mkrescue

linux 的引导程序源码The Microsoft&reg Windows&reg Software Development Kit (SDK) provides the documentation

#!/bin/bash
#
# mkrescue
#
#	30-Oct-2001	original version 1.0
#
# Revision history:
#	09-Apr-2002	John Coffman	modify for lilo 22.3   1.1
#	09-Jun-2002	John Coffman	get keyboard translation table 1.2
#					(suggested by Qing Liu)
#

debug=false
version=1.2

usage () {
    cat <<EOF

usage:	`basename $0` [--help]
	`basename $0` [--version]
	`basename $0` [--device <device>] [--fast] [--fs ext2|msdos|minix]
		[--initrd <file> --kernel <file>] [--keymap <keymap.ktl>] 
		[--nocompact] [--noformat] [--root <device>]

  --device  is the floppy drive; e.g.,  /dev/fd0
  --fast  specifies creation using a loopback device, which may be faster
  --fs  is the filesystem to make on the device; e.g.,  ext2
  --help  prints this helpfile
  --initrd and --kernel  are the initial ramdisk & kernel files
  --keymap  is the keyboard translation table; default to same as lilo.conf
  --noformat  bypasses creation of a new filesystem on device
  --nocompact  omits lilo map file compaction
  --root  is the root filesystem for the boot floppy; e.g., current
  --version  prints the version number of `basename $0`

Used without any arguments, `basename $0` will use the running kernel booted
by lilo, the companion initrd (if any), and the current root filesystem to
make a bootable 1.44M rescue floppy.

EOF
    exit $1
}



lilo=/sbin/lilo
## lilo=$(pwd)/lilo
compact=-c
config=/etc/lilo.conf
device=/dev/fd0
fs=ext2
mount=/tmp/mkrescue-flp
mfile=/tmp/mkrescue-emu
loopback=loop4
install=text
format=yes
root=current
fast=
size=1440
bootcmd=


image=`cat /proc/cmdline | sed "s/.*BOOT_IMAGE=//" | sed "s/ .*//"`

kernel=`$lilo -C $config -I $image i`
if [ "$kernel" = "" ]; then exit 1;
elif [ $debug = "true" ]; then echo kernel = "$kernel";
fi

initrd=`$lilo -C $config -I $image r`
if [ "$initrd" = "" ]; then exit 1;
elif [ $debug = "true" ]; then echo initrd = "$initrd";
fi
if [ "$initrd" = "No initial ramdisk specified" ]; then initrd= ; fi

keymap=`$lilo -C $config -I $image k`
if [ "$keymap" = "" ]; then exit 1;
elif [ $debug = "true" ]; then echo keymap = "$keymap";
fi

root=`mount | grep " on / type" | sed "s/ .*//"`
if [ -z $root ]; then
	echo "Cannot find mounted root partition"
	echo "Using current root"
	root=current
fi


while [ $# -gt 0 ]; do
    case $1 in
	--debug)
	    debug=true
	    ;;
	--device)
	    shift
	    device=$1
	    ;;
	--fast)
	    fast=fast
	    ;;
	--fs)
	    shift
	    fs=$1
	    ;;
	-h)
	    usage 0
	    ;;
	--help)
	    usage 0
	    ;;
	--initrd)
	    shift
	    initrd=$1
	    ;;
	--kernel)
	    shift
	    kernel=$1
	    ;;
	--keymap)
	    shift
	    keymap=$1
	    ;;
	--nocompact)
	    compact=
	    ;;
	--noformat)
	    format=no
	    ;;
	--root)
	    shift
	    root=$1
	    ;;
	--version)
	    echo `basename $0` version $version
	    exit 0
	    ;;
	*)
	    echo "unrecognized argument: " $1
	    usage 1
	    ;;
    esac

    shift
done

if [ $fs != msdos -a $fs != ext2 -a $fs != minix ]; then
    echo "illegal option:  --fs" $fs
    echo "   must be either  msdos  or  ext2  or  minix"
    exit 1
fi

