applications/luci-app-lxc/luasrc/controller/lxc.lua

   1 --[[
   2
   3 LuCI LXC module
   4
   5 Copyright (C) 2014, Cisco Systems, Inc.
   6
   7 Licensed under the Apache License, Version 2.0 (the "License");
   8 you may not use this file except in compliance with the License.
   9 You may obtain a copy of the License at
  10
  11         http://www.apache.org/licenses/LICENSE-2.0
  12
  13 Author: Petar Koretic <petar.koretic@sartura.hr>
  14
  15 ]]--
  16
  17 local uci  = require "luci.model.uci".cursor()
  18 local util = require "luci.util"
  19 local fs   = require "nixio"
  20
  21 module("luci.controller.lxc", package.seeall)
  22
  23 function fork_exec(command)
  24         local pid = fs.fork()
  25         if pid > 0 then
  26                 return
  27         elseif pid == 0 then
  28                 -- change to root dir
  29                 fs.chdir("/")
  30
  31                 -- patch stdin, out, err to /dev/null
  32                 local null = fs.open("/dev/null", "w+")
  33                 if null then
  34                         fs.dup(null, fs.stderr)
  35                         fs.dup(null, fs.stdout)
  36                         fs.dup(null, fs.stdin)
  37                         if null:fileno() > 2 then
  38                                 null:close()
  39                         end
  40                 end
  41
  42                 -- replace with target command
  43                 fs.exec("/bin/sh", "-c", command)
  44         end
  45 end
  46
  47 function index()
  48         page = node("admin", "services", "lxc")
  49         page.target = cbi("lxc")
  50         page.title = _("LXC Containers")
  51         page.order = 70
  52
  53         page = entry({"admin", "services", "lxc_create"}, call("lxc_create"), nil)
  54         page.leaf = true
  55
  56         page = entry({"admin", "services", "lxc_action"}, call("lxc_action"), nil)
  57         page.leaf = true
  58
  59         page = entry({"admin", "services", "lxc_get_downloadable"}, call("lxc_get_downloadable"), nil)
  60         page.leaf = true
  61
  62         page = entry({"admin", "services", "lxc_configuration_get"}, call("lxc_configuration_get"), nil)
  63         page.leaf = true
  64
  65         page = entry({"admin", "services", "lxc_configuration_set"}, call("lxc_configuration_set"), nil)
  66         page.leaf = true
  67
  68 end
  69
  70 function lxc_get_downloadable()
  71         local target = lxc_get_arch_target()
  72         local templates = {}
  73
  74         local f = io.popen('sh /usr/share/lxc/templates/lxc-download --list --no-validate --server %s 2>/dev/null'
  75                 % util.shellquote(uci:get("lxc", "lxc", "url")), 'r')
  76         local line
  77         for line in f:lines() do
  78                 local dist, version, dist_target = line:match("^(%S+)%s+(%S+)%s+(%S+)%s+default%s+%S+$")
  79                 if dist and version and dist_target == target then
  80                         templates[#templates+1] = "%s:%s" %{ dist, version }
  81                 end
  82         end
  83
  84         f:close()
  85
  86         luci.http.prepare_content("application/json")
  87         luci.http.write_json(templates)
  88 end
  89
  90 function lxc_create(lxc_name, lxc_template)
  91         luci.http.prepare_content("text/plain")
  92
  93         if not pcall(dofile, "/etc/openwrt_release") then
  94                 return luci.http.write("1")
  95         end
  96
  97         local lxc_dist, lxc_release = lxc_template:match("^(.+):(.+)$")
  98
  99         luci.http.write(util.ubus("lxc", "create", {
 100                 name = lxc_name,
 101                 template = "download",
 102                 args = {
 103                         "--server", uci:get("lxc", "lxc", "url"),
 104                         "--no-validate",
 105                         "--dist", lxc_dist,
 106                         "--release", lxc_release,
 107                         "--arch", lxc_get_arch_target()
 108                 }
 109         }))
 110 end
 111
 112 function lxc_action(lxc_action, lxc_name)
 113         local data, ec = util.ubus("lxc", lxc_action, lxc_name and { name = lxc_name } or {})
 114
 115         luci.http.prepare_content("application/json")
 116         luci.http.write_json(ec and {} or data)
 117 end
 118
 119 function lxc_get_config_path()
 120         local f = io.open("/etc/lxc/lxc.conf", "r")
 121         local content = f:read("*all")
 122         f:close()
 123
 124         local ret = content:match('^%s*lxc.lxcpath%s*=%s*([^%s]*)')
 125         if ret then
 126                 return ret .. "/"
 127         else
 128                 return "/srv/lxc/"
 129         end
 130 end
 131
 132 function lxc_configuration_get(lxc_name)
 133         luci.http.prepare_content("text/plain")
 134
 135         local f = io.open(lxc_get_config_path() .. lxc_name .. "/config", "r")
 136         local content = f:read("*all")
 137         f:close()
 138
 139         luci.http.write(content)
 140 end
 141
 142 function lxc_configuration_set(lxc_name)
 143         luci.http.prepare_content("text/plain")
 144
 145         local lxc_configuration = luci.http.formvalue("lxc_configuration")
 146
 147         if lxc_configuration == nil then
 148                 return luci.http.write("1")
 149         end
 150
 151         local f, err = io.open(lxc_get_config_path() .. lxc_name .. "/config","w+")
 152         if not f then
 153                 return luci.http.write("2")
 154         end
 155
 156         f:write(lxc_configuration)
 157         f:close()
 158
 159         luci.http.write("0")
 160 end
 161
 162 function lxc_get_arch_target()
 163         local target = fs.uname().machine
 164         local target_map = {
 165                 armv5  = "armel",
 166                 armv6  = "armel",
 167                 armv7  = "armhf",
 168                 armv8  = "arm64",
 169                 x86_64 = "amd64"
 170         }
 171
 172         local k, v
 173         for k, v in pairs(target_map) do
 174                 if target:find(k) then
 175                         return v
 176                 end
 177         end
 178
 179         return target
 180 end