Intel NUC HTPC怠速关机

Question

我正在运行英特尔Nuc上的HTPC，运行Xenial。当我按下电源按钮时，它会运行powerbtn.sh，这会启动关机，但我的覆盆子能够唤醒它，正如我所希望的那样。

问题是，在空闲5分钟时，如何使ubuntu运行。我关心的两个因素是，MythTV和ssh不应该在10分钟内服务。

我想我可以用这里的解决方案当SSH连接打开时，防止机器休眠阻止SSH

我认为操作系统应该自动考虑到MythTV。

但我该如何把所有这些都放在一起，让它发挥作用呢？

谢谢您抽时间见我!

编辑:经过深思熟虑，我想出了这个脚本，我计划每15分钟在cron上运行一次。如有任何建议，将不胜感激。

#!/bin/bash

#check for SSH sessions, and prevent suspending:
if [ "$(who | grep -cv "(:")" -gt 1 ]; then
    echo "SSH session(s) are on. Not suspending."
    exit 1
fi

#check for MythTV sessions, and preventing suspending:
if [ "$(netstat -tun | grep :6543 | grep -i established | wc -l)" -gt 0 ]; then
    echo "MythTV  is still streaming. Not suspending."
    exit 1
fi

sleep 5m

#check for SSH sessions, and prevent suspending:
if [ "$(who | grep -cv "(:")" -gt 1 ]; then
    echo "SSH session(s) are on. Not suspending."
    exit 1
fi

#check for MythTV sessions, and preventing suspending:
if [ "$(netstat -tun | grep :6543 | grep -i established | wc -l)" -gt 0 ]; then
    echo "MythTV  is still streaming. Not suspending."
    exit 1
fi

echo "Safe to shutdown from MythTV and SSH"
/etc/acpi/powerbtn.sh

Answer 1

我无法让MythTV系统事件工作。我尽了最大的努力利用权限，但都徒劳无功。这是我目前的工作代码。用设置替换数据库变量。如果有任何步骤失败程序将退出，请将其保存为/etc/cron.daily/idle_htpc.py。每隔15分钟sudo crontab -e一次

步骤1:查看是否有SSH连接

第二步:检查是否正在播放现场或录制的视频。如果不睡5分钟

第三步:再次检查是否正在播放现场或录制的视频

步骤4:检查在最后5分钟内是否有一个活动流，以防脚本在第2步休眠时有一个5分钟以下的流。但是，如果有记录的回放，这里就无法检测到。

第5步:检查下一个即将到来的录音，如果有，并且是>5分钟以后，设置ACPI唤醒，3分钟前开始和关闭，否则清除ACPI唤醒和关闭。

希望这能帮上忙。

#!/usr/bin/python3

import pymysql
import pymysql.cursors
from datetime import timedelta,datetime
import subprocess
import time
import sys

print ( datetime.now().strftime("%Y-%m-%d %H:%M:%S"), file=sys.stdout)

def check_Logins():
    #Returns the number of SSH connections
    #result= subprocess.run('who | grep -cv "(:"', stdout=subprocess.PIPE, shell=True)
    result= subprocess.run("netstat -n |grep tcp |grep ':22' |wc -l", stdout=subprocess.PIPE, shell=True)
    print ('Logins:'+result.stdout.decode('UTF-8'), file=sys.stdout)
    return (int(result.stdout.decode('UTF-8')))

def check_if_InUse():
    #Checks if a live stream or a previosuly recorded program is being served at this moment. If yes, non zero value is returned
    InUse=1
    connection = pymysql.connect(host=$host,
                             user=$username,
                             password=$password,
                             db=$db,
                             charset='utf8mb4',
                             cursorclass=pymysql.cursors.DictCursor)

    try:
        with connection.cursor() as cursor:
            # Read a single record
            sql = "select count(*) from inuseprograms where recusage !='jobqueue' and recusage !='flagger'"
            cursor.execute(sql)
            result = cursor.fetchone()
            InUse = result["count(*)"]
    finally:
        connection.close()
    print ("Count: "+str(InUse), file=sys.stdout)
    return InUse

def check_live_5min():
    #Checks if there were any live streams served in last 5 minutes
    RecInUse_5min=1
    connection = pymysql.connect(host=$host,
                             user=$username,
                             password=$password,
                             db=$db,
                             charset='utf8mb4',
                             cursorclass=pymysql.cursors.DictCursor)

    try:
        with connection.cursor() as cursor:
            # Read a single record
            sql = "select max(starttime) from recordedseek"
            cursor.execute(sql)
            result = cursor.fetchone()
            print ('Recent: ', result['max(starttime)'], file=sys.stdout)
            print ('Current: ',datetime.utcnow(), file=sys.stdout)
            if datetime.utcnow()-result['max(starttime)']>=timedelta(minutes=5):
                RecInUse_5min =0
    finally:
        connection.close()
    return RecInUse_5min

def get_next_rec():
    #Returns a tuple indicating if there is any scheduled recording if yes, how far into the future
    retdata = (True, timedelta(minutes=1))
    connection = pymysql.connect(host=$host,
                             user=$username,
                             password=$password,
                             db=$db,
                             charset='utf8mb4',
                             cursorclass=pymysql.cursors.DictCursor)

    try:
        with connection.cursor() as cursor:
            # Read a single record
            sql = "select MIN(next_record) from record where recordid!=1 and next_record IS NOT NULL;"
            cursor.execute(sql)
            result = cursor.fetchone()
            if result['MIN(next_record)'] is None: #no scheduled recordings
                retdata= (False,timedelta(minutes=1))
            else:
                retdata= (True,result['MIN(next_record)']-datetime.utcnow())
    finally:
       connection.close()
    return retdata

if check_Logins()==0:
    print ('First check passed', file=sys.stdout)

    if check_if_InUse() == 0:
        print ('Second check passed', file=sys.stdout)
        time.sleep(5*60)

        if check_if_InUse() == 0:
            print ('Third check passed', file=sys.stdout)
            if check_live_5min()==0:
                print ('Fourth check passed', file=sys.stdout)
                (valid,upcoming) = get_next_rec()

                # Clear any previously set wakeup time 
                result = subprocess.run('echo 0 > /sys/class/rtc/rtc0/wakealarm',stdout=subprocess.PIPE,shell=True)
                print ('Clear:'+result.stdout.decode('UTF-8'), file=sys.stdout)

                if valid is True:
                    # Generate wakeup time string
                    upcoming = upcoming - timedelta(minutes=3)
                    wakeup_string="'+"+str(upcoming.days)+" days + "+str(max([int(upcoming.seconds/60)-3,0]))+" minutes'"
                    print ('Setting for '+wakeup_string, file=sys.stdout)
                    wakeup_command="echo `date '+%s' -d " +wakeup_string+ "` > /sys/class/rtc/rtc0/wakealarm"
                    #Setup wakeup time
                    result = subprocess.run(wakeup_command,stderr=subprocess.PIPE, shell=True)
                    print ('Set:'+result.stderr.decode('UTF-8'), file=sys.stdout)
                    #Check if alarm is set. It should show the unix time stamp
                    result= subprocess.run('cat /sys/class/rtc/rtc0/wakealarm', stdout=subprocess.PIPE, shell=True)
                    print ('Check:'+result.stdout.decode('UTF-8'), file=sys.stdout)

                print ('Shutting down', file=sys.stdout)
                subprocess.Popen(['/sbin/shutdown', '-h', 'now'])