package: basefiles: add oem image dectection to fwtool.sh

with more new device, now able to flash oem
images from luci, fwtools erroneously marks
firmware as incompatible and does not warn
across keeping configs during update.

this patch aims to add both oem detection
and a warning msg advising firmware is compatible
(OpenWrt -> OEM) but configuration is not

tested on ipq5018: gl-b3000

Signed-off-by: Scott Mercer <[email protected]>

package: basefiles: add oem image dectection to fwtool

    some new devices are now able to flash oem
    images from luci, fwtools erroneously marks
    firmware as incompatible and does not warn
    of keeping configs during update for this condition.

    this patch aims to add both oem detection
    and trigger the existing warning msg, advising firmware is compatible
    (OpenWrt -> OEM) but configuration is not

tested on ipq5018: gl-b3000

Signed-off-by: Scott Mercer <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/18554
Signed-off-by: Robert Marko <[email protected]>

package/base-files/files/lib/upgrade/fwtool.sh

@@ -42,7 +42,9 @@ fwtool_check_image() {
 		v "Invalid image metadata"
 		return 1
 	}
-
+	# Step 1. check if oem_name file exist and is not empty
+	# If the above is true store the contents (b3000) in $oem value for later
+	[ -s /tmp/sysinfo/oem_name ] && oem="$(cat /tmp/sysinfo/oem_name)"
 	device="$(cat /tmp/sysinfo/board_name)"
 	devicecompat="$(uci -q get system.@system[0].compat_version)"
 	[ -n "$devicecompat" ] || devicecompat="1.0"
@@ -61,7 +63,16 @@ fwtool_check_image() {
 	json_get_keys dev_keys
 	for k in $dev_keys; do
 		json_get_var dev "$k"
-		if [ "$dev" = "$device" ]; then
+		# Step 2.
+		# lets start with the original case [ "$dev" = "$device" ]
+		# if the evaluated firmware is vanila openwrt, this evals as true -ie
+		# [ ("$dev" == "glinet.gl-b3000") == ("$device" == "glinet,gl-b3000") ]
+		# however if the firmware is oem then $dev = b3000 and the above check fails resulting 
+		# in the erroneous warnings.
+		# so we add the secondary check [ "$dev" = "$oem" ];
+		# If in Step 1 the oem_file was found and valid, the $oem == "b3000" so
+		# [ ("$dev" == "b3000) == ("$oem" == "b3000") ] so firmware is valid oem
+		if [ "$dev" = "$device" ] || [ "$dev" = "$oem" ]; then
 			# major compat version -> no sysupgrade
 			if [ "${devicecompat%.*}" != "${imagecompat%.*}" ]; then
 				v "The device is supported, but this image is incompatible for sysupgrade based on the image version ($devicecompat->$imagecompat)."
@@ -70,7 +81,16 @@ fwtool_check_image() {
 			fi
 
 			# minor compat version -> sysupgrade with -n required
-			if [ "${devicecompat#.*}" != "${imagecompat#.*}" ] && [ "$SAVE_CONFIG" = "1" ]; then
+			# Step 3.
+			# here we must check if $dev == $oem to use this native compatability check
+			# so we add the check for [ "$dev" = "$oem" ]
+			if (([ "${devicecompat#.*}" != "${imagecompat#.*}" ] || [ "$dev" = "$oem" ])) && [ "$SAVE_CONFIG" = "1" ]; then
+				# Step 4.
+				# here we have to gaurd against the default case, oem may exsist and default will pass 
+				# the original check [ "${devicecompat#.*}" != "${imagecompat#.*}" ] so we must
+				# explicitly check $dev == $oem, if it is we update(reuse) the $devicecompat and imagecompat
+				# variable to reflect the case - ( Openwrt -> OEM )
+				[ "$dev" = "$oem" ] && devicecompat="Openwrt " && imagecompat=" OEM"
 				[ "$IGNORE_MINOR_COMPAT" = 1 ] && return 0
 				v "The device is supported, but the config is incompatible to the new image ($devicecompat->$imagecompat). Please upgrade without keeping config (sysupgrade -n)."
 				[ -n "$compatmessage" ] && v "$compatmessage"