This file is indexed.

/usr/share/lua/5.2/lxc.lua is in lua-lxc 2.0.0-0ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
--
-- lua lxc module
--
-- Copyright © 2012 Oracle.
--
-- Authors:
-- Dwight Engen <dwight.engen@oracle.com>
--
--  This library is free software; you can redistribute it and/or
--  modify it under the terms of the GNU Lesser General Public
--  License as published by the Free Software Foundation; either
--  version 2.1 of the License, or (at your option) any later version.
--
--  This library is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
--  Lesser General Public License for more details.
--
--  You should have received a copy of the GNU Lesser General Public
--  License along with this library; if not, write to the Free Software
--  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
--

local core   = require("lxc.core")
local lfs    = require("lfs")
local table  = require("table")
local string = require("string")
local io     = require("io")
module("lxc", package.seeall)

local lxc_path
local log_level = 3

-- lua 5.1 compat
if table.unpack == nil then
    table.unpack = unpack
end

-- the following two functions can be useful for debugging
function printf(...)
    local function wrapper(...) io.write(string.format(...)) end
    local status, result = pcall(wrapper, ...)
    if not status then
	error(result, 2)
    end
end

function log(level, ...)
    if (log_level >= level) then
	printf(os.date("%Y-%m-%d %T "))
	printf(...)
    end
end

function string:split(delim, max_cols)
    local cols = {}
    local start = 1
    local nextc
    repeat
	nextc = string.find(self, delim, start)
	if (nextc and #cols ~= max_cols - 1) then
	    table.insert(cols, string.sub(self, start, nextc-1))
	    start = nextc + #delim
	else
	    table.insert(cols, string.sub(self, start, string.len(self)))
	    nextc = nil
	end
    until nextc == nil or start > #self
    return cols
end

-- container class
container = {}
container_mt = {}
container_mt.__index = container

function container:new(lname, config)
    local lcore
    local lnetcfg = {}
    local lstats = {}

    if lname then
	if config then
	    lcore = core.container_new(lname, config)
	else
	    lcore = core.container_new(lname)
	end
    end

    return setmetatable({ctname = lname, core = lcore, netcfg = lnetcfg, stats = lstats}, container_mt)
end

-- methods interfacing to core functionality
function container:attach(what, ...)
    return self.core:attach(what, ...)
end

function container:config_file_name()
    return self.core:config_file_name()
end

function container:defined()
    return self.core:defined()
end

function container:init_pid()
    return self.core:init_pid()
end

function container:name()
    return self.core:name()
end

function container:start()
    return self.core:start()
end

function container:stop()
    return self.core:stop()
end

function container:shutdown(timeout)
    return self.core:shutdown(timeout)
end

function container:wait(state, timeout)
    return self.core:wait(state, timeout)
end

function container:freeze()
    return self.core:freeze()
end

function container:unfreeze()
    return self.core:unfreeze()
end

function container:running()
    return self.core:running()
end

function container:state()
    return self.core:state()
end

function container:create(template, ...)
    return self.core:create(template, ...)
end

function container:destroy()
    return self.core:destroy()
end

-- return nil if name missing
function container:rename(name)
    return self.core:rename(name)
end

function container:get_config_path()
    return self.core:get_config_path()
end

function container:set_config_path(path)
    return self.core:set_config_path(path)
end

function container:append_config_item(key, value)
    return self.core:set_config_item(key, value)
end

function container:clear_config_item(key)
    return self.core:clear_config_item(key)
end

function container:get_cgroup_item(key)
    return self.core:get_cgroup_item(key)
end

function container:get_config_item(key)
    local value
    local vals = {}

    value = self.core:get_config_item(key)

    -- check if it is a single item
    if (not value or not string.find(value, "\n")) then
	return value
    end

    -- it must be a list type item, make a table of it
    vals = value:split("\n", 1000)
    -- make it a "mixed" table, ie both dictionary and list for ease of use
    for _,v in ipairs(vals) do
	vals[v] = true
    end
    return vals
end

function container:set_cgroup_item(key, value)
    return self.core:set_cgroup_item(key, value)
end

function container:set_config_item(key, value)
    return self.core:set_config_item(key, value)
end

function container:get_keys(base)
    local ktab = {}
    local keys

    if (base) then
	keys = self.core:get_keys(base)
	base = base .. "."
    else
	keys = self.core:get_keys()
	base = ""
    end
    if (keys == nil) then
	return nil
    end
    keys = keys:split("\n", 1000)
    for _,v in ipairs(keys) do
	local config_item = base .. v
	ktab[v] = self.core:get_config_item(config_item)
    end
    return ktab
end

-- return nil or more args
function container:get_interfaces()
    return self.core:get_interfaces()
end

-- return nil or more args
function container:get_ips(...)
    return self.core:get_ips(...)
end

function container:load_config(alt_path)
    if (alt_path) then
	return self.core:load_config(alt_path)
    else
	return self.core:load_config()
    end
end

function container:save_config(alt_path)
    if (alt_path) then
	return self.core:save_config(alt_path)
    else
	return self.core:save_config()
    end
end

