bootonce feature is temporary, one time boot, activated by "bectl activate -t BE", "bectl activate -T BE" will reset the bootonce flag. By default, the bootonce setting is reset on attempt to boot and the next boot will use previously active BE. By setting zfs_bootonce_activate="YES" in rc.conf, the bootonce BE will be set permanently active. bootonce dataset name is recorded in boot pool labels, bootenv area. in case of nextboot, the nextboot_enable boolean variable is recorded in freebsd:nvstore nvlist, also stored in boot pool label bootenv area. On boot, the loader will process /boot/nextboot.conf if nextboot_enable is "YES", and will set nextboot_enable to "NO", preventing /boot/nextboot.conf processing on next boot. bootonce and nextboot features are usable in both UEFI and BIOS boot. To use bootonce/nextboot features, the boot loader needs to be updated on disk; if loader.efi is stored on ESP, then ESP needs to be updated and for BIOS boot, stage2 (zfsboot or gptzfsboot) needs to be updated (gpart or other tools). At this time, only lua loader is updated. Sponsored by: Netflix, Klara Inc. Differential Revision: https://reviews.freebsd.org/D25512
690 lines
18 KiB
Lua
690 lines
18 KiB
Lua
--
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-- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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--
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-- Copyright (c) 2015 Pedro Souza <pedrosouza@freebsd.org>
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-- Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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-- All rights reserved.
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--
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions
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-- are met:
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-- 1. Redistributions of source code must retain the above copyright
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-- notice, this list of conditions and the following disclaimer.
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-- 2. Redistributions in binary form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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-- THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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-- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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-- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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-- ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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-- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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-- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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-- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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-- SUCH DAMAGE.
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--
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-- $FreeBSD$
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--
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local hook = require("hook")
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local config = {}
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local modules = {}
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local carousel_choices = {}
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-- Which variables we changed
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local env_changed = {}
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-- Values to restore env to (nil to unset)
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local env_restore = {}
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local MSG_FAILEXEC = "Failed to exec '%s'"
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local MSG_FAILSETENV = "Failed to '%s' with value: %s"
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local MSG_FAILOPENCFG = "Failed to open config: '%s'"
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local MSG_FAILREADCFG = "Failed to read config: '%s'"
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local MSG_FAILPARSECFG = "Failed to parse config: '%s'"
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local MSG_FAILEXBEF = "Failed to execute '%s' before loading '%s'"
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local MSG_FAILEXAF = "Failed to execute '%s' after loading '%s'"
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local MSG_MALFORMED = "Malformed line (%d):\n\t'%s'"
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local MSG_DEFAULTKERNFAIL = "No kernel set, failed to load from module_path"
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local MSG_KERNFAIL = "Failed to load kernel '%s'"
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local MSG_XENKERNFAIL = "Failed to load Xen kernel '%s'"
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local MSG_XENKERNLOADING = "Loading Xen kernel..."
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local MSG_KERNLOADING = "Loading kernel..."
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local MSG_MODLOADING = "Loading configured modules..."
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local MSG_MODBLACKLIST = "Not loading blacklisted module '%s'"
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local MODULEEXPR = '([%w-_]+)'
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local QVALEXPR = "\"([%w%s%p]-)\""
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local QVALREPL = QVALEXPR:gsub('%%', '%%%%')
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local WORDEXPR = "([%w]+)"
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local WORDREPL = WORDEXPR:gsub('%%', '%%%%')
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-- Entries that should never make it into the environment; each one should have
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-- a documented reason for its existence, and these should all be implementation
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-- details of the config module.
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local loader_env_restricted_table = {
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-- loader_conf_files should be considered write-only, and consumers
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-- should not rely on any particular value; it's a loader implementation
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-- detail. Moreover, it's not a particularly useful variable to have in
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-- the kenv. Save the overhead, let it get fetched other ways.
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loader_conf_files = true,
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}
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local function restoreEnv()
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-- Examine changed environment variables
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for k, v in pairs(env_changed) do
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local restore_value = env_restore[k]
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if restore_value == nil then
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-- This one doesn't need restored for some reason
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goto continue
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end
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local current_value = loader.getenv(k)
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if current_value ~= v then
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-- This was overwritten by some action taken on the menu
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-- most likely; we'll leave it be.
