fixes #207

[openwrt.git] / openwrt / package / base-files / default / sbin / mount_root

diff --git a/openwrt/package/base-files/default/sbin/mount_root b/openwrt/package/base-files/default/sbin/mount_root
index b4ec2ca..e855b41 100755 (executable)
--- a/openwrt/package/base-files/default/sbin/mount_root
+++ b/openwrt/package/base-files/default/sbin/mount_root
@@ -1,4 +1,11 @@
 #!/bin/sh
+. /etc/nvram.sh
+is_clean() {
+       grep Broadcom /proc/cpuinfo 2>&- >&- || return 0
+       OFFSET="$((0x$(dd if=/dev/mtdblock/1 bs=1 skip=$((0x14)) count=2 2>&- | hexdump | grep 0000000 | cut -d ' ' -f 2) - 1))"
+       dd if=/dev/mtdblock/1 bs=1 skip=$OFFSET count=1 2>&- | hexdump -v | grep ' 0000' > /dev/null && return 255 || return 0
+}
+
 if [ "$1" != "failsafe" ]; then 
        mount | grep jffs2 >&-
        if [ $? = 0 ] ; then
@@ -12,12 +19,19 @@ if [ "$1" != "failsafe" ]; then
                        mount -o remount,rw /dev/root /
                fi
        else
-               mtd unlock OpenWrt
-               mount -t jffs2 /dev/mtdblock/4 /jffs
-               pivot_root /jffs /jffs/rom
-               mount none /proc -t proc
-               mount none /dev -t devfs
-               umount /rom/proc rom/dev >&-
+               if [ -z "$(nvram get no_root_swap)" ]; then
+                       is_clean || {
+                               mtd erase OpenWrt
+                               mtd unlock linux
+                               jffs2root --clean
+                       }
+                       mtd unlock OpenWrt
+                       mount -t jffs2 /dev/mtdblock/4 /jffs
+                       pivot_root /jffs /jffs/rom
+                       mount none /proc -t proc
+                       mount none /dev -t devfs
+                       umount /rom/proc rom/dev >&-
+               fi
        fi
 fi
 mount none /tmp -t tmpfs -o nosuid,nodev,mode=1777,size=50%