-- methods for stats collection from various cgroup files
-- read integers at given coordinates from a cgroup file
function container:stat_get_ints(item, coords)
    local lines = {}
    local result = {}
    local flines = self:get_cgroup_item(item)

    if (flines == nil) then
	for k,c in ipairs(coords) do
	    table.insert(result, 0)
	end
    else
	for line in flines:gmatch("[^\r\n]+") do
	    table.insert(lines, line)
	end
	for k,c in ipairs(coords) do
	    local col

	    col = lines[c[1]]:split(" ", 80)
	    local val = tonumber(col[c[2]])
	    table.insert(result, val)
	end
    end
    return table.unpack(result)
end

-- read an integer from a cgroup file
function container:stat_get_int(item)
    local line = self:get_cgroup_item(item)
    -- if line is nil (on an error like Operation not supported because
    -- CONFIG_MEMCG_SWAP_ENABLED isn't enabled) return 0
    return tonumber(line) or 0
end

function container:stat_match_get_int(item, match, column)
    local val
    local lines = self:get_cgroup_item(item)

    if (lines == nil) then
       return 0
    end

    for line in lines:gmatch("[^\r\n]+") do
	if (string.find(line, match)) then
	    local col

	    col = line:split(" ", 80)
	    val = tonumber(col[column]) or 0
	end
    end

    return val
end

function container:stats_get(total)
    local stat = {}
    stat.mem_used      = self:stat_get_int("memory.usage_in_bytes")
    stat.mem_limit     = self:stat_get_int("memory.limit_in_bytes")
    stat.memsw_used    = self:stat_get_int("memory.memsw.usage_in_bytes")
    stat.memsw_limit   = self:stat_get_int("memory.memsw.limit_in_bytes")
    stat.kmem_used     = self:stat_get_int("memory.kmem.usage_in_bytes")
    stat.kmem_limit    = self:stat_get_int("memory.kmem.limit_in_bytes")
    stat.cpu_use_nanos = self:stat_get_int("cpuacct.usage")
    stat.cpu_use_user,
    stat.cpu_use_sys   = self:stat_get_ints("cpuacct.stat", {{1, 2}, {2, 2}})
    stat.blkio         = self:stat_match_get_int("blkio.throttle.io_service_bytes", "Total", 2)

    if (total) then
	total.mem_used      = total.mem_used      + stat.mem_used
	total.mem_limit     = total.mem_limit     + stat.mem_limit
	total.memsw_used    = total.memsw_used    + stat.memsw_used
	total.memsw_limit   = total.memsw_limit   + stat.memsw_limit
	total.kmem_used     = total.kmem_used     + stat.kmem_used
	total.kmem_limit    = total.kmem_limit    + stat.kmem_limit
	total.cpu_use_nanos = total.cpu_use_nanos + stat.cpu_use_nanos
	total.cpu_use_user  = total.cpu_use_user  + stat.cpu_use_user
	total.cpu_use_sys   = total.cpu_use_sys   + stat.cpu_use_sys
	total.blkio         = total.blkio         + stat.blkio
    end
    return stat
end

local M = { container = container }

function M.stats_clear(stat)
    stat.mem_used      = 0
    stat.mem_limit     = 0
    stat.memsw_used    = 0
    stat.memsw_limit   = 0
    stat.kmem_used     = 0
    stat.kmem_limit    = 0
    stat.cpu_use_nanos = 0
    stat.cpu_use_user  = 0
    stat.cpu_use_sys   = 0
    stat.blkio         = 0
end

-- return configured containers found in LXC_PATH directory
function M.containers_configured(names_only)
    local containers = {}

    for dir in lfs.dir(lxc_path) do
	if (dir ~= "." and dir ~= "..")
	then
	    local cfgfile = lxc_path .. "/" .. dir .. "/config"
	    local cfgattr = lfs.attributes(cfgfile)

	    if (cfgattr and cfgattr.mode == "file") then
		if (names_only) then
		    -- note, this is a "mixed" table, ie both dictionary and list
		    containers[dir] = true
		    table.insert(containers, dir)
		else
		    local ct = container:new(dir)
		    -- note, this is a "mixed" table, ie both dictionary and list
		    containers[dir] = ct
		    table.insert(containers, dir)
		end
	    end
	end
    end
    table.sort(containers, function (a,b) return (a < b) end)
    return containers
end

-- return running containers found in cgroup fs
function M.containers_running(names_only)
    local containers = {}
    local names = M.containers_configured(true)

    for _,name in ipairs(names) do
	local ct = container:new(name)
	if ct:running() then
		-- note, this is a "mixed" table, ie both dictionary and list
		table.insert(containers, name)
		if (names_only) then
		    containers[name] = true
		    ct = nil
		else
		    containers[name] = ct
		end
	end
    end

    table.sort(containers, function (a,b) return (a < b) end)
    return containers
end

function M.version_get()
    return core.version_get()
end

function M.default_config_path_get()
    return core.default_config_path_get()
end

function M.cmd_get_config_item(name, item, lxcpath)
    if (lxcpath) then
	return core.cmd_get_config_item(name, item, lxcpath)
    else
	return core.cmd_get_config_item(name, item)
    end
end

lxc_path = core.default_config_path_get()

return M