initrd linuxrc

linuxrc (text/plain), 3.11 KB, created by Alon Bar-Lev (RETIRED) on 2005-06-11 12:40:24 UTC

#!/bin/sh
#
# History
# -----------------
# 2005.06.07 - Alon Bar-Lev
#	Writeen.
#

#
# make ramdisk read/write
#
mount -o remount,rw /

#
# create devices missing
# from /dev
# I don't use udev here
#
mknod /dev/hda1 b 3 1
mknod /dev/hda2 b 3 2
mknod /dev/hda3 b 3 3
mknod /dev/hda4 b 3 4
mknod /dev/hdb1 b 3 65
mknod /dev/hdb2 b 3 66
mknod /dev/hdb3 b 3 67
mknod /dev/hdb4 b 3 68
mknod /dev/hdc1 b 22 1
mknod /dev/hdc2 b 22 2
mknod /dev/hdc3 b 22 3
mknod /dev/hdc4 b 22 4
mknod /dev/hdd1 b 22 65
mknod /dev/hdd2 b 22 66
mknod /dev/hdd3 b 22 67
mknod /dev/hdd4 b 22 68
# these required for splash
mknod /dev/fbsplash c 10 62
mknod /dev/fb0 c 29 0
mkdir /dev/vc
mknod /dev/vc/0 c 4 0

#
# mount proc
#
mount -t proc none /proc

#
# set kernel
#
kernel=`uname -r`

#
# parse command line
#
CMDLINE=`cat /proc/cmdline`
for x in ${CMDLINE}; do
	case "${x}" in
		initrd_util=*)
			myutil=${x#initrd_util=}
		;;
		initrd_loops=*)
			myloops=${x#initrd_loops=}
		;;
		initrd_loopstart=*)
			myloopstart=${x#initrd_loopstart=}
		;;
		initrd_shell=*)
			myshell=${x#initrd_shell=}
		;;
		splash=*)
			theme=${x#*:}
		;;
		root=*)
			root=${x#*=}
		;;
	esac
done

if [ "$myloopstart" = "" ]; then
	myloopstart=0
fi

if [ "$myshell" = "1" ]; then
	/bin/sh
	exit
fi

#
# mount boot file system
#
if [ "$myutil" = "" ]; then
	echo Please specify myutil kernel parameter at next reboot.
	/bin/sh
	exit
fi

if [ ! -d /mnt ]; then
	mkdir /mnt
fi
mount -t ext2 -o ro $myutil /mnt

#
# set new path
#
oldpath=$PATH
export PATH=$PATH:/mnt/boot-util/${kernel}/bin

#
# setup file environment
# gpg MUST be in /bin/gpg (not searched in path)
#
ln /bin/busybox /bin/stty
mkdir -p /lib/modules/${kernel}/block
cp -a /mnt/boot-util/${kernel}/lib/modules/${kernel}/block/loop.* /lib/modules/${kernel}/block
ln -s /mnt/boot-util/${kernel}/bin/gpg.static /bin/gpg
ln -s /mnt/boot-util/${kernel}/etc-/splash /etc/splash

if [ "$myshell" = "2" ]; then
	/bin/sh
	exit
fi

#
# load loop-aes
#
modprobe loop

#
# suspend splash
#
if [ "$theme" != "" ]; then
	splash_util -c setmode -m v
fi

#
# setup loop devices
#
if [ "$myloops" != "" ]; then
	while ! losetup.q /dev/loop$myloopstart > /dev/null 2>&1; do
		# prompt for password
		stty -echo
		echo -n "Password: "
		read -r pin
		stty echo
		# for new line...
		echo

		#
		# map loop devices
		#
		index=$myloopstart
		for x in `echo $myloops | sed "s/,/ /g"`; do
			echo "$pin" | losetup.q -p 0 -e AES256 -K /mnt/keyfile.gpg -G / /dev/loop$index $x 
			index=$(($index+1))
		done
	done
fi

#
# resume splash
#
if [ "$theme" != "" ]; then
	splash_util -c setmode -m s;splash_util -c repaint -m s --theme=$theme
fi

#
# clear variables
# not sure if it works...
# but worth a try...
#
pin=*****************
unset pin
export PATH=$oldpath
unset oldpath

#
# unmount file systems
#
umount /mnt
mount -o remount,ro /

if [ "$myshell" = "3" ]; then
	/bin/sh
	exit
fi

#
# try to resume
#
echo > /proc/software_suspend/do_resume

#
# tell kernel to boot from
# a loop device
#
if [ "${root#/dev/loop}" != "${root}" ]; then
	loop=${root#/dev/loop}
	echo 0x70$loop > /proc/sys/kernel/real-root-dev
fi

#
# unmount file systems
#
umount /proc

#
# pass control to root
#