af876563d1
This command will trigger a reload of the configuration from disk. This is useful if you've changed currdev from recovery media to local disk as much as I have over the past ~2 hours and are tired of the extra keystrokes. This is really just a glorified shortcut, but reload-conf is likely easier to remember for other people and does save some keystrokes when reloading the configuration. It is also resilient to the underlying config method changing interface, but this is unlikely to happen. MFC after: 1 week
127 lines
4.0 KiB
Groff
127 lines
4.0 KiB
Groff
.\"
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.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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.\"
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.\" Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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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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.Dd September 13, 2019
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.Dt CLI.LUA 8
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.Os
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.Sh NAME
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.Nm cli.lua
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.Nd FreeBSD Lua CLI module
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.Sh DESCRIPTION
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.Nm
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contains the main functionality required to add new CLI commands, which can be
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executed at the loader prompt.
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.Pp
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Before hooking into the functionality provided by
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.Nm ,
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it must be included with a statement such as the following:
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.Pp
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.Dl local cli = require("cli")
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.Ss Adding new commands
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New loader commands may be created by adding functions to the object returned by
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requiring the
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.Nm
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module.
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.Pp
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For instance:
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.Pp
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.Bd -literal -offset indent -compact
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local cli = require("cli")
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cli.foo = function(...)
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-- Expand args to command name and the rest of argv. These arguments
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-- are pushed directly to the stack by loader, then handed off to
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-- cli_execute. cli_execute then passes them on to the invoked
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-- function, where they appear as varargs that must be peeled apart into
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-- their respective components.
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local _, argv = cli.arguments(...)
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print("This is the foo command!")
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for k, v in ipairs(argv) do
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print("arg #" .. tostring(k) .. ": '" .. v .. "'")
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end
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-- Perform a loader command directly. This will not get dispatched back
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-- to Lua, so it is acceptable to have a function of the exact same name
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-- in loader. Lua will have the first chance to handle any commands
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-- executed at the loader prompt.
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loader.perform("foo")
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end
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.Ed
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.Pp
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This function may be invoked by a user at the loader prompt by simply typing
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.Ic foo .
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Arguments may be passed to it as usual, space-delimited.
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.Ss Default Commands
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As of present, the
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.Nm
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module by default provides commands for
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.Ic autoboot ,
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.Ic boot ,
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.Ic boot-conf ,
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and
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.Ic reload-conf .
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.Pp
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For
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.Ic autoboot ,
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.Ic boot ,
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and
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.Ic boot-conf ,
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the
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.Xr core.lua 8
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module will load all ELF modules as-needed before executing the equivalent
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built-in loader commands.
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All non-kernel arguments to these commands are passed in the same order to the
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loader command.
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.Pp
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The
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.Ic reload-conf
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command will reload the configuration from disk.
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This is useful if you have manually changed currdev and would like to easily
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reload the configuration from the new device.
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.Ss Exported Functions
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The following functions are exported from
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.Nm :
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.Bl -tag -width cli.arguments -offset indent
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.It Fn cli.arguments ...
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Takes varargs passed on the stack from
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.Xr loader 8
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to
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.Ic cli_execute ,
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splits them out into two return values: the command name, traditionally argv[0],
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and the rest of argv.
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.El
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.Sh SEE ALSO
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.Xr loader.conf 5 ,
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.Xr core.lua 8 ,
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.Xr loader 8
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.Sh AUTHORS
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The
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.Nm
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file was originally written by
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.An Kyle Evans Aq Mt kevans@FreeBSD.org .
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