1-- 2-- SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3-- 4-- Copyright (c) 2015 Pedro Souza <pedrosouza@freebsd.org> 5-- Copyright (C) 2018 Kyle Evans <kevans@FreeBSD.org> 6-- All rights reserved. 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 AUTHOR 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 AUTHOR 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 32local hook = require("hook") 33 34local config = {} 35local modules = {} 36local carousel_choices = {} 37-- Which variables we changed 38local env_changed = {} 39-- Values to restore env to (nil to unset) 40local env_restore = {} 41 42local MSG_FAILEXEC = "Failed to exec '%s'" 43local MSG_FAILSETENV = "Failed to '%s' with value: %s" 44local MSG_FAILOPENCFG = "Failed to open config: '%s'" 45local MSG_FAILREADCFG = "Failed to read config: '%s'" 46local MSG_FAILPARSECFG = "Failed to parse config: '%s'" 47local MSG_FAILEXBEF = "Failed to execute '%s' before loading '%s'" 48local MSG_FAILEXMOD = "Failed to execute '%s'" 49local MSG_FAILEXAF = "Failed to execute '%s' after loading '%s'" 50local MSG_MALFORMED = "Malformed line (%d):\n\t'%s'" 51local MSG_DEFAULTKERNFAIL = "No kernel set, failed to load from module_path" 52local MSG_KERNFAIL = "Failed to load kernel '%s'" 53local MSG_KERNLOADING = "Loading kernel..." 54local MSG_MODLOADING = "Loading configured modules..." 55local MSG_MODLOADFAIL = "Could not load one or more modules!" 56 57local function restoreEnv() 58 -- Examine changed environment variables 59 for k, v in pairs(env_changed) do 60 local restore_value = env_restore[k] 61 if restore_value == nil then 62 -- This one doesn't need restored for some reason 63 goto continue 64 end 65 local current_value = loader.getenv(k) 66 if current_value ~= v then 67 -- This was overwritten by some action taken on the menu 68 -- most likely; we'll leave it be. 69 goto continue 70 end 71 restore_value = restore_value.value 72 if restore_value ~= nil then 73 loader.setenv(k, restore_value) 74 else 75 loader.unsetenv(k) 76 end 77 ::continue:: 78 end 79 80 env_changed = {} 81 env_restore = {} 82end 83 84local function setEnv(key, value) 85 -- Track the original value for this if we haven't already 86 if env_restore[key] == nil then 87 env_restore[key] = {value = loader.getenv(key)} 88 end 89 90 env_changed[key] = value 91 92 return loader.setenv(key, value) 93end 94 95-- name here is one of 'name', 'type', flags', 'before', 'after', or 'error.' 96-- These are set from lines in loader.conf(5): ${key}_${name}="${value}" where 97-- ${key} is a module name. 98local function setKey(key, name, value) 99 if modules[key] == nil then 100 modules[key] = {} 101 end 102 modules[key][name] = value 103end 104 105local pattern_table = { 106 { 107 str = "^%s*(#.*)", 108 process = function(_, _) end, 109 }, 110 -- module_load="value" 111 { 112 str = "^%s*([%w_]+)_load%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 113 process = function(k, v) 114 if modules[k] == nil then 115 modules[k] = {} 116 end 117 modules[k].load = v:upper() 118 end, 119 }, 120 -- module_name="value" 121 { 122 str = "^%s*([%w_]+)_name%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 123 process = function(k, v) 124 setKey(k, "name", v) 125 end, 126 }, 127 -- module_type="value" 128 { 129 str = "^%s*([%w_]+)_type%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 130 process = function(k, v) 131 setKey(k, "type", v) 132 end, 133 }, 134 -- module_flags="value" 135 { 136 str = "^%s*([%w_]+)_flags%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 137 process = function(k, v) 138 setKey(k, "flags", v) 139 end, 140 }, 141 -- module_before="value" 142 { 143 str = "^%s*([%w_]+)_before%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 144 process = function(k, v) 145 setKey(k, "before", v) 146 end, 147 }, 148 -- module_after="value" 149 { 150 str = "^%s*([%w_]+)_after%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 151 process = function(k, v) 152 setKey(k, "after", v) 153 end, 154 }, 155 -- module_error="value" 156 { 157 str = "^%s*([%w_]+)_error%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 158 process = function(k, v) 159 setKey(k, "error", v) 160 end, 161 }, 162 -- exec="command" 163 { 164 str = "^%s*exec%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 165 process = function(k, _) 166 if cli_execute_unparsed(k) ~= 0 then 167 print(MSG_FAILEXEC:format(k)) 168 end 169 end, 170 }, 171 -- env_var="value" 172 { 173 str = "^%s*([%w%p]+)%s*=%s*\"([%w%s%p]-)\"%s*(.