506 lines
12 KiB
Plaintext
506 lines
12 KiB
Plaintext
# $NetBSD: rc.subr,v 1.19 2000/05/13 08:23:45 lukem Exp $
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#
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# Copyright (c) 1997-2000 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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# rc.subr
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# functions used by various rc scripts
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#
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#
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# functions
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# ---------
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#
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# checkyesno var
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# Test $1 variable, and warn if not set to YES or NO.
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# Return 0 if it's "yes" (et al), nonzero otherwise.
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#
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checkyesno()
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{
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eval _value=\$${1}
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case $_value in
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# "yes", "true", "on", or "1"
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[Yy][Ee][Ss]|[Tt][Rr][Uu][Ee]|[Oo][Nn]|1)
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return 0
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;;
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# "no", "false", "off", or "0"
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[Nn][Oo]|[Ff][Aa][Ll][Ss][Ee]|[Oo][Ff][Ff]|0)
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return 1
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;;
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*)
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warn "\$${1} is not set properly."
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return 1
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;;
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esac
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}
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#
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# mount_critical_filesystems
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# Go through the list of critical filesystems, checking each one
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# to see if it is mounted, and if it is not, mounting it.
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#
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mount_critical_filesystems()
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{
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if [ $1 = local ]; then
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_fslist=$critical_filesystems_beforenet
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else
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_fslist=$critical_filesystems
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fi
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for _fs in $_fslist; do
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mount | (
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_ismounted=no
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while read what _on on _type type; do
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if [ $on = $_fs ]; then
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_ismounted=yes
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fi
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done
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if [ $_ismounted = no ]; then
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mount $_fs >/dev/null 2>&1
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fi
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)
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done
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}
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#
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# check_pidfile pidfile procname
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# Parses the first line of pidfile for a pid, and ensures
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# that the process is running and matches procname.
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# Prints the matching pid upon success, nothing otherwise.
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#
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check_pidfile()
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{
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_pidfile=$1
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_procname=$2
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if [ -z "$_pidfile" -o -z "$_procname" ]; then
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err 3 'USAGE: check_pidfile pidfile procname'
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fi
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if [ ! -f $_pidfile ]; then
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return
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fi
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read _pid _junk < $_pidfile
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if [ -z "$_pid" ]; then
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return
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fi
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_procnamebn=`basename $_procname`
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ps -p $_pid -o 'pid,command' | while read _npid _arg0 _argv; do
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if [ "$_npid" = "PID" ]; then
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continue
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fi
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if [ "$_arg0" = "$_procname" \
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-o "$_arg0" = "$_procnamebn" \
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-o "$_arg0" = "${_procnamebn}:" \
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-o "$_arg0" = "(${_procnamebn})" ]; then
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echo $_npid
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return
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fi
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done
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}
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#
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# check_process procname
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# Ensures that a process (or processes) named procname is running.
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# Prints a list of matching pids.
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#
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check_process()
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{
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_procname=$1
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if [ -z "$_procname" ]; then
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err 3 'USAGE: check_process procname'
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fi
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_procnamebn=`basename $_procname`
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_pref=
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ps -ax -o 'pid,command' | while read _npid _arg0 _argv; do
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if [ "$_npid" = "PID" ]; then
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continue
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fi
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if [ "$_arg0" = "$_procname" \
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-o "$_arg0" = "$_procnamebn" \
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-o "$_arg0" = "${_procnamebn}:" \
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-o "$_arg0" = "(${_procnamebn})" ]; then
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echo -n "$_pref$_npid"
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_pref=" "
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fi
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done
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}
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#
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# run_rc_command arg
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# Search for arg in the list of supported commands, which is:
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# "start stop restart rcvar status ${extra_commands}"
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# If there's a match, run ${arg}_cmd or the default command (see below).
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#
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# If arg has a given prefix, then change the operation as follows:
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# prefix operation
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# ------ ---------
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# fast Skip the pid check.
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# force Set ${rcvar} to YES.
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#
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# The following globals are used:
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# name needed function
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# ---- ------ --------
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# name y Name of script.
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# command n Full path to command.
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# Not needed if ${arg}_cmd is set for
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# each keyword.
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# command_args n Optional args/shell directives for command.
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# extra_commands n List of extra commands supported.
