FreeBSD jailua for Jail management

jailua.lua

#!/usr/libexec/flua
local ucl = require('ucl')
local jail = require('jail')

function usage()
  print(arg[0] .. " [ list | create jail.ucl | remove jail.ucl [jname] ]")
end

if #arg < 1 then
  usage()
  os.exit()
end

function remove()
  print("TBD")
end

function list()
  for jparams in jail.list() do
    print(jparams["jid"] .. " = " .. jparams["name"])
  end
end

function create(arg)
  -- Check arg count
  if #arg < 2 then
    usage()
    os.exit()
  end

  -- initiate parser and parse file
  parser = ucl.parser()
  res, err = parser:parse_file(arg[2])
  if not res then
    print('error: ' .. err)
    os.exit(1)
  end

  -- convert all objects to lua
  conf = parser:get_object()

  -- get all jail parameters
  allparams = jail.allparams()

  -- iterate over jails in conf
  for jn, jc in pairs(conf) do
    params = {}
    io.write("Creating new(?) jail ")
    io.write(jn)
    io.write(' :')
    for i = 1, #allparams do
      if jc[allparams[i]] ~= nil then
        params[allparams[i]] = tostring(jc[allparams[i]])
      end
    end

    -- check if jail exists
    jid, err = jail.getid(jn)
    if jid then
      print(' EXISTS! jid = ' .. jid)
      os.exit(1)
    end

    -- create new jail
    jid, err = jail.setparams(jn, params, jail.CREATE)
    if not jid then
      print(' ERROR: ' .. err)
    else
      print(' DONE! jid = ' .. jid)
    end
  end
end

if     arg[1] == 'list'   then list()
elseif arg[1] == 'create' then create(arg)
elseif arg[1] == 'remove' then remove(arg)
else                           usage()
end

output

root@devbsd:/mnt/zvartnots/FreeBSD/jailua # jls
   JID  IP Address      Hostname                      Path
     1  127.0.0.2       3285056f.devbsd.zvartnots.loc /usr/local/jails/3285056f
     2  127.0.0.3       360410a7.devbsd.zvartnots.loc /usr/local/jails/360410a7
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # cat ~/jail.ucl
jail0: {
  path: "/usr/local/jails/jail0",
  exec.start: "/bin/sh /etc/rc",
  persist = true
}
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua 
./jailua [ list | create jail.ucl | remove jail.ucl [jname] ]
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua list
1 = 3285056f
2 = 360410a7
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua create ~/jail.ucl
Creating new(?) jail jail0 : DONE! jid = 8
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua list
1 = 3285056f
2 = 360410a7
8 = jail0
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua create ~/jail.ucl
Creating new(?) jail jail0 : EXISTS! jid = 8
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # jail -r 8
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua create ~/jail.ucl
Creating new(?) jail jail0 : DONE! jid = 9
root@devbsd:/mnt/zvartnots/FreeBSD/jailua # ./jailua list
1 = 3285056f
2 = 360410a7
9 = jail0