From 189637c96488e253c782ce0b9fd7f4a30c645df1 Mon Sep 17 00:00:00 2001
From: Chuanhong Guo <gch981213@gmail.com>
Date: Sun, 11 Dec 2022 19:56:13 +0800
Subject: [PATCH] base-files: sysupgrade-tar: allow separated kernel/rootfs ubi

There are some devices putting kernel and rootfs on separated
ubi volumes. To make OpenWrt compatible with their bootloader,
we need to put kernel and rootfs into separated ubi volumes.
Add support for CI_KERN_UBIPART and CI_ROOT_UBIPART for this
situation.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
---
 package/base-files/files/lib/upgrade/nand.sh | 41 +++++++++++++-------
 1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/package/base-files/files/lib/upgrade/nand.sh b/package/base-files/files/lib/upgrade/nand.sh
index 258483fbf45..a8e3cab0b8b 100644
--- a/package/base-files/files/lib/upgrade/nand.sh
+++ b/package/base-files/files/lib/upgrade/nand.sh
@@ -7,6 +7,8 @@
 CI_KERNPART="${CI_KERNPART:-kernel}"
 
 # 'ubi' partition on NAND contains UBI
+# There are also CI_KERN_UBIPART and CI_ROOT_UBIPART if kernel
+# and rootfs are on separated UBIs.
 CI_UBIPART="${CI_UBIPART:-ubi}"
 
 # 'rootfs' UBI volume on NAND contains the rootfs
@@ -104,7 +106,7 @@ identify_if_gzip() {
 }
 
 nand_restore_config() {
-	local ubidev=$( nand_find_ubi "$CI_UBIPART" )
+	local ubidev=$( nand_find_ubi "${CI_ROOT_UBIPART:-$CI_UBIPART}" )
 	local ubivol="$( nand_find_volume $ubidev rootfs_data )"
 	if [ ! "$ubivol" ]; then
 		ubivol="$( nand_find_volume $ubidev "$CI_ROOTPART" )"
@@ -213,15 +215,25 @@ nand_upgrade_prepare_ubi() {
 
 	local kernel_length="$3"
 	local has_env="${4:-0}"
+	local kern_ubidev
+	local root_ubidev
 
 	[ -n "$rootfs_length" -o -n "$kernel_length" ] || return 1
 
-	local ubidev="$( nand_attach_ubi "$CI_UBIPART" "$has_env" )"
-	[ -n "$ubidev" ] || return 1
+	if [ -n "$CI_KERN_UBIPART" -a -n "$CI_ROOT_UBIPART" ]; then
+		kern_ubidev="$( nand_attach_ubi "$CI_KERN_UBIPART" "$has_env" )"
+		[ -n "$kern_ubidev" ] || return 1
+		root_ubidev="$( nand_attach_ubi "$CI_ROOT_UBIPART" )"
+		[ -n "$root_ubidev" ] || return 1
+	else
+		kern_ubidev="$( nand_attach_ubi "$CI_UBIPART" "$has_env" )"
+		[ -n "$kern_ubidev" ] || return 1
+		root_ubidev="$kern_ubidev"
+	fi
 
-	local kern_ubivol="$( nand_find_volume $ubidev "$CI_KERNPART" )"
-	local root_ubivol="$( nand_find_volume $ubidev "$CI_ROOTPART" )"
-	local data_ubivol="$( nand_find_volume $ubidev rootfs_data )"
+	local kern_ubivol="$( nand_find_volume $kern_ubidev "$CI_KERNPART" )"
+	local root_ubivol="$( nand_find_volume $root_ubidev "$CI_ROOTPART" )"
+	local data_ubivol="$( nand_find_volume $root_ubidev rootfs_data )"
 	[ "$root_ubivol" = "$kern_ubivol" ] && root_ubivol=
 
 	# remove ubiblocks
@@ -230,13 +242,13 @@ nand_upgrade_prepare_ubi() {
 	[ "$data_ubivol" ] && { nand_remove_ubiblock $data_ubivol || return 1; }
 
 	# kill volumes
-	[ "$kern_ubivol" ] && ubirmvol /dev/$ubidev -N "$CI_KERNPART" || :
-	[ "$root_ubivol" ] && ubirmvol /dev/$ubidev -N "$CI_ROOTPART" || :
-	[ "$data_ubivol" ] && ubirmvol /dev/$ubidev -N rootfs_data || :
+	[ "$kern_ubivol" ] && ubirmvol /dev/$kern_ubidev -N "$CI_KERNPART" || :
+	[ "$root_ubivol" ] && ubirmvol /dev/$root_ubidev -N "$CI_ROOTPART" || :
+	[ "$data_ubivol" ] && ubirmvol /dev/$root_ubidev -N rootfs_data || :
 
 	# create kernel vol
 	if [ -n "$kernel_length" ]; then
-		if ! ubimkvol /dev/$ubidev -N "$CI_KERNPART" -s $kernel_length; then
+		if ! ubimkvol /dev/$kern_ubidev -N "$CI_KERNPART" -s $kernel_length; then
 			echo "cannot create kernel volume"
 			return 1;
 		fi
@@ -250,7 +262,7 @@ nand_upgrade_prepare_ubi() {
 		else
 			rootfs_size_param="-s $rootfs_length"
 		fi
-		if ! ubimkvol /dev/$ubidev -N "$CI_ROOTPART" $rootfs_size_param; then
+		if ! ubimkvol /dev/$root_ubidev -N "$CI_ROOTPART" $rootfs_size_param; then
 			echo "cannot create rootfs volume"
 			return 1;
 		fi
@@ -262,8 +274,8 @@ nand_upgrade_prepare_ubi() {
 		if [ -n "$rootfs_data_max" ]; then
 			rootfs_data_size_param="-s $rootfs_data_max"
 		fi
-		if ! ubimkvol /dev/$ubidev -N rootfs_data $rootfs_data_size_param; then
-			if ! ubimkvol /dev/$ubidev -N rootfs_data -m; then
+		if ! ubimkvol /dev/$root_ubidev -N rootfs_data $rootfs_data_size_param; then
+			if ! ubimkvol /dev/$root_ubidev -N rootfs_data -m; then
 				echo "cannot initialize rootfs_data volume"
 				return 1
 			fi
@@ -347,8 +359,8 @@ nand_upgrade_tar() {
 	local has_env=0
 	nand_upgrade_prepare_ubi "$rootfs_length" "$rootfs_type" "$ubi_kernel_length" "$has_env" || return 1
 
-	local ubidev="$( nand_find_ubi "$CI_UBIPART" )"
 	if [ "$rootfs_length" ]; then
+		local ubidev="$( nand_find_ubi "${CI_ROOT_UBIPART:-$CI_UBIPART}" )"
 		local root_ubivol="$( nand_find_volume $ubidev "$CI_ROOTPART" )"
 		tar xO${gz}f "$tar_file" "$board_dir/root" | \
 			ubiupdatevol /dev/$root_ubivol -s "$rootfs_length" -
@@ -358,6 +370,7 @@ nand_upgrade_tar() {
 			tar xO${gz}f "$tar_file" "$board_dir/kernel" | \
 				mtd write - "$CI_KERNPART"
 		else
+			local ubidev="$( nand_find_ubi "${CI_KERN_UBIPART:-$CI_UBIPART}" )"
 			local kern_ubivol="$( nand_find_volume $ubidev "$CI_KERNPART" )"
 			tar xO${gz}f "$tar_file" "$board_dir/kernel" | \
 				ubiupdatevol /dev/$kern_ubivol -s "$kernel_length" -
-- 
2.30.2