[package] block-extroot: Merged 24230 from trunk: Added an md5sum to extroot and...

[openwrt-10.03/.git] / package / block-extroot / files / 55_determine_extroot_sysupgrade

diff --git a/package/block-extroot/files/55_determine_extroot_sysupgrade b/package/block-extroot/files/55_determine_extroot_sysupgrade
new file mode 100644 (file)
index 0000000..21af8b0
--- /dev/null
+++ b/package/block-extroot/files/55_determine_extroot_sysupgrade
@@ -0,0 +1,55 @@
+#!/bin/sh
+# Copyright (C) 2010 Daniel Dickinson
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+
+
+check_set_md5sum() {
+       local er_md5sum_file
+       er_md5sum_file="${ER_OVERLAY_PREFIX}/.extroot.md5sum"
+
+       local er_extroot_md5sum
+       if [ -f $md5sum_file ]; then
+               er_extroot_md5sum="$(cat $er_md5sum_file)"
+       fi
+
+       local er_extroot_overlay_md5sum
+       if [ -f "/overlay/etc/extroot.md5sum" ]; then
+               er_extroot_overlay_md5sum="$(cat /overlay/.extroot.md5sum)"
+       fi
+
+       if [ -z "$er_extroot_overlay_md5sum" ]; then
+               cat $er_md5sum_file >/overlay/.extroot.md5sum
+       elif [ "$er_extroot_overlay_md5sum" != "$er_extroot_md5sum" ]; then
+               pi_extroot_mount_success="false"
+               mkdir -p /tmp/overlay-disabled
+               mount --move /overlay /tmp/overlay-disabled
+       fi
+}
+
+set_jffs_md5sum() {
+       # We do this anytime block-extroot exists, even on the first boot with
+       # no extroot defined.
+
+       local er_md5sum_file
+       er_md5sum_file="${ER_OVERLAY_PREFIX}/.extroot.md5sum"
+
+       local er_extroot_md5sum
+       if [ -f $er_md5sum_file ]; then
+               er_extroot_md5sum="$(cat $er_md5sum_file)"
+       fi
+       if [ -z "$er_extroot_md5sum" ]; then
+               dd if=/dev/urandom count=32 bs=1k 2>/dev/null | md5sum | cut -f1 -d\  >$er_md5sum_file
+       fi
+}
+
+determine_extroot_sysupgrade() {
+       check_skip || set_jffs_md5sum
+
+       check_skip || [ "$pi_extroot_mount_success" != "true" ] || {
+               check_set_md5sum
+       }
+}
+
+boot_hook_add preinit_mount_root determine_extroot_sysupgrade
+