def set_permission(doctype, name, user, permission_to, value=1, everyone=0):
	"""Set share permission."""
	check_share_permission(doctype, name)

	share_name = get_share_name(doctype, name, user, everyone)
	value = int(value)

	if not share_name:
		if value:
			share = add(doctype, name, user, everyone=everyone, **{permission_to: 1})
		else:
			# no share found, nothing to remove
			share = {}
			pass
	else:
		share = frappe.get_doc("DocShare", share_name)
		share.flags.ignore_permissions = True
		share.set(permission_to, value)

		if not value:
			# un-set higher-order permissions too
			if permission_to=="read":
				share.read = share.write = share.share = 0

		share.save()

		if not (share.read or share.write or share.share):
			share.delete()
			share = {}

	return share