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#!/bin/sh
. /etc/functions.sh
partname="rootfs_data"
mtdpart="$(find_mtd_part $partname)"
rom=$(awk '/squashfs/ {print $2}' /proc/mounts)
jffs=$(awk '/jffs2/ {print $2}' /proc/mounts)
dupe() { # <new_root> <old_root>
cd $1
echo -n "creating directories... "
{
cd $2
find . -xdev -type d
echo "./dev ./jffs ./mnt ./proc ./tmp"
# xdev skips mounted directories
cd $1
} | xargs mkdir -p
echo "done"
echo -n "setting up symlinks... "
for file in $(cd $2; find . -xdev -type f;); do
case "$file" in
./rom/note) ;; #nothing
./etc/config*|\
./usr/lib/opkg/info/*) cp -af $2/$file $file;;
*) ln -sf /rom/${file#./*} $file;;
esac
done
for file in $(cd $2; find . -xdev -type l;); do
cp -af $2/${file#./*} $file
done
echo "done"
}
pivot() { # <new_root> <old_root>
mount -o move /proc $1/proc && \
pivot_root $1 $1$2 && {
mount -o move $2/dev /dev
mount -o move $2/tmp /tmp
mount -o move $2/sys /sys 2>&-
mount -o move $2/jffs /jffs 2>&-
return 0
}
}
fopivot() { # <rw_root> <ro_root> <dupe?>
root=$1
{
if grep -q mini_fo /proc/filesystems; then
mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
else
mount --bind / /mnt
mount --bind -o union "$1" /mnt && root=/mnt
fi
} || {
[ "$3" = "1" ] && {
mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
dupe $1 $rom
}
}
pivot $root $2
}
ramoverlay() {
mkdir -p /tmp/root
mount -t tmpfs root /tmp/root
fopivot /tmp/root /rom 1
}
# invoked as an executable
[ "${0##*/}" = "firstboot" ] && {
[ -z "$mtdpart" ] && {
echo "MTD partition not found."
exit 1
}
[ -z "$rom" ] && {
echo "You do not have a squashfs partition; aborting"
echo "(firstboot cannot be run on jffs2 based firmwares)"
exit 1
}
[ "$1" = "switch2jffs" ] && {
if grep -q mini_fo /proc/filesystems; then
mount "$mtdpart" /rom/jffs -t jffs2 || exit
# try to avoid fs changing while copying
mount -o remount,ro none / 2>&-
# copy ramoverlay to jffs2
echo -n "copying files ... "
cp -a /tmp/root/* /rom/jffs 2>&-
echo "done"
# switch back to squashfs (temporarily)
# and park the ramdisk ontop of /tmp/root
pivot /rom /mnt
mount -o move /mnt /tmp/root
# /jffs is the overlay
# /rom is the readonly
fopivot /jffs /rom
# try to get rid of /tmp/root
# this will almost always fail
umount /tmp/root 2>&-
else
# switch back to squashfs temporarily
pivot /rom /mnt
# get rid of the old overlay
umount -l /mnt
# another umount to get rid of the bind from /tmp/root
umount -l /mnt
# initialize jffs2
mount "$mtdpart" /jffs -t jffs2 || exit
# workaround to ensure that union can attach properly
sync
ls /jffs >/dev/null
# switch to the new (empty) jffs2
fopivot /jffs /rom 1
# copy ramoverlay to jffs2, must be done after switching
# to the new rootfs to avoid creating opaque directories
echo -n "copying files ... "
cp -a /tmp/root/* / >/dev/null 2>&1
sync
echo "done"
umount -l /jffs
umount -l /tmp/root
fi
exit 0
}
# script run manually
[ \! -z "$jffs" ] && {
echo "firstboot has already been run"
echo "jffs2 partition is mounted, only resetting files"
grep mini_fo /proc/filesystems >&-
[ $? != 0 ] && {
dupe $jffs $rom
exit 0
} || {
rm -rf $jffs/* 2>&-
mount -o remount $jffs / 2>&-
exit 0
}
}
mtd erase "$partname"
mount "$mtdpart" /jffs -t jffs2
fopivot /jffs /rom 1
}
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