MFC r339677-r339678, r339702, r339805: Lualoader Bugfixes

r339677:
lualoader: unload upon kernel change if a kernel was previously loaded

In the majority of cases, a kernel is not loaded before we

MFC r339677-r339678, r339702, r339805: Lualoader Bugfixes

r339677:
lualoader: unload upon kernel change if a kernel was previously loaded

In the majority of cases, a kernel is not loaded before we hit the menu.
However, if a password is set, we'll trigger autoboot and have loadelf'd
beforehand. We also need to take into account one dropping to the loader
prompt and twiddling with things manually; if they try to toggle through
kernels, we'll assume they mean it.

r339678:
menu.lua: Abort autoboot sequence on failed command

Currently, a timeout in the menu autoboot sequence would effectively do
nothing. We would return from the autoboot handling, then begin processing
the menu without redrawing it.

This change makes the behavior a little more friendly. Returning the user to
the menu can't have any good effects, so abort the autoboot sequence and
drop to the loader prompt.

r339702:
lualoader: Improve module loading diagnostics

Some fixes:

- Maintain historical behavior more accurately w.r.t verbose_loading;
verbose_loading strictly prints "${module_name...}" and later "failed!"
or "ok" based on load success
- With or without verbose_loading, dump command_errbuf on load failure.
This usually happens prior to ok/failed if we're verbose_loading

r339805:
lualoader: Always return a proper dictionary for blacklist

If module_blacklist isn't specified, we have an empty blacklist; effectively
the same as if module_blacklist="" were specified in loader.conf(5).

This was reported when switching to a BE that predated the module_blacklist
introduction, but the problem is valid all the same and likely to be tripped
over in other scenarios.

Approved by: re (kib)

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lualoader: Expose loader.parse and add cli_execute_unparsed

This will be used for scenarios where the command to execute is coming in
via the environment (from, for example, loader.conf(5)) and is t

lualoader: Expose loader.parse and add cli_execute_unparsed

This will be used for scenarios where the command to execute is coming in
via the environment (from, for example, loader.conf(5)) and is thus not
necessarily trusted.

cli_execute_unparsed will immediately be used for handling
module_{before,after,error} as well as menu_timeout_command. We still want
to offer these variables the ability to execute Lua-intercepted loader
commands, but we don't want them to be able to execute arbitrary Lua.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D14580

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liblua: Add loader.interpret

This allows lua to pass back a command string to be executed as if it were
typed at the loader prompt- loader tries to execute the string first as pure
lua, then parses

liblua: Add loader.interpret

This allows lua to pass back a command string to be executed as if it were
typed at the loader prompt- loader tries to execute the string first as pure
lua, then parses it and gives lua a chance to intercept before it tries to
execute it itself.

This will be used to implement menu_timeout_command, among other things,
which *should* be used to execute basic loader commands independent of the
chosen interpreter.

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liblua: Use putc instead of printf for printc

printc does not need the features or the overhead of printf. It does not
take formatting strings, and it pipes the single string argument through an
"%s

liblua: Use putc instead of printf for printc

printc does not need the features or the overhead of printf. It does not
take formatting strings, and it pipes the single string argument through an
"%s" format.

Instead, use putc directly. This pipes the string through in its entirety as
a series of 'unsigned char's, generally straight to the console emulator.

Discussed with: tsoome

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lualoader: Register loader.printc as global printc

liblua: Implement write support

Write support (even if it only works on UFS) will be needed for nextboot
functionality.

Reviewed by: cem, imp
Differential Revision: https://reviews.freebsd.org/D144

liblua: Implement write support

Write support (even if it only works on UFS) will be needed for nextboot
functionality.

Reviewed by: cem, imp
Differential Revision: https://reviews.freebsd.org/D14478

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liblua: Add loader.machine and loader.machine_arch properties

Provisioned from MACHINE/MACHINE_ARCH on the system, expose loader.machine
and loader.machine_arch respectively.

These may be used to h

liblua: Add loader.machine and loader.machine_arch properties

Provisioned from MACHINE/MACHINE_ARCH on the system, expose loader.machine
and loader.machine_arch respectively.

These may be used to hide ACPI option on non-applicable archs.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D14446

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Implement loader.command

This is just like loader.perform, except it takes pre-parsed arguments.

Review: https://reviews.freebsd.org/D14448

liblua: Fix missing '}' in lutil.c after r329499

interp_lua: Register io/loader with regular Lua module system

Reviewed by: kevans
Sponsored by: Dell EMC Isilon
Differential Revision: https://reviews.freebsd.org/D14421

liblua: Clean up io/loader C module registration

Utilize registration APIs Lua provides to make module definition a little
cleaner.

Discussed with: imp
Sponsored by: Dell EMC Isilon

Add Lua as a scripting langauge to /boot/loader

liblua glues the lua run time into the boot loader. It implements all
the runtime routines that lua expects. In addition, it has a few
standard 'C' he

Add Lua as a scripting langauge to /boot/loader

liblua glues the lua run time into the boot loader. It implements all
the runtime routines that lua expects. In addition, it has a few
standard 'C' headers that nueter various aspects of the LUA build that
are too specific to lua to be in libsa. Many refinements from the
original code to improve implementation and the number of included lua
libraries. Use int64_t for lua_Number. Have "/boot/lua" be the default
module path. Numerous cleanups from the original GSoC project,
including hacking libsa to allow lua to be built with only one change
outside luaconf.h.

Add the final bit of lua glue to bring in liblua and plug into the
multiple interpreter framework, previously committed.

Add LOADER_LUA option, currently off by default.

Presently, this is an experimental option. One must opt-in to using
this by defining WITH_LOADER_LUA and WITHOUT_FORTH. It's been
lightly tested, so keep a backup copy of your old loader handy.
The menu code, coming in the next commit, hasn't been exhaustively
tested. A LUA boot loader is 60k larger than a FORTH one, which is
80k larger than a no-interpreter one. Subtle changes in size
may tip things past some subtle limit (the binary is ~430k now
when built with LUA). A future version may offer coexistance.

Bump FreeBSD version to 1200058 to mark the milestone.

Pedro Souza's 2014 Summer of Code project. Rui Paulo, Pedro Arthur,
Zakary Nafziger and Wojciech A. Koszek also contributed. Warner Losh
reworked it extensively into its current form.

Obtained from: https://wiki.freebsd.org/SummerOfCode2014/LuaLoader
Sponsored by: Google Summer of Code
Relnotes: Yes
MFC After: 1 month
Differential Review: https://reviews.freebsd.org/D14295

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