(v=`ls -l "$2" 2>/dev/null` ; echo ${v##*> })"
	if [ -n "$SYMTARGET" ] ; then
	echo "$SYMTARGET"
	return 0
	else
	return 1
	fi
	}
	fi

	## we have to do some things differently with a retarded devfs name.
	ckdevfs()
	{
	case "$1" in
	/dev/ide/\|/dev/scsi/\|/dev/discs/*)
	return 0
	;;
	*)
	return 1
	;;
	esac
	}

	cleanup()
	{
	if [ -n "$TMPCONF" ] ; then rm -f "$TMPCONF" ; fi
	return 0
	}

	##########
	## Main ##
	##########

	if [ $# != 0 ] ; then
	while true ; do
	case "$1" in
	-V\|--version)
	version
	exit 0
	;;
	-h\|--help)
	usage
	exit 0
	;;
	-t\|--chroot)
	if [ -n "$2" ] ; then
	CHROOT="$2"
	shift 2
	else
	echo 1>&2 "$PRG: option requires an argument $1"
	echo 1>&2 "Try \`$PRG --help' for more information."
	exit 1
	fi
	;;
	-b\|--boot)
	if [ -n "$2" ] ; then
	BOOT="$2"
	shift 2
	else
	echo 1>&2 "$PRG: option requires an argument $1"
	echo 1>&2 "Try \`$PRG --help' for more information."
	exit 1
	fi
	;;
	-r\|--root)
	if [ -n "$2" ] ; then
	ROOT="$2"
	shift 2
	else
	echo 1>&2 "$PRG: option requires an argument $1"
	echo 1>&2 "Try \`$PRG --help' for more information."
	exit 1
	fi
	;;
	--kernel-args)
	if [ -n "$2" ] ; then
	KERNARGS="$2"
	shift 2
	else
	echo 1>&2 "$PRG: option requires an argument $1"
	echo 1>&2 "Try \`$PRG --help' for more information."
	exit 1
	fi
	;;
	-q\|--quiet)
	QUIET=1
	shift 1
	;;
	--noinstall)
	NOINSTALL=1
	shift 1
	;;
	--debug)
	DEBUG=1
	shift 1
	;;
	"")
	break
	;;
	*)
	echo 1>&2 "$PRG: unrecognized option \`$1'"
	echo 1>&2 "Try \`$PRG --help' for more information."
	exit 1
	;;
	esac
	done
	fi

	if [ `id -u` != 0 ] ; then
	echo 1>&2 "$PRG: You are not root, go away"
	exit 1
	fi

	## we need /proc because df does
	if [ ! -f /proc/uptime ] ; then
	echo 1>&2 "$PRG: This utility requires the /proc filesystem"
	exit 1
	fi

	## check that chroot exists
	if [ -d "$CHROOT" ] ; then
	## HACK: add trailing / to chroot, otherwise are paths later get b0rked.
	case "$CHROOT" in
	*/)
	true
	;;
	*)
	CHROOT="${CHROOT}/"
	;;
	esac
	elif [ ! -e "$CHROOT" ] ; then
	echo 1>&2 "$PRG: $CHROOT: No such file or directory"
	exit 1
	elif [ ! -d "$CHROOT" ] ; then
	echo 1>&2 "$PRG: $CHROOT: Not a directory"
	exit 1
	fi

	## make sure the chroot is an actual root filesystem
	if [ ! -f "${CHROOT}etc/fstab" ] ; then
	echo 1>&2 "$PRG: $CHROOT does not appear to be a valid root filesystem"
	exit 1
	fi

	## find / device
	if [ -z "$ROOT" ] ; then
	## IMPORTANT! that last substitution is [<space><tab>] thats all ash will grok
	ROOT="$(v=`grep '^[^#].[[:blank:]]/[[:blank:]]' ${CHROOT}etc/fstab` ; echo ${v%%[ ]})"
	debug "ROOT=$ROOT\n"
	if [ -z "$ROOT" ] ; then
	echo 1>&2 "$PRG: Could not determine root partition, aborting..."
	exit 1
	fi
	fi

	## dereference label or uuid if necessary
	case "$ROOT" in
	LABEL=\|UUID=)
	if ! (command -v findfs > /dev/null 2>&1) ; then
	echo 1>&2 "$PRG: Unable to locate findfs, aborting..."
	exit 1
	fi
	ROOT="$(findfs "$ROOT")"
	if [ -z "$ROOT" -o $? != 0 ] ; then
	echo 1>&2 "$PRG: Could not determine root partition, aborting..."
	exit 1
	fi
	;;
	esac

