309 lines
7.8 KiB
Groff
309 lines
7.8 KiB
Groff
.\" Copyright (c) 2011-2013 Devin Teske
|
|
.\" All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd Nov 20, 2013
|
|
.Dt SYSRC 8
|
|
.Os
|
|
.Sh NAME
|
|
.Nm sysrc
|
|
.Nd safely edit system rc files
|
|
.Sh SYNOPSIS
|
|
.Nm
|
|
.Op Fl cdDeFhinNqvx
|
|
.Op Fl f Ar file
|
|
.Op Fl j Ar jail | Fl R Ar dir
|
|
.Ar name Ns Op = Ns Ar value
|
|
.Ar ...
|
|
.Nm
|
|
.Op Fl cdDeFhinNqvx
|
|
.Op Fl f Ar file
|
|
.Op Fl j Ar jail | Fl R Ar dir
|
|
.Fl a | A
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
utility retrieves
|
|
.Xr rc.conf 5
|
|
variables from the collection of system rc files and allows processes with
|
|
appropriate privilege to change values in a safe and effective manner.
|
|
.Pp
|
|
The following options are available:
|
|
.Bl -tag -width indent+
|
|
.It Fl a
|
|
Dump a list of all non-default configuration variables.
|
|
.It Fl A
|
|
Dump a list of all configuration variables
|
|
.Pq incl. defaults .
|
|
.It Fl c
|
|
Check if the value will change when assigning a new value.
|
|
If verbose
|
|
.Pq see Dq Fl v
|
|
prints a message stating whether a change would occur.
|
|
Exits with success if no change is necessary, else returns error status.
|
|
.It Fl d
|
|
Print a description of the given variable.
|
|
.It Fl D
|
|
Show default value(s) only (this is the same as setting RC_CONFS to NULL or
|
|
passing `-f' with a NULL file-argument).
|
|
.It Fl e
|
|
Print query results as
|
|
.Xr sh 1
|
|
compatible syntax
|
|
.Pq for example, Ql var=value .
|
|
Ignored if either
|
|
.Ql Fl n
|
|
or
|
|
.Ql Fl F
|
|
is specified.
|
|
.It Fl f Ar file
|
|
Operate on the specified file(s) instead of the files obtained by reading the
|
|
.Sq rc_conf_files
|
|
entry in the
|
|
.Ev RC_DEFAULTS
|
|
file.
|
|
This option can be specified multiple times for additional files.
|
|
.It Fl F
|
|
Show only the last
|
|
.Xr rc.conf 5
|
|
file each directive is in.
|
|
.It Fl h
|
|
Print a short usage message to stderr and exit.
|
|
.It Fl -help
|
|
Print a full usage statement to stderr and exit.
|
|
.It Fl i
|
|
Ignore unknown variables.
|
|
.It Fl j Ar jail
|
|
The
|
|
.Ar jid
|
|
or name of the
|
|
.Ar jail
|
|
to operate within
|
|
.Pq overrides So Fl R Ar dir Sc ; requires Xr jexec 8 .
|
|
.It Fl n
|
|
Show only variable values, not their names.
|
|
.It Fl N
|
|
Show only variable names, not their values.
|
|
.It Fl q
|
|
Quiet.
|
|
Ignore previous occurrences of
|
|
.Fl v
|
|
flag.
|
|
.It Fl R Ar dir
|
|
Operate within the root directory
|
|
.Pq Sq Ar dir
|
|
rather than
|
|
.Pq Sq / .
|
|
.It Fl v
|
|
Verbose.
|
|
Print the pathname of the specific
|
|
.Xr rc.conf 5
|
|
file where the directive was found.
|
|
.It Fl -version
|
|
Print version information to stdout and exit.
|
|
.It Fl x
|
|
Remove variable(s) from specified file(s).
|
|
.El
|
|
.Pp
|
|
This utility works similar to
|
|
.Xr sysctl 8 .
|
|
It shares the `-e' and `-n' options
|
|
.Pq detailed above
|
|
and also has the same
|
|
.Ql name[=value]
|
|
syntax for querying/setting configuration options.
|
|
.Pp
|
|
However, while
|
|
.Xr sysctl 8
|
|
serves to query/modify MIBs in the entrant kernel,
|
|
.Nm
|
|
instead works on values in the system
|
|
.Xr rc.conf 5
|
|
configuration files.
|
|
.Pp
|
|
The list of system configuration files is configured in the file
|
|
.Ql /etc/defaults/rc.conf
|
|
within the variable
|
|
.Ql rc_conf_files ,
|
|
which by-default contains a space-separated list of pathnames.
|
|
On all FreeBSD
|
|
systems, this defaults to the value "/etc/rc.conf /etc/rc.conf.local".
|
|
Each
|
|
pathname is sourced in-order upon startup.
|
|
It is in the same fashion that
|
|
.Nm
|
|
sources the configuration files before returning the value of the given
|
|
variable.
|
|
.Pp
|
|
When supplied a variable name,
|
|
.Nm
|
|
will return the value of the variable.
|
|
If the variable does not appear in any
|
|
of the configured
|
|
.Ql rc_conf_files ,
|
|
an error is printed and error status is returned.
|
|
.Pp
|
|
When changing values of a given variable, it does not matter if the variable
|
|
appears in any of the
|
|
.Ql rc_conf_files
|
|
or not.
