freebsd-dev/stand/lua/core.lua
Kyle Evans 892b3a5272 lualoader: Actually re-raise error in try_include
It was previously only printed, but we do actually want to raise it as a
full blown error so that things don't look OK when they've actually gone
wrong.

The second parameter to error, level, is set to 2 here so that the error
message reflects the position of the try_include caller, rather than the
try_include itself. Example:

LUA ERROR: /boot/lua/loader.lua:46: /boot/lua/local.lua:1: attempt to call a
nil value (global 'cxcint').
2018-03-26 19:06:25 +00:00

397 lines
10 KiB
Lua

--
-- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
--
-- Copyright (c) 2015 Pedro Souza <pedrosouza@freebsd.org>
-- Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
-- All rights reserved.
--
-- Redistribution and use in source and binary forms, with or without
-- modification, are permitted provided that the following conditions
-- are met:
-- 1. Redistributions of source code must retain the above copyright
-- notice, this list of conditions and the following disclaimer.
-- 2. Redistributions in binary form must reproduce the above copyright
-- notice, this list of conditions and the following disclaimer in the
-- documentation and/or other materials provided with the distribution.
--
-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-- SUCH DAMAGE.
--
-- $FreeBSD$
--
local config = require("config")
local hook = require("hook")
local core = {}
local function composeLoaderCmd(cmd_name, argstr)
if argstr ~= nil then
cmd_name = cmd_name .. " " .. argstr
end
return cmd_name
end
-- Globals
-- try_include will return the loaded module on success, or nil on failure.
-- A message will also be printed on failure, with one exception: non-verbose
-- loading will suppress 'module not found' errors.
function try_include(module)
local status, ret = pcall(require, module)
-- ret is the module if we succeeded.
if status then
return ret
end
-- Otherwise, ret is just a message; filter out ENOENT unless we're
-- doing a verbose load. As a consequence, try_include prior to loading
-- configuration will not display 'module not found'. All other errors
-- in loading will be printed.
if config.verbose or ret:match("^module .+ not found") == nil then
error(ret, 2)
end
return nil
end
-- Module exports
-- Commonly appearing constants
core.KEY_BACKSPACE = 8
core.KEY_ENTER = 13
core.KEY_DELETE = 127
-- Note that this is a decimal representation, despite the leading 0 that in
-- other contexts (outside of Lua) may mean 'octal'
core.KEYSTR_ESCAPE = "\027"
core.KEYSTR_CSI = core.KEYSTR_ESCAPE .. "["
core.MENU_RETURN = "return"
core.MENU_ENTRY = "entry"
core.MENU_SEPARATOR = "separator"
core.MENU_SUBMENU = "submenu"
core.MENU_CAROUSEL_ENTRY = "carousel_entry"
function core.setVerbose(verbose)
if verbose == nil then
verbose = not core.verbose
end
if verbose then
loader.setenv("boot_verbose", "YES")
else
loader.unsetenv("boot_verbose")
end
core.verbose = verbose
end
function core.setSingleUser(single_user)
if single_user == nil then
single_user = not core.su
end
if single_user then
loader.setenv("boot_single", "YES")
else
loader.unsetenv("boot_single")
end
core.su = single_user
end
function core.getACPIPresent(checking_system_defaults)
local c = loader.getenv("hint.acpi.0.rsdp")
if c ~= nil then
if checking_system_defaults then
return true
end
-- Otherwise, respect disabled if it's set
c = loader.getenv("hint.acpi.0.disabled")
return c == nil or tonumber(c) ~= 1
end
return false
end
function core.setACPI(acpi)
if acpi == nil then
acpi = not core.acpi
end
if acpi then
loader.setenv("acpi_load", "YES")
loader.setenv("hint.acpi.0.disabled", "0")
loader.unsetenv("loader.acpi_disabled_by_user")
else
loader.unsetenv("acpi_load")
loader.setenv("hint.acpi.0.disabled", "1")
loader.setenv("loader.acpi_disabled_by_user", "1")
end
core.acpi = acpi
end
function core.setSafeMode(safe_mode)
if safe_mode == nil then
safe_mode = not core.sm
end
if safe_mode then
loader.setenv("kern.smp.disabled", "1")
loader.setenv("hw.ata.ata_dma", "0")
loader.setenv("hw.ata.atapi_dma", "0")
loader.setenv("hw.ata.wc", "0")
loader.setenv("hw.eisa_slots", "0")
loader.setenv("kern.eventtimer.periodic", "1")
loader.setenv("kern.geom.part.check_integrity", "0")
else
loader.unsetenv("kern.smp.disabled")
loader.unsetenv("hw.ata.ata_dma")
loader.unsetenv("hw.ata.atapi_dma")
loader.unsetenv("hw.ata.wc")
loader.unsetenv("hw.eisa_slots")
loader.unsetenv("kern.eventtimer.periodic")
loader.unsetenv("kern.geom.part.check_integrity")
end
core.sm = safe_mode
end
function core.clearCachedKernels()
-- Clear the kernel cache on config changes, autodetect might have
-- changed or if we've switched boot environments then we could have
-- a new kernel set.
core.cached_kernels = nil
end
function core.kernelList()
if core.cached_kernels ~= nil then
