certificates: add a mount_cert helper script

Fixes: WIFI-12461
Signed-off-by: John Crispin <john@phrozen.org>

feeds/tip/certificates/files/usr/bin/mount_certs

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+. /lib/functions.sh
+mkdir -p /certificates
+mtd=$(find_mtd_index certificates)
+
+if [ "$(head -c 4 /dev/mtd$mtd)" == "hsqs" ]; then
+	mount -t squashfs /dev/mtdblock$mtd /certificates
+else
+	[ -n "$mtd" -a -f /sys/class/mtd/mtd$mtd/oobsize ] && ubiattach -p /dev/mtd$mtd
+	if [ -n "$(ubinfo -a | grep certificates)" ]; then
+		[ -e /dev/ubi0 ] && mount -t ubifs ubi0:certificates /certificates
+		[ -e /dev/ubi1 ] && mount -t ubifs ubi1:certificates /certificates
+	fi
+fi