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init: choose overlay device with ovl_dev=DEV:FS

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -212,6 +212,13 @@

 if [ "$ALPINE_DEV_FS" = "$ALPINE_DEV" ]; then

 	unset ALPINE_DEV_FS

 fi

+if [ -n "$KOPT_ovl_dev" ] ; then

+	OVL_DEV=${KOPT_ovl_dev%%:*}

+	OVL_DEV_FS=${KOPT_ovl_dev##*:}

+	if [ "$OVL_DEV_FS" = "$OVL_DEV" ]; then

+		unset OVL_DEV_FS

+	fi

+fi

 # look for standard mountpoint locations

 ALPINE_MNT=$(find_mnt /dev/$ALPINE_DEV /etc/fstab)

@@ -305,7 +312,18 @@

 fi

 mount -t tmpfs $root_opts tmpfs $sysroot

-find_ovl_dev

+if [ -n "$OVL_DEV" ]; then

+	mkdir -p /media/$OVL_DEV

+	unset mount_opts

+	if [ -n "$OVL_DEV_FS" ]; then

+		mount_opts="-t $OVL_DEV_FS"

+	fi

+	

+	retry_mount $mount_opts /dev/$OVL_DEV /media/$OVL_DEV >/dev/null 2>&1

+	ovl=$(find_ovl /media/$OVL_DEV)

+else

+	find_ovl_dev

+fi

 if ! [ -f "$ovl" ]; then

 	ovl=$(find_ovl $ALPINE_MNT)

 fi