584 lines
12 KiB
Groff
584 lines
12 KiB
Groff
.\" $NetBSD: rc.subr.8,v 1.3 2002/02/25 13:16:45 wiz Exp $
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.\"
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.\" Copyright (c) 2002 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Luke Mewburn.
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd February 25, 2002
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.Dt RC.SUBR 8
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.Os
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.Sh NAME
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.Nm rc.subr
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.Nd functions used by system shell scripts
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.Sh SYNOPSIS
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.Bl -item
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.It
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.Li . /etc/rc.subr
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.It
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.Ic backup_file Ar action Ar file Ar current Ar backup
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.It
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.Ic checkyesno Ar var
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.It
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.Ic check_pidfile Ar pidfile Ar procname
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.It
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.Ic check_process Ar procname
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.It
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.Ic err Ar exitval Ar message
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.It
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.Ic load_rc_config Ar command
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.It
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.Ic mount_critical_filesystems Ar type
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.It
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.Ic rc_usage Ar command Op Ar ...
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.It
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.Ic reverse_list Ar item Op Ar ...
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.It
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.Ic run_rc_command Ar arg
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.It
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.Ic run_rc_script Ar file Ar arg
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.It
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.Ic wait_for_pids Op Ar pid Op Ar ...
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.It
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.Ic warn Ar message
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.El
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.Sh DESCRIPTION
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.Nm
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contains commonly used shell script functions which are used by
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various scripts such as
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.Xr rc 8 ,
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and the periodic system services which are controlled by
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.Xr daily.conf 5 ,
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.Xr monthly.conf 5 ,
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.Xr security.conf 5 ,
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and
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.Xr weekly.conf 5 .
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.Pp
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The
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.Nm
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functions are accessed by sourcing
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.Pa /etc/rc.subr
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into the current shell.
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.Pp
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The following shell functions are available:
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.Bl -tag -width 4n
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.It Xo
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.Ic backup_file Ar action Ar file Ar current Ar backup
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.Xc
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Make a backup copy of
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.Ar file
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into
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.Ar current .
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If the
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.Xr rc.conf 5
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variable
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.Sy backup_uses_rcs
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is
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.Sq YES ,
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use
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.Xr rcs 1
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to archive the previous version of
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.Ar current ,
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otherwise save the previous version of
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.Ar current
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as
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.Ar backup .
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.Pp
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.Ar action
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may be one of the following:
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.Bl -tag -width remove
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.It Sy add
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.Ar file
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is now being backed up by or possibly re-entered into this backup mechanism.
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.Ar current
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is created, and if necessary, the
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.Xr rcs 1
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files are created as well.
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.It Sy update
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.Ar file
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has changed and needs to be backed up.
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If
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.Ar current
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exists, it is copied to
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.Ar backup
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or checked into
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.Xr rcs 1
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(if the repository file is old),
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and then
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.Ar file
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is copied to
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.Ar current .
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.It Sy remove
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.Ar file
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is no longer being tracked by this backup mechanism.
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If
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.Xr rcs 1
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is being used, an empty file is checked in and
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.Ar current
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is removed,
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otherwise
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.Ar current
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is moved to
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.Ar backup .
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.El
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.It Ic checkyesno Ar var
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Return 0 if
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.Ar var
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is defined to
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.Sq YES ,
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.Sq TRUE ,
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.Sq ON ,
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or
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.Sq 1 .
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Return 1 if
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.Ar var
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is defined to
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.Sq NO ,
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.Sq FALSE ,
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.Sq OFF ,
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or
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.Sq 0 .
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Otherwise, warn that
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.Ar var
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is not set correctly.
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The values are case insensitive.
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.It Ic check_pidfile Ar pidfile Ar procname
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Parses the first word of the first line of
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.Ar pidfile
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for a PID, and ensures that the process with that PID
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is running and its first argument matches
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.Ar procname .
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Prints the matching PID if successfully, otherwise nothing.
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.It Ic check_process Ar procname
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Prints the PIDs of any processes that are running with a first
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argument that matches
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.Ar procname .
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.It Ic err Ar exitval Ar message
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Display an error message to
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.Em stderr ,
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log it to the system log
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using
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.Xr logger 1 ,
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and
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.Cm exit
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with an exit value of
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.Ar exitval .
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The error message consists of the script name
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(from
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.Va $0 ) ,
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followed by
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.Dq ": ERROR: " ,
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and then
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.Ar message .
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.It Ic load_rc_config Ar command
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Source in the configuration files for
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.Ar command .
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First,
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.Pa /etc/rc.conf
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is sourced if it has not yet been read in.
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Then,
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.Pa /etc/rc.conf.d/ Ns Ar command
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is sourced if it is an existing file.
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The latter may also contain other variable assignments to override
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.Ic run_rc_command
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arguments defined by the calling script, to provide an easy
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mechanism for an administrator to override the behaviour of a given
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.Xr rc.d 8
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script without requiring the editing of that script.
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.It Ic mount_critical_filesystems Ar type
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Go through a list of critical file systems, mounting each one that
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is not currently mounted.