if [ $fs = msdos ]; then
	mountconfig=$mount/lilo.cnf
else
	mountconfig=$mount/lilo.conf
fi

if [ $debug = "true" ]; then
	umount $mfile
	echo lilo = $lilo
	echo device = $device
	echo image = $image
	echo kernel = $kernel
	echo initrd = $initrd
	echo install = $install
	echo format = $format
	echo fs = $fs
	echo root = $root
	echo compact = $compact
	echo keymap = $keymap 
fi

if [ ! -f $kernel ]; then
	echo "Kernel file " $kernel " does not exist"
	exit 1
fi

if [ ! -z $initrd ]; then
	if [ ! -f $initrd ]; then
		echo "Initial ramdisk file " $initrd " does not exist"
		exit 1
	fi
fi

echo ""
echo "Insert a blank floppy into $device"
echo "All information on this floppy will be destroyed"
echo "Press [Enter] to proceed, ^C to abort"
read aline

if [ "$fast" = fast ]; then

	rm -rf $mount $mfile
	mkdir $mount
	dd bs=1024 count=$size of=$mfile if=/dev/zero
	echo Making filesystem
	echo y | mkfs -t $fs $mfile
	echo Mounting filesystem
	mount -t $fs -o loop=/dev/$loopback $mfile $mount
	if [ $debug = true ]; then
		mount
	fi
	disk="/dev/$loopback sectors=18 heads=2 cylinders=80"

else

	if [ "$format" = "yes" ]; then
		echo Formatting $device with $fs filesystem...
		mkfs.$fs $device 1>/dev/null 2>/dev/null
		echo done.
		echo ""
	fi

	rm -rf $mount
	mkdir $mount
	mount -t $fs -o rw $device $mount

	rm -rf $mount/*
	disk=$device

fi

cat > $mountconfig <<EOF
install=$install
boot=$device
map=map
backup=/dev/null
message=message
prompt
timeout=150
geometric
default=linux
disk=$disk bios=0x00
root=$root
read-only
EOF

if [ $keymap != us.ktl ]; then 
	echo "keytable=lang.ktl" >>$mountconfig
fi

echo " " >>$mountconfig
echo "image=linux" >>$mountconfig

if [ ! -z $initrd ]; then
	echo "    initrd=initrd" >>$mountconfig
fi

cat > $mount/message <<EOF

mkrescue version $version floppy will boot in 15 seconds
Use  "boot: linux <options>"  to enter kernel options
The root device is currently configured as  root=$root

EOF
echo `uname --sysname` `uname --release` > $mount/$(uname --release)

sync

if [ $debug = true ]; then
	echo ""
	echo "pause after writing lilo.conf & message ..."
	read aline
fi

echo "Copying files..."
if [ $keymap != us.ktl ]; then 
	cp -pv $keymap $mount/lang.ktl
fi

if [ ! -z $initrd ]; then
	cp -pv $initrd $mount/initrd
fi

cp -pv $kernel $mount/linux
sync

echo "done."
echo ""



log=$(pwd)/mkrescue.log
pushd $mount >/dev/null 2>/dev/null
if [ "$fast" = fast ]; then
	bootcmd="-b /dev/$loopback"
fi

echo Running $lilo ...
if [ $debug = true ]; then
 echo	$lilo -C $mountconfig $compact $bootcmd -v5 ">$log"
	$lilo -C $mountconfig $compact $bootcmd -v5 >$log || fast=error
else
	$lilo -C $mountconfig $compact $bootcmd || fast=error
fi
popd >/dev/null 2>/dev/null
if [ "$fast" = error ]; then
	echo lilo failure.
else
	echo done.
fi
echo ""

umount $mount
rmdir $mount

if [ "$fast" = fast ]; then
	dd if=$mfile of=$device bs=1024
fi

rm -f $mfile

echo "All done."
echo ""
exit 0