return core.cached_kernels
end
local k = loader.getenv("kernel")
local v = loader.getenv("kernels")
local autodetect = loader.getenv("kernels_autodetect") or ""
local kernels = {}
local unique = {}
local i = 0
if k ~= nil then
i = i + 1
kernels[i] = k
unique[k] = true
end
if v ~= nil then
for n in v:gmatch("([^; ]+)[; ]?") do
if unique[n] == nil then
i = i + 1
kernels[i] = n
unique[n] = true
end
end
end
-- Base whether we autodetect kernels or not on a loader.conf(5)
-- setting, kernels_autodetect. If it's set to 'yes', we'll add
-- any kernels we detect based on the criteria described.
if autodetect:lower() ~= "yes" then
core.cached_kernels = kernels
return core.cached_kernels
end
-- Automatically detect other bootable kernel directories using a
-- heuristic. Any directory in /boot that contains an ordinary file
-- named "kernel" is considered eligible.
for file in lfs.dir("/boot") do
local fname = "/boot/" .. file
if file == "." or file == ".." then
goto continue
end
if lfs.attributes(fname, "mode") ~= "directory" then
goto continue
end
if lfs.attributes(fname .. "/kernel", "mode") ~= "file" then
goto continue
end
if unique[file] == nil then
i = i + 1
kernels[i] = file
unique[file] = true
end
::continue::
end
core.cached_kernels = kernels
return core.cached_kernels
end
function core.bootenvDefault()
return loader.getenv("zfs_be_active")
end
function core.bootenvList()
local bootenv_count = tonumber(loader.getenv("bootenvs_count"))
local bootenvs = {}
local curenv
local envcount = 0
local unique = {}
if bootenv_count == nil or bootenv_count <= 0 then
return bootenvs
end
-- Currently selected bootenv is always first/default
curenv = core.bootenvDefault()
if curenv ~= nil then
envcount = envcount + 1
bootenvs[envcount] = curenv
unique[curenv] = true
end
for curenv_idx = 0, bootenv_count - 1 do
curenv = loader.getenv("bootenvs[" .. curenv_idx .. "]")
if curenv ~= nil and unique[curenv] == nil then
envcount = envcount + 1
bootenvs[envcount] = curenv
unique[curenv] = true
end
end
return bootenvs
end
function core.setDefaults()
core.setACPI(core.getACPIPresent(true))
core.setSafeMode(false)
core.setSingleUser(false)
core.setVerbose(false)
end
function core.autoboot(argstr)
-- loadelf() only if we've not already loaded a kernel
if loader.getenv("kernelname") == nil then
config.loadelf()
end
loader.perform(composeLoaderCmd("autoboot", argstr))
end
function core.boot(argstr)
-- loadelf() only if we've not already loaded a kernel
if loader.getenv("kernelname") == nil then
config.loadelf()
end
loader.perform(composeLoaderCmd("boot", argstr))
end
function core.isSingleUserBoot()
local single_user = loader.getenv("boot_single")
return single_user ~= nil and single_user:lower() == "yes"
end
function core.isUEFIBoot()
local efiver = loader.getenv("efi-version")
return efiver ~= nil
end
function core.isZFSBoot()
local c = loader.getenv("currdev")
if c ~= nil then
return c:match("^zfs:") ~= nil
end
return false
end
function core.isSerialBoot()
local c = loader.getenv("console")
if c ~= nil then
if c:find("comconsole") ~= nil then
return true
end
end
local s = loader.getenv("boot_serial")
if s ~= nil then
return true
end
local m = loader.getenv("boot_multicons")
if m ~= nil then
return true
end
return false
end
function core.isSystem386()
return loader.machine_arch == "i386"
end
-- Is the menu skipped in the environment in which we've booted?
function core.isMenuSkipped()
if core.isSerialBoot() then
return true
end
local c = string.lower(loader.getenv("console") or "")
if c:match("^efi[ ;]") ~= nil or c:match("[ ;]efi[ ;]") ~= nil then
return true
end
c = string.lower(loader.getenv("beastie_disable") or "")
return c == "yes"
end
-- This may be a better candidate for a 'utility' module.
function core.deepCopyTable(tbl)
local new_tbl = {}
for k, v in pairs(tbl) do
if type(v) == "table" then
new_tbl[k] = core.deepCopyTable(v)
else
new_tbl[k] = v
end
end
return new_tbl
end
-- XXX This should go away if we get the table lib into shape for importing.
-- As of now, it requires some 'os' functions, so we'll implement this in lua
-- for our uses
function core.popFrontTable(tbl)
-- Shouldn't reasonably happen
if #tbl == 0 then
return nil, nil
elseif #tbl == 1 then
return tbl[1], {}
end
local first_value = tbl[1]
local new_tbl = {}
-- This is not a cheap operation
for k, v in ipairs(tbl) do
if k > 1 then
new_tbl[k - 1] = v
end
end
return first_value, new_tbl
end
-- On i386, hint.acpi.0.rsdp will be set before we're loaded. On !i386, it will
-- generally be set upon execution of the kernel. Because of this, we can't (or
-- don't really want to) detect/disable ACPI on !i386 reliably. Just set it
-- enabled if we detect it and leave well enough alone if we don't.
if core.isSystem386() and core.getACPIPresent(false) then
core.setACPI(true)
end
hook.register("config.reloaded", core.clearCachedKernels)
return core