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If
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.Ar type
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is
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.Sq local ,
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use the
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.Xr rc.conf 5
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variable
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.Sy critical_filesystems_beforenet
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for the list of critical file systems.
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Otherwise
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(where
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.Ar type
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should be
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.Sq remote ) ,
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use
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.Sy critical_filesystems .
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.It Ic rc_usage Ar command Op Ar ...
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Print a usage message for
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.Va $0 ,
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with
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.Ar commands
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being the list of valid arguments
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prefixed by
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.Dq "[fast|force]" .
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.It Ic reverse_list Ar item Op Ar ...
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Print the list of
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.Ar items
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in reverse order.
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.It Ic run_rc_command Ar arg
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Run the
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.Ar arg
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|
method for the current
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.Xr rc.d 8
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script, based on the settings of various shell variables.
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.Ic run_rc_command
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is extremely flexible, and allows fully functional
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.Xr rc.d 8
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scripts to be implemented in a small amount of shell code.
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.Pp
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.Ar arg
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is searched for in the list of supported commands, which may be one
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of:
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.Dl start stop restart rcvar
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as well as any word listed in the optional variable
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.Sy extra_commands .
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If
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.Sy pidfile
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or
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.Sy procname
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is set, also allow:
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.Dl status poll
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.Pp
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.Ar arg
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may have one of the following prefixes which alters its operation:
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.Bl -tag -width "Prefix" -offset indent -compact
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.It Sy Prefix
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.Sy Operation
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.It Li fast
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|
Skip the check for an existing running process.
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|
.It Li force
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|
Skip the checks for
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.Sy rcvar
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being set,
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ignore
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.Ar arg Ns Sy _precmd
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returning non-zero, and ignore any of the
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.Sy required_*
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tests failing .
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.El
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.Pp
|
|
.Ic run_rc_command
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|
uses the following shell variables to control its behaviour.
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|
Unless otherwise stated, these are optional.
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.Bl -tag -width procname -offset indent
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.It Sy name
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The name of this script.
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This is not optional.
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.It Sy rcvar
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The value of
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.Sy rcvar
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is checked with
|
|
.Ic checkyesno
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to determine if this method should be run.
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.It Sy command
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Full path to the command.
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|
Not required if
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.Ar arg Ns Sy _cmd
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|
is defined for each supported keyword.
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|
.It Sy command_args
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|
Optional arguments and/or shell directives for
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.Sy command .
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.It Sy extra_commands
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Extra commands/keywords/arguments supported.
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|
.It Sy pidfile
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Path to pid file.
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|
Used to determine the PID(s) of the running command.
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|
If
|
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.Sy pidfile
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is set, use
|
|
.Dl check_pidfile $pidfile $procname
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|
to find the PID.
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|
Otherwise, if
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.Sy command
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|
is set, use
|
|
.Dl check_process $procname
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|
to find the PID.
|
|
.It Sy procname
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|
Process name to check for.
|
|
Defaults to the value of
|
|
.Sy command .
|
|
.It Sy required_dirs
|
|
Check for the existence of the listed directories
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|
before running the default start method.
|
|
.It Sy required_files
|
|
Check for the readability of the listed files
|
|
before running the default start method.
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|
.It Sy required_vars
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Perform
|
|
.Ic checkyesno
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on each of the list variables
|
|
before running the default start method.
|
|
.It Sy ${name}_chdir
|
|
Directory to
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.Ic cd
|
|
to before running
|
|
.Sy command ,
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|
if
|
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.Sy ${name}_chroot
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|
is not provided.
|
|
.It Sy ${name}_chroot
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|
Directory to
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.Xr chroot 8
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|
to before running
|
|
.Sy command .
|
|
Only supported after
|
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.Pa /usr
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is mounted.
|
|
.It Sy ${name}_flags
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Arguments to call
|
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.Sy command
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with.
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|
This is usually set in
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.Xr rc.conf 5 ,
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|
and not in the
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.Xr rc.d 8
|
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script.
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|
The environment variable
|
|
.Sq Ev flags
|
|
can be used to override this.
|
|
.It Sy ${name}_nice
|
|
.Xr nice 1
|
|
level to run
|
|
.Sy command
|
|
as.
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|
Only supported after
|
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.Pa /usr
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is mounted.
|
|
.It Sy ${name}_user
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User to run
|
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.Sy command
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|
as, using
|
|
.Xr chroot 8 .
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|
if
|
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.Sy ${name}_chroot
|
|
is set, otherwise
|
|
uses
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.Xr su 1 .
|
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Only supported after
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.Pa /usr
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is mounted.
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.It Sy ${name}_group
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|
Group to run the chrooted
|
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.Sy command
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as.
|
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.It Sy ${name}_groups
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|
Comma separated list of supplementary groups to run the chrooted
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.Sy command
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with.
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.It Ar arg Ns Sy _cmd
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Shell commands which override the default method for
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.Ar arg .
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.It Ar arg Ns Sy _precmd
|
|
Shell commands to run just before running
|
|
.Ar arg Ns Sy _cmd
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|
or the default method for
|
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.Ar arg .
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If this returns a non-zero exit code, the method is not performed.