|
|
If the variable does not appear in any of the files, it is appended to
|
|
the end of the first pathname in the
|
|
.Ql rc_conf_files
|
|
variable.
|
|
Otherwise,
|
|
.Nm
|
|
will replace only the last-occurrence in the last-file found to contain the
|
|
variable.
|
|
This gets the value to take effect next boot without heavily
|
|
modifying these integral files (yet taking care not to allow the file to
|
|
grow unwieldy should
|
|
.Nm
|
|
be called repeatedly).
|
|
.Sh ENVIRONMENT
|
|
The following environment variables are referenced by
|
|
.Nm :
|
|
.Bl -tag -width ".Ev RC_DEFAULTS"
|
|
.It Ev RC_CONFS
|
|
Override default
|
|
.Ql rc_conf_files
|
|
.Pq even if set to NULL .
|
|
.It Ev RC_DEFAULTS
|
|
Location of
|
|
.Ql /etc/defaults/rc.conf
|
|
file.
|
|
.El
|
|
.Sh DEPENDENCIES
|
|
The following standard commands are required by
|
|
.Nm :
|
|
.Pp
|
|
.Xr awk 1 ,
|
|
.Xr cat 1 ,
|
|
.Xr chmod 1 ,
|
|
.Xr env 1 ,
|
|
.Xr grep 1 ,
|
|
.Xr jls 1 ,
|
|
.Xr mktemp 1 ,
|
|
.Xr mv 1 ,
|
|
.Xr rm 1 ,
|
|
.Xr sh 1 ,
|
|
.Xr stat 1 ,
|
|
.Xr tail 1 ,
|
|
.Xr chown 8
|
|
and
|
|
.Xr jexec 8 .
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /etc/defaults/rc.conf" -compact
|
|
.It Pa /etc/defaults/rc.conf
|
|
.It Pa /etc/rc.conf
|
|
.It Pa /etc/rc.conf.local
|
|
.El
|
|
.Sh EXAMPLES
|
|
Below are some simple examples of how
|
|
.Nm
|
|
can be used to query certain values from the
|
|
.Xr rc.conf 5
|
|
collection of system configuration files:
|
|
.Pp
|
|
.Nm
|
|
sshd_enable
|
|
.Dl returns the value of $sshd_enable, usually YES or NO .
|
|
.Pp
|
|
.Nm
|
|
defaultrouter
|
|
.Dl returns IP address of default router Pq if configured .
|
|
.Pp
|
|
Working on other files, such as
|
|
.Xr crontab 5 :
|
|
.Pp
|
|
.Nm
|
|
-f /etc/crontab MAILTO
|
|
.Dl returns the value of the MAILTO setting Pq if configured .
|
|
.Pp
|
|
In addition to the above syntax,
|
|
.Nm
|
|
also supports inline
|
|
.Xr sh 1
|
|
PARAMETER expansion for changing the way values are reported, shown below:
|
|
.Pp
|
|
.Nm
|
|
\&'hostname%%.*'
|
|
.Dl returns $hostname up to (but not including) first `.' .
|
|
.Pp
|
|
.Nm
|
|
\&'network_interfaces%%[$IFS]*'
|
|
.Dl returns first word of $network_interfaces .
|
|
.Pp
|
|
.Nm
|
|
\&'ntpdate_flags##*[$IFS]'
|
|
.Dl returns last word of $ntpdate_flags (time server address) .
|
|
.Pp
|
|
.Nm
|
|
usbd_flags-"default"
|
|
.Dl returns $usbd_flags or "default" if unset or NULL .
|
|
.Pp
|
|
.Nm
|
|
cloned_interfaces+"alternate"
|
|
.Dl returns "alternate" if $cloned_interfaces is set .
|
|
.Pp
|
|
.Nm
|
|
\&'#kern_securelevel'
|
|
.Dl returns length in characters of $kern_securelevel .
|
|
.Pp
|
|
.Nm
|
|
\&'hostname?'
|
|
.Dl returns NULL and error status 2 if $hostname is unset Pq or if set, returns the value of $hostname with no error status .
|
|
.Pp
|
|
.Nm
|
|
\&'hostname:?'
|
|
.Dl returns NULL and error status 2 if $hostname is unset or NULL Pq or if set and non-NULL, returns value without error status .
|
|
.Sh LIMITATIONS
|
|
The
|
|
.Nm
|
|
utility presently does not support the
|
|
.Ql rc.conf.d
|
|
collection of system configuration files
|
|
.Pq which requires a service name to be known during execution .
|
|
.Pp
|
|
This will be corrected by a future enhancement.
|
|
.Sh SEE ALSO
|
|
.Xr jls 1 ,
|
|
.Xr rc.conf 5 ,
|
|
.Xr jail 8 ,
|
|
.Xr jexec 8 ,
|
|
.Xr rc 8 ,
|
|
.Xr sysctl 8
|
|
.Sh HISTORY
|
|
A
|
|
.Nm
|
|
utility first appeared in
|
|
.Fx 9.2 .
|
|
.Sh AUTHORS
|
|
.An Devin Teske Aq dteske@FreeBSD.org
|
|
.Sh THANKS TO
|
|
Brandon Gooch, Garrett Cooper, Julian Elischer, Pawel Jakub Dawidek,
|
|
Cyrille Lefevre, Ross West, Stefan Esser, Marco Steinbach, and Jilles Tjoelker
|
|
for suggestions and help.
|