(get command) or if the current value is the same as what is desired (set command). In those cases, the return status is success. Otherwise, if the variable is unset (get command) or set to a different value that what is desired (set command), returns with error status. This is useful for puppet integration as well as everyday scripting.
306 lines
7.7 KiB
Groff
306 lines
7.7 KiB
Groff
.\" Copyright (c) 2011-2013 Devin Teske
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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 Nov 7, 2013
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.Dt SYSRC 8
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.Os
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.Sh NAME
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.Nm sysrc
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.Nd safely edit system rc files
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.Sh SYNOPSIS
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.Nm
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.Op Fl cdDeFhinNqvx
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.Op Fl f Ar file
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.Op Fl j Ar jail | Fl R Ar dir
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.Ar name Ns Op = Ns Ar value
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.Ar ...
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.Nm
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.Op Fl cdDeFhinNqvx
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.Op Fl f Ar file
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.Op Fl j Ar jail | Fl R Ar dir
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.Fl a | A
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.Sh DESCRIPTION
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The
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.Nm
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utility retrieves
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.Xr rc.conf 5
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variables from the collection of system rc files and allows processes with
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appropriate privilege to change values in a safe and effective manner.
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.Pp
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The following options are available:
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.Bl -tag -width indent+
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.It Fl a
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Dump a list of all non-default configuration variables.
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.It Fl A
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Dump a list of all configuration variables
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.Pq incl. defaults .
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.It Fl c
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Check if the value will change when assigning a new value.
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If verbose
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.Pq see Dq Fl v
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prints a message stating whether a change would occur.
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Exits with success if no change is necessary, else returns error status.
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.It Fl d
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Print a description of the given variable.
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.It Fl D
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Show default value(s) only (this is the same as setting RC_CONFS to NULL or
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passing `-f' with a NULL file-argument).
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.It Fl e
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Print query results as
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.Ql var=value
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.Pq useful for producing output to be fed back in .
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Ignored if
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.Fl n
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is specified.
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.It Fl f Ar file
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Operate on the specified file(s) instead of the files obtained by reading the
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.Sq rc_conf_files
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entry in the
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.Ev RC_DEFAULTS
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file.
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This option can be specified multiple times for additional files.
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.It Fl F
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Show only the last
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.Xr rc.conf 5
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file each directive is in.
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.It Fl h
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Print a short usage message to stderr and exit.
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.It Fl -help
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Print a full usage statement to stderr and exit.
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.It Fl i
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Ignore unknown variables.
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.It Fl j Ar jail
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The
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.Ar jid
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or name of the
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.Ar jail
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to operate within
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.Pq overrides So Fl R Ar dir Sc ; requires Xr jexec 8 .
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.It Fl n
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Show only variable values, not their names.
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.It Fl N
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Show only variable names, not their values.
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.It Fl q
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Quiet.
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Ignore previous occurrences of
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.Fl v
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flag.
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.It Fl R Ar dir
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Operate within the root directory
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.Pq Sq Ar dir
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rather than
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.Pq Sq / .
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.It Fl v
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Verbose.
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Print the pathname of the specific
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.Xr rc.conf 5
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file where the directive was found.
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.It Fl -version
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Print version information to stdout and exit.
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.It Fl x
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Remove variable(s) from specified file(s).
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.El
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.Pp
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This utility works similar to
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.Xr sysctl 8 .
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It shares the `-e' and `-n' options
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.Pq detailed above
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and also has the same
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.Ql name[=value]
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syntax for querying/setting configuration options.
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.Pp
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However, while
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.Xr sysctl 8
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serves to query/modify MIBs in the entrant kernel,
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.Nm
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instead works on values in the system
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.Xr rc.conf 5
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configuration files.
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.Pp
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The list of system configuration files is configured in the file
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.Ql /etc/defaults/rc.conf
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within the variable
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.Ql rc_conf_files ,
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which by-default contains a space-separated list of pathnames.
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On all FreeBSD
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systems, this defaults to the value "/etc/rc.conf /etc/rc.conf.local".
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Each
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pathname is sourced in-order upon startup.
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It is in the same fashion that
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.Nm
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sources the configuration files before returning the value of the given
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variable.
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.Pp
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When supplied a variable name,
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.Nm
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will return the value of the variable.
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If the variable does not appear in any
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of the configured
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.Ql rc_conf_files ,
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an error is printed and error status is returned.
