91 lines
3.2 KiB
Bash
91 lines
3.2 KiB
Bash
#!/bin/sh -T
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#
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#-
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# Copyright 2009 Thomas-Martin Seck. 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 providing 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 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 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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# gatling_wrapper {gatling|tlsgatling} [options]
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#
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# A simple wrapper script for gatling (or any other program that does not
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# daemonize itself and logs to stdout).
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#
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# This wrapper tries to emulate part of the functionality usually supplied
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# by software like daemontools or runit.
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# It can be used by a FreeBSD port rc.d script to start a program
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# that does not daemonize itself and logs to stdout/stderr. It redirects stdout
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# and stderr to logger(1) via a fifo.
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#
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# Note: We need a shell that can offer us asynchronous trap handling in order
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# to be able to abort the infinite loop from outside. FreeBSD's /bin/sh offers
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# the "-T" switch for this purpose.
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#
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# TODO: send fd 2 output to never-never land to get rid of "Terminated" when we
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# kill this script but provide a way for errx() to communicate with the outside
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# world via stderr.
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errx() {
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echo "${me}: $@" >&2
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exit 1
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}
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cleanup() {
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rm -rf ${tmpdir}
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rm -f ${pidfile}
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}
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PATH=/bin:/sbin:/usr/bin:/usr/sbin
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me=${0##*/}
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logger=/usr/bin/logger
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daemon_log_facility=daemon.notice
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self_log_facility=daemon.notice
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pidfile=/var/run/${me}.pid
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daemon_name=gatling
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daemon_program="$1"
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shift
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test -x "${daemon_program}" || errx "cannot execute ${daemon_program}!"
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test -x ${logger} || errx "cannot execute ${logger}!"
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test -f ${pidfile} && errx "${pidfile} is already present -- is another instance of ${me} running?"
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echo $$ >${pidfile} || errx "cannot write to ${pidfile}!"
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tmpdir=`mktemp -d /tmp/${me}.XXXXXXXXXX` || errx "cannot generate tmpdir!"
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logfifo=${tmpdir}/fifo
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mkfifo -m 0600 ${logfifo} || errx "cannot generate fifo!"
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while true; do
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trap 'break' 1 2 3 6 9 15
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${logger} -i -p ${daemon_log_facility} -t ${daemon_name} <${logfifo} &
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log_pid=$!
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"${daemon_program}" $@ >${logfifo} 2>&1 &
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daemon_pid=$!
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wait ${daemon_pid}
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${logger} -i -p ${self_log_facility} -t ${me} "${daemon_program} died -- restarting..."
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sleep 2
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done
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kill -TERM ${daemon_pid} 2>/dev/null
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wait
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cleanup
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