cert-nginx.init

#!/bin/bash
# description: cert-nginx

set -o pipefail

script_name=`basename "$0"`
script_abs_name=`readlink -f "$0"`
script_path=`dirname "$script_abs_name"`

# get nginx
which nginx >/dev/null
if [ $? -ne 0 ]
then
    echo "nginx not installed"
    exit 1
fi

desc=cert-nginx
prog=nginx
pid_file=$script_path/work/${desc}.pid
work_dir=$script_path/work/
config_file=$script_path/cert-nginx.conf
args=(-c "$config_file" -p "$work_dir")
wait_tick=0.1
wait_tick_count=500

usage()
{
    printf "usage: $script_name [start|stop|restart|status]\n"
    exit 1
}

show_error()
{
    local message=$1
    printf "\033[;31m%s\033[0m\n" "$message"
}

show_success()
{
    local message=$1
    printf "\033[;32m%s\033[0m\n" "$message"
}

do_start()
{
    local i

    printf "[starting $desc]"

    pid=`cat "$pid_file" 2>/dev/null`
    if [ $? -eq 0 ]
    then
        kill -0 "$pid" 2>/dev/null
        if [ $? -eq 0 ]
        then
            show_error '[already started]'
            return 1
        fi
    fi

    "$prog" "${args[@]}"

    for (( i = 0; i < "$wait_tick_count"; ++i ))
    do
        pid=`cat "$pid_file" 2>/dev/null`
        if [ $? -eq 0 ]
        then
            kill -0 "$pid" 2>/dev/null
            if [ $? -eq 0 ]
            then
                show_success '[success]'
                return 0
            fi
        fi
        sleep "$wait_tick"
    done

    show_error '[failed]'
    return 1
}

do_stop()
{
    local i

    printf "[stopping $desc]"

    pid=`cat "$pid_file" 2>/dev/null`
    if [ $? -ne 0 ]
    then
        show_error '[not started]'
        return 1
    fi

    kill -0 "$pid" 2>/dev/null
    if [ $? -ne 0 ]
    then
        show_error '[not started]'
        return 1
    fi

    kill "$pid"

    for (( i = 0; i < "$wait_tick_count"; ++i ))
    do
        kill -0 "$pid" 2>/dev/null
        if [ $? -ne 0 ]
        then
            show_success '[success]'
            return 0
        fi
        sleep "$wait_tick"
    done

    show_error '[failed]'
    return 1
}

do_status()
{
    printf "[$desc]"

    pid=`cat "$pid_file" 2>/dev/null`
    if [ $? -ne 0 ]
    then
        show_error '[stopped]'
        return 0
    fi

    kill -0 "$pid" 2>/dev/null
    if [ $? -ne 0 ]
    then
        show_error '[stopped]'
    else
        show_success '[running]'
    fi

    return 0
}

# main
if [ $# -ne 1 ]
then
    usage
fi

# check config file exist
if [ ! -f "$config_file" ]
then
    echo "config file: $config_file not found"
    exit 1
fi

case "$1" in
    start)
        do_start
        ;;
    stop)
        do_stop
        ;;
    restart)
        do_stop
        do_start
        ;;
    status)
        do_status
        ;;
    *)
        usage
        ;;
esac

exit 0