Add a skeleton for init scripts
Add a skeleton for init scripts, the original structure is from /etc/init.d/skeleton of Ubuntu 10.10, it is in sysvinit_2.87dsf, so add the COPYRIGHT(GPLv2) of sysvinit_2.87dsf. Modified the original skeleton a lot to make it as easy as possible, just use posix shell command, and have tested it with core-image-minimal. * The skeleton implements the following actions: - start, stop, restart, status, try-restart and force-reload. # force-reload is a alias of try-restart. - not implements reload, since only a few programs have it, just leave it as placeholder. * Add /usr/sbin/skeleton-test to test /etc/init.d/skeleton * The /etc/init.d/skeleton can be run and output the example messages: 1) #./skeleton start (test start) Starting skeleton ... 2) #./skeleton start (test start again when running) skeleton already running (1078). 3) #./skeleton status (test status when running) skeleton is running (1078). 4) #./skeleton stop (test stop) Stopped skeleton (1078). 5) #./skeleton stop (test stop again) skeleton is not running; none killed. 6) #./skeleton status (test status when stopped) skeleton is not running. 7) #./skeleton restart (test restart when running) Stopped skeleton (1128). Starting skeleton ... 8) #./skeleton restart (test restart when stopped) skeleton is not running; none killed. Starting skeleton ... 9) try-restart (or force-reload) means restart the service if the service is already running #./skeleton try-restart (test try-restart when stopped) skeleton is not running; none killed. #./skeleton try-restart (test try-restart when running) Stopped skeleton (1181). Starting skeleton ... * Have used syslogd to test it in a real world(with both core-image-minimal and core-image-sato) (From OE-Core rev: c1b6f840ad7c483e905f9a19eb2b5a8eac0b9973) Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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Sysvinit is Copyright (C) 1991-2004 Miquel van Smoorenburg
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#! /bin/sh
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### BEGIN INIT INFO
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# Provides: skeleton
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# Required-Start: $local_fs
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# Should-Start:
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# Required-Stop: $local_fs
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# Should-Stop:
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# Default-Start: 2 3 4 5
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# Default-Stop: 0 1 6
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# Short-Description: Example initscript
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# Description: This file should be used to construct scripts to be
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# placed in /etc/init.d
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### END INIT INFO
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# The definition of actions: (From LSB 3.1.0)
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# start start the service
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# stop stop the service
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# restart stop and restart the service if the service is already running,
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# otherwise start the service
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# try-restart restart the service if the service is already running
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# reload cause the configuration of the service to be reloaded without
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# actually stopping and restarting the service
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# force-reload cause the configuration to be reloaded if the service supports
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# this, otherwise restart the service if it is running
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# status print the current status of the service
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# The start, stop, restart, force-reload, and status actions shall be supported
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# by all init scripts; the reload and the try-restart actions are optional
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# Common steps to convert this skeleton into a real init script
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# 1) cp skeleton <the_real_name>
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# 2) Set DESC and NAME
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# 3) Check whether the daemon app is /usr/sbin/$NAME, if not, set it.
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# 4) Set DAEMON_ARGS if there is any
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# 5) Remove the useless code
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# NOTE: The skeleton doesn't support the daemon which is a script unless the
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# pidof supports "-x" option, please see more comments for pidofproc ()
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# in /etc/init.d/functions
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# PATH should only include /usr/* if it runs after the mountnfs.sh script
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PATH=/sbin:/usr/sbin:/bin:/usr/bin
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DESC="skeleton"
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NAME="skeleton-test"
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DAEMON=/usr/sbin/$NAME
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DAEMON_ARGS=""
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PIDFILE=/var/run/$NAME.pid
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. /etc/init.d/functions || exit 1
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# Exit if the package is not installed
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[ -x "$DAEMON" ] || exit 0
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# Read configuration variable file if it is present
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[ -r /etc/default/$NAME ] && . /etc/default/$NAME
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#
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# Function that starts the daemon/service
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#
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do_start() {
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local status pid
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status=0
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pid=`pidofproc $NAME` || status=$?
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case $status in
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0)
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echo "$DESC already running ($pid)."
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exit 1
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;;
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*)
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echo "Starting $DESC ..."
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exec $DAEMON $DAEMON_ARGS >/dev/null 2>&1 || status=$?
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echo "ERROR: Failed to start $DESC."
