267 lines
8.0 KiB
Groff
267 lines
8.0 KiB
Groff
.\" $NetBSD: newbtconf.8,v 1.19 2005/09/30 20:18:12 rpaulo Exp $
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.\"
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.\" Copyright (c) 1999 Darren Reed. 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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.\" 3. Neither the name of the author nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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.Dd September 30, 2005
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.Dt NEWBTCONF 8
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.Os
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.Sh NAME
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.Nm newbtconf
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.Nd multiple boot-up configurations
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.Sh SYNOPSIS
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.Nm
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.Ar new-conf-name
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.Op Ar orig-conf-name
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.Nm
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.Cm init
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.Nm
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.Cm revert
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.Sh DESCRIPTION
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.Nm
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is used to set up the system in such a way that the user is offered a
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selection of environments in which to boot the system up into.
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The most obvious application being for laptops to provide a network
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and non-network environment after a successful boot into multi-user mode.
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.Ss Background
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In order to accomplish this task, the files usually associated with
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establishing the current system's running configuration are replaced with
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symbolic links which are adjusted with each boot to point to the appropriate
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file for the desired run-time environment.
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This is accomplished by directing all of the symbolic links through a
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directory which itself is a symbolic link
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.Pq Pa /etc/etc.current ,
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to the destination files.
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At each bootup, the selection made changes which directory
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.Pa /etc/etc.current
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points to.
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.Pp
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Through doing this and reloading
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.Pa /etc/rc.conf
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in
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.Pa /etc/rc
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after the link has
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been established, the resulting run-time configuration is effectively
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controlled without the need to directly edit any files.
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The default boot-up environment is selected by manually directing which
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configuration directory
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.Pa /etc/etc.default
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points to.
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As opposed to
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.Pa /etc/etc.current
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(which is updated
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with every boot),
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.Pa /etc/etc.default
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is not automatically updated.
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.Ss Getting Started
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By default,
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.Nx
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only has one boot-up configuration - that set in the
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file
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.Pa /etc/rc.conf .
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In order to initialize the system for operating in a
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manner which supports multiple boot configurations,
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.Nm
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must be run with an argument of
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.Sq init .
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This will create two symbolic links
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.Pa /etc/etc.current
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and
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.Pa /etc/etc.default
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to the directory
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.Pa /etc/etc.network .
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The following files are all moved into
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that directory and symbolic links put in their place, in
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.Pa /etc ,
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pointing to
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.Pa /etc/etc.current/\*[Lt]filename\*[Gt] :
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.Bd -literal -offset indent
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/etc/defaultdomain
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/etc/fstab
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/etc/ifconfig.*
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/etc/inetd.conf
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/etc/mrouted.conf
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/etc/mygate
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/etc/myname
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/etc/netstart
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/etc/nsswitch.conf
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/etc/ntp.conf
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/etc/rc.conf
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/etc/rc.conf.d
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/etc/resolv.conf
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.Ed
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.Pp
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To test that this has been performed correctly, reboot your system into
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.Nx .
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After the kernel has autoconfigured and tty flags have been set,
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a prompt should appear, preceded by the following like, looking like this:
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.Bd -literal
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[network]
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Which configuration [network] ?
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.Ed
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.Pp
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The []'s are used to indicate the default configuration, which can be
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selected by just pressing return.
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If there were other configurations available at this stage, you would
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have 30 seconds to enter that name and press
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.Sy RETURN .
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.Ss Multiple Configurations
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Once an initial configuration has been set up, we can proceed to set up further
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run time environments.
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This is done by invoking
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.Nm
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with the name of the new configuration to be created.
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By default, this step
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will use the current configuration files as the basis for this setup unless
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a second parameter is given - that of the configuration to use as the basis
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for the new one.
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Upon completion, a new directory,
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.Pa /etc/etc.\*[Lt]newname\*[Gt] ,
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will have been created,
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priming the directory with the appropriate files for editing.
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For example, if we do
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.Nm
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.Ar nonet network
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it would create a directory named
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.Pa /etc/etc.nonet
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and copy all the files from
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.Pa /etc/etc.network
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into that directory.
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Upon rebooting, we should see:
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.Bd -literal
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[network] nonet
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Which configuration [network] ?
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.Ed
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.Pp
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To set up the system for booting into the
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.Dq nonet
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configuration, the files in
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.Pa /etc/etc.nonet
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need be edited.
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.Pp
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If you wanted to make
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.Dq nonet
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the default configuration when booting, you
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would need delete the symbolic link
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.Pa /etc/etc.default
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and create a new symbolic link (with the same name) to
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.Pa /etc/etc.nonet .
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Booting up after having made such a change would
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result in the following being displayed:
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.Bd -literal
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network [nonet]
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Which configuration [nonet] ?
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.Ed
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.Ss \&No Network
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Assuming that we performed the above command successfully, in order to
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successfully configure
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.Nx
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to not configure interfaces (or generate no
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errors from attempting to do so), the following settings (at least) should
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be used in
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.Pa /etc/etc.nonet/rc.conf :
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.Bd -literal
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auto_ifconfig=NO
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net_interfaces=NO
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.Ed
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.Pp
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Of course other networking services, such as NTP, routed, etc, are all
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expected to be
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.Dq NO .
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In general, the only setting that should be
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.Dq YES
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is syslogd, and perhaps cron (if your cron scripts don't
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need the network) or screenblank/wscons (if applicable).
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Other actions such as deleting any NFS mounts from
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.Pa /etc/etc.nonet/fstab
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would also need to be undertaken.
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.Ss Reverting multiple boot configurations
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Multiple boot configurations can be deactivated by running
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.Nm
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with an argument of
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.Cm revert .
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All the symlinks mentioned above are then removed and the files they point to
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are copied to their default place.
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This effectively makes the currently selected
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configuration the only one active.
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The symbolic links
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.Pa /etc/etc.current
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and
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.Pa /etc/etc.default
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are also removed so upon rebooting no configuration selection menu is
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displayed.
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Note that the previously created configurations (in
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.Pa /etc/etc.\*[Lt]name\*[Gt] )
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are not removed.
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.Sh FILES
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.Bl -tag -width /etc/mrouted.current -compact
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.It Pa /etc/etc.current
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Symbolic link to current config directory.
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.It Pa /etc/etc.default
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Symbolic link to default config directory.
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.Pp
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.It Pa /etc/defaultdomain
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These files all become symbolic links.
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.It Pa /etc/fstab
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.It Pa /etc/ifconfig.*
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.It Pa /etc/inetd.conf
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.It Pa /etc/mrouted.conf
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.It Pa /etc/mygate
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.It Pa /etc/myname
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.It Pa /etc/netstart
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.It Pa /etc/nsswitch.conf
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.It Pa /etc/ntp.conf
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.It Pa /etc/rc.conf
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.It Pa /etc/rc.conf.d
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.It Pa /etc/resolv.conf
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.El
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.Sh SEE ALSO
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.Xr rc.conf 5 ,
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.Xr rc 8
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.Sh HISTORY
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The
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.Nm
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program first appeared in
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.Nx 1.5 .
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.Sh AUTHORS
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.An -nosplit
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This shell script was written by
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.An Darren Reed
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.Aq darrenr@NetBSD.org
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with initial input from
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.An Matthew Green
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.Aq mrg@NetBSD.org
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on how to approach this problem.
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.Sh BUGS
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It presently does not display a count down timer whilst waiting for input
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to select which configuration and nor does it abort said timer when a key
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is first pressed.
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.Pp
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The management of the overall collection of multiple configurations is much
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more manual than it ought to be.
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A general system configuration tool needs to be written to ease their
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management.
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