	## make sure root device exists
	if [ ! -e "$ROOT" ] ; then
	echo 1>&2 "$PRG: $ROOT: No such file or directory"
	exit 1
	fi

	## find root disk.
	if ckdevfs "$ROOT" ; then
	DISK="${ROOT%/*}/disc"
	else
	DISK="${ROOT%%[0-9]*}"
	fi
	if [ -z "$DISK" ] ; then
	echo 1>&2 "$PRG: Could not determine root disk, aborting..."
	exit 1
	fi

	## make sure main disk exists
	if [ ! -e "$DISK" ] ; then
	echo 1>&2 "$PRG: $DISK: No such file or directory"
	exit 1
	fi

	## find bootstrap partition
	if [ -z "$BOOT" ] ; then
	findbootblock \|\| exit 1
	fi

	## make sure bootstrap device exists
	if [ ! -e "$BOOT" ] ; then
	echo 1>&2 "$PRG: $BOOT: No such file or directory"
	exit 1
	fi

	## sanity check
	for i in "$DISK" "$ROOT" "$BOOT" ; do
	if [ ! -b "$i" ] ; then
	echo 1>&2 "$PRG: $i: Not a block device"
	exit 1
	fi
	done

	## unless --quiet ask permission to proceed
	if [ "$QUIET" = 0 ] ; then
	confirm \|\| exit 2
	fi

	## find the kernel in the usual places and (if not --quiet) ask the
	## user if we cannot find one.
	if [ -f "${CHROOT}vmlinux" ] ; then
	KERNEL="${CHROOT}vmlinux"
	if [ -f "${CHROOT}initrd" ] ; then
	INITRD="${CHROOT}initrd"
	elif [ -f "${CHROOT}initrd.img" ] ; then
	INITRD="${CHROOT}initrd.img"
	elif [ -f "${CHROOT}initrd.gz" ] ; then
	INITRD="${CHROOT}initrd.gz"
	fi
	elif [ -f "${CHROOT}boot/vmlinux" ] ; then
	KERNEL="${CHROOT}boot/vmlinux"
	if [ -f "${CHROOT}boot/initrd" ] ; then
	INITRD="${CHROOT}boot/initrd"
	elif [ -f "${CHROOT}boot/initrd.img" ] ; then
	INITRD="${CHROOT}boot/initrd.img"
	elif [ -f "${CHROOT}boot/initrd.gz" ] ; then
	INITRD="${CHROOT}boot/initrd.gz"
	fi
	elif [ -f "${CHROOT}boot/vmlinux-`uname -r`" ] ; then
	KERNEL="${CHROOT}boot/vmlinux-`uname -r`"
	if [ -f "${CHROOT}boot/initrd-`uname -r`" ] ; then
	INITRD="${CHROOT}boot/initrd-`uname -r`"
	elif [ -f "${CHROOT}boot/initrd-`uname -r`.img" ] ; then
	INITRD="${CHROOT}boot/initrd-`uname -r`.img"
	elif [ -f "${CHROOT}boot/initrd-`uname -r`.gz" ] ; then
	INITRD="${CHROOT}boot/initrd-`uname -r`.gz"
	fi
	elif [ -f "${CHROOT}vmlinux-`uname -r`" ] ; then
	KERNEL="${CHROOT}vmlinux-`uname -r`"
	if [ -f "${CHROOT}initrd-`uname -r`" ] ; then
	INITRD="${CHROOT}initrd-`uname -r`"
	elif [ -f "${CHROOT}initrd-`uname -r`.img" ] ; then
	INITRD="${CHROOT}initrd-`uname -r`.img"
	elif [ -f "${CHROOT}initrd-`uname -r`.gz" ] ; then
	INITRD="${CHROOT}initrd-`uname -r`.gz"
	fi
	elif [ "$QUIET" = 0 ] ; then
	echo 1>&2 "$PRG: Cannot find a kernel, please locate one"
	while true ; do
	$PRINTF 1>&2 "Enter path to a kernel image: "
	read KERN
	if [ -f "$KERN" ] ; then
	KERNEL="$KERN"
	break
	elif [ ! -e "$KERN" ] ; then
	echo 1>&2 "$PRG: $KERN: No such file or directory"
	elif [ -d "$KERN" ] ; then
	echo 1>&2 "$PRG: $KERN: Is a directory"
	else
	echo 1>&2 "$PRG: $KERN: Is not a regular file"
	fi
	done
	while true ; do
	$PRINTF 1>&2 "Enter path to an initrd image (hit Enter for none): "
	read IRD
	if [ -z "$IRD" ] ; then
	break
	fi
	if [ -f "$IRD" ] ; then
	INITRD="$IRD"
	break
	elif [ ! -e "$IRD" ] ; then
	echo 1>&2 "$PRG: $IRD: No such file or directory"
	elif [ -d "$IRD" ] ; then
	echo 1>&2 "$PRG: $IRD: Is a directory"
	else
	echo 1>&2 "$PRG: $IRD: Is not a regular file"
	fi
	done
	else
	echo 1>&2 "$PRG: Cannot find a kernel, aborting..."
	exit 1
	fi

