[LEDE-DEV] [RFC 2/4] base-files: validate metadata of sysupgrade images

[Felix Fietkau]

Use fwtool to extract it, only require metadata to be present if the
platform sysupgrade script sets REQUIRE_IMAGE_METADATA=1

Image metadata is in JSON format and contains a list of supported
devices, along with version information that could be displayed by a UI
later before the actual upgrade happens.

Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 package/base-files/files/lib/upgrade/fwtool.sh | 40 ++++++++++++++++++++++++++
 package/base-files/files/sbin/sysupgrade       |  3 +-
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 package/base-files/files/lib/upgrade/fwtool.sh

diff --git a/package/base-files/files/lib/upgrade/fwtool.sh b/package/base-files/files/lib/upgrade/fwtool.sh
new file mode 100644
index 0000000..984c173
--- /dev/null
+++ b/package/base-files/files/lib/upgrade/fwtool.sh
@@ -0,0 +1,40 @@
+fwtool_pre_upgrade() {
+	fwtool -q -i /dev/null "$1"
+}
+
+fwtool_check_image() {
+	[ $# -gt 1 ] && return 1
+
+	. /usr/share/libubox/jshn.sh
+
+	if ! fwtool -q -i /tmp/sysupgrade.meta "$1"; then
+		echo "Image metadata not found"
+		[ "$REQUIRE_IMAGE_METADATA" = 1 ] && return 1
+		return 0
+	fi
+
+	json_load "$(cat /tmp/sysupgrade.meta)" || {
+		echo "Invalid image metadata"
+		return 1
+	}
+
+	device="$(cat /tmp/sysinfo/board_name)"
+
+	json_select supported_devices || return 1
+
+	json_get_keys dev_keys
+	for k in $dev_keys; do
+		json_get_var dev "$k"
+		[ "$dev" = "$device" ] && return 0
+	done
+
+	echo "Device $device not supported by this image"
+	echo -n "Supported devices:"
+	for k in $dev_keys; do
+		json_get_var dev "$k"
+		echo -n " $dev"
+	done
+	echo
+
+	return 1
+}
diff --git a/package/base-files/files/sbin/sysupgrade b/package/base-files/files/sbin/sysupgrade
index 2f441f8..c095ca8 100755
--- a/package/base-files/files/sbin/sysupgrade
+++ b/package/base-files/files/sbin/sysupgrade
@@ -128,7 +128,8 @@ add_overlayfiles() {
 }
 
 # hooks
-sysupgrade_image_check="platform_check_image"
+sysupgrade_image_check="fwtool_check_image platform_check_image"
+sysupgrade_pre_upgrade="fwtool_pre_upgrade"
 [ $SAVE_OVERLAY = 0 -o ! -d /overlay/etc ] && \
 	sysupgrade_init_conffiles="add_uci_conffiles" || \
 	sysupgrade_init_conffiles="add_overlayfiles"
-- 
2.10.1