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#!/bin/sh
# -*- indent-tabs-mode: nil; sh-indentation: 4 -*-
#
# Copyright(C) 2012-2013 Brazil
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
prefix=@prefix@
SERVICE_NAME=groonga-httpd
GROONGA_HTTPD=${SERVICE_NAME}
PID_FILE=@localstatedir@/run/groonga/${GROONGA_HTTPD}.pid
TIMEOUT=3
# Source configuration.
if [ -f /etc/default/${SERVICE_NAME} ]; then
. /etc/default/${SERVICE_NAME}
elif [ -f /etc/sysconfig/${SERVICE_NAME} ]; then
. /etc/sysconfig/${SERVICE_NAME}
fi
OLD_PID_FILE=${PID_FILE}.oldbin
wait_until () {
for n in $(seq ${TIMEOUT}); do
if "$@"; then
return 0
fi
sleep 1
done
return 1
}
wait_while () {
for n in $(seq ${TIMEOUT}); do
if ! "$@"; then
return 0
fi
sleep 1
done
return 1
}
start_master () {
local pid=$1
kill -USR2 ${pid}
}
switch_worker () {
local pid=$1
kill -WINCH ${pid}
}
stop_master () {
local pid=$1
kill -QUIT ${pid}
}
if [ ! -f "${PID_FILE}" ]; then
echo "PID file isn't found. groonga-httpd may not be running: <${PID_FILE}>"
exit 1
fi
OLD_PID=$(cat ${PID_FILE})
start_master ${OLD_PID}
if ! wait_until [ -f ${OLD_PID_FILE} ]; then
echo "Failed to create old PID file: <${PID_FILE}>"
exit 1
fi
if ! wait_until [ -f ${PID_FILE} ]; then
echo "Failed to start new groonga-httpd master."
exit 1
fi
NEW_PID=$(cat ${PID_FILE})
OLD_WORKER_PROCESSES=$(pgrep -P ${OLD_PID} | grep -v ${NEW_PID})
switch_worker ${OLD_PID}
for pid in ${OLD_WORKER_PROCESSES}; do
wait_while ps --pid=${pid} > /dev/null
done
OLD_WORKER_PROCESSES=$(pgrep -P ${OLD_PID} | grep -v ${NEW_PID})
if [ -n "${OLD_WORKER_PROCESSES}" ]; then
echo "Failed to stop old groonga-httpd worker process."
stop_master ${NEW_PID}
echo "Rollback to old groonga-httpd master."
exit 2
fi
stop_master ${OLD_PID}
exit $?
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