	debug "KERNEL=$KERNEL\n"
	debug "INITRD=$INITRD\n"

	## get partition number the kernel lives on, and the OF device= name
	## of the whole disk.
	KERNDEV="$(v=`df "$KERNEL" 2> /dev/null \| grep ^/dev/` ; echo ${v%%[ ]*})"
	KERNDIR="$(v=`df "$KERNEL" 2> /dev/null \| grep ^/dev/` ; echo ${v##*[ ]})"
	LINKDEV="$(v=`df "${KERNEL%/}/" 2>/dev/null \| grep ^/dev/` ; echo ${v%%[ ]})"
	PARTITION="${KERNDEV##*[a-z]}"

	if ckdevfs "$KERNDEV" ; then
	KERNELDISK="${KERNDEV%/*}/disc"
	else
	KERNELDISK="${KERNDEV%%[0-9]*}"
	fi

	if [ -n "$INITRD" ] ; then
	## get partition number the initrd lives on, and the OF device= name
	## of the whole disk.
	IRDDEV="$(v=`df "$INITRD" 2> /dev/null \| grep ^/dev/` ; echo ${v%%[ ]*})"
	IRDDIR="$(v=`df "$INITRD" 2> /dev/null \| grep ^/dev/` ; echo ${v##*[ ]})"
	IRDLINKDEV="$(v=`df "${INITRD%/}/" 2>/dev/null \| grep ^/dev/` ; echo ${v%%[ ]})"
	IRDPARTITION="${KERNDEV##*[a-z]}"

	if ckdevfs "$IRDDEV" ; then
	INITRDDISK="${IRDDEV%/*}/disc"
	else
	INITRDDISK="${IRDDEV%%[0-9]*}"
	fi
	fi

	debug "KERNEL=$KERNEL\nKERNDEV=$KERNDEV\nKERNDIR=$KERNDIR\nLINKDEV=$LINKDEV\nPARTITION=$PARTITION\nKERNELDISK=$KERNELDISK\n"

	if [ -n "$INITRD" ] ; then
	debug "INITRD=$INITRD\nIRDDEV=$IRDDEV\nIRDDIR=$IRDDIR\nIRDLINKDEV=$IRDLINKDEV\nIRDPARTITION=$IRDPARTITION\nINITRDDISK=$INITRDDISK\n"
	fi

	## sanity check
	for i in "$KERNDEV" "$KERNDIR" "$LINKDEV" "$PARTITION" "$KERNELDISK" ; do
	if [ -z "$i" ] ; then
	echo 1>&2 "$PRG: Could not determine necessary information, aborting..."
	echo 1>&2 "$PRG: Are you using chroot $PRG instead of $PRG --chroot ?"
	exit 1
	fi
	done

	if [ -n "$INITRD" ] ; then
	## sanity check
	for i in "$IRDDEV" "$IRDDIR" "$IRDLINKDEV" "$IRDPARTITION" "$INITRDDISK" ; do
	if [ -z "$i" ] ; then
	echo 1>&2 "$PRG: Could not determine necessary information, aborting..."
	echo 1>&2 "$PRG: Are you using chroot $PRG instead of $PRG --chroot ?"
	exit 1
	fi
	done
	fi

