2a6a4a5861
kernel selection menu to the beastie menu. List of kernels is taken from `kernels' in loader.conf(5) as a space (or comma) separated list of names to display (up to 9). If not set, default value is "kernel kernel.old". Does not validate that kernels exist because the next enhancement will be to allow selection of the root device. Discussed on: -current MFC after: 3 days
227 lines
5.4 KiB
Groff
227 lines
5.4 KiB
Groff
.\" Copyright (c) 1999 Daniel C. Sobral
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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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.Dd October 17, 2013
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.Dt LOADER.4TH 8
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.Os
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.Sh NAME
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.Nm loader.4th
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.Nd loader.conf processing tools
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.Sh DESCRIPTION
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The file that goes by the name of
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.Nm
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is a set of commands designed to manipulate
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.Xr loader.conf 5
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files.
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The default
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.Pa /boot/loader.rc
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includes
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.Nm
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and uses one of its commands to automatically read and process
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the standard
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.Xr loader.conf 5
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files.
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Other commands exists to help the user specify alternate
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configurations.
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.Pp
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The commands of
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.Nm
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by themselves are not enough for most uses.
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Please refer to the
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examples below for the most common situations, and to
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.Xr loader 8
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for additional commands.
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.Pp
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Before using any of the commands provided in
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.Nm ,
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it must be included
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through the command:
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.Pp
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.Dl include loader.4th
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.Pp
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This line is present in the default
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.Pa /boot/loader.rc
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file, so it is not needed (and should not be re-issued) in a normal setup.
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.Pp
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The commands provided by it are:
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.Bl -tag -width disable-module_module -compact -offset indent
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.It Ic boot
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.It Ic boot Ar kernelname Op Cm ...
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.It Ic boot Ar directory Op Cm ...
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.It Ic boot Fl flag Cm ...
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Boot as specified by the
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.Xr loader.conf 5
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files read.
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.Pp
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Depending on the arguments passed, it can override boot flags and
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either the kernel name or the search path for kernel and modules.
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.Pp
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.It Ic boot-conf
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.It Ic boot-conf Ar kernelname Op Cm ...
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.It Ic boot-conf Ar directory Op Cm ...
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.It Ic boot-conf Fl flag Cm ...
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Works like
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.Ic boot
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described above, but instead of booting immediately, uses
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.Ic autoboot ,
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so it can be stopped.
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.Pp
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.It Ic start
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Reads
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.Pa /boot/defaults/loader.conf ,
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all other
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.Xr loader.conf 5
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files specified in it, then loads the desired kernel and modules
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.Pq if not already loaded .
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After which you can use the
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.Ic boot
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or
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.Ic autoboot
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commmands or simply exit (provided
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.Va autoboot_delay
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is not set to NO) to boot the system.
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.Ic start
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is the command used in the default
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.Pa /boot/loader.rc
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file
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.Pq see Xr loader 8 .
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.Pp
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.It Ic initialize
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Initialize the support library so commands can be used without executing
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.Ic start
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first.
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Like
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.Ic start ,
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it reads
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.Pa /boot/defaults/loader.conf
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and all other
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.Xr loader.conf 5
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files specified in it
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.Pq but does not load kernel or modules .
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Returns a flag on the stack to indicate
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if any configuration files were successfully loaded.
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.Pp
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.It Ic read-conf Ar filename
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Reads and processes a
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.Xr loader.conf 5
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file.
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Does not proceed to boot.
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.Pp
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.It Ic enable-module Ar module
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Enables the loading of
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.Ar module .
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.Pp
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.It Ic disable-module Ar module
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Disables the loading of
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.Ar module .
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.Pp
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.It Ic toggle-module Ar module
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Toggles the loading of
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.Ar module
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on and off.
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.Pp
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.It Ic show-module Ar module
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Shows the information gathered in the
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.Xr loader.conf 5
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files about the module
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.Ar module .
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.Pp
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.It Ic retry
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Used inside
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.Xr loader.conf 5
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files to specify the action after a module loading fails.
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.Pp
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.It Ic ignore
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Used inside
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.Xr loader.conf 5
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files to specify the action after a module loading fails.
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.El
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.Sh FILES
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.Bl -tag -width /boot/loader.4th -compact
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.It Pa /boot/loader
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The
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.Xr loader 8 .
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.It Pa /boot/loader.4th
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.Nm
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itself.
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.It Pa /boot/loader.rc
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.Xr loader 8
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bootstrapping script.
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.It Pa /boot/defaults/loader.conf
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File loaded by the
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.Ic start
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command.
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.El
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.Sh EXAMPLES
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Standard
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.Pa /boot/loader.rc :
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.Pp
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.Bd -literal -offset indent -compact
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include /boot/loader.4th
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start
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.Ed
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.Pp
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Load a different kernel with the standard configuration:
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.Pp
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.Bd -literal -offset indent -compact
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set kernel="kernel.old"
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unload
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boot-conf
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.Ed
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.Pp
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Read an additional configuration file and then proceed to boot:
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.Pp
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.Bd -literal -offset indent -compact
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unload
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read-conf /boot/special.conf
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boot-conf
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.Ed
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.Pp
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Disable the loading of the splash screen module and bitmap and then
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proceed to boot:
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.Pp
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.Bd -literal -offset indent -compact
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unload
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disable-module splash_bmp
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disable-module bitmap
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boot-conf
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.Ed
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.Sh SEE ALSO
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.Xr loader.conf 5 ,
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.Xr loader 8
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.Sh HISTORY
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The
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.Nm
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set of commands first appeared in
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.Fx 3.2 .
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.Sh AUTHORS
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The
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.Nm
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set of commands was written by
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.An Daniel C. Sobral Aq dcs@FreeBSD.org .
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.Sh BUGS
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A British espionage series.
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