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-rw-r--r--package/block-mount/files/55_determine_extroot_sysupgrade63
1 files changed, 63 insertions, 0 deletions
diff --git a/package/block-mount/files/55_determine_extroot_sysupgrade b/package/block-mount/files/55_determine_extroot_sysupgrade
new file mode 100644
index 000000000..b0cd9036c
--- /dev/null
+++ b/package/block-mount/files/55_determine_extroot_sysupgrade
@@ -0,0 +1,63 @@
+#!/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="${ER_OVERLAY_PREFIX}/.extroot.md5sum"
+ local er_disabled
+ if [ "${ER_OVERLAY_ROM}" = "/rom" ]; then
+ er_disabled=/tmp/whole_root-disabled
+ else
+ er_disabled=/tmp${ER_OVERLAY_ROM}-disabled
+ fi
+
+ local er_extroot_md5sum
+ if [ -f $md5sum_file ]; then
+ er_extroot_md5sum="$(cat $er_md5sum_file)"
+ fi
+
+ local er_overlay_file="${ER_OVERLAY_ROM}/etc/extroot.md5sum"
+
+ local er_extroot_overlay_md5sum
+ if [ -f "$er_overlay_file" ]; then
+ er_extroot_overlay_md5sum="$(cat $er_overlay_file)"
+ fi
+
+ if [ -z "$er_extroot_overlay_md5sum" ]; then
+ cat $er_md5sum_file >$er_overlay_file
+ elif [ "$er_extroot_overlay_md5sum" != "$er_extroot_md5sum" ]; then
+ pi_extroot_mount_success="false"
+ mkdir -p $er_disabled
+ mount --move ${ER_OVERLAY_ROM} $er_disabled
+ fi
+}
+
+set_jffs_md5sum() {
+ # We do this anytime block-extroot exists, even on the first boot with
+ # no extroot defined.
+
+ local er_md5sum_file
+ er_md5sum_file="${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
+