Update to manage_dtoverlays.sh for overlay_prefix handling (revised) (#615)

* Update manage_dtoverlays.sh, overlay_prefix handling

For issues #612 and #592 where overlays don't load because the overlay_prefix gets written to armbianEnv.txt along with the overlay name. See #612 and #592 for details.

* Update manage_dtoverlays.sh per rabbit review comments

Updated per code rabbit suggestions and added handling the presence of a hyphen "-" following the prefix as a separate check.

* Update manage_dtoverlays.sh

Fixed issue with overlay status update failing due to remaining "-" not being removed along with overlay_prefix.

Author: TMSL

tools/modules/system/manage_dtoverlays.sh

@@ -104,6 +104,14 @@ function manage_dtoverlays () {
 			grep '^overlays' ${overlayconf} | grep -qw ${overlay} && status=ON
 			# Raspberry Pi
 			grep '^dtoverlay' ${overlayconf} | grep -qw ${overlay} && status=ON
+   			# handle case where overlay_prefix is part of overlay name
+	 		if [[ -n $overlay_prefix ]]; then
+				candidate="${overlay#$overlay_prefix}" 
+    				candidate="${candidate#'-'}" # remove any trailing hyphen 
+			else
+				candidate="$overlay"
+			fi
+			grep '^overlays' ${overlayconf} | grep -qw ${candidate} && status=ON
 			options+=( "$overlay" "" "$status")
 		done
 		selection=$($DIALOG --title "Manage devicetree overlays" --cancel-button "Back" \
@@ -114,6 +122,19 @@ function manage_dtoverlays () {
 			0)
 				changes="true"
 				newoverlays=$(echo $selection | sed 's/"//g')
+				# handle case where overlay_prefix is part of overlay name
+				IFS=' ' read -r -a ovs <<< "$newoverlays"
+				newoverlays=""
+				# remove prefix, if any
+				for ov in "${ovs[@]}"; do
+					if [[ -n $overlay_prefix && $ov == "$overlay_prefix"* ]]; then
+						ov="${ov#$overlay_prefix}"
+					fi
+	 				# remove '-' hyphen from beginning of ov, if any
+	  				ov="${ov#-}"
+					newoverlays+="$ov "
+				done
+				newoverlays="${newoverlays% }"
 				# Raspberry Pi
 				if [[ "${LINUXFAMILY}" == "bcm2711" ]]; then
 					# Remove any existing Armbian config block