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https://github.com/fspc/gbootroot.git
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181 lines
4.0 KiB
Bash
Executable File
181 lines
4.0 KiB
Bash
Executable File
#!/bin/bash -x
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# $Id$
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##############################################################################
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##
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##
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## Copyright (C) 2002 by Jonathan Rosenbaum
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## <freesource@users.sourceforge.net>
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##
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## GNU General Public License
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##
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##############################################################################
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# initrd using mtdram or blkmtd: This is most useful for jffs/jffs2
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# filesystems.
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# Find all the necessary details from /proc/cmdline
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# Parse for runlevel, too, both from cmdline and inittab if it exists.
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# This assumes init= isn't being used, otherwise use this instead.
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PATH=/mnt/sbin:/mnt/usr/sbin:/mnt/bin:/mnt/usr/bin:/sbin:/usr/sbin:/bin:/usr/bin:$PATH:.
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mount -t proc none /proc
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# All filesystems made with cramfs/jffs/jffs2 will need the /dev and /initrd
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# directories automatically added.
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MTD_TYPE=`cat /proc/cmdline | cut -d= -f2 | cut -d, -f1`
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FS_TYPE=`cat /proc/cmdline | cut -d= -f2 | cut -d, -f2`
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TOTAL_SIZE=`cat /proc/cmdline | cut -d= -f2 | cut -d, -f3`
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ERASURE_SIZE=`cat /proc/cmdline | cut -d= -f2 | cut -d, -f4`
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INIT=`cat /proc/cmdline | cut -d= -f2 | cut -d, -f5`
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FILE_PATH=`cat /proc/cmdline | sed s/.*ubd[0-9][a-z]\\\?=// | cut -d" " -f1`
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FILE_USER=${FILE_PATH%/*}
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FILE_DD=${FILE_PATH##/*/}
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FILE=${FILE_DD/_dd/}
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UBD_NUMBER=` cat /proc/cmdline | sed s/.*ubd// | sed s/[^0-9].*//`
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CHROOT=/mnt/usr/sbin/chroot
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# devfs or not?
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if [ `cat /proc/cmdline | sed s/.*devfs=// | cut -d" " -f1` = nomount ]
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then
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MTD=/dev/mtd0
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MTDBLOCK=/dev/mtdblock0
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UBD=/dev/ubd$UBD_NUMBER
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DEVFS=nomount
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else
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MTD=/dev/mtd/0
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MTDBLOCK=/dev/mtdblock/0
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UBD=/dev/ubd/$UBD_NUMBER
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DEVFS=mount
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fi
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###############
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# MTDRAM
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###############
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# There are total_size=$TOTAL_SIZE erase_size=$ERASURE_SIZE
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# options, see http://www.iptel-now.de/HOWTO/MTD/mtd.html
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# Auto-determine total_size if user doesn't as well as mem option to kernel.
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# Need to know which filesystem, and type
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if [ $MTD_TYPE = mtdram ]
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then
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if [ $ERASURE_SIZE ]
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then
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insmod mtdram.o -o mtdram$UBD_NUMBER total_size=$TOTAL_SIZE erase_size=$ERASURE_SIZE
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dd if=$UBD of=$MTD
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mount -t $FS_TYPE $MTDBLOCK /mnt
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else
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insmod mtdram.o -o mtdram$UBD_NUMBER total_size=$TOTAL_SIZE
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dd if=$UBD of=$MTD
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mount -t $FS_TYPE $MTDBLOCK /mnt
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fi
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fi
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##############
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# BLKMTD
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##############
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# ubd/0 is going to be a dd copy, and a larger size than the real image
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# by default, but the user can specify a different size.
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# dd if=root_fs_jffs2 of=root_fs_jffs2_dd
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# and it will be mysteriously replaced for the real ubd/0 specified by the
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# user .. the fs with dd appended when blkmtd is chosen.
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if [ $MTD_TYPE = blkmtd ]
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then
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insmod blkmtd.o -o blkmtd$UBD_NUMBER device=$UBD
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if [ $ERASURE_SIZE ]
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then
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erase $MTD 0 $ERASURE_SIZE
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else
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erase $MTD 0 0x20000
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fi
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mount -t hostfs none -o $FILE_USER /mnt
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dd if=/mnt/$FILE of=$MTD
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umount /mnt
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mount -t $FS_TYPE $MTDBLOCK /mnt
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fi
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#########################
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# RUNLEVEL or MTD_INIT
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#########################
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if [ ! $INIT ]
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then
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if [ -e /mnt/etc/inittab ]
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then
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INIT="sbin/init $(grep initdefault /mnt/etc/inittab | cut -d: -f2)"
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else
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INIT="sbin/init 2"
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fi
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fi
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###############
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# PIVOT_ROOT
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###############
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cd /mnt
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# Check if directory already exists .. cramfs/jffs/jffs2 better have this.
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# This is done automatically by gbootroot, but it is good to check.
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if [ ! -d /mnt/initrd ]
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then
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/sbin/mkdir /mnt/initrd
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fi
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if [ ! -d /mnt/dev -a ! -L /mnt/dev ]
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then
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/sbin/mkdir /mnt/dev
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fi
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# For pivot_root to work chroot needs to be on the root filesystem
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if [ ! -f $CHROOT ]
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then
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CHROOT=`which chroot | sed s,/mnt,,`
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if [ $CHROOT = /usr/sbin/chroot ]
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then
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echo "ERROR: Can't find chroot, add it to the root filesystem."
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echo " Staying in the initrd. :-)"
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/bin/bash
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fi
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else
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CHROOT=/usr/sbin/chroot
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fi
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if [ $DEVFS = mount ]
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then
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mount -t devfs none /mnt/dev
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fi
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pivot_root . initrd
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cd /
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# User may have to supply init level or type of init, and there is mtd_init
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# option to the kernel.
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exec $CHROOT . $INIT <dev/console >dev/console 2>&1
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