Startup checker

gistfile1.sh

#!/bin/bash

. /etc/init.d/functions

LOGFILE=/tmp/tmp.log
KEYWORD=Started
CHECK_INTERVAL=5
TIMEOUT=30
TIME_COMMAND='date +%s'

if [ ! -f ${LOGFILE} ]; then
    echo "ERROR: ${LOGFILE} does not exist" >&2
    exit 1
fi

tail -0f ${LOGFILE} 2>/dev/null | grep -m1 ${KEYWORD} >/dev/null 2>&1 &

TAIL_PID=$(pgrep -P $$ tail)
GREP_PID=$(pgrep -P $$ grep)

function kill_process {
    declare -i pid=$1
    declare name=$2

    if ! ps -p ${pid} >/dev/null 2>&1; then
        return 0
    fi

    kill -KILL ${pid} >/dev/null 2>&1

    if ! ps -p ${pid} >/dev/null 2>&1; then
        failure
        echo
        echo "ERROR: killing ${name} (pid=${pid}) faield" >&2
        return 1
    fi

    return 0
}

function kill_grep {
    kill_process ${GREP_PID} grep
    return $?
}

function kill_tail {
    kill_process ${TAIL_PID} tail
    return $?
}

echo "Waiting for ${LOGFILE}... "

START_TIME=$(${TIME_COMMAND})
while :; do
    CURRENT_TIME=$(${TIME_COMMAND})

    # grep が終了しているかどうかをチェック
    if ! ps -p ${GREP_PID} >/dev/null 2>&1; then
        kill_tail
        if [ $? -eq 0 ]; then
            success
            echo
        fi

        break
    else
        TIME_ELAPSED=$((${CURRENT_TIME} - ${START_TIME}))
        if [ ${TIME_ELAPSED} -ge ${TIMEOUT} ]; then
            kill_grep
            kill_tail
            echo "ERROR: Timed out" >&2
            break
        fi
    fi

    sleep ${CHECK_INTERVAL}
done