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goto continue
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end
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restore_value = restore_value.value
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if restore_value ~= nil then
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loader.setenv(k, restore_value)
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else
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loader.unsetenv(k)
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end
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::continue::
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end
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env_changed = {}
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env_restore = {}
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end
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-- XXX This getEnv/setEnv should likely be exported at some point. We can save
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-- the call back into loader.getenv for any variable that's been set or
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-- overridden by any loader.conf using this implementation with little overhead
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-- since we're already tracking the values.
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local function getEnv(key)
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if loader_env_restricted_table[key] ~= nil or
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env_changed[key] ~= nil then
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return env_changed[key]
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end
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return loader.getenv(key)
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end
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local function setEnv(key, value)
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env_changed[key] = value
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if loader_env_restricted_table[key] ~= nil then
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return 0
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end
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-- Track the original value for this if we haven't already
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if env_restore[key] == nil then
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env_restore[key] = {value = loader.getenv(key)}
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end
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return loader.setenv(key, value)
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end
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-- name here is one of 'name', 'type', flags', 'before', 'after', or 'error.'
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-- These are set from lines in loader.conf(5): ${key}_${name}="${value}" where
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-- ${key} is a module name.
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local function setKey(key, name, value)
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if modules[key] == nil then
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modules[key] = {}
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end
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modules[key][name] = value
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end
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-- Escapes the named value for use as a literal in a replacement pattern.
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-- e.g. dhcp.host-name gets turned into dhcp%.host%-name to remove the special
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-- meaning.
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local function escapeName(name)
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return name:gsub("([%p])", "%%%1")
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end
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local function processEnvVar(value)
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for name in value:gmatch("${([^}]+)}") do
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local replacement = loader.getenv(name) or ""
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value = value:gsub("${" .. escapeName(name) .. "}", replacement)
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end
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for name in value:gmatch("$([%w%p]+)%s*") do
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local replacement = loader.getenv(name) or ""
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value = value:gsub("$" .. escapeName(name), replacement)
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end
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return value
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end
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local function checkPattern(line, pattern)
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local function _realCheck(_line, _pattern)
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return _line:match(_pattern)
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end
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if pattern:find('$VALUE') then
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local k, v, c
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k, v, c = _realCheck(line, pattern:gsub('$VALUE', QVALREPL))
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if k ~= nil then
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return k,v, c
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end
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return _realCheck(line, pattern:gsub('$VALUE', WORDREPL))
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else
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return _realCheck(line, pattern)
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end
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end
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-- str in this table is a regex pattern. It will automatically be anchored to
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-- the beginning of a line and any preceding whitespace will be skipped. The
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-- pattern should have no more than two captures patterns, which correspond to
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-- the two parameters (usually 'key' and 'value') that are passed to the
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-- process function. All trailing characters will be validated. Any $VALUE
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-- token included in a pattern will be tried first with a quoted value capture
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-- group, then a single-word value capture group. This is our kludge for Lua
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-- regex not supporting branching.
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--
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-- We have two special entries in this table: the first is the first entry,
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-- a full-line comment. The second is for 'exec' handling. Both have a single
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-- capture group, but the difference is that the full-line comment pattern will
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-- match the entire line. This does not run afoul of the later end of line
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-- validation that we'll do after a match. However, the 'exec' pattern will.
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-- We document the exceptions with a special 'groups' index that indicates
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-- the number of capture groups, if not two. We'll use this later to do
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-- validation on the proper entry.
