| 1 | #!/bin/sh
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| 2 | is_dirty() {
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| 3 | grep Broadcom /proc/cpuinfo >&- || return 1
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| 4 | OFFSET="$(($(hexdump -v /dev/mtdblock/1 -s 20 -n 2 -e '"%d"')-1))"
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| 5 | return $(hexdump -v /dev/mtdblock/1 -s $OFFSET -n 1 -e '"%d"')
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| 6 | }
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| 7 |
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| 8 | pivot() { # <new_root> <old_root>
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| 9 | mount -o move /proc $1/proc && \
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| 10 | pivot_root $1 $1$2 && {
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| 11 | mount -o move $2/dev /dev
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| 12 | mount -o move $2/tmp /tmp
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| 13 | return 0
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| 14 | }
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| 15 | }
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| 16 |
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| 17 | dupe() { # <new_root> <old_root>
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| 18 | cd $1
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| 19 | echo -n "creating directories... "
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| 20 | {
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| 21 | cd $2
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| 22 | find . -xdev -type d
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| 23 | echo "./dev ./jffs ./mnt ./proc ./tmp"
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| 24 | # xdev skips mounted directories
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| 25 | cd $1
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| 26 | } | xargs mkdir -p
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| 27 | echo "done"
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| 28 |
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| 29 | echo -n "setting up symlinks... "
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| 30 | for file in $(cd $2; find . -xdev -type f;); do
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| 31 | case "$file" in
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| 32 | ./rom/note) ;; #nothing
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| 33 | ./etc/resolv.conf|\
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| 34 | ./usr/lib/ipkg/info) cp -af $2/$file $file;;
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| 35 | *) ln -sf /rom/${file#./*} $file;;
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| 36 | esac
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| 37 | done
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| 38 | for file in $(cd $2; find . -xdev -type l;); do
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| 39 | cp -af $2/${file#./*} $file
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| 40 | done
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| 41 | echo "done"
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| 42 | }
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| 43 |
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| 44 | mountdp() { # <device> <mount_point> <ignored> <fs>
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| 45 | dev=$1; mnt=$2; shift 2; opt=$*
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| 46 | mount $dev $mnt $opt
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| 47 | dupe $mnt $rom
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| 48 | pivot $mnt /rom
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| 49 | }
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| 50 |
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| 51 | size=$(awk '/Mem:/ {l=5242880;print((s=$2/2)<l)?$2-l:s}' /proc/meminfo)
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| 52 | mount none /tmp -t tmpfs -o size=$size
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| 53 |
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| 54 | mtd unlock linux
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| 55 | is_dirty
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| 56 | [ $? != 0 ] && {
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| 57 | echo "switching to overlay filesystem"
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| 58 | datanr=$(awk -F : '/data/ { print $1 }' /proc/mtd |sed "s#mtd##")
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| 59 | mount /dev/mtdblock/$datanr /jffs -t jffs2
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| 60 | mount -t mini_fo -o base=/,sto=/jffs /jffs /mnt
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| 61 | pivot /mnt /rom
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| 62 | } || {
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| 63 | echo "jffs2 unusable; using ramdisk"
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| 64 | mkdir -p /tmp/root
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| 65 | mountdp /tmp/root /mnt -o bind
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| 66 | }
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| 67 |
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| 68 | mount none /tmp -t tmpfs -o remount,nosuid,nodev,mode=1777
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| 69 | mkdir -p /dev/pts
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| 70 | mount none /dev/pts -t devpts
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