否则,正常运行的代码将无法在systemd

时间:2018-06-16 17:38:02

标签: python raspberry-pi systemd debian-stretch

我身边的另一个新手问题:) 我试着查一下,但在这种情况下我找不到任何有意义的东西。 我有这个代码在正常情况下工作正常。

import automationhat
import bluetooth
import time
import sys
import telegram

bot = telegram.Bot(token='56915444444:AAEzP5jy-pMD3ZME0twxY5bXkxxxxxxxxxxxxxxxxxxd_U')


# Import Adafruit IO MQTT client.
from Adafruit_IO import MQTTClient


ADAFRUIT_IO_KEY      = '73c755488accccccc361a506f700000002ba'
ADAFRUIT_IO_USERNAME = 'flxxxxxxxx'


def connected(client):
    print('Connected to Adafruit IO!  Listening for LockReg changes...')
    # Subscribe to changes on a feed named LockReg.
    client.subscribe('LockReg')

def disconnected(client):
    print('Disconnected from Adafruit IO!')
    sys.exit(1)

def message(client, feed_id, payload, retain):
    print('Feed {0} received new value: {1}'.format(feed_id, payload))

client = MQTTClient(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)

# Setup the callback functions defined above.
client.on_connect    = connected
client.on_disconnect = disconnected
client.on_message    = message

PHONES = ['B0:xx:2D:x0:C9:xx', 'xx:8D:08:xx:C3:7C', 'xx:AB:37:EA:93:xx']

while True:

        print "Checking " + time.strftime("%a, %d %b %Y %H:%M:%S", time.gmtime())

        for device in PHONES:
                result = bluetooth.lookup_name(device, timeout=5)
                if (result != None):
                    # Connect to the Adafruit IO server.
            client.connect()
            print('Door unlocked. Nearby: %s (%s)' % (result, device))
                        client.publish('lock.reg', result)
                        automationhat.relay.one.on()
                        time.sleep(2)
                        automationhat.relay.one.off()
            bot.sendMessage(-26934xxxxx, result)
                        time.sleep(180)
                else:
                        print "User out of range"
                        print('Door locked: No Bluetooth device detected. ' )
        time.sleep(10)

我的systemd lock.service文件如下所示:

[Unit]
 Description=My Lock  Service
 After=multi-user.target

 [Service]
 Type=idle
 ExecStart=/usr/bin/python /home/pi/lockreg.py > /home/pi/lock.log 2>&1

 [Install]
 WantedBy=multi-user.target

但是如果在初始启动时从systemd执行,我会收到以下错误消息:

pi@raspberrypi:~ $ systemctl status lock.service
● lock.service - My Lock  Service
   Loaded: loaded (/lib/systemd/system/lock.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sat 2018-06-16 18:33:32 CEST; 29min ago
  Process: 492 ExecStart=/usr/bin/python /home/pi/lockreg.py > /home/pi/lock.log 2>&1 (
 Main PID: 492 (code=exited, status=1/FAILURE)

Jun 16 18:33:29 raspberrypi systemd[1]: Started My Lock  Service.
Jun 16 18:33:32 raspberrypi python[492]: Traceback (most recent call last):
Jun 16 18:33:32 raspberrypi python[492]:   File "/home/pi/lockreg.py", line 11, in <mod
Jun 16 18:33:32 raspberrypi python[492]:     import telegram
Jun 16 18:33:32 raspberrypi python[492]: ImportError: No module named telegram
Jun 16 18:33:32 raspberrypi systemd[1]: lock.service: Main process exited, code=exited,
Jun 16 18:33:32 raspberrypi systemd[1]: lock.service: Unit entered failed state.
Jun 16 18:33:32 raspberrypi systemd[1]: lock.service: Failed with result 'exit-code'.

从systemd执行时,以某种方式无法访问Telegram模块。为什么呢?

感谢您的一些提示 P上。

1 个答案:

答案 0 :(得分:1)

有几种可能的错误。

可能只为用户telegram安装pi,而不是为所有用户全局安装/home/pi/.local/。检查site-packages以查看是否可以在那里找到电报。

如果没有,您可能希望将模块安装在系统范围的> python Python 2.7.15 (default, May 11 2018, 15:54:10) Type "help", "copyright", "credits" or "license" for more information. >>> import sys >>> [p for p in sys.path if p.endswith('site-packages')] ['/usr/local/lib/python2.7/site-packages'] >>> 目录中。使用以下内容查找:

python

(它可能是一个不同的目录,因为我的/usr/local/bin住在telegram。)

然后检查site-packages是否作为site-packages目录中的文件或子目录安装。

它也可能是权限问题。 Systemd将您的程序作为特定用户ID运行。检查该特定用户是否可以读取telegram目录和Systemd子目录。

编辑: root可以在两种模式下运行; 系统用户。只有后者作为特定用户运行。我猜这个系统模式运行为lock.service。从pi文件的位置,我收集到您正在系统模式下使用systemd。根据您的意见,电报仅为用户python安装 。因此root正在运行telegram 不应该看到它,这正是您所体验的。

所以基本上你有两个选择:

  • 为所有用户安装root。 (以pi运行安装。)
  • 以用户LoadBalancer运行用户模式systemd。