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# pidfile n If set, use check_pidfile $pidfile, else if
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# $command is set, use check_process $command.
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# rcvar n If the default command is being run, this is
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# checked with checkyesno to determine if
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# the action should be run.
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# If this variable isn't set, ${name} is checked
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# instead.
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# ${name}_chdir n Directory to cd to before running ${command}.
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# ${name}_flags n Arguments to call ${command} with.
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# NOTE: if $flags is set (e.g, from the parent
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# environment), it overrides this.
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# ${name}_nice n Nice level to run ${command} at.
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# ${name}_user n User to run ${command} as.
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# ${_arg}_cmd n If set, use this as the action when invoked;
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# $_arg is available to the action to use.
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# Otherwise, use default command (see below)
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# NOTE: checkyesno ${rcvar} is NOT performed
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# for ${_arg}_cmd; use ${_arg}_precmd to
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# do this.
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# ${_arg}_precmd n If set, run just before performing the main
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# action in the default command (i.e, after
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# checking for required bits and process
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# (non)existance).
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# If this completes with a non-zero exit code,
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# don't run ${_arg}_cmd.
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# required_dirs n If set, check for the existence of the given
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# directories before running the default
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# (re)start command.
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# required_files n If set, check for the readability of the given
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# files before running the default (re)start
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# command.
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# required_vars n If set, perform checkyesno on each of the
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# listed variables before running the default
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# (re)start command.
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#
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# Default commands for a given arg:
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# arg default
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# --- -------
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# status Show if ${command} is running, etc.
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# start if !running && checkyesno ${rcvar}
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# ${command}
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# stop if ${pidfile}
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# kill $sig_stop `check_pidfile $pidfile`
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# else
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# kill $sig_stop `check_process $command`
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# $sig_stop defaults to TERM.
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# reload As stop, except use $sig_reload instead.
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# $sig_reload defaults to HUP.
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# restart Run `stop' then `start'.
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#
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run_rc_command()
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{
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_arg=$1
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_ckvar=${rcvar:-$name}
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if [ -z "$_ckvar" ]; then
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err 3 'neither $rcvar or $name is set.'
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fi
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case "$_arg" in
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fast*)
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_arg=${_arg#fast}
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_rc_fast_run=YES
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;;
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force*)
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_arg=${_arg#force}
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eval ${_ckvar}=YES
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;;
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esac
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_keywords="start stop restart rcvar $extra_commands"
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_pid=
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_pidcmd=
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if [ -z "$_rc_fast_run" ]; then
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if [ -n "$pidfile" ]; then
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_pidcmd='_pid=`check_pidfile '$pidfile' '$command'`'
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elif [ -n "$command" ]; then
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_pidcmd='_pid=`check_process '$command'`'
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fi
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if [ -n "$_pidcmd" ]; then
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_keywords="${_keywords} status"
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fi
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fi
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if [ -z "$_arg" ]; then
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rc_usage "$_keywords"
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fi
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if [ -n "$flags" ]; then # allow override from environment
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_flags=$flags
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else
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eval _flags=\$${name}_flags
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fi
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eval _chdir=\$${name}_chdir
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eval _nice=\$${name}_nice
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eval _user=\$${name}_user
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eval $_pidcmd
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for _elem in $_keywords; do
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if [ "$_elem" != "$_arg" ]; then
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continue
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fi
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eval _cmd=\$${_arg}_cmd
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eval _precmd=\$${_arg}_precmd
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if [ -n "$_cmd" ]; then
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eval $_precmd || return 1
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eval $_cmd
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return 0
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fi
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case "$_arg" in
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status)
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if [ -n "$_pid" ]; then
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echo "${name} is running as pid $_pid."
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else
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echo "${name} is not running."
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fi
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;;
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start)
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if [ -n "$_pid" ]; then
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echo "${name} already running? (pid=$_pid)."
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exit 1
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fi
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if ! checkyesno ${_ckvar} || [ ! -x $command ]; then
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return 0
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fi
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for _f in $required_vars; do
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if ! checkyesno $_f; then
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warn \
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"\$${_f} is not set; ${name} not started."
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return 1
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fi
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done
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for _f in $required_dirs; do
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if [ ! -d "${_f}/." ]; then
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warn \
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"${_f} is not a directory; ${name} not started."