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.Pp
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When changing values of a given variable, it does not matter if the variable
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appears in any of the
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.Ql rc_conf_files
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or not.
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If the variable does not appear in any of the files, it is appended to
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the end of the first pathname in the
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.Ql rc_conf_files
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variable.
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Otherwise,
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.Nm
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will replace only the last-occurrence in the last-file found to contain the
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variable.
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This gets the value to take effect next boot without heavily
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modifying these integral files (yet taking care not to allow the file to
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grow unwieldy should
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.Nm
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be called repeatedly).
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.Sh ENVIRONMENT
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The following environment variables are referenced by
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.Nm :
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.Bl -tag -width ".Ev RC_DEFAULTS"
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.It Ev RC_CONFS
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Override default
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.Ql rc_conf_files
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.Pq even if set to NULL .
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.It Ev RC_DEFAULTS
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Location of
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.Ql /etc/defaults/rc.conf
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file.
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.El
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.Sh DEPENDENCIES
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The following standard commands are required by
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.Nm :
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.Pp
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.Xr awk 1 ,
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.Xr cat 1 ,
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.Xr chmod 1 ,
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.Xr env 1 ,
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.Xr grep 1 ,
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.Xr jls 1 ,
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.Xr mktemp 1 ,
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.Xr mv 1 ,
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.Xr rm 1 ,
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.Xr sh 1 ,
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.Xr stat 1 ,
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.Xr tail 1 ,
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.Xr chown 8
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and
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.Xr jexec 8 .
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.Sh FILES
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.Bl -tag -width ".Pa /etc/defaults/rc.conf" -compact
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.It Pa /etc/defaults/rc.conf
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.It Pa /etc/rc.conf
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.It Pa /etc/rc.conf.local
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.El
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.Sh EXAMPLES
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Below are some simple examples of how
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.Nm
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can be used to query certain values from the
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.Xr rc.conf 5
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collection of system configuration files:
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.Pp
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.Nm
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sshd_enable
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.Dl returns the value of $sshd_enable, usually YES or NO .
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.Pp
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.Nm
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defaultrouter
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.Dl returns IP address of default router Pq if configured .
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.Pp
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Working on other files, such as
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.Xr crontab 5 :
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.Pp
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.Nm
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-f /etc/crontab MAILTO
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.Dl returns the value of the MAILTO setting Pq if configured .
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.Pp
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In addition to the above syntax,
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.Nm
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also supports inline
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.Xr sh 1
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PARAMETER expansion for changing the way values are reported, shown below:
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.Pp
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.Nm
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\&'hostname%%.*'
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.Dl returns $hostname up to (but not including) first `.' .
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.Pp
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.Nm
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\&'network_interfaces%%[$IFS]*'
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.Dl returns first word of $network_interfaces .
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.Pp
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.Nm
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\&'ntpdate_flags##*[$IFS]'
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.Dl returns last word of $ntpdate_flags (time server address) .
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.Pp
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.Nm
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usbd_flags-"default"
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.Dl returns $usbd_flags or "default" if unset or NULL .
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.Pp
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.Nm
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cloned_interfaces+"alternate"
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.Dl returns "alternate" if $cloned_interfaces is set .
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.Pp
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.Nm
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\&'#kern_securelevel'
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.Dl returns length in characters of $kern_securelevel .
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.Pp
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.Nm
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\&'hostname?'
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.Dl returns NULL and error status 2 if $hostname is unset Pq or if set, returns the value of $hostname with no error status .
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.Pp
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.Nm
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\&'hostname:?'
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.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 .
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.Sh LIMITATIONS
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The
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.Nm
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utility presently does not support the
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.Ql rc.conf.d
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collection of system configuration files
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.Pq which requires a service name to be known during execution .
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.Pp
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This will be corrected by a future enhancement.
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.Sh SEE ALSO
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.Xr jls 1 ,
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.Xr rc.conf 5 ,
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.Xr jail 8 ,
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.Xr jexec 8 ,
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.Xr rc 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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A
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.Nm
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utility first appeared in
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.Fx 9.2 .
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.Sh AUTHORS
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.An Devin Teske Aq dteske@FreeBSD.org
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.Sh THANKS TO
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Brandon Gooch, Garrett Cooper, Julian Elischer, Pawel Jakub Dawidek,
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Cyrille Lefevre, Ross West, Stefan Esser, Marco Steinbach, and Jilles Tjoelker
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for suggestions and help.
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