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--
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local pattern_table = {
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{
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str = "(#.*)",
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process = function(_, _) end,
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groups = 1,
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},
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-- module_load="value"
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{
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str = MODULEEXPR .. "_load%s*=%s*$VALUE",
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process = function(k, v)
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if modules[k] == nil then
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modules[k] = {}
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end
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modules[k].load = v:upper()
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end,
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},
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-- module_name="value"
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{
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str = MODULEEXPR .. "_name%s*=%s*$VALUE",
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process = function(k, v)
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setKey(k, "name", v)
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end,
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},
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-- module_type="value"
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{
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str = MODULEEXPR .. "_type%s*=%s*$VALUE",
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process = function(k, v)
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setKey(k, "type", v)
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end,
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},
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-- module_flags="value"
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{
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str = MODULEEXPR .. "_flags%s*=%s*$VALUE",
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process = function(k, v)
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setKey(k, "flags", v)
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end,
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},
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-- module_before="value"
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{
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str = MODULEEXPR .. "_before%s*=%s*$VALUE",
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process = function(k, v)
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setKey(k, "before", v)
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end,
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},
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-- module_after="value"
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{
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str = MODULEEXPR .. "_after%s*=%s*$VALUE",
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process = function(k, v)
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setKey(k, "after", v)
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end,
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},
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-- module_error="value"
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{
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str = MODULEEXPR .. "_error%s*=%s*$VALUE",
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process = function(k, v)
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setKey(k, "error", v)
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end,
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},
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-- exec="command"
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{
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str = "exec%s*=%s*" .. QVALEXPR,
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process = function(k, _)
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if cli_execute_unparsed(k) ~= 0 then
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print(MSG_FAILEXEC:format(k))
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end
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end,
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groups = 1,
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},
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-- env_var="value"
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{
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str = "([%w%p]+)%s*=%s*$VALUE",
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process = function(k, v)
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if setEnv(k, processEnvVar(v)) ~= 0 then
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print(MSG_FAILSETENV:format(k, v))
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end
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end,
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},
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-- env_var=num
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{
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str = "([%w%p]+)%s*=%s*(-?%d+)",
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process = function(k, v)
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if setEnv(k, processEnvVar(v)) ~= 0 then
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print(MSG_FAILSETENV:format(k, tostring(v)))
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end
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end,
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},
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}
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local function isValidComment(line)
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if line ~= nil then
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local s = line:match("^%s*#.*")
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if s == nil then
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s = line:match("^%s*$")
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end
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if s == nil then
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return false
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end
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end
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return true
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end
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local function getBlacklist()
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local blacklist = {}
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local blacklist_str = loader.getenv('module_blacklist')
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if blacklist_str == nil then
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return blacklist
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end
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for mod in blacklist_str:gmatch("[;, ]?([%w-_]+)[;, ]?") do
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blacklist[mod] = true
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end
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return blacklist
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end
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local function loadModule(mod, silent)
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local status = true
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local blacklist = getBlacklist()
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local pstatus
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for k, v in pairs(mod) do
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if v.load ~= nil and v.load:lower() == "yes" then
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local module_name = v.name or k
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if blacklist[module_name] ~= nil then
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if not silent then
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print(MSG_MODBLACKLIST:format(module_name))
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end
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goto continue
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end
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if not silent then
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loader.printc(module_name .. "...")
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end
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local str = "load "
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if v.type ~= nil then
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str = str .. "-t " .. v.type .. " "
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end
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str = str .. module_name
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if v.flags ~= nil then
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str = str .. " " .. v.flags
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end
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if v.before ~= nil then
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pstatus = cli_execute_unparsed(v.before) == 0
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if not pstatus and not silent then
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print(MSG_FAILEXBEF:format(v.before, k))
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end
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status = status and pstatus
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end
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if cli_execute_unparsed(str) ~= 0 then
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-- XXX Temporary shim: don't break the boot if
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-- loader hadn't been recompiled with this
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-- function exposed.
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if loader.command_error then
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print(loader.command_error())
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end
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if not silent then
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print("failed!")
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end
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if v.error ~= nil then
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cli_execute_unparsed(v.error)
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end
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status = false
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elseif v.after ~= nil then
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pstatus = cli_execute_unparsed(v.after) == 0
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if not pstatus and not silent then
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print(MSG_FAILEXAF:format(v.after, k))
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end
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if not silent then
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print("ok")
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end
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status = status and pstatus
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end
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end
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::continue::
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end
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return status
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end
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local function readFile(name, silent)
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local f = io.open(name)
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if f == nil then
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if not silent then
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print(MSG_FAILOPENCFG:format(name))
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end
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return nil
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end
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local text, _ = io.read(f)
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-- We might have read in the whole file, this won't be needed any more.
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io.close(f)
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if text == nil and not silent then
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print(MSG_FAILREADCFG:format(name))
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end
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return text
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end
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local function checkNextboot()
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local nextboot_file = loader.getenv("nextboot_conf")
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local nextboot_enable = loader.getenv("nextboot_enable")
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if nextboot_file == nil then
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return
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end
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-- is nextboot_enable set in nvstore?
