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init: avoid error message if /etc/fstab is missing in sysroot

--- a/initramfs-init.in

+++ b/initramfs-init.in

@@ -572,11 +572,12 @@

 fi

 # respect mount options in fstab for ALPINE_MNT (e.g if user wants rw)

-opts=$(awk "\$2 == \"$ALPINE_MNT\" {print \$4}" $sysroot/etc/fstab)

-if [ -n "$opts" ]; then

-	mount -o remount,$opts "$ALPINE_MNT"

+if [ -f "$sysroot"/etc/fstab ]; then

+	opts=$(awk "\$2 == \"$ALPINE_MNT\" {print \$4}" $sysroot/etc/fstab)

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

+		mount -o remount,$opts "$ALPINE_MNT"

+	fi

 fi

-

 # fix inittab if alternative console

 setup_inittab_console $CONSOLE