1.\" $NetBSD: newbtconf.8,v 1.18 2004/08/31 17:08:06 uwe Exp $ 2.\" $DragonFly: src/sbin/newbtconf/newbtconf.8,v 1.3 2005/07/02 21:05:56 swildner Exp $ 3.\" 4.\" Copyright (c) 1999 Darren Reed. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the author nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.Dd January 6, 2003 31.Dt NEWBTCONF 8 32.Os 33.Sh NAME 34.Nm newbtconf 35.Nd multiple boot-up configurations 36.Sh SYNOPSIS 37.Nm 38.Ar new-conf-name 39.Op Ar orig-conf-name 40.Nm 41.Cm init 42.Nm 43.Cm revert 44.Sh DESCRIPTION 45.Nm 46is used to set up the system in such a way that the user is offered a 47selection of environments in which to boot the system up into. 48The most obvious application being for laptops to provide a network 49and non-network environment after a successful boot into multi-user mode. 50.Ss Background 51In order to accomplish this task, the files usually associated with 52establishing the current system's running configuration are replaced with 53symbolic links which are adjusted with each boot to point to the appropriate 54file for the desired run-time environment. 55This is accomplished by directing all of the symbolic links through a 56directory which itself is a symbolic link 57.Pq Pa /etc/etc.current , 58to the destination files. 59At each bootup, the selection made changes which directory 60.Pa /etc/etc.current 61points to. 62.Pp 63Through doing this and reloading 64.Pa /etc/rc.conf 65in 66.Pa /etc/rc 67after the link has 68been established, the resulting run-time configuration is effectively 69controlled without the need to directly edit any files. 70The default boot-up environment is selected by manually directing which 71configuration directory 72.Pa /etc/etc.default 73points to. 74As opposed to 75.Pa /etc/etc.current 76(which is updated 77with every boot), 78.Pa /etc/etc.default 79is not automatically updated. 80.Ss Getting Started 81By default, 82.Dx 83only has one boot-up configuration - that set in the 84file 85.Pa /etc/rc.conf . 86In order to initialize the system for operating in a 87manner which supports multiple boot configurations, 88.Nm 89must be run with an argument of 90.Sq init . 91This will create two symbolic links 92.Pa /etc/etc.current 93and 94.Pa /etc/etc.default 95to the directory 96.Pa /etc/etc.network . 97The following files are all moved into 98that directory and symbolic links put in their place, in 99.Pa /etc , 100pointing to 101.Pa /etc/etc.current/\*[Lt]filename\*[Gt] : 102.Bd -literal -offset indent 103/etc/defaultdomain 104/etc/dntpd.conf 105/etc/fstab 106/etc/ifconfig.* 107/etc/inetd.conf 108/etc/mrouted.conf 109/etc/mygate 110/etc/myname 111/etc/netstart 112/etc/nsswitch.conf 113/etc/ntpd.conf 114/etc/rc.conf 115/etc/rc.conf.d 116/etc/resolv.conf 117.Ed 118.Pp 119To test that this has been performed correctly, reboot your system into 120.Dx . 121After the kernel has autoconfigured and tty flags have been set, 122a prompt should appear, preceded by the following like, looking like this: 123.Bd -literal 124[network] 125Which configuration [network] ? 126.Ed 127.Pp 128The []'s are used to indicate the default configuration, which can be 129selected by just pressing return. 130If there were other configurations available at this stage, you would 131have 30 seconds to enter that name and press 132.Sy RETURN . 133.Ss Multiple Configurations 134Once an initial configuration has been set up, we can proceed to set up further 135run time environments. 136This is done by invoking 137.Nm 138with the name of the new configuration to be created. 139By default, this step 140will use the current configuration files as the basis for this setup unless 141a second parameter is given - that of the configuration to use as the basis 142for the new one. 143Upon completion, a new directory, 144.Pa /etc/etc.