*)", 174 process = function(k, v) 175 if setEnv(k, v) ~= 0 then 176 print(MSG_FAILSETENV:format(k, v)) 177 end 178 end, 179 }, 180 -- env_var=num 181 { 182 str = "^%s*([%w%p]+)%s*=%s*(%d+)%s*(.*)", 183 process = function(k, v) 184 if setEnv(k, v) ~= 0 then 185 print(MSG_FAILSETENV:format(k, tostring(v))) 186 end 187 end, 188 }, 189} 190 191local function isValidComment(line) 192 if line ~= nil then 193 local s = line:match("^%s*#.*") 194 if s == nil then 195 s = line:match("^%s*$") 196 end 197 if s == nil then 198 return false 199 end 200 end 201 return true 202end 203 204local function loadModule(mod, silent) 205 local status = true 206 local pstatus 207 for k, v in pairs(mod) do 208 if v.load ~= nil and v.load:lower() == "yes" then 209 local str = "load " 210 if v.flags ~= nil then 211 str = str .. v.flags .. " " 212 end 213 if v.type ~= nil then 214 str = str .. "-t " .. v.type .. " " 215 end 216 if v.name ~= nil then 217 str = str .. v.name 218 else 219 str = str .. k 220 end 221 if v.before ~= nil then 222 pstatus = cli_execute_unparsed(v.before) == 0 223 if not pstatus and not silent then 224 print(MSG_FAILEXBEF:format(v.before, k)) 225 end 226 status = status and pstatus 227 end 228 229 if cli_execute_unparsed(str) ~= 0 then 230 if not silent then 231 print(MSG_FAILEXMOD:format(str)) 232 end 233 if v.error ~= nil then 234 cli_execute_unparsed(v.error) 235 end 236 status = false 237 end 238 239 if v.after ~= nil then 240 pstatus = cli_execute_unparsed(v.after) == 0 241 if not pstatus and not silent then 242 print(MSG_FAILEXAF:format(v.after, k)) 243 end 244 status = status and pstatus 245 end 246 247 end 248 end 249 250 return status 251end 252 253 254local function readFile(name, silent) 255 local f = io.open(name) 256 if f == nil then 257 if not silent then 258 print(MSG_FAILOPENCFG:format(name)) 259 end 260 return nil 261 end 262 263 local text, _ = io.read(f) 264 -- We might have read in the whole file, this won't be needed any more. 265 io.close(f) 266 267 if text == nil and not silent then 268 print(MSG_FAILREADCFG:format(name)) 269 end 270 return text 271end 272 273local function checkNextboot() 274 local nextboot_file = loader.getenv("nextboot_file") 275 if nextboot_file == nil then 276 return 277 end 278 279 local text = readFile(nextboot_file, true) 280 if text == nil then 281 return 282 end 283 284 if text:match("^nextboot_enable=\"NO\"") ~= nil then 285 -- We're done; nextboot is not enabled 286 return 287 end 288 289 if not config.parse(text) then 290 print(MSG_FAILPARSECFG:format(nextboot_file)) 291 end 292 293 -- Attempt to rewrite the first line and only the first line of the 294 -- nextboot_file. We overwrite it with nextboot_enable="NO", then 295 -- check for that on load. 296 -- It's worth noting that this won't work on every filesystem, so we 297 -- won't do anything notable if we have any errors in this process. 298 local nfile = io.open(nextboot_file, 'w') 299 if nfile ~= nil then 300 -- We need the trailing space here to account for the extra 301 -- character taken up by the string nextboot_enable="YES" 302 -- Or new end quotation mark lands on the S, and we want to 303 -- rewrite the entirety of the first line. 304 io.write(nfile, "nextboot_enable=\"NO\" ") 305 io.close(nfile) 306 end 307end 308 309-- Module exports 310config.verbose = false 311 312-- The first item in every carousel is always the default item. 313function config.getCarouselIndex(id) 314 return carousel_choices[id] or 1 315end 316 317function config.setCarouselIndex(id, idx) 318 carousel_choices[id] = idx 319end 320 321-- Returns true if we processed the file successfully, false if we did not. 322-- If 'silent' is true, being unable to read the file is not considered a 323-- failure. 