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return 1
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fi
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done
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for _f in $required_files; do
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if [ ! -r "${_f}" ]; then
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warn \
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"${_f} is not readable; ${name} not started."
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return 1
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fi
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done
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eval $_precmd || return 1
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echo "Starting ${name}."
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_doit="\
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${_user:+su -m $_user -c 'sh -c \"}\
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${_chdir:+cd $_chdir; }\
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${_nice:+nice -n $_nice }\
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$command $_flags $command_args\
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${_user:+\"'}"
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eval $_doit
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;;
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stop)
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if [ -z "$_pid" ]; then
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if checkyesno ${_ckvar}; then
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if [ -n "$pidfile" ]; then
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echo \
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"${name} not running? (check $pidfile)."
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else
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echo "${name} not running?"
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fi
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exit 1
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fi
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return 0
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fi
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eval $_precmd || return 1
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echo "Stopping ${name}."
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_doit=\
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"${_user:+su -m $_user -c '}kill -${sig_stop:-TERM} $_pid${_user:+'}"
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eval $_doit
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;;
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reload)
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if [ -z "$_pid" ]; then
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if checkyesno ${_ckvar}; then
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if [ -n "$pidfile" ]; then
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echo \
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"${name} not running? (check $pidfile)."
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else
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echo "${name} not running?"
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fi
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exit 1
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fi
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return 0
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fi
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echo "Reloading ${name} config files."
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eval $_precmd || return 1
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_doit=\
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"${_user:+su -m $_user -c '}kill -${sig_reload:-HUP} $_pid${_user:+'}"
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eval $_doit
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;;
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restart)
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if ! checkyesno ${_ckvar}; then
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return 0
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fi
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eval $_precmd || return 1
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( $0 stop )
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sleep 1
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$0 start
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;;
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rcvar)
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echo "# $name"
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if checkyesno ${_ckvar}; then
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echo "\$${_ckvar}=YES"
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else
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echo "\$${_ckvar}=NO"
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fi
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;;
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*)
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rc_usage "$_keywords"
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;;
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esac
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return 0
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done
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echo 1>&2 "$0: unknown directive '$_arg'."
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rc_usage "$_keywords"
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exit 1
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}
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#
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# run_rc_script file arg
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# Start the script `file' with `arg', and correctly handle the
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# return value from the script. If `file' ends with `.sh', it's
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# sourced into the current environment. Otherwise it's run as
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# a child process.
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#
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# Note: because `.sh' files are sourced into the current environment
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# run_rc_command shouldn't be used because its difficult to ensure
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# that the global variable state before and after the sourcing of
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# the .sh file won't adversely affect other scripts.
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#
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run_rc_script()
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{
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_file=$1
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_arg=$2
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if [ -z "$_file" -o -z "$_arg" ]; then
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err 3 'USAGE: run_rc_script file arg'
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fi
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case "$_file" in
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*.sh) # run in current shell
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set $_arg ; . $_file
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;;
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*) # run in subshell
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( set $_arg ; . $_file )
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;;
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esac
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}
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#
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# load_rc_config
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# Source in the configuration file for a given command.
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# Currently just uses /etc/rc.conf.
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#
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load_rc_config()
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{
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_command=$1
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if [ -z "$_command" ]; then
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err 3 'USAGE: load_rc_config command'
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fi
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. /etc/rc.conf
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}
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#
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# rc_usage commands
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# Print a usage string for $0, with `commands' being a list of
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# valid commands.
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#
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rc_usage()
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{
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echo -n 1>&2 "Usage: $0 [fast|force]("
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_sep=
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for _elem in $*; do
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echo -n 1>&2 "$_sep$_elem"
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_sep="|"
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done
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echo 1>&2 ")"
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exit 1
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}
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#
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# err exitval message
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# Display message to stderr and log to the syslog, and exit with exitval.
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#
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err()
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{
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exitval=$1
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shift
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logger "$0: ERROR $*"
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echo 1>&2 "$0: ERROR $*"
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exit $exitval
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}
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#
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# warn message
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# Display message to stderr and log to the syslog.
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#
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warn()
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{
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logger "$0: WARNING $*"
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echo 1>&2 "$0: WARNING $*"
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}
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