recovery init: search update package in the different partitions

Instead of using a hardcoded path to the SWU update package, just get
the filename and search the file in the different mounted partitions
(giving priority to the internal 'update' partition over other external
media).

https://jira.digi.com/browse/DEL-3466

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-dey/recipes-core/recovery/recovery-initramfs/recovery-initramfs-init

@@ -317,6 +317,29 @@ format_emmc_block() {
 	fi
 }
 
+#------------------------------------------------------------------------------
+# Function - swu_package_path
+#
+# Get absolute path of update package searching in local media
+#
+# @param ${1}  - SWU package name
+#------------------------------------------------------------------------------
+swu_package_path() {
+	for i in ${UPDATE_MOUNT_DIR} $(echo ${USB_MOUNT_DIR}/*); do
+		echo $i | grep -qs "${USB_MOUNT_DIR}/\*" && continue
+		if [ -f "${i}/${1}" ]; then
+			swu_abspath="${i}/${1}"
+			break
+		fi
+	done
+
+	if [ -n "${swu_abspath}" ]; then
+		echo "${swu_abspath}"
+	else
+		quit_with_error "Unable to find update package '${1}'"
+	fi
+}
+
 # Main
 #------------------------------------------------------------------------------
 # Setup the environment.
@@ -409,12 +432,17 @@ if [ -n "${update_package_bool}" ]; then
 	if [ -z "${update_package}" ]; then
 		quit_with_error "Firmware update package not specified"
 	else
-		log "Update package location: ${update_package}"
+		# Give some time for the devices to settle down
-		# Mount external disks.
 		sleep 5
 		mount_external_disks
-		# Mount update partition.
 		mount_partition update "${UPDATE_MOUNT_DIR}"
+
+		# Check whether the package is local and get the absolute path
+		if echo "${update_package}" | grep -qs '^file://'; then
+			update_package="$(swu_package_path $(basename ${update_package}))"
+		fi
+
+		log "Update package location: ${update_package}"
 		# Execute the progress binary.
 		progress -wp &
 		# Execute the software update.