the comand line argument with space will be split when use --lua

[zhanlangorz]

I need to use resty to run busted, so i use the lua options in .busted configure file like this.

return {

  default = {
    lua = "spec/resty_runner.lua",
  },
}

the spec/resty_runner file content is:

local RESTY_FLAGS = os.getenv("BUSTED_RESTY_FLAGS") or "-e 'setmetatable(_G, nil)'"
local json = require("cjson")
print(json.encode(arg))

-- rebuild the invoked commandline, while inserting extra resty-flags
local cmd = {
    "exec",
    arg[-1],
    "--shdict='tapis_inner_cache 10m'",
    "--shdict='app_cache 10m'",
    "--shdict='local_cache_ipc 10m'",
    RESTY_FLAGS,
}
for i, param in ipairs(arg) do
    table.insert(cmd, "'" .. param .. "'")
end

local _, _, rc = os.execute(table.concat(cmd, " "))
os.exit(rc)

Then i run busted like this: busted '--filter' 'get_subscribe_anchors get success'

The arg on spec/resty_runner print

{"0":"spec\/resty_runner.lua","1":"\/usr\/local\/lib\/luarocks\/rocks-5.1\/busted\/2.1.1-1\/bin\/busted","2":"--ignore-lua","3":"--filter","4":"get_subscribe_anchors","5":"get","6":"success","-1":"\/usr\/bin\/resty"}`

The --filter option value become: "4":"get_subscribe_anchors","5":"get","6":"success"

But the true one is 'get_subscribe_anchors get success'

So, how to get the true option value with space in my spec/resty_runner?