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init: ignore tty devices that gives I/O errors

fixes https://gitlab.alpinelinux.org/alpine/aports/-/issues/11599

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -111,6 +111,10 @@

 	# Inquire the kernel for list of console= devices

 	consoles="$(for c in console $KOPT_consoles; do list_console_devices $c; done)"

 	for tty in $consoles; do

+		# ignore tty devices that gives I/O error

+		if ! stty -g -F /dev/$tty >/dev/null 2>/dev/null; then

+			continue

+		fi

 		# do nothing if inittab already have the tty set up

 		if ! grep -q "^$tty:" $sysroot/etc/inittab 2>/dev/null; then

 			echo "# enable login on alternative console" \