recovery-initramfs: add retry when searching SWU package file

This commit adds a retry to the swu_package_path function of
the recovery-initramfs-init script. It has been seen that
with some USB memory stick a retry is necessary to mount
the external storage device containing the SWU package.
If the SWU package file is found before the max retries
is reached the loop will be exited and the SWU installation
will start. If max retry is reached and the SWU package
wasn't found it finishes with an error.

Signed-off-by: Mike Engel <Mike.Engel@digi.com>

https://onedigi.atlassian.net/browse/DEL-9908

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

@@ -364,19 +364,29 @@ swu_package_path() {
 	# Check whether the package is local and get the absolute path.
 	if echo "${1}" | grep -qs '^file://'; then
 		local pkg_name="$(basename ${1})"
+		local success=false
+		local retries=1
+		local max_retries=10
 
-		for i in ${UPDATE_MOUNT_DIR} $(echo ${USB_MOUNT_DIR}/*); do
-			echo $i | grep -qs "${USB_MOUNT_DIR}/\*" && continue
-			if [ -f "${i}/${pkg_name}" ]; then
-				swu_abspath="${i}/${pkg_name}"
-				break
+		while [ $success = false ] && [ $retries -le $max_retries ]; do
+			for i in ${UPDATE_MOUNT_DIR} $(echo ${USB_MOUNT_DIR}/*); do
+				echo $i | grep -qs "${USB_MOUNT_DIR}/\*" && continue
+				if [ -f "${i}/${pkg_name}" ]; then
+					swu_abspath="${i}/${pkg_name}"
+					break
+				fi
+			done
+
+			if [ -n "${swu_abspath}" ]; then
+				echo "${swu_abspath}"
+				success=true
+			else
+				sleep 1
+				retries=$(( retries + 1 ))
 			fi
 		done
-
-		if [ -n "${swu_abspath}" ]; then
-			echo "${swu_abspath}"
-		else
-			quit_with_error "Unable to find update package '${pkg_name}'"
+		if [ -z "${swu_abspath}" ]; then
+			quit_with_error "Unable to find update package '${pkg_name}' after ${max_retries} retries"
 		fi
 	else
 		echo "${1}"
@@ -513,9 +523,6 @@ echo > /dev/mdev.seq
 echo > /dev/mdev.log
 mdev -d
 
-# Give some time for the devices to settle down so mdev can mount all of them
-sleep 2
-
 # Run all shell scripts in postinstall folder
 run-parts /etc/*-postinsts