\*[Lt]newname\*[Gt] , 145will have been created, 146priming the directory with the appropriate files for editing. 147For example, if we do 148.Nm 149.Ar nonet network 150it would create a directory named 151.Pa /etc/etc.nonet 152and copy all the files from 153.Pa /etc/etc.network 154into that directory. 155Upon rebooting, we should see: 156.Bd -literal 157[network] nonet 158Which configuration [network] ? 159.Ed 160.Pp 161To set up the system for booting into the 162.Dq nonet 163configuration, the files in 164.Pa /etc/etc.nonet 165need be edited. 166.Pp 167If you wanted to make 168.Dq nonet 169the default configuration when booting, you 170would need delete the symbolic link 171.Pa /etc/etc.default 172and create a new symbolic link (with the same name) to 173.Pa /etc/etc.nonet . 174Booting up after having made such a change would 175result in the following being displayed: 176.Bd -literal 177network [nonet] 178Which configuration [nonet] ? 179.Ed 180.Ss \&No Network 181Assuming that we performed the above command successfully, in order to 182successfully configure 183.Dx 184to not configure interfaces (or generate no 185errors from attempting to do so), the following settings (at least) should 186be used in 187.Pa /etc/etc.nonet/rc.conf : 188.Bd -literal 189auto_ifconfig=NO 190net_interfaces=NO 191.Ed 192.Pp 193Of course other networking services, such as NTP, routed, etc, are all 194expected to be 195.Dq NO . 196In general, the only setting that should be 197.Dq YES 198is syslogd, and perhaps cron (if your cron scripts don't 199need the network) or screenblank/wscons (if applicable). 200Other actions such as deleting any NFS mounts from 201.Pa /etc/etc.nonet/fstab 202would also need to be undertaken. 203.Ss Reverting multiple boot configurations 204Multiple boot configurations can be deactivated by running 205.Nm 206with an argument of 207.Cm revert . 208All the symlinks mentioned above are then removed and the files they point to 209are copied to their default place. 210This effectively makes the currently selected 211configuration the only one active. 212The symbolic links 213.Pa /etc/etc.current 214and 215.Pa /etc/etc.default 216are also removed so upon rebooting no configuration selection menu is 217displayed. 218Note that the previously created configurations (in 219.Pa /etc/etc.\*[Lt]name\*[Gt] ) 220are not removed. 221.Sh FILES 222.Bl -tag -width /etc/mrouted.current -compact 223.It Pa /etc/etc.current 224Symbolic link to current config directory. 225.It Pa /etc/etc.default 226Symbolic link to default config directory. 227.Pp 228.It Pa /etc/defaultdomain 229These files all become symbolic links. 230.It Pa /etc/dntpd.conf 231.It Pa /etc/fstab 232.It Pa /etc/ifconfig.* 233.It Pa /etc/inetd.conf 234.It Pa /etc/mrouted.conf 235.It Pa /etc/mygate 236.It Pa /etc/myname 237.It Pa /etc/netstart 238.It Pa /etc/nsswitch.conf 239.It Pa /etc/ntpd.conf 240.It Pa /etc/rc.conf 241.It Pa /etc/rc.conf.d 242.It Pa /etc/resolv.conf 243.El 244.Sh SEE ALSO 245.Xr rc.conf 5 , 246.Xr rc 8 247.Sh HISTORY 248The 249.Nm 250program first appeared in 251.Nx 1.5 . 252.Sh AUTHORS 253This shell script was written by 254.An Darren Reed 255.Aq darrenr@NetBSD.org 256with initial input from 257.An Matthew Green 258.Aq mrg@NetBSD.org 259on how to approach this problem. 260.Sh BUGS 261It presently does not display a count down timer whilst waiting for input 262to select which configuration and nor does it abort said timer when a key 263is first pressed. 264.Pp 265The management of the overall collection of multiple configurations is much 266more manual than it ought to be. 267A general system configuration tool needs to be written to ease their 268management. 269