	## check for cross device symlink
	if [ -L "$KERNEL" ] ; then
	if [ "$KERNDEV" != "$LINKDEV" ] ; then
	echo 1>&2 "$PRG: Warning: Cross device symlink $KERNEL, using it's target instead"
	KERNEL="$(readlink -f "$KERNEL" 2>/dev/null)"
	if [ ! -f "$KERNEL" ] ; then
	echo 1>&2 "$PRG: Unable to canonicalize symlink's target. Do not create cross device symlinks."
	exit 1
	fi
	fi
	fi

	if [ -n "$INITRD" ] ; then
	## initrd must be on same device as kernel.
	if [ "$IRDDEV" != "$KERNDEV" -o "$IRDPARTITION" != "$IRDPARTITION" -o "$INITRDDISK" != "$KERNELDISK" ] ; then
	echo 1>&2 "$PRG: Initrd image must be on same device as kernel image."
	exit 1
	fi

	## check for cross device symlink
	if [ -L "$INITRD" ] ; then
	if [ "$IRDDEV" != "$IRDLINKDEV" ] ; then
	echo 1>&2 "$PRG: Warning: Cross device symlink $INITRD, using it's target instead"
	INITRD="$(readlink -f "$INITRD" 2>/dev/null)"
	if [ ! -f "$INITRD" ] ; then
	echo 1>&2 "$PRG: Unable to canonicalize symlink's target. Do not create cross device symlinks."
	exit 1
	fi
	fi
	fi
	fi

	## only powermacs appear to need device=
	if (cat /proc/cpuinfo 2>/dev/null \| grep -q pmac-generation 2> /dev/null) ; then
	DEVICE="\ndevice=$($OFPATH $KERNELDISK)"
	if [ $? != 0 ] ; then
	echo 1>&2 "$PRG: Unable to determine OpenFirmware device name to $KERNELDISK, aborting..."
	exit 1
	fi
	fi

	## if there is a separate /boot partition we must strip off the /boot
	## mountpoint or else yaboot will not find the kernel.
	if [ "$KERNDIR" != "$CHROOT" ] ; then
	IMAGE="${KERNEL##*$KERNDIR}"
	else
	IMAGE="$KERNEL"
	fi

	## fix chrooted path
	if [ "$CHROOT" != / ] ; then
	IMAGE="${IMAGE##*$CHROOT}"
	fi

	## fix relative path (caused by chroot path fix)
	case "$IMAGE" in
	/*)
	true
	;;
	*)
	IMAGE="/${IMAGE}"
	;;
	esac

	if [ -n "$INITRD" ] ; then
	## if there is a separate /boot partition we must strip off the /boot
	## mountpoint or else yaboot will not find the kernel.
	if [ "$IRDDIR" != "$CHROOT" ] ; then
	INITRDIMG="${INITRD##*$IRDDIR}"
	else
	INITRDIMG="$INITRD"
	fi

	## fix chrooted path
	if [ "$CHROOT" != / ] ; then
	INITRDIMG="${INITRDIMG##*$CHROOT}"
	fi

	## fix relative path (caused by chroot path fix)
	case "$INITRDIMG" in
	/*)
	true
	;;
	*)
	INITRDIMG="/${INITRDIMG}"
	;;
	esac
	fi

	## figure out if yaboot is installed in /usr/local or not
	if [ -f /usr/local/lib/yaboot/yaboot ] ; then
	INSTALL=/usr/local/lib/yaboot/yaboot
	elif [ -f /usr/lib/yaboot/yaboot ] ; then
	INSTALL=/usr/lib/yaboot/yaboot
	else
	echo 1>&2 "$PRG: yaboot is not installed correctly"
	exit 1
	fi

	## newworld powermacs need the ofboot first stage loader
	if [ "$(v=`cat /proc/cpuinfo 2>/dev/null \| grep pmac-generation` ; echo ${v##*:})" = NewWorld ] ; then
	if [ -f /usr/local/lib/yaboot/ofboot ] ; then
	OFBOOT="\nmagicboot=/usr/local/lib/yaboot/ofboot"
	elif [ -f /usr/lib/yaboot/ofboot ] ; then
	OFBOOT="\nmagicboot=/usr/lib/yaboot/ofboot"
	else
	echo 1>&2 "$PRG: yaboot is not installed correctly"
	exit 1
	fi
	fi

	## check for properly (read debian) packaged yaboot.
	if [ -d ${CHROOT}usr/share/doc/yaboot/examples ] ; then
	HEADER="## see also: /usr/share/doc/yaboot/examples for example configurations.\n"
	fi

