minix/tools/mkboot

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#!/bin/sh
#
# mkboot 2.0 - make boot floppy, make root device bootable, etc.
# Author: Kees J. Bot
trap 'e=$?; rm -f /tmp/mkb.$$; exit $e' 0 2
mdec=/usr/mdec # bootstraps
# Check arguments.
case "$#:$1" in
1:bootable | 1:hdboot | [12]:fdboot )
action=$1 dev=$2 size=$3
;;
*) echo "Usage: $0 [bootable | hdboot | fdboot [device]]" >&2
exit 1
esac
# Get the device table.
. /etc/fstab
# The real root device may be the RAM disk.
realroot=`printroot -r`
# If it's an initial fstab, pretend root is real root
if [ $root = "/dev/ROOT" ]
then root=$realroot
fi
case $action in
bootable | hdboot)
# We need the root device.
if [ $realroot = $root ]
then
rootdir=
else
umount $root 2>/dev/null
mount $root /mnt || exit
rootdir=/mnt
fi
esac
case $action in
bootable)
# Install the boot monitor on the root device and make it bootable.
install -cs -m 644 $mdec/boot $rootdir/boot/boot || exit
sync
installboot -device $root $mdec/bootblock /boot/boot || exit
test $realroot != $root && umount $root
;;
hdboot)
# Install a new image on the root device.
if [ ! -d $rootdir/boot/image ]
then
# /boot/image is not yet a directory! Fix it.
su root -c \
"exec mv $rootdir/boot/image /M"
install -d $rootdir/boot/image
su root -c \
"exec mv $rootdir/M $rootdir/boot/image/`uname -r`"
fi
sh tell_config OS_RELEASE . OS_VERSION >/tmp/mkb.$$
version=`sed 's/[" ]//g;/^$/d' </tmp/mkb.$$`
# Retrieve the git revision; this only succeeds
# if git is available, it's a git checkout, *and*
# there are no uncommitted changes.
if git diff --quiet 2>/dev/null
then gitrev="-`git describe --always`"
fi
revision=`cat revision 2>/dev/null`
if [ -z "$revision" ]
then rrevision=""
gitrev=""
else rrevision=r$revision
fi
oldrev=$revision
if [ -z "$revision" ]
then
revision=0
rrevision=""
else
revision=`expr $revision + 1`
rrevision=r$revision
fi
target="${version}${rrevision}${gitrev}"
set -- `ls -t $rootdir/boot/image`
case $# in
0|1|2|3)
# Not much there, do not remove a thing.
;;
*)
# Remove the third-newest image in /boot/image, but
# only if there's an older one (which is kept).
echo "rm $root:/boot/image/$3"
rm -f "$rootdir/boot/image/$3"
esac
# Install the new image.
echo "install image $root:/boot/image/$target"
install -o root -m 600 image $rootdir/boot/image/$target || exit
# Tell GRUB which image is newest
image_latest="`ls -t $rootdir/boot/image | head -n 1`"
if [ -f "$rootdir/boot/image/$image_latest" ]
then image_latest="/boot/image/$image_latest"
else image_latest=/boot/image_big
fi
ln -f $image_latest $rootdir/boot/image_latest
# Save the revision number.
test "$revision" != "$oldrev" && echo $revision >revision
test $realroot != $root && umount $root
echo "Done."
;;
fdboot)
# fdboot: Make a boot floppy.
if [ -z "$dev" ]
then
echo -n \
"Finish the name of the floppy device to write (by default 'fd0'): /dev/";
read dev
case "$dev" in
'') dev=/dev/fd0
;;
/dev/*)
;;
*) dev=/dev/$dev
esac
fi
# Make a file system.
umount $dev 2>/dev/null
if mkfs -B 1024 -i 512 $dev
then :
else
echo "mkfs of $dev failed."
exit 1;
fi
# Install /dev, /boot/boot and /boot/image.
mount $dev /mnt || exit
mkdir -p /mnt/boot/image || exit
cpdir /dev /mnt/dev || exit
cp -p $mdec/boot /mnt/boot/boot || exit
cp -p image /mnt/boot/image/ || exit
umount $dev || exit
# Make bootable and copy the boot parameters.
installboot -d $dev $mdec/bootblock /boot/boot || exit
pfile=fdbootparams
if [ -f $pfile ]
then echo "Using floppy boot parameters from file $pfile."
edparams $dev "`cat $pfile`" || exit
else echo "Copying floppy boot parameters from $root."
dd if=$root of=$dev skip=1 seek=1 count=1 conv=silent || exit
fi
edparams $dev 'main(){delay 2000;boot}; save' || exit
echo "Test kernel installed on $dev"
;;
esac
sync
exit 0