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|
If the default method is being executed, this check is performed after
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the
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.Sy required_*
|
|
checks and process (non-)existence checks.
|
|
.It Sy sig_stop
|
|
Signal to send the processes to stop in the default
|
|
.Sy stop
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|
method.
|
|
Defaults to
|
|
.Dv SIGTERM .
|
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.It Sy sig_reload
|
|
Signal to send the processes to reload in the default
|
|
.Sy reload
|
|
method.
|
|
Defaults to
|
|
.Dv SIGHUP .
|
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.El
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.Pp
|
|
For a given method
|
|
.Ar arg ,
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|
if
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.Ar arg Ns Sy _cmd
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|
is not defined, then a default method is provided by
|
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.Sy run_rc_command :
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|
.Bl -tag -width "argument" -offset indent
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|
.It Sy Argument
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|
.Sy Default method
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|
.It Sy start
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If
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.Sy command
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is not running and
|
|
.Ic checkyesno Sy rcvar
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succeeds, start
|
|
.Sy command .
|
|
.It Sy stop
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|
Determine the PIDs of
|
|
.Sy command
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with
|
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.Ic check_pidfile
|
|
or
|
|
.Ic check_process
|
|
(as appropriate),
|
|
.Ic kill Sy sig_stop
|
|
those PIDs, and run
|
|
.Ic wait_for_pids
|
|
on those PIDs.
|
|
.It Sy reload
|
|
Similar to
|
|
.Sy stop ,
|
|
except that it uses
|
|
.Sy sig_reload
|
|
instead, and doesn't run
|
|
.Ic wait_for_pids .
|
|
.It Sy restart
|
|
Runs the
|
|
.Sy stop
|
|
method, then the
|
|
.Sy start
|
|
method.
|
|
.It Sy status
|
|
Show the PID of
|
|
.Sy command ,
|
|
or some other script specific status operation.
|
|
.It Sy poll
|
|
Wait for
|
|
.Sy command
|
|
to exit.
|
|
.It Sy rcvar
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|
Display which
|
|
.Xr rc.conf 5
|
|
variable is used (if any).
|
|
This method always works, even if the appropriate
|
|
.Xr rc.conf 5
|
|
variable is set to
|
|
.Sq NO .
|
|
.El
|
|
.It Ic run_rc_script Ar file Ar arg
|
|
Start the script
|
|
.Ar file
|
|
with an argument of
|
|
.Ar arg ,
|
|
and handle the return value from the script.
|
|
.Pp
|
|
Various shell variables are unset before
|
|
.Ar file
|
|
is started:
|
|
.Bd -ragged -offset indent
|
|
.Li name ,
|
|
.Li command ,
|
|
.Li command_args ,
|
|
.Li extra_commands ,
|
|
.Li pidfile ,
|
|
.Li rcvar ,
|
|
.Li required_dirs ,
|
|
.Li required_files ,
|
|
.Li required_vars ,
|
|
.Li Ar arg Ns _cmd ,
|
|
.Li Ar arg Ns _precmd .
|
|
.Ed
|
|
.Pp
|
|
The startup behaviour of
|
|
.Ar file
|
|
depends upon the following checks:
|
|
.Bl -enum
|
|
.It
|
|
If
|
|
.Ar file
|
|
ends in
|
|
.Pa .sh ,
|
|
it is sourced into the current shell.
|
|
.It
|
|
If
|
|
.Ar file
|
|
appears to be a backup or scratch file
|
|
(e.g., with a suffix of
|
|
.Sq ~ ,
|
|
.Sq # ,
|
|
.Sq .OLD ,
|
|
or
|
|
.Sq .orig ) ,
|
|
ignore it.
|
|
.It
|
|
If
|
|
.Ar file
|
|
is not executable, ignore it.
|
|
.It
|
|
If the
|
|
.Xr rc.conf 5
|
|
variable
|
|
.Sy rc_fast_and_loose
|
|
is empty,
|
|
source
|
|
.Ar file
|
|
in a sub shell,
|
|
otherwise source
|
|
.Ar file
|
|
into the current shell.
|
|
.El
|
|
.It Ic wait_for_pids Op Ar pid Op Ar ...
|
|
Wait until all of the provided
|
|
.Ar pids
|
|
don't exist any more, printing the list of outstanding
|
|
.Ar pids
|
|
every two seconds.
|
|
.It Ic warn Ar message
|
|
Display a warning message to
|
|
.Em stderr
|
|
and log it to the system log
|
|
using
|
|
.Xr logger 1 .
|
|
The warning message consists of the script name
|
|
(from
|
|
.Va $0 ) ,
|
|
followed by
|
|
.Dq ": WARNING: " ,
|
|
and then
|
|
.Ar message .
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width /etc/rc.subr -compact
|
|
.It Pa /etc/rc.subr
|
|
The
|
|
.Nm
|
|
file resides in
|
|
.Pa /etc .
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr rc.conf 5 ,
|
|
.Xr rc 8
|
|
.Sh HISTORY
|
|
.Nm
|
|
appeared in
|
|
.Nx 1.3 .
|
|
The
|
|
.Xr rc.d 8
|
|
support functions appeared in
|
|
.Nx 1.5 .
|