x86_64: support sysupgrade config restore on PARTUUID mounted disks

Fix the move_config() procedure to properly find the corresponding disk if
the rootfs was mounted by PARTUUID instead of a device node.

Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>
SVN-Revision: 42946

diff --git a/target/linux/x86_64/base-files/lib/preinit/79_move_config b/target/linux/x86_64/base-files/lib/preinit/79_move_config
index 0bffbab994befdd9ec7b81f24b9a2cdf2e6ec1b3..ca9c2a9b5e5948cf9976f95cc89333f0671c1f1b 100644 (file)
--- a/target/linux/x86_64/base-files/lib/preinit/79_move_config
+++ b/target/linux/x86_64/base-files/lib/preinit/79_move_config
@@ -1,21 +1,44 @@
 #!/bin/sh
-# Copyright (C) 2012 OpenWrt.org
+# Copyright (C) 2012-2014 OpenWrt.org
 
 move_config() {
-       local rootfsdev
-       local rootfstype
-       
-       rootfstype="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "rootfstype") { print $2 }' < /proc/cmdline)"
-       case "$rootfstype" in
-               squashfs|jffs2)
-                       rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "block2mtd.block2mtd") { print substr($2,1,index($2, ",")-1) }' < /proc/cmdline)";;
-               ext4)
-                       rootfsdev="$(awk 'BEGIN { RS=" "; FS="="; } ($1 == "root") { print $2 }' < /proc/cmdline)";;
-       esac
+       local cmdline uuid disk dev
 
-       mount -t ext4 -o rw,noatime "${rootfsdev%[0-9]}1" /mnt
-       mv -f /mnt/sysupgrade.tgz /
-       umount /mnt
+       if read cmdline < /proc/cmdline; then
+               case "$cmdline" in
+                       *block2mtd=*)
+                               disk="${cmdline##*block2mtd=}"
+                               disk="${disk%%,*}"
+                       ;;
+                       *root=*)
+                               disk="${cmdline##*root=}"
+                               disk="${disk%% *}"
+                       ;;
+               esac
+
+               case "$disk" in
+                       PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02)
+                               uuid="${cmdline#PARTUUID=}"
+                               uuid="${uuid%-02}"
+                               for disk in /dev/sd[a-z]; do
+                                       set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "')
+                                       if [ "$4$3$2$1" = "$uuid" ]; then
+                                               dev="${disk}1"
+                                               break
+                                       fi
+                               done
+                       ;;
+                       /dev/*)
+                               dev="${disk%[0-9]}1"
+                       ;;
+               esac
+       fi
+
+       if [ -n "$dev" ]; then
+               mount -t ext4 -o rw,noatime "$dev" /mnt
+               mv -f /mnt/sysupgrade.tgz /
+               umount /mnt
+       fi
 }
 
 boot_hook_add preinit_mount_root move_config