	## setup append line
	if [ -n "$KERNARGS" ] ; then
	APPEND="\tappend=\"${KERNARGS}\"\n"
	fi

	## avoid user confusion when they boot an installer with video=ofonly
	## (usually via a install-safe label) and then reboot and have the box
	## not boot properly again.
	if [ -z "$APPEND" ] ; then
	if (grep -q '\<video=ofonly\>' /proc/cmdline 2> /dev/null) ; then
	APPEND="\tappend=\"video=ofonly\"\n"
	fi
	fi

	## generate initrd= lines
	if [ -n "$INITRDIMG" ] ; then
	INITRDIMGS="\tinitrd=$INITRDIMG\n\tinitrd-size=8192\n"
	fi

	## generate global section of yaboot.conf
	GLOBAL="## yaboot.conf generated by $PRG $VERSION
	##
	## run: \"man yaboot.conf\" for details. Do not make changes until you have!!
	${HEADER}##
	## For a dual-boot menu, add one or more of:
	## bsd=/dev/hdaX, macos=/dev/hdaY, macosx=/dev/hdaZ\n
	boot=${BOOT}${DEVICE:-}
	partition=$PARTITION
	root=$ROOT
	timeout=30
	install=${INSTALL}${OFBOOT:-}\n"

	## generate image= section
	IMAGES="
	image=$IMAGE
	\tlabel=Linux
	\tread-only\n${APPEND:-}${INITRDIMGS:-}"

	## safely create a tmp file then move it into place after we are sure
	## it was written.
	TMPCONF=`mktemp -q "${CHROOT}${CONFIG}.XXXXXX"`
	if [ $? != 0 ] ; then
	echo 1>&2 "$PRG: Unable to write to ${CHROOT}${CONFIG%/*}"
	exit 1
	fi

	$PRINTF "${GLOBAL}${IMAGES}" > "$TMPCONF"
	if [ $? != 0 ] ; then
	echo 1>&2 "$PRG: Unable to write temporary file ${TMPCONF}, aborting..."
	exit 1
	fi

	## rotate backups of /etc/yaboot.conf, 3 backups are kept
	if [ -f "${CHROOT}${CONFIG}.old" ] ; then
	for i in 1 0 ; do
	if [ -f "${CHROOT}${CONFIG}.old.${i}" ] ; then
	mv -f "${CHROOT}${CONFIG}.old.$i" "${CHROOT}${CONFIG}.old.$(($i + 1))"
	if [ $? != 0 ] ; then
	echo 1>&2 "$PRG: Unable to make backup of existing ${CHROOT}${CONFIG}.old.$i, aborting..."
	exit 1
	fi
	fi
	done

	mv -f "${CHROOT}${CONFIG}.old" "${CHROOT}${CONFIG}.old.0"
	if [ $? != 0 ] ; then
	echo 1>&2 "$PRG: Unable to make backup of existing ${CHROOT}${CONFIG}.old, aborting..."
	exit 1
	fi
	fi

	## backup /etc/yaboot.conf
	if [ -f "${CHROOT}${CONFIG}" ] ; then
	mv -f "${CHROOT}${CONFIG}" "${CHROOT}${CONFIG}.old"
	if [ $? != 0 ] ; then
	echo 1>&2 "$PRG: Unable to make backup of existing ${CHROOT}${CONFIG}, aborting..."
	exit 1
	fi
	fi

	## move new config into place
	mv -f "${TMPCONF}" "${CHROOT}${CONFIG}"
	if [ $? != 0 ] ; then
	echo "$PRG: Unable to write file ${CHROOT}${CONFIG}"
	exit 1
	else
	## nothing sensitive in generated config, comply with debian policy
	chmod 644 "${CHROOT}${CONFIG}"
	fi

	## tell mkofboot where to find the config file if necessary
	if [ "${CHROOT}${CONFIG}" != /etc/yaboot.conf ] ; then
	YBINARGS="-C ${CHROOT}${CONFIG}"
	fi

	## run mkofboot to install the bootstrap, unless --noinstall
	if [ "$NOINSTALL" = 0 ] ; then
	if (command -v mkofboot 2>&1 > /dev/null) ; then
	[ "$QUIET" = 0 ] && echo "Running mkofboot to make the disk bootable..."
	mkofboot -f $YBINARGS \|\| exit 1
	[ "$QUIET" = 0 ] && echo "Done"
	else
	echo 1>&2 "$PRG: yaboot is not installed correctly, not running mkofboot"
	exit 1
	fi
	fi

	exit 0