From 91118a9500eec1bededcdb8e2f0058368ca7f8b7 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jow@openwrt.org>
Date: Tue, 7 Sep 2010 22:20:26 +0000
Subject: [PATCH] base-files: add an experimental "-c" flag which tries to
 preserve *all* changed files in /overlay/etc minus some system files

SVN-Revision: 22977
---
 package/base-files/Makefile              |  2 +-
 package/base-files/files/sbin/sysupgrade | 21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/package/base-files/Makefile b/package/base-files/Makefile
index 00a9b354ea..bdaf53c771 100644
--- a/package/base-files/Makefile
+++ b/package/base-files/Makefile
@@ -10,7 +10,7 @@ include $(TOPDIR)/rules.mk
 include $(INCLUDE_DIR)/kernel.mk
 
 PKG_NAME:=base-files
-PKG_RELEASE:=52
+PKG_RELEASE:=54
 
 PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/
 PKG_BUILD_DEPENDS:=opkg/host
diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 0cf51cfb78..0fb07530e4 100755
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -7,8 +7,10 @@ RAMFS_COPY_DATA=""	# extra data files
 export INTERACTIVE=0
 export VERBOSE=1
 export SAVE_CONFIG=1
+export SAVE_OVERLAY=0
 export DELAY=
 export CONF_IMAGE=
+
 # parse options
 while [ -n "$1" ]; do 
 	case "$1" in
@@ -17,6 +19,7 @@ while [ -n "$1" ]; do
 		-v) export VERBOSE="$(($VERBOSE + 1))";;
 		-q) export VERBOSE="$(($VERBOSE - 1))";;
 		-n) export SAVE_CONFIG=0;;
+		-c) export SAVE_OVERLAY=1;;
 		-f) export CONF_IMAGE="$2"; shift;;
 		-*)
 			echo "Invalid option: $1"
@@ -41,7 +44,8 @@ Options:
 	-d <delay>   add a delay before rebooting
 	-f <config>  restore configuration from .tar.gz (file or url)
 	-i           interactive mode
-	-n	     do not save configuration over reflash
+	-c           attempt to preserve all changed files in /etc/
+	-n           do not save configuration over reflash
 	-q           less verbose
 	-v           more verbose
 
@@ -56,9 +60,22 @@ add_uci_conffiles() {
 	return 0
 }
 
+add_overlayfiles() {
+	local file="$1"
+	find /overlay/etc/ -type f | sed \
+		-e 's,^/overlay/,/,' \
+		-e '\,/META_[a-zA-Z0-9]*$,d' \
+		-e '\,/functions.sh$,d' \
+		-e '\,/[^/]*-opkg$,d' \
+	> "$file"
+	return 0
+}
+
 # hooks
 sysupgrade_image_check="platform_check_image"
-sysupgrade_init_conffiles="add_uci_conffiles"
+[ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \
+	sysupgrade_init_conffiles="add_uci_conffiles" || \
+	sysupgrade_init_conffiles="add_overlayfiles"
 
 include /lib/upgrade