1#!/usr/libexec/flua 2--[[ 3/*- 4 * SPDX-License-Identifier: BSD-2-Clause 5 * 6 * Copyright (c) 2020, Ryan Moeller <freqlabs@FreeBSD.org> 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31]]-- 32 33jail = require("jail") 34ucl = require("ucl") 35 36name = "demo" 37 38local has_demo = false 39 40-- Make sure we don't have a demo jail to start with; "jid" and "name" are 41-- always present. 42for jparams in jail.list() do 43 if jparams["name"] == name then 44 has_demo = true 45 break 46 end 47end 48 49if not has_demo then 50 -- Create a persistent jail named "demo" with all other parameters default. 51 jid, err = jail.setparams(name, {persist = "true"}, jail.CREATE) 52 if not jid then 53 error(err) 54 end 55end 56 57-- Get a list of all known jail parameter names. 58allparams = jail.allparams() 59 60-- Get all the parameters of the jail we created. 61jid, res = jail.getparams(name, allparams) 62if not jid then 63 error(res) 64end 65 66-- Display the jail's parameters as a pretty-printed JSON object. 67print(ucl.to_json(res)) 68 69-- Confirm that we still have it for now. 70has_demo = false 71for jparams in jail.list() do 72 if jparams["name"] == name then 73 has_demo = true 74 break 75 end 76end 77 78if not has_demo then 79 print("demo does not exist") 80end 81 82-- Update the "persist" parameter to "false" to remove the jail. 83jid, err = jail.setparams(name, {persist = "false"}, jail.UPDATE) 84if not jid then 85 error(err) 86end 87 88-- Verify that the jail is no longer on the system. 89local is_persistent = false 90has_demo = false 91for jparams in jail.list({"persist"}) do 92 if jparams["name"] == name then 93 has_demo = true 94 jid = jparams["jid"] 95 is_persistent = jparams["persist"] ~= "false" 96 end 97end 98 99-- In fact, it does remain until this process ends -- c'est la vie. 100if has_demo then 101 io.write("demo still exists, jid " .. jid .. ", ") 102 if is_persistent then 103 io.write("persistent\n") 104 else 105 io.write("not persistent\n") 106 end 107end 108