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