NetBSD/usr.sbin/etcupdate/etcupdate.8

.\"	$NetBSD: etcupdate.8,v 1.3 2003/01/24 13:08:22 wiz Exp $
.\"
.\" Copyright (c) 2001 The NetBSD Foundation, Inc.
.\" All rights reserved.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Martti Kuparinen.
.\"
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.\" modification, are permitted provided that the following conditions
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.Dd January 24, 2003
.Dt ETCUPDATE 8
.Os
.Sh NAME
.Nm etcupdate
.Nd update the configuration and startup files in
.Pa /etc
.Sh SYNOPSIS
.Nm
.Op Fl a
.Op Fl b Ar srcdir
.Op Fl h
.Op Fl p Ar pager
.Op Fl s Ar srcdir
.Op Fl t Ar temproot
.Op Fl v
.Op Fl w Ar width
.Sh DESCRIPTION
.Nm
is a tool to update the configuration and startup files in
.Pa /etc
(and some other directories like
.Pa /dev ,
.Pa /root
and
.Pa /var )
without the need of manually checking and modifying every file.
The user should run this script after performing an operating system
update (e.g. after running
.Pa make build
in
.Pa /usr/src
or after extracting the binary distribution files)
to use the latest configuration and startup files.
.Pp
If the user is updating from sources (which is the default mode),
.Nm
will first create a copy of the new configuration and startup files
by running
.Pa make distribution
in
.Pa /usr/src/etc .
.Pp
Instead of using sources, the user can also extract one or more binary
distribution sets and use those files to update the currently installed
files (see usage of the
.Fl b Ar srcdir
argument later in this manual page).
Files in
.Pa srcdir
will be removed by
.Nm
when using the
.Fl b Ar srcdir
argument (as the
.Pa srcdir
directory is treated like
.Pa temproot ) .
.Pp
.Nm
compares the new files against the currently installed files.
The user is given the option of installing, merging or deleting each
modified or missing file.
.Nm
also detects if the user installs certain special files and performs
corresponding tasks like remaking device nodes or rebuilding a database
from the
.Xr aliases 5
file.
.Pp
.Nm
can automatically update files which have not been modified locally.
The
.Fl a
flag instructs
.Nm
to store MD5 checksums in
.Pa /etc/etcupdate
and use these checksums to determine if there have been any
local modifications.
.Sh ENVIRONMENT
.Bl -tag -width TEMPROOT
.It Ev TEMPROOT
The temporary files created from
.Pa /usr/src/etc
will be stored here.  These files will then be compared
against the currently installed files in the
.Pa /etc
directory.  By default this is
.Pa /tmp/temproot
but it can be changed either with the
.Fl t Ar temproot
argument or by defining the
.Ev TEMPROOT
variable.
.It Ev SRCDIR
The location of the
.Nx
sources files.  By default this is
.Pa /usr/src/etc
but it can be changed either with the
.Fl s Ar srcdir
argument or by defining the
.Ev SRCDIR
variable.
.It Ev PAGER
The pager to use when displaying files.  By default this is
.Xr more 1
but it can be changed either with the
.Fl p Ar pager
argument or by defining the
.Ev PAGER
variable.
.It Ev WIDTH
The screen width used during interactive merge. By default this is
80 but it can be changed either with the
.Fl w Ar width
argument or by defining the
.Ev WIDTH
variable.
This is useful for
.Xr xterm 1
users with wider shell windows.
.El
.Sh FILES
The environment variables can also be defined in the following configuration
files.  The user's personal configuration file settings override the global
settings.
.Pp
/etc/etcupdate.conf
.Pp
~/.etcupdaterc
.Sh EXAMPLES
You have just upgraded your
.Nx
host from 1.6 to 1.6.1 and now it's time
to update the configuration files as well.
To update the configuration files from the sources (if you have the
.Pa /usr/src/etc
directory):
.Pp
.Dl etcupdate
.Pp
The default location of the source files is
.Pa /usr/src/etc
but this may be overridden with the
.Fl s Ar srcdir
command line argument:
.Pp
.Dl etcupdate -s /some/where/src/etc
.Pp
To update the configuration files from binary distribution sets
do something like this:
.Pp
.Dl mkdir /tmp/temproot
.Dl cd /tmp/temproot
.Dl tar xpzf /some/where/etc.tgz
.Dl etcupdate -b /tmp/temproot
.Pp
You have modified only few files in the
.Pa /etc
directory so you would like install most of the updates without being asked.
To automatically update the unmodified configuration files:
.Pp
.Dl etcupdate -a
.Pp
To get a better idea what's going on, use the
.Fl v
flag:
.Pp
.Dl etcupdate -v
.Sh HISTORY
The
.Nm
command appeared in
.Nx 1.6 .
.Sh AUTHORS
The
script was written by Martti Kuparinen <martti@netbsd.org> and
improved by several other
.Nx
users.
.Pp
The idea for this script (including code fragments, variable names etc.)
came from the
.Fx
mergemaster (by Douglas Barton).  Unlike the
.Fx
mergemaster, this does not use CVS version tags to compare if
the files need to be updated. Files are compared with
.Xr cmp 1
as this is more reliable and the only way if the version numbers are the
same even though the files are different.