324function config.processFile(name, silent) 325 if silent == nil then 326 silent = false 327 end 328 329 local text = readFile(name, silent) 330 if text == nil then 331 return silent 332 end 333 334 return config.parse(text) 335end 336 337-- silent runs will not return false if we fail to open the file 338function config.parse(text) 339 local n = 1 340 local status = true 341 342 for line in text:gmatch("([^\n]+)") do 343 if line:match("^%s*$") == nil then 344 local found = false 345 346 for _, val in ipairs(pattern_table) do 347 local k, v, c = line:match(val.str) 348 if k ~= nil then 349 found = true 350 351 if isValidComment(c) then 352 val.process(k, v) 353 else 354 print(MSG_MALFORMED:format(n, 355 line)) 356 status = false 357 end 358 359 break 360 end 361 end 362 363 if not found then 364 print(MSG_MALFORMED:format(n, line)) 365 status = false 366 end 367 end 368 n = n + 1 369 end 370 371 return status 372end 373 374-- other_kernel is optionally the name of a kernel to load, if not the default 375-- or autoloaded default from the module_path 376function config.loadKernel(other_kernel) 377 local flags = loader.getenv("kernel_options") or "" 378 local kernel = other_kernel or loader.getenv("kernel") 379 380 local function tryLoad(names) 381 for name in names:gmatch("([^;]+)%s*;?") do 382 local r = loader.perform("load " .. flags .. 383 " " .. name) 384 if r == 0 then 385 return name 386 end 387 end 388 return nil 389 end 390 391 local function loadBootfile() 392 local bootfile = loader.getenv("bootfile") 393 394 -- append default kernel name 395 if bootfile == nil then 396 bootfile = "kernel" 397 else 398 bootfile = bootfile .. ";kernel" 399 end 400 401 return tryLoad(bootfile) 402 end 403 404 -- kernel not set, try load from default module_path 405 if kernel == nil then 406 local res = loadBootfile() 407 408 if res ~= nil then 409 -- Default kernel is loaded 410 config.kernel_loaded = nil 411 return true 412 else 413 print(MSG_DEFAULTKERNFAIL) 414 return false 415 end 416 else 417 -- Use our cached module_path, so we don't end up with multiple 418 -- automatically added kernel paths to our final module_path 419 local module_path = config.module_path 420 local res 421 422 if other_kernel ~= nil then 423 kernel = other_kernel 424 end 425 -- first try load kernel with module_path = /boot/${kernel} 426 -- then try load with module_path=${kernel} 427 local paths = {"/boot/" .. kernel, kernel} 428 429 for _, v in pairs(paths) do 430 loader.setenv("module_path", v) 431 res = loadBootfile() 432 433 -- succeeded, add path to module_path 434 if res ~= nil then 435 config.kernel_loaded = kernel 436 if module_path ~= nil then 437 loader.setenv("module_path", v .. ";" .. 438 module_path) 439 end 440 return true 441 end 442 end 443 444 -- failed to load with ${kernel} as a directory 445 -- try as a file 446 res = tryLoad(kernel) 447 if res ~= nil then 448 config.kernel_loaded = kernel 449 return true 450 else 451 print(MSG_KERNFAIL:format(kernel)) 452 return false 453 end 454 end 455end 456 457function config.selectKernel(kernel) 458 config.kernel_selected = kernel 459end 460 461function config.load(file) 462 if not file then 463 file = "/boot/defaults/loader.conf" 464 end 465 466 if not config.processFile(file) then 467 print(MSG_FAILPARSECFG:format(file)) 468 end 469 470 local f = loader.getenv("loader_conf_files") 471 if f ~= nil then 472 for name in f:gmatch("([%w%p]+)%s*") do 473 -- These may or may not exist, and that's ok. Do a 474 -- silent parse so that we complain on parse errors but 475 -- not for them simply not existing. 476 if not config.processFile(name, true) then 477 print(MSG_FAILPARSECFG:format(name)) 478 end 479 end 480 end 481 482 checkNextboot() 483 484 -- Cache the provided module_path at load time for later use 485 config.module_path = loader.getenv("module_path") 486 local verbose = loader.getenv("verbose_loading") or "no" 487 config.verbose = verbose:lower() == "yes" 488end 489 490-- Reload configuration 491function config.reload(file) 492 modules = {} 493 restoreEnv() 494 config.load(file) 495 hook.runAll("config.reloaded") 496end 497 498function config.loadelf() 499 local kernel = config.kernel_selected or config.kernel_loaded 500 local loaded 501 502 print(MSG_KERNLOADING) 503 loaded = config.loadKernel(kernel) 504 505 if not loaded then 506 return 507 end 508 509 print(MSG_MODLOADING) 510 if not loadModule(modules, not config.verbose) then 511 print(MSG_MODLOADFAIL) 512 end 513end 514 515hook.registerType("config.reloaded") 516return config 517