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if nextboot_enable == "NO" then
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return
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end
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local text = readFile(nextboot_file, true)
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if text == nil then
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return
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end
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if nextboot_enable == nil and
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text:match("^nextboot_enable=\"NO\"") ~= nil then
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-- We're done; nextboot is not enabled
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return
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end
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if not config.parse(text) then
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print(MSG_FAILPARSECFG:format(nextboot_file))
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end
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-- Attempt to rewrite the first line and only the first line of the
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-- nextboot_file. We overwrite it with nextboot_enable="NO", then
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-- check for that on load.
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-- It's worth noting that this won't work on every filesystem, so we
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-- won't do anything notable if we have any errors in this process.
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local nfile = io.open(nextboot_file, 'w')
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if nfile ~= nil then
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-- We need the trailing space here to account for the extra
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-- character taken up by the string nextboot_enable="YES"
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-- Or new end quotation mark lands on the S, and we want to
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-- rewrite the entirety of the first line.
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io.write(nfile, "nextboot_enable=\"NO\" ")
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io.close(nfile)
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end
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loader.setenv("nextboot_enable", "NO")
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end
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-- Module exports
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config.verbose = false
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-- The first item in every carousel is always the default item.
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function config.getCarouselIndex(id)
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return carousel_choices[id] or 1
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end
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function config.setCarouselIndex(id, idx)
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carousel_choices[id] = idx
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end
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-- Returns true if we processed the file successfully, false if we did not.
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-- If 'silent' is true, being unable to read the file is not considered a
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-- failure.
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function config.processFile(name, silent)
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if silent == nil then
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silent = false
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end
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local text = readFile(name, silent)
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if text == nil then
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return silent
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end
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return config.parse(text)
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end
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|
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-- silent runs will not return false if we fail to open the file
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function config.parse(text)
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local n = 1
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local status = true
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for line in text:gmatch("([^\n]+)") do
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if line:match("^%s*$") == nil then
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for _, val in ipairs(pattern_table) do
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local pattern = '^%s*' .. val.str .. '%s*(.*)';
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local cgroups = val.groups or 2
|
|
local k, v, c = checkPattern(line, pattern)
|
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if k ~= nil then
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-- Offset by one, drats
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|
if cgroups == 1 then
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c = v
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v = nil
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end
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|
|
if isValidComment(c) then
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val.process(k, v)
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goto nextline
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end
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break
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end
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end
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print(MSG_MALFORMED:format(n, line))
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status = false
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end
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::nextline::
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n = n + 1
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end
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return status
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end
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|
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function config.readConf(file, loaded_files)
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if loaded_files == nil then
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loaded_files = {}
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end
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|
|
if loaded_files[file] ~= nil then
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return
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end
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|
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print("Loading " .. file)
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|
|
-- The final value of loader_conf_files is not important, so just
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-- clobber it here. We'll later check if it's no longer nil and process
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-- the new value for files to read.
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setEnv("loader_conf_files", nil)
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|
|
-- These may or may not exist, and that's ok. Do a
|
|
-- silent parse so that we complain on parse errors but
|
|
-- not for them simply not existing.
|
|
if not config.processFile(file, true) then
|
|
print(MSG_FAILPARSECFG:format(file))
|
|
end
|
|
|
|
loaded_files[file] = true
|
|
|
|
-- Going to process "loader_conf_files" extra-files
|
|
local loader_conf_files = getEnv("loader_conf_files")
|
|
if loader_conf_files ~= nil then
|
|
for name in loader_conf_files:gmatch("[%w%p]+") do
|
|
config.readConf(name, loaded_files)
|
|
end
|
|
end
|
|
end
|
|
|
|
-- other_kernel is optionally the name of a kernel to load, if not the default
|
|
-- or autoloaded default from the module_path
|
|
function config.loadKernel(other_kernel)
|
|
local flags = loader.getenv("kernel_options") or ""
|
|
local kernel = other_kernel or loader.getenv("kernel")
|
|
|
|
local function tryLoad(names)
|
|
for name in names:gmatch("([^;]+)%s*;?") do
|
|
local r = loader.perform("load " .. name ..
|
|
" " .. flags)
|
|
if r == 0 then
|
|
return name
|
|
end
|
|
end
|
|
return nil
|
|
end
|
|
|
|
local function getModulePath()
|
|
local module_path = loader.getenv("module_path")
|
|
local kernel_path = loader.getenv("kernel_path")
|
|
|
|
if kernel_path == nil then
|
|
return module_path
|
|
end
|
|
|
|
-- Strip the loaded kernel path from module_path. This currently assumes
|
|
-- that the kernel path will be prepended to the module_path when it's
|
|
-- found.