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exit $status
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;;
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esac
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# Add code here, if necessary, that waits for the process to be ready
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# to handle requests from services started subsequently which depend
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# on this one. As a last resort, sleep for some time.
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}
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#
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# Function that stops the daemon/service
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#
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do_stop() {
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local pid status
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status=0
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pid=`pidofproc $NAME` || status=$?
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case $status in
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0)
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# Exit when fail to stop, the kill would complain when fail
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kill -s 15 $pid >/dev/null && rm -f $PIDFILE && \
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echo "Stopped $DESC ($pid)." || exit $?
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;;
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*)
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echo "$DESC is not running; none killed." >&2
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;;
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esac
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# Wait for children to finish too if this is a daemon that forks
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# and if the daemon is only ever run from this initscript.
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# If the above conditions are not satisfied then add some other code
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# that waits for the process to drop all resources that could be
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# needed by services started subsequently. A last resort is to
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# sleep for some time.
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return $status
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}
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#
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# Function that sends a SIGHUP to the daemon/service
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#
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do_reload() {
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local pid status
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status=0
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# If the daemon can reload its configuration without
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# restarting (for example, when it is sent a SIGHUP),
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# then implement that here.
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pid=`pidofproc $NAME` || status=$?
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case $status in
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0)
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echo "Reloading $DESC ..."
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kill -s 1 $pid || exit $?
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;;
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*)
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echo "$DESC is not running; none reloaded." >&2
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;;
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esac
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exit $status
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}
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#
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# Function that shows the daemon/service status
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#
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status_of_proc () {
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local pid status
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status=0
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# pidof output null when no program is running, so no "2>/dev/null".
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pid=`pidofproc $NAME` || status=$?
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case $status in
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0)
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echo "$DESC is running ($pid)."
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exit 0
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;;
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*)
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echo "$DESC is not running." >&2
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exit $status
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;;
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esac
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}
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case "$1" in
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start)
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do_start
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;;
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stop)
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do_stop || exit $?
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;;
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status)
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status_of_proc
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;;
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restart)
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# Always start the service regardless the status of do_stop
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do_stop
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do_start
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;;
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try-restart|force-reload)
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# force-reload is the same as reload or try-restart according
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# to its definition, the reload is not implemented here, so
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# force-reload is the alias of try-restart here, but it should
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# be the alias of reload if reload is implemented.
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#
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# Only start the service when do_stop succeeds
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do_stop && do_start
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;;
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#reload)
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# If the "reload" action is implemented properly, then let the
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# force-reload be the alias of reload, and remove it from
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# try-restart|force-reload)
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#
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#do_reload
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#;;
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*)
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echo "Usage: $0 {start|stop|status|restart|try-restart|force-reload}" >&2
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exit 3
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;;
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esac
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#include <unistd.h>
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/* This demo does nothing except for testing /etc/init.d/skeleton */
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int main(int argc, char *argv[])
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{
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daemon(0, 0);
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while (1) {
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sleep(1);
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}
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return 0;
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}
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DESCRIPTION = "The canonical example of init scripts"
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SECTION = "base"
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LICENSE = "GPLv2"
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LIC_FILES_CHKSUM = "file://${WORKDIR}/COPYRIGHT;md5=349c872e0066155e1818b786938876a4"
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RDEPENDS_${PN} = "initscripts"
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PR = "r0"
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SRC_URI = "file://skeleton \
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file://skeleton_test.c \
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file://COPYRIGHT \
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"
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CONFFILES_${PN} += "${sysconfdir}/init.d/skeleton"
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do_compile () {
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${CC} ${WORKDIR}/skeleton_test.c -o ${WORKDIR}/skeleton-test
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}
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do_install () {
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install -d ${D}${sysconfdir}/init.d
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cat ${WORKDIR}/skeleton | \
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sed -e 's,/etc,${sysconfdir},g' \
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-e 's,/usr/sbin,${sbindir},g' \
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-e 's,/var,${localstatedir},g' \
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-e 's,/usr/bin,${bindir},g' \
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-e 's,/usr,${prefix},g' > ${D}${sysconfdir}/init.d/skeleton
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chmod a+x ${D}${sysconfdir}/init.d/skeleton
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install -d ${D}${sbindir}
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install -m 0755 ${WORKDIR}/skeleton-test ${D}${sbindir}/
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}
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