|
|
kernel_path = escapeName(kernel_path .. ';')
|
|
return module_path:gsub(kernel_path, '')
|
|
end
|
|
|
|
local function loadBootfile()
|
|
local bootfile = loader.getenv("bootfile")
|
|
|
|
-- append default kernel name
|
|
if bootfile == nil then
|
|
bootfile = "kernel"
|
|
else
|
|
bootfile = bootfile .. ";kernel"
|
|
end
|
|
|
|
return tryLoad(bootfile)
|
|
end
|
|
|
|
-- kernel not set, try load from default module_path
|
|
if kernel == nil then
|
|
local res = loadBootfile()
|
|
|
|
if res ~= nil then
|
|
-- Default kernel is loaded
|
|
config.kernel_loaded = nil
|
|
return true
|
|
else
|
|
print(MSG_DEFAULTKERNFAIL)
|
|
return false
|
|
end
|
|
else
|
|
-- Use our cached module_path, so we don't end up with multiple
|
|
-- automatically added kernel paths to our final module_path
|
|
local module_path = getModulePath()
|
|
local res
|
|
|
|
if other_kernel ~= nil then
|
|
kernel = other_kernel
|
|
end
|
|
-- first try load kernel with module_path = /boot/${kernel}
|
|
-- then try load with module_path=${kernel}
|
|
local paths = {"/boot/" .. kernel, kernel}
|
|
|
|
for _, v in pairs(paths) do
|
|
loader.setenv("module_path", v)
|
|
res = loadBootfile()
|
|
|
|
-- succeeded, add path to module_path
|
|
if res ~= nil then
|
|
config.kernel_loaded = kernel
|
|
if module_path ~= nil then
|
|
loader.setenv("module_path", v .. ";" ..
|
|
module_path)
|
|
loader.setenv("kernel_path", v)
|
|
end
|
|
return true
|
|
end
|
|
end
|
|
|
|
-- failed to load with ${kernel} as a directory
|
|
-- try as a file
|
|
res = tryLoad(kernel)
|
|
if res ~= nil then
|
|
config.kernel_loaded = kernel
|
|
return true
|
|
else
|
|
print(MSG_KERNFAIL:format(kernel))
|
|
return false
|
|
end
|
|
end
|
|
end
|
|
|
|
function config.selectKernel(kernel)
|
|
config.kernel_selected = kernel
|
|
end
|
|
|
|
function config.load(file, reloading)
|
|
if not file then
|
|
file = "/boot/defaults/loader.conf"
|
|
end
|
|
|
|
config.readConf(file)
|
|
|
|
checkNextboot()
|
|
|
|
local verbose = loader.getenv("verbose_loading") or "no"
|
|
config.verbose = verbose:lower() == "yes"
|
|
if not reloading then
|
|
hook.runAll("config.loaded")
|
|
end
|
|
end
|
|
|
|
-- Reload configuration
|
|
function config.reload(file)
|
|
modules = {}
|
|
restoreEnv()
|
|
config.load(file, true)
|
|
hook.runAll("config.reloaded")
|
|
end
|
|
|
|
function config.loadelf()
|
|
local xen_kernel = loader.getenv('xen_kernel')
|
|
local kernel = config.kernel_selected or config.kernel_loaded
|
|
local status
|
|
|
|
if xen_kernel ~= nil then
|
|
print(MSG_XENKERNLOADING)
|
|
if cli_execute_unparsed('load ' .. xen_kernel) ~= 0 then
|
|
print(MSG_XENKERNFAIL:format(xen_kernel))
|
|
return false
|
|
end
|
|
end
|
|
print(MSG_KERNLOADING)
|
|
if not config.loadKernel(kernel) then
|
|
return false
|
|
end
|
|
hook.runAll("kernel.loaded")
|
|
|
|
print(MSG_MODLOADING)
|
|
status = loadModule(modules, not config.verbose)
|
|
hook.runAll("modules.loaded")
|
|
return status
|
|
end
|
|
|
|
hook.registerType("config.loaded")
|
|
hook.registerType("config.reloaded")
|
|
hook.registerType("kernel.loaded")
|
|
hook.registerType("modules.loaded")
|
|
return config
|